1
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Shamsuzzaman S, Deaton RA, Salamon A, Doviak H, Serbulea V, Milosek VM, Evans MA, Karnewar S, Saibaba S, Alencar GF, Shankman LS, Walsh K, Bekiranov S, Kocher O, Krieger M, Kull B, Persson M, Michaëlsson E, Bergenhem N, Heydarkhan-Hagvall S, Owens GK. Novel Mouse Model of Myocardial Infarction, Plaque Rupture, and Stroke Shows Improved Survival With Myeloperoxidase Inhibition. Circulation 2024; 150:687-705. [PMID: 38881440 PMCID: PMC11347105 DOI: 10.1161/circulationaha.123.067931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 05/22/2024] [Indexed: 06/18/2024]
Abstract
BACKGROUND Thromboembolic events, including myocardial infarction (MI) or stroke, caused by the rupture or erosion of unstable atherosclerotic plaques are the leading cause of death worldwide. Although most mouse models of atherosclerosis develop lesions in the aorta and carotid arteries, they do not develop advanced coronary artery lesions. Moreover, they do not undergo spontaneous plaque rupture with MI and stroke or do so at such a low frequency that they are not viable experimental models to study late-stage thrombotic events or to identify novel therapeutic approaches for treating atherosclerotic disease. This has stymied the development of more effective therapeutic approaches for reducing these events beyond what has been achieved with aggressive lipid lowering. Here, we describe a diet-inducible mouse model that develops widespread advanced atherosclerosis in coronary, brachiocephalic, and carotid arteries with plaque rupture, MI, and stroke. METHODS We characterized a novel mouse model with a C-terminal mutation in the scavenger receptor class B, type 1 (SR-BI), combined with Ldlr knockout (designated SR-BI∆CT/∆CT/Ldlr-/-). Mice were fed Western diet (WD) for 26 weeks and analyzed for MI and stroke. Coronary, brachiocephalic, and carotid arteries were analyzed for atherosclerotic lesions and indices of plaque stability. To validate the utility of this model, SR-BI∆CT/∆CT/Ldlr-/- mice were treated with the drug candidate AZM198, which inhibits myeloperoxidase, an enzyme produced by activated neutrophils that predicts rupture of human atherosclerotic lesions. RESULTS SR-BI∆CT/∆CT/Ldlr-/- mice show high (>80%) mortality rates after 26 weeks of WD feeding because of major adverse cardiovascular events, including spontaneous plaque rupture with MI and stroke. Moreover, WD-fed SR-BI∆CT/∆CT/Ldlr-/- mice displayed elevated circulating high-sensitivity cardiac troponin I and increased neutrophil extracellular trap formation within lesions compared with control mice. Treatment of WD-fed SR-BI∆CT/∆CT/Ldlr-/- mice with AZM198 showed remarkable benefits, including >90% improvement in survival and >60% decrease in the incidence of plaque rupture, MI, and stroke, in conjunction with decreased circulating high-sensitivity cardiac troponin I and reduced neutrophil extracellular trap formation within lesions. CONCLUSIONS WD-fed SR-BI∆CT/∆CT/Ldlr-/- mice more closely replicate late-stage clinical events of advanced human atherosclerotic disease than previous models and can be used to identify and test potential new therapeutic agents to prevent major adverse cardiac events.
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MESH Headings
- Animals
- Male
- Mice
- Diet, Western/adverse effects
- Disease Models, Animal
- Enzyme Inhibitors/therapeutic use
- Enzyme Inhibitors/pharmacology
- Mice, Inbred C57BL
- Mice, Knockout
- Myocardial Infarction/pathology
- Myocardial Infarction/drug therapy
- Peroxidase/metabolism
- Plaque, Atherosclerotic/drug therapy
- Receptors, LDL/genetics
- Receptors, LDL/deficiency
- Rupture, Spontaneous
- Scavenger Receptors, Class B/genetics
- Scavenger Receptors, Class B/metabolism
- Stroke/drug therapy
- Stroke/prevention & control
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Affiliation(s)
- Sohel Shamsuzzaman
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Rebecca A. Deaton
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Anita Salamon
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Heather Doviak
- Hematovascular Biology Center, Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Vlad Serbulea
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Victoria M. Milosek
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
- Department of Molecular Physiology and Biophysics, University of Virginia, Charlottesville, VA, USA
| | - Megan A. Evans
- Hematovascular Biology Center, Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Santosh Karnewar
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Subhi Saibaba
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
- Program in Fundamental Neuroscience, University of Virginia, Charlottesville, VA, USA
| | - Gabriel F. Alencar
- Beirne B Carter Center for Immunology Research, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Laura S. Shankman
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Kenneth Walsh
- Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, USA
- Hematovascular Biology Center, Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Stefan Bekiranov
- Hematovascular Biology Center, Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Olivier Kocher
- Department of Pathology and Center for Vascular Biology Research, Beth Israel Medical Deaconess Medical Center Harvard Medical School, Boston, MA, USA
| | - Monty Krieger
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Bengt Kull
- BioPharmaceuticals R&D Early Cardiovascular Renal and Metabolism (CVRM) Bioscience Cardiovascular, AstraZeneca, Mölndal 43183, Sweden
| | - Marie Persson
- BioPharmaceuticals R&D Early Cardiovascular Renal and Metabolism (CVRM) DMPK, AstraZeneca, Mölndal 43183, Sweden
| | - Erik Michaëlsson
- Early Clinical Development, Research and Early Development, Cardiovascular, Renal, and Metabolism, Biopharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Nils Bergenhem
- Alliance Management, Business Development & Licensing, BioPharmaceuticals R&D, AstraZeneca, Waltham, MA, USA
| | - Sepideh Heydarkhan-Hagvall
- AstraZeneca R&D, Chief Medical Office, Global Patient Safety, Pepparedsleden 1, Mölndal, SE43183, Sweden
| | - Gary K. Owens
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, USA
- Department of Molecular Physiology and Biophysics, University of Virginia, Charlottesville, VA, USA
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2
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Mullis DM, Padilla-Lopez A, Wang H, Zhu Y, Elde S, Bonham SA, Yajima S, Kocher ON, Krieger M, Woo YJ. Stromal cell-derived factor-1 alpha improves cardiac function in a novel diet-induced coronary atherosclerosis model, the SR-B1ΔCT/LDLR KO mouse. Atherosclerosis 2024; 395:117518. [PMID: 38627162 PMCID: PMC11254567 DOI: 10.1016/j.atherosclerosis.2024.117518] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 02/28/2024] [Accepted: 03/12/2024] [Indexed: 06/13/2024]
Abstract
BACKGROUND AND AIMS There are a limited number of pharmacologic therapies for coronary artery disease, and few rodent models of occlusive coronary atherosclerosis and consequent myocardial infarction with which one can rapidly test new therapeutic approaches. Here, we characterize a novel, fertile, and easy-to-use HDL receptor (SR-B1)-based model of atherogenic diet-inducible, fatal coronary atherosclerosis, the SR-B1ΔCT/LDLR KO mouse. Additionally, we test intramyocardial injection of Stromal Cell-Derived Factor-1 alpha (SDF-1α), a potent angiogenic cytokine, as a possible therapy to rescue cardiac function in this mouse. METHODS SR-B1ΔCT/LDLR KO mice were fed the Paigen diet or standard chow diet, and we determined the effects of the diets on cardiac function, histology, and survival. After two weeks of feeding either the Paigen diet (n = 24) or standard chow diet (n = 20), the mice received an intramyocardial injection of either SDF-1α or phosphate buffered saline (PBS). Cardiac function and angiogenesis were assessed two weeks later. RESULTS When six-week-old mice were fed the Paigen diet, they began to die as early as 19 days later and 50% had died by 38 days. None of the mice maintained on the standard chow diet died by day 72. Hearts from mice on the Paigen diet showed evidence of cardiomegaly, myocardial infarction, and occlusive coronary artery disease. For the five mice that survived until day 28 that underwent an intramyocardial injection of PBS on day 15, the average ejection fraction (EF) decreased significantly from day 14 (the day before injection, 52.1 ± 4.3%) to day 28 (13 days after the injection, 30.6 ± 6.8%) (paired t-test, n = 5, p = 0.0008). Of the 11 mice fed the Paigen diet and injected with SDF-1α on day 15, 8 (72.7%) survived to day 28. The average EF for these 8 mice increased significantly from 48.2 ± 7.2% on day 14 to63.6 ± 6.9% on day 28 (Paired t-test, n = 8, p = 0.003). CONCLUSIONS This new mouse model and treatment with the promising angiogenic cytokine SDF-1α may lead to new therapeutic approaches for ischemic heart disease.
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MESH Headings
- Animals
- Chemokine CXCL12/metabolism
- Chemokine CXCL12/genetics
- Disease Models, Animal
- Mice, Knockout
- Coronary Artery Disease
- Receptors, LDL/genetics
- Receptors, LDL/deficiency
- Scavenger Receptors, Class B/genetics
- Male
- Neovascularization, Physiologic/drug effects
- Mice, Inbred C57BL
- Diet, Atherogenic
- Mice
- Ventricular Function, Left
- Myocardium/pathology
- Myocardium/metabolism
- Diet, High-Fat
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Affiliation(s)
- Danielle M Mullis
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
| | | | - Hanjay Wang
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
| | - Yuanjia Zhu
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA; Department of Bioengineering, Stanford University, Stanford, CA, USA
| | - Stefan Elde
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
| | - Spencer A Bonham
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
| | - Shin Yajima
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
| | - Olivier N Kocher
- Department of Pathology, Beth Israel Hospital, Harvard Medical School, Boston, MA, USA
| | - Monty Krieger
- Department of Biology, Massachusetts Institute of Technology, MA, USA
| | - Y Joseph Woo
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA; Department of Bioengineering, Stanford University, Stanford, CA, USA.
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3
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Yang Q, Tao J, Xin X, Zhang J, Fan Z. Association between depression and infertility risk among American women aged 18-45 years: the mediating effect of the NHHR. Lipids Health Dis 2024; 23:178. [PMID: 38858764 PMCID: PMC11163758 DOI: 10.1186/s12944-024-02164-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 05/26/2024] [Indexed: 06/12/2024] Open
Abstract
BACKGROUND/OBJECTIVE Depression and infertility are major medical and social problems. The non-high-density lipoprotein cholesterol to high-density lipoprotein cholesterol ratio (NHHR) serves as an innovative and reliable lipid marker for cardiovascular disease risk assessment. Previous research has indicated a potential correlation among lipid metabolism, depression, and infertility. Nonetheless, the exact involvement of lipid metabolism in modulating the pathological mechanisms associated with depression-induced infertility remains to be fully elucidated. The aim of this study was to explore the connection between depression and infertility and to assess whether the NHHR mediates this association. METHODS A cross-sectional analysis was performed utilizing data from there cycles (2013-2018) of the National Health and Nutrition Examination Survey (NHANES) database. Female infertility was assessed according to the responses to the RHQ074 question in the reproductive health questionnaire module. Depression states were evaluated using the Patient Health Questionnaire-9 and classified into three grades based on the total scores: no depression (0-4 points), minimal-to-mild depression (5-9 points) and moderate-to-severe depression (10 or more points). The NHHR was calculated from laboratory cholesterol test results. Baseline population characteristics were compared, and subgroup analyses were carried out based on the stratification of age and body mass index (BMI). Weighted multivariable logistic regression and linear regression models, with adjustments for various covariables, were employed to examine the associations among depression, infertility and the NHHR. Finally, mediation analysis was utilized to explore the NHHR's potential mediating role in depression states and female infertility. RESULTS Within this cross-sectional study, 2,668 women aged 18 to 45 years residing in the United States were recruited, 305 (11.43%) of whom experienced infertility. The study revealed a markedly higher prevalence of depression (P = 0.040) and elevated NHHR (P < 0.001) among infertile women compared to the control cohort. Furthermore, moderate-to-severe depression states independently correlated with increased infertility risk, irrespective of adjustments for various covariables. Subgroup analysis indicated a positive association between depression and infertility risk within certain age categories, although no such relationship was observed within subgroups stratified by BMI. The findings from the weighted logistic regression analysis demonstrated that the elevated NHHR is positively associated with heightened infertility risk. Additionally, the weighted linear regression analysis indicated that moderate-to-severe depression is positively linked to the NHHR levels as well. Finally, the association between depression states and female infertility was partially mediated by the NHHR, with the mediation proportion estimated at 6.57%. CONCLUSION In the United States, depression is strongly correlated with an increased likelihood of infertility among women of childbearing age, with evidence suggesting that this relationship is mediated by the NHHR. Subsequent research efforts should further explore the underlying mechanisms connecting depression and infertility.
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Affiliation(s)
- QiaoRui Yang
- Department of Gynecology, Guanghua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jing Tao
- Heilongjiang University of Chinese Medicine, Heilongjiang, China
| | - Xin Xin
- Department of Gynecology, Guanghua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - JinFu Zhang
- Department of Gynecology, Guanghua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.
- Department of Gynecology, Shenzhen Hospital of Shanghai University of Traditional Chinese Medicine, Guangdong, China.
| | - ZhenLiang Fan
- Nephrology Department, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Chinese Medicine), Zhejiang, China.
- Academy of Chinese Medical Science, Zhejiang Chinese Medical University, Zhejiang, China.
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4
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Mitsui J, Ibayashi M, Aizawa R, Ishikawa T, Miyasaka N, Tsukamoto S. Lipid droplets synthesized during luteinization are degraded after pregnancy. J Reprod Dev 2024; 70:72-81. [PMID: 38311402 PMCID: PMC11017094 DOI: 10.1262/jrd.2023-095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Accepted: 12/31/2023] [Indexed: 02/10/2024] Open
Abstract
After pregnancy, the corpus luteum (CL) functions as a transient endocrine gland that produces progesterone, which is necessary to maintain pregnancy. To maintain constant progesterone production, CLs are enriched in lipids as its precursors. Lipid droplets (LDs) are organelles that originate from the endoplasmic reticulum and store neutral lipids such as triacylglycerols and cholesteryl esters. The size and number of LDs in a cell are regulated by LD-associated proteins that coat their surface. LD degradation is regulated by either neutral lipid hydrolases (lipolysis), selective autophagic mechanism (lipophagy), or both. Mammalian CLs are long known to be enriched in LDs, but LDs are rapidly depleted after pregnancy and reappear near the time of delivery. In this present study, we hypothesized that LDs synthesized by luteinization are massively degraded after pregnancy. Using mCherry-HPos mice, in which LD synthesis can be visualized in vivo, we found that LD synthesis, which was activated during luteal development, was suppressed after implantation. In CLs, LD synthesis remained low during pregnancy, but was reactivated before and after delivery. These changes in LDs were confirmed using electron microscopy and immunostaining. Furthermore, LD degradation was mediated by lipolysis rather than lipophagy. In summary, our findings indicate that luteinization-induced LD synthesis is suppressed after pregnancy onset and that CLs are lipid-poor during pregnancy because LDs stored during luteal development are extensively degraded by lipolysis.
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Affiliation(s)
- Junichiro Mitsui
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- Department of Comprehensive Reproductive Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Megumi Ibayashi
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Ryutaro Aizawa
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Tomonori Ishikawa
- Perinatal and Maternal Medicine (Ibaraki), Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Naoyuki Miyasaka
- Department of Comprehensive Reproductive Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Satoshi Tsukamoto
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
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5
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Perswani P, Ismail SM, Mumtaz H, Uddin N, Asfand M, Khalil ABB, Ijlal A, Khan SE, Usman M, Younas H, Rai A. Rethinking HDL-C: An In-Depth Narrative Review of Its Role in Cardiovascular Health. Curr Probl Cardiol 2024; 49:102152. [PMID: 37852560 DOI: 10.1016/j.cpcardiol.2023.102152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 10/14/2023] [Indexed: 10/20/2023]
Abstract
The interplay between HDL-C and LDL levels are closely intertwined with the cardiovascular system. High-Density Lipoprotein Cholesterol (HDL-C) is a well-known biomarker traditionally being interpreted as higher the HDL-C levels, minimal the risk of adverse cardiovascular disease (CVD) outcomes. However, recent research has unveiled a more complex relationship between HDL-C levels and cardiovascular outcomes, including genetic influences and potential risks associated with extremely high HDL-C levels. Intriguingly, extremely high HDL-C levels have been linked to unexpected cardiovascular risks. Up To date research suggests that individuals with genetically linked ultra-high HDL-C levels may depict an increased susceptibility to CVD, challenging the conventional realm that higher HDL-C is always beneficial. The mechanisms underlying this mystery are not fully understood but may involve HDL particle functionality and composition. In a nutshell, the relationship between HDL-C levels and cardiovascular outcomes is multifactorial. While low HDL-C remains a recognized risk factor for CVD, the genetic determinants of HDL-C levels add complexity to this association. Furthermore, extremely high HDL-C levels may not exhibit the expected protective benefits and may even pose unprecedented cardiovascular risks. A comprehensive understanding of these dynamics is essential for advancing our knowledge of CVD risk assessment and developing targeted therapeutic interventions. Further studies are needed to unravel the intricacies of HDL-C's role in cardiovascular health and disease.
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Affiliation(s)
| | | | - Hassan Mumtaz
- Care Coordinator: Association for Social Development, Islamabad, Pakistan; International Practitioner: Faculty of Public Health UK.
| | - Naseer Uddin
- Department of Medicine, Dow University of Health Sciences, Karachi, Pakistan.
| | | | | | - Aisha Ijlal
- South City Institute of physical therapy and rehabilitation, Karachi.
| | - Shaheer Ellahi Khan
- Associate Professor of Public Health: Health services Academy, Islamabad, Pakistan; Adjunct Professor: Dala Lana School Of Public Health, University of Toronto, Canada.
| | | | - Hadia Younas
- Services institute of medical Sciences, Lahore, Pakistan.
| | - Anushree Rai
- Govt. Chhattisgarh institute of Medical sciences, Bilaspur, Chhattisgarh, India.
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Gillard BK, Rosales C, Gotto AM, Pownall HJ. The pathophysiology of excess plasma-free cholesterol. Curr Opin Lipidol 2023; 34:278-286. [PMID: 37732779 PMCID: PMC10624414 DOI: 10.1097/mol.0000000000000899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
PURPOSE OF REVIEW Several large studies have shown increased mortality due to all-causes and to atherosclerotic cardiovascular disease. In most clinical settings, plasma HDL-cholesterol is determined as a sum of free cholesterol and cholesteryl ester, two molecules with vastly different metabolic itineraries. We examine the evidence supporting the concept that the pathological effects of elevations of plasma HDL-cholesterol are due to high levels of the free cholesterol component of HDL-C. RECENT FINDINGS In a small population of humans, a high plasma HDL-cholesterol is associated with increased mortality. Similar observations in the HDL-receptor deficient mouse (Scarb1 -/- ), a preclinical model of elevated HDL-C, suggests that the pathological component of HDL in these patients is an elevated plasma HDL-FC. SUMMARY Collective consideration of the human and mouse data suggests that clinical trials, especially in the setting of high plasma HDL, should measure free cholesterol and cholesteryl esters and not just total cholesterol.
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Affiliation(s)
- Baiba K. Gillard
- Center for Bioenergetics, Houston Methodist, Houston, Texas
- Weill Cornell Medicine, New York, New York, USA
| | - Corina Rosales
- Center for Bioenergetics, Houston Methodist, Houston, Texas
- Weill Cornell Medicine, New York, New York, USA
| | - Antonio M. Gotto
- Center for Bioenergetics, Houston Methodist, Houston, Texas
- Weill Cornell Medicine, New York, New York, USA
| | - Henry J. Pownall
- Center for Bioenergetics, Houston Methodist, Houston, Texas
- Weill Cornell Medicine, New York, New York, USA
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7
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Begue F, Apalama ML, Lambert G, Meilhac O. HDL as a Treatment Target: Should We Abandon This Idea? Curr Atheroscler Rep 2023; 25:1093-1099. [PMID: 38051472 DOI: 10.1007/s11883-023-01176-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2023] [Indexed: 12/07/2023]
Abstract
PURPOSE OF REVIEW High-density lipoproteins (HDL) have long been regarded as an antiatherogenic lipoprotein species by virtue of their role in reverse cholesterol transport (RCT), as well as their established anti-inflammatory and antioxidant properties. For decades, HDL have been an extremely appealing therapeutic target to combat atherosclerotic cardiovascular diseases (ASCVD). RECENT FINDINGS Unfortunately, neither increasing HDL with drugs nor direct infusions of reconstituted HDL have convincedly proven to be positive strategies for cardiovascular health, raising the question of whether we should abandon the idea of considering HDL as a treatment target. The results of two large clinical trials, one testing the latest CETP inhibitor Obicetrapib and the other testing the infusion of patients post-acute coronary events with reconstituted HDL, are still awaited. If they prove negative, these trials will seal the fate of HDL as a direct therapeutic target. However, using HDL as a therapeutic agent still holds promise if we manage to optimize their beneficial properties for not only ASCVD but also outside the cardiovascular field.
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Affiliation(s)
- Floran Begue
- Inserm, UMR 1188 Diabète Athérothrombose Thérapies Réunion Océan Indien (DéTROI), Université de La Réunion, 97410, Saint-Pierre, France
| | - Marie Laurine Apalama
- Inserm, UMR 1188 Diabète Athérothrombose Thérapies Réunion Océan Indien (DéTROI), Université de La Réunion, 97410, Saint-Pierre, France
| | - Gilles Lambert
- Inserm, UMR 1188 Diabète Athérothrombose Thérapies Réunion Océan Indien (DéTROI), Université de La Réunion, 97410, Saint-Pierre, France.
| | - Olivier Meilhac
- Inserm, UMR 1188 Diabète Athérothrombose Thérapies Réunion Océan Indien (DéTROI), Université de La Réunion, 97410, Saint-Pierre, France
- CHU de La Réunion, 97400, Saint-Denis, France
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8
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Staršíchová A. SR-B1-/-ApoE-R61h/h Mice Mimic Human Coronary Heart Disease. Cardiovasc Drugs Ther 2023:10.1007/s10557-023-07475-8. [PMID: 37273155 DOI: 10.1007/s10557-023-07475-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/22/2023] [Indexed: 06/06/2023]
Abstract
Cardiovascular diseases are the leading cause of death in the modern world. Atherosclerosis underlies the majority of these pathologies and may result in sudden life-threatening events such as myocardial infarction or stroke. Current concepts consider a rupture (resp. erosion) of "unstable/vulnerable" atherosclerotic plaques as a primary cause leading to thrombus formation and subsequent occlusion of the artery lumen finally triggering an acute clinical event. We and others described SR-B1-/-ApoE-R61h/h mice mimicking clinical coronary heart disease in all major aspects: from coronary atherosclerosis through vulnerable plaque ruptures leading to thrombus formation/coronary artery occlusion, finally resulting in myocardial infarction/ischemia. SR-B1-/-ApoE-R61h/h mouse provides a valuable model to study vulnerable/occlusive plaques, to evaluate bioactive compounds as well as new anti-inflammatory and "anti-rupture" drugs, and to test new technologies in experimental cardiovascular medicine. This review summarizes and discuss our knowledge about SR-B1-/-ApoE-R61h/h mouse model based on recent publications and experimental observations from the lab.
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Affiliation(s)
- Andrea Staršíchová
- Graduate School Cell Dynamics and Disease, University of Muenster, Muenster, Germany.
- European Institute for Molecular Imaging, University of Muenster, Muenster, Germany.
- Novogenia Covid GmbH, Eugendorf, Austria.
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9
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Verwilligen RAF, Mulder L, Araújo PM, Carneiro M, Bussmann J, Hoekstra M, Van Eck M. Zebrafish as outgroup model to study evolution of scavenger receptor class B type I functions. Biochim Biophys Acta Mol Cell Biol Lipids 2023; 1868:159308. [PMID: 36931457 DOI: 10.1016/j.bbalip.2023.159308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 01/26/2023] [Accepted: 02/25/2023] [Indexed: 03/17/2023]
Abstract
BACKGROUND AND AIMS Scavenger receptor class B1 (SCARB1) - also known as the high-density lipoprotein (HDL) receptor - is a multi-ligand scavenger receptor that is primarily expressed in liver and steroidogenic organs. This receptor is known for its function in reverse cholesterol transport (RCT) in mammals and hence disruption leads to a massive increase in HDL cholesterol in these species. The extracellular domain of SCARB1 - which is important for cholesterol handling - is highly conserved across multiple vertebrates, except in zebrafish. METHODS To examine the functional conservation of SCARB1 among vertebrates, two stable scarb1 knockout zebrafish lines, scarb1 715delA (scarb1 -1 nt) and scarb1 715_716insGG (scarb1 +2 nt), were created using CRISPR-Cas9 technology. RESULTS We demonstrate that, in zebrafish, SCARB1 deficiency leads to disruption of carotenoid-based pigmentation, reduced fertility, and a decreased larvae survival rate, whereas steroidogenesis was unaltered. The observed reduced fertility is driven by defects in female fertility (-50 %, p < 0.001). Importantly, these alterations were independent of changes in free (wild-type 2.4 ± 0.2 μg/μl versus scarb1-/- 2.0 ± 0.1 μg/μl) as well as total (wild-type 4.2 ± 0.4 μg/μl versus scarb1-/- 4.0 ± 0.3 μg/μl) plasma cholesterol levels. Uptake of HDL in the liver of scarb1-/- zebrafish larvae was reduced (-86.7 %, p < 0.001), but this coincided with reduced perfusion of the liver. No effect was observed on lipoprotein uptake in the caudal vein. SCARB1 deficient canaries, which also lack carotenoids in their plumage, similarly as scarb1-/- zebrafish, failed to show an increase in plasma free- and total cholesterol levels. CONCLUSION Our findings suggest that the specific function of SCARB1 in maintaining plasma cholesterol could be an evolutionary novelty that became prominent in mammals, while other known functions were already present earlier during vertebrate evolution.
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Affiliation(s)
- Robin A F Verwilligen
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands.
| | - Lindsay Mulder
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands
| | - Pedro M Araújo
- University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department Life Sciences, Coimbra, Portugal; CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal; BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
| | - Miguel Carneiro
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO, Universidade do Porto, Vairão, Portugal; BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
| | - Jeroen Bussmann
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands
| | - Menno Hoekstra
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands; Division of Systems Pharmacology and Pharmacy, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands; Pharmacy Leiden, Leiden, the Netherlands
| | - Miranda Van Eck
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands; Division of Systems Pharmacology and Pharmacy, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, the Netherlands; Pharmacy Leiden, Leiden, the Netherlands
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10
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Ibayashi M, Aizawa R, Mitsui J, Tsukamoto S. Lipid droplet synthesis is associated with angiogenesis in mouse ovarian follicles†. Biol Reprod 2023; 108:492-503. [PMID: 36579469 DOI: 10.1093/biolre/ioac223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 11/21/2022] [Accepted: 12/24/2022] [Indexed: 12/30/2022] Open
Abstract
Lipid droplets (LDs) are endoplasmic reticulum (ER)-derived organelles comprising a core of neutral lipids surrounded by a phospholipid monolayer. Lipid droplets play important roles in lipid metabolism and energy homeostasis. Mammalian ovaries have been hypothesized to use neutral lipids stored in LDs to produce the hormones and nutrients necessary for rapid follicular development; however, our understanding of LD synthesis remains incomplete. In this study, we generated transgenic reporter mice that express mCherry fused to HPos, a minimal peptide that localizes specifically to nascent LDs synthesized at the ER. With this tool for visualizing initial LD synthesis in ovaries, we found that LDs are synthesized continuously in theca cells but rarely in inner granulosa cells (Gc) during early follicular development. Administration of exogenous gonadotropin enhances LD synthesis in the Gc, suggesting that LD synthesis is hormonally regulated. In contrast, we observed copious LD synthesis in the corpus luteum, and excessive LDs accumulation in atretic follicles. Furthermore, we demonstrated that LD synthesis is synchronized with angiogenesis around the follicle and that suppressing angiogenesis caused defective LD biosynthesis in developing follicles. Overall, our study is the first to demonstrate a spatiotemporally regulated interplay between LD synthesis and neovascularization during mammalian follicular development.
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Affiliation(s)
- Megumi Ibayashi
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Anagawa, Chiba, Japan
| | - Ryutaro Aizawa
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Anagawa, Chiba, Japan
| | - Junichiro Mitsui
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Anagawa, Chiba, Japan
- Department of Comprehensive Reproductive Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
| | - Satoshi Tsukamoto
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Anagawa, Chiba, Japan
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11
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Futamata R, Kinoshita M, Ogiwara K, Kioka N, Ueda K. Cholesterol accumulation in ovarian follicles causes ovulation defects in Abca1a -/- Japanese medaka ( Oryzias latipes). Heliyon 2023; 9:e13291. [PMID: 36816300 PMCID: PMC9932449 DOI: 10.1016/j.heliyon.2023.e13291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 01/22/2023] [Accepted: 01/26/2023] [Indexed: 02/01/2023] Open
Abstract
ATP-binding cassette A1 (ABCA1) is a membrane protein, which exports excess cellular cholesterol to generate HDL to reduce the risk of the onset of cardiovascular diseases (CVD). In addition, ABCA1 exerts pleiotropic effects on such as inflammation, tissue repair, and cell proliferation and migration. In this study, we explored the novel physiological roles of ABCA1 using Japanese medaka (Oryzias latipes), a small teleost fish. Three Abca1 genes were found in the medaka genome. ABCA1A and ABCA1C exported cholesterol to generate nascent HDL as human ABCA1 when expressed in HEK293 cells. To investigate their physiological roles, each Abca1-deficient fish was generated using the CRISPR-Cas9 system. Abca1a -/- female medaka was found to be infertile, while Abca1b -/- and Abca1c -/- female medaka were fertile. In vitro ovarian follicle culture suggested that Abca1a deficiency causes ovulation defects. In the ovary, ABCA1A was expressed in theca cells, an outermost layer of the ovarian follicle. Total cholesterol content of Abca1a -/- ovary was significantly higher than that of the wild-type, while estrogen and progestin contents were compatible with those of the wild-type. Furthermore, cholesterol loading to the wild-type follicles caused ovulation defects. These results suggest that ABCA1A in theca cells regulates cholesterol content in the ovarian follicles and its deficiency inhibits successful ovulation through cholesterol accumulation in the ovarian follicle.
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Affiliation(s)
- Ryota Futamata
- Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Masato Kinoshita
- Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Katsueki Ogiwara
- Laboratory of Reproductive and Developmental Biology, Faculty of Science, Hokkaido University, Sapporo, Japan
| | - Noriyuki Kioka
- Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Kazumitsu Ueda
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), KUIAS, Kyoto University, Kyoto 606-8501, Japan
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12
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Paterson HAB, Yu S, Artigas N, Prado MA, Haberman N, Wang YF, Jobbins AM, Pahita E, Mokochinski J, Hall Z, Guerin M, Paulo JA, Ng SS, Villarroya F, Rashid ST, Le Goff W, Lenhard B, Cebola I, Finley D, Gygi SP, Sibley CR, Vernia S. Liver RBFOX2 regulates cholesterol homeostasis via Scarb1 alternative splicing in mice. Nat Metab 2022; 4:1812-1829. [PMID: 36536133 PMCID: PMC9771820 DOI: 10.1038/s42255-022-00681-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 10/10/2022] [Indexed: 12/24/2022]
Abstract
RNA alternative splicing (AS) expands the regulatory potential of eukaryotic genomes. The mechanisms regulating liver-specific AS profiles and their contribution to liver function are poorly understood. Here, we identify a key role for the splicing factor RNA-binding Fox protein 2 (RBFOX2) in maintaining cholesterol homeostasis in a lipogenic environment in the liver. Using enhanced individual-nucleotide-resolution ultra-violet cross-linking and immunoprecipitation, we identify physiologically relevant targets of RBFOX2 in mouse liver, including the scavenger receptor class B type I (Scarb1). RBFOX2 function is decreased in the liver in diet-induced obesity, causing a Scarb1 isoform switch and alteration of hepatocyte lipid homeostasis. Our findings demonstrate that specific AS programmes actively maintain liver physiology, and underlie the lipotoxic effects of obesogenic diets when dysregulated. Splice-switching oligonucleotides targeting this network alleviate obesity-induced inflammation in the liver and promote an anti-atherogenic lipoprotein profile in the blood, underscoring the potential of isoform-specific RNA therapeutics for treating metabolism-associated diseases.
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Affiliation(s)
- Helen A B Paterson
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Sijia Yu
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Natalia Artigas
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Miguel A Prado
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
- Instituto de Investigación Sanitaria del Principado de Asturias, Avenida Hospital Universitario, Oviedo, Spain
| | - Nejc Haberman
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Yi-Fang Wang
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Andrew M Jobbins
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Elena Pahita
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Joao Mokochinski
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Zoe Hall
- Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Maryse Guerin
- Sorbonne Université, Inserm, Institute of Cardiometabolism and Nutrition (ICAN), UMR_S1166, Paris, France
| | - Joao A Paulo
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Soon Seng Ng
- Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Francesc Villarroya
- Biochemistry and Molecular Biomedicine Department, Institute of Biomedicine, University of Barcelona & Research Institute Sant Joan de Déu, Barcelona, Spain
- Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), ISCIII, Madrid, Spain
| | - Sheikh Tamir Rashid
- Division of Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Wilfried Le Goff
- Sorbonne Université, Inserm, Institute of Cardiometabolism and Nutrition (ICAN), UMR_S1166, Paris, France
| | - Boris Lenhard
- MRC London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Inês Cebola
- Section of Genetics and Genomics, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, London, UK
| | - Daniel Finley
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Christopher R Sibley
- Institute of Quantitative Biology, Biochemistry and Biotechnology. School of Biological Sciences, University of Edinburgh, Edinburgh, UK
| | - Santiago Vernia
- MRC London Institute of Medical Sciences, London, UK.
- Institute of Clinical Sciences, Imperial College London, Hammersmith Hospital Campus, London, UK.
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13
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Clark KL, George JW, Przygrodzka E, Plewes MR, Hua G, Wang C, Davis JS. Hippo Signaling in the Ovary: Emerging Roles in Development, Fertility, and Disease. Endocr Rev 2022; 43:1074-1096. [PMID: 35596657 PMCID: PMC9695108 DOI: 10.1210/endrev/bnac013] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Indexed: 01/09/2023]
Abstract
Emerging studies indicate that the Hippo pathway, a highly conserved pathway that regulates organ size control, plays an important role in governing ovarian physiology, fertility, and pathology. Specific to the ovary, the spatiotemporal expression of the major components of the Hippo signaling cascade are observed throughout the reproductive lifespan. Observations from multiple species begin to elucidate the functional diversity and molecular mechanisms of Hippo signaling in the ovary in addition to the identification of interactions with other signaling pathways and responses to various external stimuli. Hippo pathway components play important roles in follicle growth and activation, as well as steroidogenesis, by regulating several key biological processes through mechanisms of cell proliferation, migration, differentiation, and cell fate determination. Given the importance of these processes, dysregulation of the Hippo pathway contributes to loss of follicular homeostasis and reproductive disorders such as polycystic ovary syndrome (PCOS), premature ovarian insufficiency, and ovarian cancers. This review highlights what is currently known about the Hippo pathway core components in ovarian physiology, including ovarian development, follicle development, and oocyte maturation, while identifying areas for future research to better understand Hippo signaling as a multifunctional pathway in reproductive health and biology.
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Affiliation(s)
- Kendra L Clark
- Olson Center for Women's Health, Department of Obstetrics and Gynecology, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Veterans Affairs Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA
| | - Jitu W George
- Olson Center for Women's Health, Department of Obstetrics and Gynecology, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Veterans Affairs Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA
| | - Emilia Przygrodzka
- Olson Center for Women's Health, Department of Obstetrics and Gynecology, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Veterans Affairs Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA
| | - Michele R Plewes
- Olson Center for Women's Health, Department of Obstetrics and Gynecology, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Veterans Affairs Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA
| | - Guohua Hua
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science & Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, China
| | - Cheng Wang
- Department of Obstetrics and Gynecology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - John S Davis
- Olson Center for Women's Health, Department of Obstetrics and Gynecology, University of Nebraska Medical Center, Omaha, NE 68198, USA.,Veterans Affairs Nebraska Western Iowa Health Care System, Omaha, NE 68105, USA
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14
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Arias A, Quiroz A, Santander N, Morselli E, Busso D. Implications of High-Density Cholesterol Metabolism for Oocyte Biology and Female Fertility. Front Cell Dev Biol 2022; 10:941539. [PMID: 36187480 PMCID: PMC9518216 DOI: 10.3389/fcell.2022.941539] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/01/2022] [Indexed: 11/28/2022] Open
Abstract
Cholesterol is an essential component of animal cells. Different regulatory mechanisms converge to maintain adequate levels of this lipid because both its deficiency and excess are unfavorable. Low cell cholesterol content promotes its synthesis and uptake from circulating lipoproteins. In contrast, its excess induces the efflux to high-density lipoproteins (HDL) and their transport to the liver for excretion, a process known as reverse cholesterol transport. Different studies suggest that an abnormal HDL metabolism hinders female fertility. HDL are the only lipoproteins detected in substantial amounts in follicular fluid (FF), and their size and composition correlate with embryo quality. Oocytes obtain cholesterol from cumulus cells via gap junctions because they cannot synthesize cholesterol de novo and lack HDL receptors. Recent evidence has supported the possibility that FF HDL play a major role in taking up excess unesterified cholesterol (UC) from the oocyte. Indeed, genetically modified mouse models with disruptions in reverse cholesterol transport, some of which show excessive circulating UC levels, exhibit female infertility. Cholesterol accumulation can affect the egg´s viability, as reported in other cell types, and activate the plasma membrane structure and activity of membrane proteins. Indeed, in mice deficient for the HDL receptor Scavenger Class B Type I (SR-B1), excess circulating HDL cholesterol and UC accumulation in oocytes impairs meiosis arrest and hinders the developmental capacity of the egg. In other cells, the addition of cholesterol activates calcium channels and dysregulates cell death/survival signaling pathways, suggesting that these mechanisms may link altered HDL cholesterol metabolism and infertility. Although cholesterol, and lipids in general, are usually not evaluated in infertile patients, one study reported high circulating UC levels in women showing longer time to pregnancy as an outcome of fertility. Based on the evidence described above, we propose the existence of a well-regulated and largely unexplored system of cholesterol homeostasis controlling traffic between FF HDL and oocytes, with significant implications for female fertility.
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Affiliation(s)
- Andreina Arias
- Laboratory of Nutrition, Metabolism and Reproduction, Research and Innovation Center, Program of Reproductive Biology, Universidad de Los Andes, Santiago, Chile
- Faculty of Biological Sciences, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alonso Quiroz
- Laboratory of Nutrition, Metabolism and Reproduction, Research and Innovation Center, Program of Reproductive Biology, Universidad de Los Andes, Santiago, Chile
- School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nicolás Santander
- Instituto de Ciencias de la Salud, Universidad de O’Higgins, Rancagua, Chile
| | - Eugenia Morselli
- Department of Basic Sciences, Faculty of Medicine and Sciences, Universidad San Sebastián, Santiago, Chile
| | - Dolores Busso
- Laboratory of Nutrition, Metabolism and Reproduction, Research and Innovation Center, Program of Reproductive Biology, Universidad de Los Andes, Santiago, Chile
- IMPACT, Center of Interventional Medicine for Precision and Advanced Cellular Therapy, Santiago, Chile
- *Correspondence: Dolores Busso,
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15
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Shen Y, Gu HM, Zhai L, Wang B, Qin S, Zhang DW. The role of hepatic Surf4 in lipoprotein metabolism and the development of atherosclerosis in apoE -/- mice. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159196. [PMID: 35803528 DOI: 10.1016/j.bbalip.2022.159196] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/25/2022] [Accepted: 06/30/2022] [Indexed: 11/26/2022]
Abstract
Elevated plasma levels of low-density lipoprotein-C (LDL-C) increase the risk of atherosclerotic cardiovascular disease. Circulating LDL is derived from very low-density lipoprotein (VLDL) metabolism and cleared by LDL receptor (LDLR). We have previously demonstrated that cargo receptor Surfeit 4 (Surf4) mediates VLDL secretion. Inhibition of hepatic Surf4 impairs VLDL secretion, significantly reduces plasma LDL-C levels, and markedly mitigates the development of atherosclerosis in LDLR knockout (Ldlr-/-) mice. Here, we investigated the role of Surf4 in lipoprotein metabolism and the development of atherosclerosis in another commonly used mouse model of atherosclerosis, apolipoprotein E knockout (apoE-/-) mice. Adeno-associated viral shRNA was used to silence Surf4 expression mainly in the liver of apoE-/- mice. In apoE-/- mice fed a regular chow diet, knockdown of Surf4 expression significantly reduced triglyceride secretion and plasma levels of non-HDL cholesterol and triglycerides without causing hepatic lipid accumulation or liver damage. When Surf4 was knocked down in apoE-/- mice fed the Western-type diet, we observed a significant reduction in plasma levels of non-HDL cholesterol, but not triglycerides. Knockdown of Surf4 did not increase hepatic cholesterol and triglyceride levels or cause liver damage, but significantly diminished atherosclerosis lesions. Therefore, our findings indicate the potential of hepatic Surf4 inhibition as a novel therapeutic strategy to reduce the risk of atherosclerotic cardiovascular disease.
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Affiliation(s)
- Yishi Shen
- Group on the Molecular and Cell Biology of Lipids and Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Hong-Mei Gu
- Group on the Molecular and Cell Biology of Lipids and Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Lei Zhai
- Institute of Atherosclerosis in Shandong First Medical University (Shandong Academy of Medical Sciences), Taian, China
| | - Binxiang Wang
- Institute of Atherosclerosis in Shandong First Medical University (Shandong Academy of Medical Sciences), Taian, China
| | - Shucun Qin
- Institute of Atherosclerosis in Shandong First Medical University (Shandong Academy of Medical Sciences), Taian, China.
| | - Da-Wei Zhang
- Group on the Molecular and Cell Biology of Lipids and Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.
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16
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Abstract
PURPOSE OF REVIEW Scavenger receptor class B type 1 (SR-B1) promotes atheroprotection through its role in HDL metabolism and reverse cholesterol transport in the liver. However, evidence indicates that SR-B1 may impact atherosclerosis through nonhepatic mechanisms. RECENT FINDINGS Recent studies have brought to light various mechanisms by which SR-B1 affects lesional macrophage function and protects against atherosclerosis. Efferocytosis is efficient in early atherosclerotic lesions. At this stage, and beyond its role in cholesterol efflux, SR-B1 promotes free cholesterol-induced apoptosis of macrophages through its control of apoptosis inhibitor of macrophage (AIM). At more advanced stages, macrophage SR-B1 binds and mediates the removal of apoptotic cells. SR-B1 also participates in the induction of autophagy which limits necrotic core formation and increases plaque stability. SUMMARY These studies shed new light on the atheroprotective role of SR-B1 by emphasizing its essential contribution in macrophages during atherogenesis as a function of lesion stages. These new findings suggest that macrophage SR-B1 is a therapeutic target in cardiovascular disease.
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Affiliation(s)
- Thierry Huby
- Sorbonne Universités, INSERM, Institute of Cardiometabolism and Nutrition (ICAN), UMR_S1166, Paris, France
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17
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Yang T, Zhao J, Liu F, Li Y. Lipid metabolism and endometrial receptivity. Hum Reprod Update 2022; 28:858-889. [PMID: 35639910 DOI: 10.1093/humupd/dmac026] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 04/27/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Obesity has now been recognized as a high-risk factor for reproductive health. Although remarkable advancements have been made in ART, a considerable number of infertile obese women still suffer from serial implantation failure, despite the high quality of embryos transferred. Although obesity has long been known to exert various deleterious effects on female fertility, the underlying mechanisms, especially the roles of lipid metabolism in endometrial receptivity, remain largely elusive. OBJECTIVE AND RATIONALE This review summarizes current evidence on the impacts of several major lipids and lipid-derived mediators on the embryonic implantation process. Emerging methods for evaluating endometrial receptivity, for example transcriptomic and lipidomic analysis, are also discussed. SEARCH METHODS The PubMed and Embase databases were searched using the following keywords: (lipid or fatty acid or prostaglandin or phospholipid or sphingolipid or endocannabinoid or lysophosphatidic acid or cholesterol or progesterone or estrogen or transcriptomic or lipidomic or obesity or dyslipidemia or polycystic ovary syndrome) AND (endometrial receptivity or uterine receptivity or embryo implantation or assisted reproductive technology or in vitro fertilization or embryo transfer). A comprehensive literature search was performed on the roles of lipid-related metabolic pathways in embryo implantation published between January 1970 and March 2022. Only studies with original data and reviews published in English were included in this review. Additional information was obtained from references cited in the articles resulting from the literature search. OUTCOMES Recent studies have shown that a fatty acids-related pro-inflammatory response in the embryo-endometrium boundary facilitates pregnancy via mediation of prostaglandin signaling. Phospholipid-derived mediators, for example endocannabinoids, lysophosphatidic acid and sphingosine-1-phosphate, are associated with endometrial receptivity, embryo spacing and decidualization based on evidence from both animal and human studies. Progesterone and estrogen are two cholesterol-derived steroid hormones that synergistically mediate the structural and functional alterations in the uterus ready for blastocyst implantation. Variations in serum cholesterol profiles throughout the menstrual cycle imply a demand for steroidogenesis at the time of window of implantation (WOI). Since 2002, endometrial transcriptomic analysis has been serving as a diagnostic tool for WOI dating. Numerous genes that govern lipid homeostasis have been identified and, based on specific alterations of lipidomic signatures differentially expressed in WOI, lipidomic analysis of endometrial fluid provides a possibility for non-invasive diagnosis of lipids alterations during the WOI. WIDER IMPLICATIONS Given that lipid metabolic dysregulation potentially plays a role in infertility, a better understanding of lipid metabolism could have significant clinical implications for the diagnosis and treatment of female reproductive disorders.
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Affiliation(s)
- Tianli Yang
- Reproductive Medicine Center, Xiangya Hospital of Central South University, Changsha, P.R. China.,Clinical Research Center for Women's Reproductive Health in Hunan Province, Changsha, P.R. China
| | - Jing Zhao
- Reproductive Medicine Center, Xiangya Hospital of Central South University, Changsha, P.R. China.,Clinical Research Center for Women's Reproductive Health in Hunan Province, Changsha, P.R. China
| | - Feng Liu
- National Clinical Research Center for Metabolic Diseases, Metabolic Syndrome Research Center, and Key Laboratory of Diabetes Immunology, Ministry of Education, The Second Xiangya Hospital of Central South University, Changsha, P.R. China
| | - Yanping Li
- Reproductive Medicine Center, Xiangya Hospital of Central South University, Changsha, P.R. China.,Clinical Research Center for Women's Reproductive Health in Hunan Province, Changsha, P.R. China
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18
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HDL as Bidirectional Lipid Vectors: Time for New Paradigms. Biomedicines 2022; 10:biomedicines10051180. [PMID: 35625916 PMCID: PMC9138557 DOI: 10.3390/biomedicines10051180] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/10/2022] [Accepted: 05/13/2022] [Indexed: 02/06/2023] Open
Abstract
The anti-atherogenic properties of high-density lipoproteins (HDL) have been explained mainly by reverse cholesterol transport (RCT) from peripheral tissues to the liver. The RCT seems to agree with most of the negative epidemiological correlations between HDL cholesterol levels and coronary artery disease. However, therapies designed to increase HDL cholesterol failed to reduce cardiovascular risk, despite their capacity to improve cholesterol efflux, the first stage of RCT. Therefore, the cardioprotective role of HDL may not be explained by RCT, and it is time for new paradigms about the physiological function of these lipoproteins. It should be considered that the main HDL apolipoprotein, apo AI, has been highly conserved throughout evolution. Consequently, these lipoproteins play an essential physiological role beyond their capacity to protect against atherosclerosis. We propose HDL as bidirectional lipid vectors carrying lipids from and to tissues according to their local context. Lipid influx mediated by HDL appears to be particularly important for tissue repair right on site where the damage occurs, including arteries during the first stages of atherosclerosis. In contrast, the HDL-lipid efflux is relevant for secretory cells where the fusion of intracellular vesicles drastically enlarges the cytoplasmic membrane with the potential consequence of impairment of cell function. In such circumstances, HDL could deliver some functional lipids and pick up not only cholesterol but an integral part of the membrane in excess, restoring the viability of the secretory cells. This hypothesis is congruent with the beneficial effects of HDL against atherosclerosis as well as with their capacity to induce insulin secretion and merits experimental exploration.
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Abe RJ, Abe JI, Nguyen MTH, Olmsted-Davis EA, Mamun A, Banerjee P, Cooke JP, Fang L, Pownall H, Le NT. Free Cholesterol Bioavailability and Atherosclerosis. Curr Atheroscler Rep 2022; 24:323-336. [PMID: 35332444 PMCID: PMC9050774 DOI: 10.1007/s11883-022-01011-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/02/2022] [Indexed: 11/30/2022]
Abstract
PURPOSE OF REVIEW As both a cholesterol acceptor and carrier in the reverse cholesterol transport (RCT) pathway, high-density lipoprotein (HDL) is putatively atheroprotective. However, current pharmacological therapies to increase plasma HDL cholesterol (HDL-c) concentration have paradoxically failed to prevent or reduce atherosclerosis and cardiovascular disease (CVD). Given that free cholesterol (FC) transfer between surfaces of lipoproteins and cells is reversible, excess plasma FC can be transferred to the cells of peripheral tissue sites resulting in atherosclerosis. Here, we summarize potential mechanisms contributing to this paradox and highlight the role of excess free cholesterol (FC) bioavailability in atherosclerosis vs. atheroprotection. RECENT FINDINGS Recent findings have established a complex relationship between HDL-c concentration and atherosclerosis. Systemic scavenger receptor class B type 1 (SR-B1) knock out (KO) mice exhibit with increased diet-induced atherosclerosis despite having an elevated plasma HDL-c concentration compared to wild type (WT) mice. The greater bioavailability of HDL-FC in SR-B1 vs. WT mice is associated with a higher FC content in multiple cell types and tissue sites. These results suggest that dysfunctional HDL with high FC bioavailability is atheroprone despite high HDL-c concentration. Past oversimplification of HDL-c involvement in cholesterol transport has led to the failures in HDL targeted therapy. Evidence suggests that FC-mediated functionality of HDL is of higher importance than its quantity; as a result, deciphering the regulatory mechanisms by which HDL-FC bioavailability can induce atherosclerosis can have far-reaching clinical implications.
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Affiliation(s)
- Rei J Abe
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA
- Department of Physiology and Biophysics, Weill Cornell Medicine, New York, NY, USA
| | - Jun-Ichi Abe
- Department of Cardiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Minh T H Nguyen
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | | | - Abrar Mamun
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA
| | - Priyanka Banerjee
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA
| | - John P Cooke
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA
- Weill Cornell Medicine, New York, NY, USA
| | - Longhou Fang
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA
- Weill Cornell Medicine, New York, NY, USA
| | - Henry Pownall
- Weill Cornell Medicine, New York, NY, USA
- Center for Bioenergetics, Department of Medicine, Houston Methodist Research Institute, Houston, TX, USA
| | - Nhat-Tu Le
- Center for Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA.
- Weill Cornell Medicine, New York, NY, USA.
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Atherogenesis, Transcytosis, and the Transmural Cholesterol Flux: A Critical Review. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:2253478. [PMID: 35464770 PMCID: PMC9023196 DOI: 10.1155/2022/2253478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/19/2022] [Accepted: 03/23/2022] [Indexed: 11/17/2022]
Abstract
The recently described phenomenon of cholesterol-loaded low-density lipoproteins (LDL) entering the arterial wall from the lumen by transcytosis has been accepted as an alternative for the long-held concept that atherogenesis involves only passive LDL movement across an injured or dysfunctional endothelial barrier. This active transport of LDL can now adequately explain why plaques (atheromas) appear under an intact, uninjured endothelium. However, the LDL transcytosis hypothesis is still questionable, mainly because the process serves no clear physiological purpose. Moreover, central components of the putative LDL transcytosis apparatus are shared by the counter process of cholesterol efflux and reverse cholesterol transport (RCT) and therefore can essentially create an energy-wasting futile cycle and paradoxically be pro- and antiatherogenic simultaneously. Hence, by critically reviewing the literature, we wish to put forward an alternative interpretation that, in our opinion, better fits the experimental evidence. We assert that most of the accumulating cholesterol (mainly as LDL) reaches the intima not from the lumen by transcytosis, but from the artery's inner layers: the adventitia and media. We have named this directional cholesterol transport transmural cholesterol flux (TCF). We suggest that excess cholesterol, diffusing from the avascular (i.e., devoid of blood and lymph vessels) media's smooth muscle cells, is cleared by the endothelium through its apical membrane. A plaque is formed when this cholesterol clearance rate lags behind its rate of arrival by TCF.
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Liu T, Qu J, Tian M, Yang R, Song X, Li R, Yan J, Qiao J. Lipid Metabolic Process Involved in Oocyte Maturation During Folliculogenesis. Front Cell Dev Biol 2022; 10:806890. [PMID: 35433675 PMCID: PMC9009531 DOI: 10.3389/fcell.2022.806890] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 03/03/2022] [Indexed: 11/25/2022] Open
Abstract
Oocyte maturation is a complex and dynamic process regulated by the coordination of ovarian cells and numerous extraovarian signals. From mammal studies, it is learnt that lipid metabolism provides sufficient energy for morphological and cellular events during folliculogenesis, and numerous lipid metabolites, including cholesterol, lipoproteins, and 14-demethyl-14-dehydrolanosterol, act as steroid hormone precursors and meiotic resumption regulators. Endogenous and exogenous signals, such as gonadotropins, insulin, and cortisol, are the upstream regulators in follicular lipid metabolic homeostasis, forming a complex and dynamic network in which the key factor or pathway that plays the central role is still a mystery. Though lipid metabolites are indispensable, long-term exposure to a high-fat environment will induce irreversible damage to follicular cells and oocyte meiosis. This review specifically describes the transcriptional expression patterns of several lipid metabolism–related genes in human oocytes and granulosa cells during folliculogenesis, illustrating the spatiotemporal lipid metabolic changes in follicles and the role of lipid metabolism in female reproductive capacity. This study aims to elaborate the impact of lipid metabolism on folliculogenesis, thus providing guidance for improving the fertility of obese women and the clinical outcome of assisted reproduction.
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Affiliation(s)
- Tao Liu
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
| | - Jiangxue Qu
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
| | - Mengyuan Tian
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
| | - Rui Yang
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
| | - Xueling Song
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
| | - Rong Li
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
| | - Jie Yan
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
- *Correspondence: Jie Yan,
| | - Jie Qiao
- Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
- National Clinical Research Center for Obstetrics and Gynecology, Beijing, China
- Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
- Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing, China
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Al-Jarallah A, Babiker F. High Density Lipoprotein Reduces Blood Pressure and Protects Spontaneously Hypertensive Rats Against Myocardial Ischemia-Reperfusion Injury in an SR-BI Dependent Manner. Front Cardiovasc Med 2022; 9:825310. [PMID: 35387446 PMCID: PMC8977778 DOI: 10.3389/fcvm.2022.825310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/12/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundHypertension is a key risk factor in the development of cardiovascular diseases. Elevation in blood pressure alters high density lipoprotein (HDL) function and composition. The exact role of HDL in cardiovascular complications observed in hypertension is however not clearly understood. HDL protected against myocardial ischemia/reperfusion (I/R) injury in normotensive rats. Nonetheless, it's not clear if restoration of HDL function and/or composition protects against myocardial I/R injury in spontaneously hypertensive rats (SHR).ObjectivesIn this study we tested the effect of HDL treatment on I/R injury in Wistar Kyoto rats (WKY) and SHR and investigated the possible underlying mechanism(s).MethodsHDL (900 ng/kg/min) or vehicle were continuously administered to 11-week old WKY and SHR for 1 week (chronic treatment). Blood pressure was measured before and after treatment. Hearts were subjected to I/R injury using a modified Langendorff system. Another set of rats were treated with HDL administered at reperfusion (acute treatment) in the presence or absence of scavenger receptor class B type-I (SR-BI) blocking antibody. Cardiac hemodynamics were computed and cardiac enzyme release and infarct size were measured. Total cholesterol (TC) and HDL-cholesterol (HDL-C) were enzymatically assayed. Markers of autophagy and inflammation were detected by immunoblotting and ELISA, respectively.ResultsHDL treatment did not increase TC or HDL-C levels in SHR or WKY, yet it significantly (P < 0.01) reduced systolic and diastolic blood pressure in SHR. Chronic and acute HDL treatment significantly (P < 0.05) protected WKY and SHR against myocardial I/R injury. Chronic HDL treatment was significantly (P < 0.05) more protective in SHR whereas acute HDL treatment induced significantly (P < 0.05) greater protection in WKY. The extent of HDL induced protection was proportional to the expression levels of cardiac SR-BI and blockage of SR-BI completely abolished HDL mediated protection in SHR. Chronic HDL treatment significantly (P < 0.05) reduced markers of autophagy and inflammation in hypertensive rats.ConclusionsWe demonstrate a novel anti-hypertensive and a cardioprotective effect of HDL against myocardial I/R injury in SHR, the magnitude of which is directly related to the expression levels of cardiac SR-BI. Mechanistically, chronic HDL treatment protected SHR hearts by reducing autophagy and inflammation.
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Affiliation(s)
- Aishah Al-Jarallah
- Department of Biochemistry, Faculty of Medicine, Kuwait University, Kuwait City, Kuwait
- *Correspondence: Aishah Al-Jarallah
| | - Fawzi Babiker
- Department of Physiology, Faculty of Medicine, Kuwait University, Kuwait City, Kuwait
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Zeyneloglu HB, Tohma YA, Gunakan E, Abasıyanık MA, Sozen C, Onalan G. Diet and pravastatin administration prior to in vitro fertilization treatment may improve pregnancy outcome in women with dyslipidemia. J OBSTET GYNAECOL 2022; 42:2235-2240. [PMID: 35257641 DOI: 10.1080/01443615.2022.2036968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In this study, we aimed to identify whether using statins may increase the chance of pregnancy in In Vitro Fertilisation / Intra-Cytoplasmic Sperm Injection (IVF/ICSI) patients with hyperlipidaemia. Therefore, in this retrospective cohort study, 70 patients constituted the study population and all patients were managed by lipid lowering diet. Ten mg pravastatin (pravachol DEVA, Istanbul, Turkey) was added to therapy in case of resistant hypercholesterolaemia after 15 days of the diet. Fifty-one patients were treated with diet only and the remaining nineteen patients were offered both diet and pravastatin. Clinical pregnancy rate was significantly better with the patients who used pravastatin (68.4% vs. 39.2%, p = .029). Ongoing pregnancy rates were 63.2% and 33.3% with pravastatin and diet only, respectively, which were statistically significant (p:.024). According to multivariate analysis, pravastatin use was found independently and statistically significant for clinical pregnancy and ongoing pregnancy rate after IVF/ICSI in patients with dyslipidemia (HR 3.79; 95% CI 1.31-10.97; p:.014 and HR 3.18; 95% CI 1.22-8.27; p:.018). When we analysed stratified data according to the AMH levels, we noticed that as AMH levels increased, the pregnancy rates increased; the most benefit from pravastatin was in the group with AMH levels >2 ng/mL.IMPACT STATEMENTWhat is already known on this subject? Dyslipidemia in In IVF/ICSI patients with polycystic ovary syndrome had negative impact on pregnancy ratesWhat the results of this study add? The findings of the study support that pravastatin may help to improve pregnancy outcome, especially in normal and high responders, regardless of whether decreased serum LDL or total cholesterol level.What the implications are of these findings for clinical practice and/or further research? As a result of our data, we speculated that it should be routine to investigate the lipid profile in every IVF/ICSI patient and should be treated accordingly, if necessary.
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Affiliation(s)
- Hulusi Bulent Zeyneloglu
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Baskent University School of Medicine, Ankara, Turkey
| | - Yusuf Aytac Tohma
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Baskent University School of Medicine, Ankara, Turkey
| | - Emre Gunakan
- Department of Obstetrics and Gynecology, Baskent University School of Medicine, Ankara, Turkey
| | - Mehmet Ali Abasıyanık
- Department of Obstetrics and Gynecology, Baskent University School of Medicine, Ankara, Turkey
| | - Ceren Sozen
- Department of Obstetrics and Gynecology, Baskent University School of Medicine, Ankara, Turkey
| | - Gogsen Onalan
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Baskent University School of Medicine, Ankara, Turkey
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Hu S, Hu D, Wei H, Li SY, Wang D, Li CZ, Jiang J, Wang D, Cui G, Wang D. Functional Deletion/Insertion Promoter Variants in SCARB1 Associated With Increased Susceptibility to Lipid Profile Abnormalities and Coronary Heart Disease. Front Cardiovasc Med 2022; 8:800873. [PMID: 35097019 PMCID: PMC8793335 DOI: 10.3389/fcvm.2021.800873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Accepted: 12/20/2021] [Indexed: 12/12/2022] Open
Abstract
Background: Genetic variants in Scavenger receptor Class B Type 1 (SCARB1) influencing high-density lipoprotein cholesterol (HDL-C) and coronary heart disease (CHD) risk were identified by recent genome-wide association studies. Further study of potential functional variants in SCARB1 may provide new ideas of the complicated relationship between HDL-C and CHD. Methods: 2000 bp in SCARB1 promoter region was re-sequenced in 168 participants with extremely high plasma HDL-C and 400 control subjects. Putative risk alleles were identified using bioinformatics analysis and reporter-gene assays. Two indel variants, rs144334493 and rs557348251, respectively, were genotyped in 5,002 CHD patients and 5,175 control subjects. The underlying mechanisms were investigated. Results: Through resequencing, 27 genetic variants were identified. Results of genotyping in 5,002 CHD patients and 5,175 control subjects revealed that rs144334493 and rs557348251 were significantly associated with increased risk of CHD [odds ratio (OR): 1.28, 95% confidence interval (CI): 1.09 to 1.52, p = 0.003; OR: 2.65, 95% CI: 1.66–4.24, p = 4.4 × 10−5). Subsequent mechanism experiments demonstrated that rs144334493 deletion allele attenuated forkhead box A1 (FOXA1) binding to the promoter region of SCARB1, while FOXA1 overexpression reversely increased SR-BI expression. Conclusion: Genetic variants in SCARB1 promoter region significantly associated with the plasma lipid levels by affecting SR-BI expression and contribute to the susceptibility of CHD.
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Affiliation(s)
- Senlin Hu
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Dong Hu
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Haoran Wei
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Shi-yang Li
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Dong Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Chen-ze Li
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Jiangang Jiang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Daowen Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Guanglin Cui
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Province Key Laboratory of Genetics and Molecular Mechanisms of Cardiological Disorders, Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Guanglin Cui
| | - Daowu Wang
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine and Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
- Daowu Wang
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Chang X, Zhao Y, Qin S, Wang H, Wang B, Zhai L, Liu B, Gu HM, Zhang DW. Loss of Hepatic Surf4 Depletes Lipid Droplets in the Adrenal Cortex but Does Not Impair Adrenal Hormone Production. Front Cardiovasc Med 2021; 8:764024. [PMID: 34859075 PMCID: PMC8631933 DOI: 10.3389/fcvm.2021.764024] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 10/20/2021] [Indexed: 11/13/2022] Open
Abstract
The adrenal gland produces steroid hormones to play essential roles in regulating various physiological processes. Our previous studies showed that knockout of hepatic Surf4 (Surf4LKO) markedly reduced fasting plasma total cholesterol levels in adult mice, including low-density lipoprotein and high-density lipoprotein cholesterol. Here, we found that plasma cholesterol levels were also dramatically reduced in 4-week-old young mice and non-fasted adult mice. Circulating lipoprotein cholesterol is an important source of the substrate for the production of adrenal steroid hormones. Therefore, we investigated whether adrenal steroid hormone production was affected in Surf4LKO mice. We observed that lacking hepatic Surf4 essentially eliminated lipid droplets and significantly reduced cholesterol levels in the adrenal gland; however, plasma levels of aldosterone and corticosterone were comparable in Surf4LKO and the control mice under basal and stress conditions. Further analysis revealed that mRNA levels of genes encoding enzymes important for hormone synthesis were not altered, whereas the expression of scavenger receptor class B type I (SR-BI), low-density lipoprotein receptor (LDLR) and 3-hydroxy-3-methyl-glutaryl-CoA reductase was significantly increased in the adrenal gland of Surf4LKO mice, indicating increased de novo cholesterol biosynthesis and enhanced LDLR and SR-BI-mediated lipoprotein cholesterol uptake. We also observed that the nuclear form of SREBP2 was increased in the adrenal gland of Surf4 LKO mice. Taken together, these findings indicate that the very low levels of circulating lipoprotein cholesterol in Surf4LKO mice cause a significant reduction in adrenal cholesterol levels but do not significantly affect adrenal steroid hormone production. Reduced adrenal cholesterol levels activate SREBP2 and thus increase the expression of genes involved in cholesterol biosynthesis, which increases de novo cholesterol synthesis to compensate for the loss of circulating lipoprotein-derived cholesterol in the adrenal gland of Surf4LKO mice.
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Affiliation(s)
- Xiaole Chang
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Yongfang Zhao
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Shucun Qin
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Hao Wang
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Bingxiang Wang
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Lei Zhai
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Boyan Liu
- Institute of Atherosclerosis, College of Basic Medical Sciences, Shandong First Medical University, Shandong Academy of Medical Sciences, Tai'an, China
| | - Hong-Mei Gu
- Department of Pediatrics and Group on the Molecular and Cell Biology of Lipids, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Da-Wei Zhang
- Department of Pediatrics and Group on the Molecular and Cell Biology of Lipids, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
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26
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Casado ME, Huerta L, Marcos-Díaz A, Ortiz AI, Kraemer FB, Lasunción MA, Busto R, Martín-Hidalgo A. Hormone-sensitive lipase deficiency affects the expression of SR-BI, LDLr, and ABCA1 receptors/transporters involved in cellular cholesterol uptake and efflux and disturbs fertility in mouse testis. Biochim Biophys Acta Mol Cell Biol Lipids 2021; 1866:159043. [PMID: 34461308 DOI: 10.1016/j.bbalip.2021.159043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 12/14/2022]
Abstract
Hormone-sensitive lipase (HSL) hydrolyse acylglycerols, cholesteryl and retinyl esters. HSL is a key lipase in mice testis, as HSL deficiency results in male sterility. The present work study the effects of the deficiency and lack of HSL on the localization and expression of SR-BI, LDLr, and ABCA1 receptors/transporters involved in uptake and efflux of cholesterol in mice testis, to determine the impact of HSL gene dosage on testis morphology, lipid homeostasis and fertility. The results of this work show that the lack of HSL in mice alters testis morphology and spermatogenesis, decreasing sperm counts, sperm motility and increasing the amount of Leydig cells and lipid droplets. They also show that there are differences in the localization of HSL, SR-BI, LDLr and ABCA1 in HSL+/+, HSL+/- and HSL-/- mice. The deficiency or lack of HSL has effects on protein and mRNA expression of genes involved in lipid metabolisms in mouse testis. HSL-/- testis have augmented expression of SR-BI, LDLr, ABCA1 and LXRβ, a critical sterol sensor that regulate multiple genes involved in lipid metabolism; whereas LDLr expression decreased in HSL+/- mice. Plin2, Abca1 and Ldlr mRNA levels increased; and LXRα (Nr1h3) and LXRβ (Nr1h2) decreased in testis from HSL-/- compared with HSL+/+; with no differences in Scarb1. Together these data suggest that HSL deficiency or lack in mice testis induces lipid homeostasis alterations that affect the cellular localization and expression of key receptors/transporter involved in cellular cholesterol uptake and efflux (SR-BI, LDRr, ABCA1); alters normal cellular function and impact fertility.
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Affiliation(s)
- María Emilia Casado
- Servicio de Bioquímica-Investigación, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain; CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Spain
| | - Lydia Huerta
- Servicio de Bioquímica-Investigación, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain; CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Spain
| | - Ana Marcos-Díaz
- Servicio de Bioquímica-Investigación, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain; CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Spain
| | - Ana Isabel Ortiz
- Unidad de Cirugía Experimental y Animalario, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain
| | - Fredric B Kraemer
- Division of Endocrinology, Stanford University, United States of America; VA Palo Alto Health Care System, Palo Alto, CA, United States of America
| | - Miguel Angel Lasunción
- Servicio de Bioquímica-Investigación, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain; CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Spain
| | - Rebeca Busto
- Servicio de Bioquímica-Investigación, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain; CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Spain
| | - Antonia Martín-Hidalgo
- Servicio de Bioquímica-Investigación, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), E-28034 Madrid, Spain; CIBER de Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Spain.
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Nakanishi T, Tanaka R, Tonai S, Lee JY, Yamaoka M, Kawai T, Okamoto A, Shimada M, Yamashita Y. LH Induces De Novo Cholesterol Biosynthesis via SREBP Activation in Granulosa Cells During Ovulation in Female Mice. Endocrinology 2021; 162:6357690. [PMID: 34431998 DOI: 10.1210/endocr/bqab166] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Indexed: 12/22/2022]
Abstract
In the liver, the sterol response element binding protein (SREBP) and the SREBP cleavage-activated protein (SCAP) complex upregulate cholesterol biosynthesis by gene induction of de novo cholesterol synthetic enzymes (Hmgcr, Cyp51, and Dhcr7). Insulin induced gene 1 (INSIG1) negatively regulates cholesterol biosynthesis by the inhibition of de novo cholesterol biosynthetic gene expression. In the ovary, cholesterol is de novo synthesized; however, the roles of SREBP and its regulators (SCAP and INSIG1) are not well understood. In this study, when immature mice were treated with gonadotropins (eCG followed by hCG), eCG induced and hCG maintained the expression of SREBP-1a, -2, and SCAP granulosa cells, whereas INSIG1 expression was dramatically downregulated after hCG injection. Downregulation of INSIG1 led to generate the SREBPs active form and translocate the SREBPs active form to nuclei. Inhibition of generation of the SREBPs active form by fatostatin or Scap siRNA in both in vivo and in vitro significantly decreased the expressions of de novo cholesterol biosynthetic enzymes, cholesterol accumulation, and progesterone (P4) production compared with the control group. Fatostatin treatment inhibited the ovulation and increased the formation of abnormal corpus luteum which trapped the matured oocyte in the corpus luteum; however, the phenomenon was abolished by P4 administration. The results showed that decreasing INSIG1 level after hCG stimulation activated SREBP-induced de novo cholesterol biosynthesis in granulosa cells of preovulatory follicles, which is essential for P4 production and the rupture of matured oocyte during ovulation process.
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Affiliation(s)
- Tomoya Nakanishi
- Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
| | - Risa Tanaka
- Department of Bioresource Sciences, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
| | - Shingo Tonai
- Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
| | - Joo Yeon Lee
- Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
| | - Manami Yamaoka
- Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
| | - Tomoko Kawai
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 739-8528, Japan
| | - Asako Okamoto
- Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 739-8528, Japan
| | - Masayuki Shimada
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, 739-8528, Japan
| | - Yasuhisa Yamashita
- Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
- Department of Bioresource Sciences, Prefectural University of Hiroshima, Shobara, 727-0023, Japan
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28
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Abstract
Plasma HDL-cholesterol concentrations correlate negatively with the risk of atherosclerotic cardiovascular disease (ASCVD). According to a widely cited model, HDL elicits its atheroprotective effect through its role in reverse cholesterol transport, which comprises the efflux of cholesterol from macrophages to early forms of HDL, followed by the conversion of free cholesterol (FCh) contained in HDL into cholesteryl esters, which are hepatically extracted from the plasma by HDL receptors and transferred to the bile for intestinal excretion. Given that increasing plasma HDL-cholesterol levels by genetic approaches does not reduce the risk of ASCVD, the focus of research has shifted to HDL function, especially in the context of macrophage cholesterol efflux. In support of the reverse cholesterol transport model, several large studies have revealed an inverse correlation between macrophage cholesterol efflux to plasma HDL and ASCVD. However, other studies have cast doubt on the underlying reverse cholesterol transport mechanism: in mice and humans, the FCh contained in HDL is rapidly cleared from the plasma (within minutes), independently of esterification and HDL holoparticle uptake by the liver. Moreover, the reversibility of FCh transfer between macrophages and HDL has implicated the reverse process - that is, the transfer of FCh from HDL to macrophages - in the aetiology of increased ASCVD under conditions of very high plasma HDL-FCh concentrations.
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29
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Kluck GEG, Yoo JA, Sakarya EH, Trigatti BL. Good Cholesterol Gone Bad? HDL and COVID-19. Int J Mol Sci 2021; 22:10182. [PMID: 34638523 PMCID: PMC8507803 DOI: 10.3390/ijms221910182] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/15/2021] [Accepted: 09/17/2021] [Indexed: 02/06/2023] Open
Abstract
The transmissible respiratory disease COVID-19, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has affected millions of people worldwide since its first reported outbreak in December of 2019 in Wuhan, China. Since then, multiple studies have shown an inverse correlation between the levels of high-density lipoprotein (HDL) particles and the severity of COVID-19, with low HDL levels being associated with an increased risk of severe outcomes. Some studies revealed that HDL binds to SARS-CoV-2 particles via the virus's spike protein and, under certain conditions, such as low HDL particle concentrations, it facilitates SARS-CoV-2 binding to angiotensin-converting enzyme 2 (ACE2) and infection of host cells. Other studies, however, reported that HDL suppressed SARS-CoV-2 infection. In both cases, the ability of HDL to enhance or suppress virus infection appears to be dependent on the expression of the HDL receptor, namely, the Scavenger Receptor Class B type 1 (SR-B1), in the target cells. SR-B1 and HDL represent crucial mediators of cholesterol metabolism. Herein, we review the complex role of HDL and SR-B1 in SARS-CoV-2-induced disease. We also review recent advances in our understanding of HDL structure, properties, and function during SARS-CoV-2 infection and the resulting COVID-19 disease.
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Affiliation(s)
| | | | | | - Bernardo L. Trigatti
- Thrombosis and Atherosclerosis Research Institute and Department of Biochemistry and Biomedical Sciences, McMaster University and Hamilton Health Sciences, Hamilton, ON L8L 2X2, Canada; (G.E.G.K.); (J.-A.Y.); (E.H.S.)
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30
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Yang H, Chen L, Liu K, Li C, Li H, Xiong K, Li Z, Lu C, Chen W, Liu Y. Mendelian randomization rules out the causal relationship between serum lipids and cholecystitis. BMC Med Genomics 2021; 14:224. [PMID: 34535143 PMCID: PMC8447629 DOI: 10.1186/s12920-021-01082-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 09/07/2021] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND The relationship between serum lipids and cholecystitis is still under investigation. To examine the causal effect of serum lipids on cholecystitis using the Mendelian randomization method. METHODS We conducted univariable Mendelian randomization (MR) analyses using summary statistics from two independent genome-wide association studies (GWAS) on serum lipids (n = 132,908) and cholecystitis (n = 361,194). Mainly, the inverse-variance weighted (IVW) method was utilized to combine each SNP's causal estimation, and the MR-Egger was adopted as a complementary method, together with the weighted median. Cochrane's Q value was employed to appraise heterogeneity. The MR-Egger intercept and MR-PRESSO were used to detect the horizontal pleiotropy. RESULTS Our univariable results displayed a minor protective effect of serum low-density lipoprotein (LDL) cholesterol (OR [95% CI] = 0.9984483 [0.9984499, 0.9984468]; p = 0.008) on cholecystitis. No significant causal effect of total cholesterol (TC) (OR [95% CI] = 0.9994228 [0.9994222, 0.9994233]; p = 0.296), triglycerides (OR [95% CI] = 0.9990893 [0.9990882, 0.9990903]; p = 0.238) and high-density lipoprotein (HDL) cholesterol (OR [95% CI] = 0.9997020 [0.9997017, 0.9997023]; p = 0.565) was found on cholecystitis. CONCLUSION These findings suggest that LDL cholesterolhas a slight protective effect on cholecystitis, which can be easily affected by confounding factors. TC, triglycerides and HDL cholesterol don't have causal effect on cholecystitis. The protective effect of serum lipids on cholecystitis, though possible, remain less certain.
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Affiliation(s)
- Hongqun Yang
- Secondary Department of Hepatobiliary and Pancreatic Surgery, The First Hospital of Jilin University, Changchun, 130021, China
| | - Lanlan Chen
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Kaiyu Liu
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Chengnan Li
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Haitao Li
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Kezhen Xiong
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Zehan Li
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Chuang Lu
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Wei Chen
- Clinical Medical School, Jilin University, Changchun, 130021, Jilin, China
| | - Yahui Liu
- Secondary Department of Hepatobiliary and Pancreatic Surgery, The First Hospital of Jilin University, Changchun, 130021, China.
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31
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Baranova IN, Bocharov AV, Vishnyakova TG, Chen Z, Birukova AA, Ke Y, Hu X, Yuen PST, Star RA, Birukov KG, Patterson AP, Eggerman TL. Class B Scavenger Receptors BI and BII Protect against LPS-Induced Acute Lung Injury in Mice by Mediating LPS. Infect Immun 2021; 89:e0030121. [PMID: 34097506 PMCID: PMC8445172 DOI: 10.1128/iai.00301-21] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 05/28/2021] [Indexed: 12/15/2022] Open
Abstract
Recent studies suggest an anti-inflammatory protective role for class B scavenger receptor BI (SR-BI) in endotoxin-induced inflammation and sepsis. Other data, including ours, provide evidence for an alternative role of SR-BI, facilitating bacterial and endotoxin uptake and contributing to inflammation and bacterial infection. Enhanced endotoxin susceptibility of SR-BI-deficient mice due to their anti-inflammatory glucocorticoid deficiency complicates the understanding of SR-BI's role in endotoxemia/sepsis, calling for the use of alternative models. In this study, using human SR-BI (hSR-BI) and hSR-BII transgenic mice, we found that SR-BI and, to a lesser extent, its splicing variant SR-BII protect against LPS-induced lung damage. At 20 h after intratracheal LPS instillation, the extent of pulmonary inflammation and vascular leakage was significantly lower in hSR-BI and hSR-BII transgenic mice than in wild-type mice. Higher bronchoalveolar lavage fluid (BALF) inflammatory cell count and protein content and lung tissue neutrophil infiltration found in wild-type mice were associated with markedly (2 to 3 times) increased proinflammatory cytokine production compared to these parameters in transgenic mice following LPS administration. The markedly lower endotoxin levels detected in BALF of transgenic versus wild-type mice and the significantly increased BODIPY-LPS uptake observed in lungs of hSR-BI and hSR-BII mice 20 h after the i.t. LPS injection suggest that hSR-BI- and hSR-BII-mediated enhanced LPS clearance in the airways could represent the mechanism of their protective role against LPS-induced acute lung injury.
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Affiliation(s)
- Irina N. Baranova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Alexander V. Bocharov
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Tatyana G. Vishnyakova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Zhigang Chen
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Anna A. Birukova
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Yunbo Ke
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Xuzhen Hu
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Peter S. T. Yuen
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Robert A. Star
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Konstantin G. Birukov
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Amy P. Patterson
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
- National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Thomas L. Eggerman
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
- National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
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32
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Koenig SN, Sucharski HC, Jose EM, Dudley EK, Madiai F, Cavus O, Argall AD, Williams JL, Murphy NP, Keith CBR, Refaey ME, Gumina RJ, Boudoulas KD, Milks MW, Sofowora G, Smith SA, Hund TJ, Wright NT, Bradley EA, Zareba KM, Wold LE, Mazzaferri EL, Mohler PJ. Inherited Variants in SCARB1 Cause Severe Early-Onset Coronary Artery Disease. Circ Res 2021; 129:296-307. [PMID: 33975440 PMCID: PMC8273129 DOI: 10.1161/circresaha.120.318793] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 05/10/2021] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Sara N. Koenig
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Holly C. Sucharski
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Elizabeth M. Jose
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Emma K. Dudley
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Francesca Madiai
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Omer Cavus
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Aaron D. Argall
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Jordan L. Williams
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Nathaniel P. Murphy
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Caullin B. R. Keith
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Mona El Refaey
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Richard J. Gumina
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Konstantinos D. Boudoulas
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - M. Wesley Milks
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Gbemiga Sofowora
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Sakima A. Smith
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Thomas J. Hund
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
| | - Nathan T. Wright
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, VA 22807
| | - Elisa A. Bradley
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Karolina M. Zareba
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Loren E. Wold
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
- College of Nursing, The Ohio State University, Columbus, OH 43210
| | - Ernest L. Mazzaferri
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
| | - Peter J. Mohler
- Dorothy M. Davis Heart and Lung Research Institute and Frick Center for Heart Failure and Arrhythmia Research, The Ohio State University, Columbus, OH 43210
- Department of Physiology and Cell Biology, The Ohio State University, Columbus, OH 43210
- Ross Heart Hospital, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH 43210
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Quiroz A, Molina P, Santander N, Gallardo D, Rigotti A, Busso D. Ovarian cholesterol efflux: ATP-binding cassette transporters and follicular fluid HDL regulate cholesterol content in mouse oocytes†. Biol Reprod 2021; 102:348-361. [PMID: 31423535 DOI: 10.1093/biolre/ioz159] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 10/30/2019] [Accepted: 08/10/2019] [Indexed: 11/13/2022] Open
Abstract
High density lipoproteins (HDL) take up cholesterol from peripheral tissues via ABC transporters and deliver it to the liver via scavenger receptor class B type I (SR-B1). HDL are the main lipoproteins present in follicular fluid (FF). They are thought to derive from plasma, but their origin is still controversial. SR-B1 knock-out (KO) mice have provided important evidence linking HDL metabolism and female fertility. These mice have cholesterol-rich circulating HDL and female infertility that can be restored by treating mice with the cholesterol-lowering drug probucol. Ovulated oocytes from SR-B1 KO females are dysfunctional and show excess cholesterol. The mechanisms explaining the contribution of FF HDL to oocyte cholesterol homeostasis are unknown. Here, using quantitation of filipin fluorescence we show that in SR-B1 KO ovaries, cholesterol excess is first observed in immature oocytes in antral follicles. By performing cross-transplant experiments between WT and apolipoprotein A-I deficient (ApoA-I KO) mice, which lack the main protein component of HDL, we provide evidence supporting the plasmatic origin of FF HDL. Also, we demonstrate that probucol treatment in SR-B1 KO females results in lowering of cholesterol content in their oocytes. Incubation of oocytes from SR-B1 KO mice with purified WT HDL reduces their cholesterol content, suggesting that HDL promote efflux of excess cholesterol from oocytes. In agreement with this hypothesis, we identified ABC transporters in oocytes and observed that ABCA1 KO oocytes have excess cholesterol and lower viability than WT oocytes.
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Affiliation(s)
- Alonso Quiroz
- Department of Nutrition, Diabetes and Metabolism, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Paz Molina
- Department of Nutrition, Diabetes and Metabolism, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nicolás Santander
- Department of Nutrition, Diabetes and Metabolism, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Daniel Gallardo
- Department of Nutrition, Diabetes and Metabolism, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Attilio Rigotti
- Department of Nutrition, Diabetes and Metabolism, Pontificia Universidad Católica de Chile, Santiago, Chile.,Center of Molecular Nutrition and Chronic Diseases, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Dolores Busso
- Department of Nutrition, Diabetes and Metabolism, Pontificia Universidad Católica de Chile, Santiago, Chile
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34
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May SC, Dron JS, Hegele RA, Sahoo D. Human variant of scavenger receptor BI (R174C) exhibits impaired cholesterol transport functions. J Lipid Res 2021; 62:100045. [PMID: 33577783 PMCID: PMC7985710 DOI: 10.1016/j.jlr.2021.100045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 01/22/2021] [Indexed: 11/29/2022] Open
Abstract
HDL and its primary receptor, scavenger receptor class B type I (SR-BI), work together to promote the clearance of excess plasma cholesterol, thereby protecting against atherosclerosis. Human variants of SR-BI have been identified in patients with high HDL-cholesterol levels, and at least one variant has been linked to cardiovascular disease. Therefore, while often regarded as beneficial, very high levels of HDL-cholesterol may result from impaired cholesterol clearance through SR-BI and contribute to cardiovascular risk. In this study, we characterized the function of a rare human variant of SR-BI, resulting in the substitution of arginine-174 with cysteine (R174C), which was previously identified in a heterozygous individual with high levels of HDL-cholesterol. We hypothesized that the R174C-SR-BI variant has impaired cholesterol transport functions, which were assessed in COS-7 cells after transient transfection with full-length WT or R174C-SR-BI. Although R174C-SR-BI was expressed at levels comparable to the WT receptor, HDL binding, cholesteryl hexadecyl ether uptake, free cholesterol efflux, and modulation of membrane cholesterol were disrupted in the presence of R174C-SR-BI. We further examined the role of salt bridges as a potential mechanism for R174C-SR-BI dysfunction. If translatable, this human variant could lead to increased plasma HDL-cholesterol levels, impaired cholesterol clearance, and increased cardiovascular disease risk.
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Affiliation(s)
- Sarah C May
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Jacqueline S Dron
- Robarts Research Institute, Western University, London, Ontario, Canada; Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Robert A Hegele
- Robarts Research Institute, Western University, London, Ontario, Canada; Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada; Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Daisy Sahoo
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, USA; Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, USA; Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA.
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35
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Mineo C. Lipoprotein receptor signalling in atherosclerosis. Cardiovasc Res 2021; 116:1254-1274. [PMID: 31834409 DOI: 10.1093/cvr/cvz338] [Citation(s) in RCA: 87] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/01/2019] [Accepted: 12/10/2019] [Indexed: 12/11/2022] Open
Abstract
The founding member of the lipoprotein receptor family, low-density lipoprotein receptor (LDLR) plays a major role in the atherogenesis through the receptor-mediated endocytosis of LDL particles and regulation of cholesterol homeostasis. Since the discovery of the LDLR, many other structurally and functionally related receptors have been identified, which include low-density lipoprotein receptor-related protein (LRP)1, LRP5, LRP6, very low-density lipoprotein receptor, and apolipoprotein E receptor 2. The scavenger receptor family members, on the other hand, constitute a family of pattern recognition proteins that are structurally diverse and recognize a wide array of ligands, including oxidized LDL. Among these are cluster of differentiation 36, scavenger receptor class B type I and lectin-like oxidized low-density lipoprotein receptor-1. In addition to the initially assigned role as a mediator of the uptake of macromolecules into the cell, a large number of studies in cultured cells and in in vivo animal models have revealed that these lipoprotein receptors participate in signal transduction to modulate cellular functions. This review highlights the signalling pathways by which these receptors influence the process of atherosclerosis development, focusing on their roles in the vascular cells, such as macrophages, endothelial cells, smooth muscle cells, and platelets. Human genetics of the receptors is also discussed to further provide the relevance to cardiovascular disease risks in humans. Further knowledge of the vascular biology of the lipoprotein receptors and their ligands will potentially enhance our ability to harness the mechanism to develop novel prophylactic and therapeutic strategies against cardiovascular diseases.
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Affiliation(s)
- Chieko Mineo
- Department of Pediatrics and Cell Biology, Center for Pulmonary and Vascular Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9063, USA
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36
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Abstract
Purpose of the Review To evaluate recent studies related to the paradox of high HDL-C with mortality and atherosclerotic cardiovascular disease (ASCVD) risk. Recent Findings Two observational studies (Cardiovascular Health in Ambulatory Care Research Team [CANHEART] and Copenhagen City Heart Study and the Copenhagen General Population Study [Copenhagen Heart Studies]) of adults without pre-existing ASCVD have shown a significant U-shaped association of HDL-C with all-cause and cause-specific mortality. Both studies showed that low HDL-C levels consistently increased hazard risk (HR) for all-cause and cause-specific mortality. In the CANHEART study, high HDL-C levels, HDL-C > 90 mg/dL, were associated with increased HR for non-CVD/non-cancer mortality. In the Copenhagen Heart Studies, women with HDL-C ≥ 135 mg/dL showed increased HR for all-cause and CVD mortality, while men with HDL-C > 97 mg/dL showed increased HR for all-cause and CVD mortality. Genetic association studies failed to show that genetic etiologies of high HDL-C significantly reduced risk for myocardial infarction (MI), while hepatocyte nuclear factor-4 (HNF4A) was significantly associated with high HDL-C and increased MI risk. Candidate gene studies have identified scavenger receptor B class I (SCARB1) and lymphocyte activation gene-3 (LAG3) as genes significantly associated with high HDL-C and increased MI risk. Summary Low HDL-C remains as a significant factor for increased disease risk while high HDL-C levels are not associated with cardioprotection. Clinical CVD risk calculators need revision.
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Affiliation(s)
- Annabelle Rodriguez
- Cell Biology, Linda and David Roth Chair of Cardiovascular Health, Center for Vascular Biology, University of Connecticut Health, 263 Farmington Avenue, Farmington, CT, 06030, USA.
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37
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Golforoush P, Yellon DM, Davidson SM. Mouse models of atherosclerosis and their suitability for the study of myocardial infarction. Basic Res Cardiol 2020; 115:73. [PMID: 33258000 PMCID: PMC7704510 DOI: 10.1007/s00395-020-00829-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/28/2020] [Indexed: 12/17/2022]
Abstract
Atherosclerotic plaques impair vascular function and can lead to arterial obstruction and tissue ischaemia. Rupture of an atherosclerotic plaque within a coronary artery can result in an acute myocardial infarction, which is responsible for significant morbidity and mortality worldwide. Prompt reperfusion can salvage some of the ischaemic territory, but ischaemia and reperfusion (IR) still causes substantial injury and is, therefore, a therapeutic target for further infarct limitation. Numerous cardioprotective strategies have been identified that can limit IR injury in animal models, but none have yet been translated effectively to patients. This disconnect prompts an urgent re-examination of the experimental models used to study IR. Since coronary atherosclerosis is the most prevalent morbidity in this patient population, and impairs coronary vessel function, it is potentially a major confounder in cardioprotective studies. Surprisingly, most studies suggest that atherosclerosis does not have a major impact on cardioprotection in mouse models. However, a major limitation of atherosclerotic animal models is that the plaques usually manifest in the aorta and proximal great vessels, and rarely in the coronary vessels. In this review, we examine the commonly used mouse models of atherosclerosis and their effect on coronary artery function and infarct size. We conclude that none of the commonly used strains of mice are ideal for this purpose; however, more recently developed mouse models of atherosclerosis fulfil the requirement for coronary artery lesions, plaque rupture and lipoprotein patterns resembling the human profile, and may enable the identification of therapeutic interventions more applicable in the clinical setting.
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MESH Headings
- Animals
- Aortic Diseases/complications
- Aortic Diseases/genetics
- Aortic Diseases/metabolism
- Aortic Diseases/pathology
- Atherosclerosis/complications
- Atherosclerosis/genetics
- Atherosclerosis/metabolism
- Atherosclerosis/pathology
- Coronary Artery Disease/complications
- Coronary Artery Disease/genetics
- Coronary Artery Disease/metabolism
- Coronary Artery Disease/pathology
- Diet, High-Fat
- Disease Models, Animal
- Genetic Predisposition to Disease
- Mice, Knockout, ApoE
- Myocardial Infarction/etiology
- Myocardial Infarction/genetics
- Myocardial Infarction/metabolism
- Myocardial Infarction/pathology
- Myocardium/pathology
- Phenotype
- Plaque, Atherosclerotic
- Receptors, LDL/deficiency
- Receptors, LDL/genetics
- Rupture, Spontaneous
- Scavenger Receptors, Class B/deficiency
- Scavenger Receptors, Class B/genetics
- Species Specificity
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Affiliation(s)
- Pelin Golforoush
- The Hatter Cardiovascular Institute, 67 Chenies Mews, London, WC1E 6HX, UK
| | - Derek M Yellon
- The Hatter Cardiovascular Institute, 67 Chenies Mews, London, WC1E 6HX, UK
| | - Sean M Davidson
- The Hatter Cardiovascular Institute, 67 Chenies Mews, London, WC1E 6HX, UK.
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38
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Khan HS, Nair VR, Ruhl CR, Alvarez-Arguedas S, Galvan Rendiz JL, Franco LH, Huang L, Shaul PW, Kim J, Xie Y, Mitchell RB, Shiloh MU. Identification of scavenger receptor B1 as the airway microfold cell receptor for Mycobacterium tuberculosis. eLife 2020; 9:52551. [PMID: 32134383 PMCID: PMC7065847 DOI: 10.7554/elife.52551] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 03/04/2020] [Indexed: 12/19/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) can enter the body through multiple routes, including via specialized transcytotic cells called microfold cells (M cell). However, the mechanistic basis for M cell entry remains undefined. Here, we show that M cell transcytosis depends on the Mtb Type VII secretion machine and its major virulence factor EsxA. We identify scavenger receptor B1 (SR-B1) as an EsxA receptor on airway M cells. SR-B1 is required for Mtb binding to and translocation across M cells in mouse and human tissue. Together, our data demonstrate a previously undescribed role for Mtb EsxA in mucosal invasion and identify SR-B1 as the airway M cell receptor for Mtb.
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Affiliation(s)
- Haaris S Khan
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States
| | - Vidhya R Nair
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States
| | - Cody R Ruhl
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States
| | - Samuel Alvarez-Arguedas
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States
| | - Jorge L Galvan Rendiz
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States
| | - Luis H Franco
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States
| | - Linzhang Huang
- Center for Pulmonary and Vascular Biology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, United States
| | - Philip W Shaul
- Center for Pulmonary and Vascular Biology, Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, United States
| | - Jiwoong Kim
- Quantitative Biomedical Research Center, Department of Population and Data Sciences, University of Texas Southwestern Medical Center, Dallas, United States
| | - Yang Xie
- Quantitative Biomedical Research Center, Department of Population and Data Sciences, University of Texas Southwestern Medical Center, Dallas, United States.,Harold C Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, United States.,Department of Bioinformatics, University of Texas Southwestern Medical Center, Dallas, United States
| | - Ron B Mitchell
- Department of Otolaryngology, University of Texas Southwestern Medical Center, Dallas, United States
| | - Michael U Shiloh
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, United States.,Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, United States
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39
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Singh AB, Dong B, Kraemer FB, Liu J. FXR activation promotes intestinal cholesterol excretion and attenuates hyperlipidemia in SR-B1-deficient mice fed a high-fat and high-cholesterol diet. Physiol Rep 2020; 8:e14387. [PMID: 32170842 PMCID: PMC7070099 DOI: 10.14814/phy2.14387] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 01/27/2020] [Accepted: 01/28/2020] [Indexed: 12/14/2022] Open
Abstract
Obeticholic acid (OCA) activates the farnesoid X receptor (FXR) to lower circulating total cholesterol (TC) and high density lipoprotein-cholesterol (HDL-C) concentrations and to stimulate fecal cholesterol excretion in mice by increasing hepatic SR-B1 expression. Here we show that hepatic SR-B1 depletion by an adenovirus expressing Sr-b1 shRNA (Ad-shSR-B1) attenuated these beneficial effects of OCA in mice on a chow diet. The mRNA levels of ABC cholesterol transporter genes (Abca1, Abcg1, Abcg5, and Abcg8) were unchanged in the liver of hepatic SR-B1-depleted mice regardless of OCA treatment; however, a modest increase in Abca1, Abcg5, and Abcg8 mRNA levels was observed in the ileum of vehicle-treated control mice and Abca1 and Abcg8 mRNA levels were increased more by OCA administration. OCA treatment of Sr-b1 knock out (KO) mice (Sr-b1-/-) fed a normal chow diet (NCD) displayed a similar lack of transhepatic cholesterol movement, as well as a modest increase in the levels of ileum cholesterol transporter expression. However, OCA treatment of Sr-b1 KO mice fed a cholesterol-enriched diet reduced circulating cholesterol and increased fecal cholesterol output to comparable degrees to that of wild-type (WT) mice, and these effects were accompanied by substantial elevations of mRNA levels of Abca1, Abcg1, Abcg5, and Abcg8 in the ileum of Sr-b1 KO mice. Our studies suggest that FXR activation stimulates intestinal cholesterol excretion and reduces diet-induced hyperlipidemia through increased expression of ileal cholesterol transporters when hepatic SR-B1-mediated cholesterol movement is absent.
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Affiliation(s)
- Amar B. Singh
- Veterans Affairs Palo Alto Health Care SystemPalo AltoCAUSA
| | - Bin Dong
- Veterans Affairs Palo Alto Health Care SystemPalo AltoCAUSA
| | - Fredric B. Kraemer
- Veterans Affairs Palo Alto Health Care SystemPalo AltoCAUSA
- Department of MedicineStanford University School of MedicineStanfordCAUSA
| | - Jingwen Liu
- Veterans Affairs Palo Alto Health Care SystemPalo AltoCAUSA
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40
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Wang D, Huang J, Gui T, Yang Y, Feng T, Tzvetkov NT, Xu T, Gai Z, Zhou Y, Zhang J, Atanasov AG. SR-BI as a target of natural products and its significance in cancer. Semin Cancer Biol 2020; 80:18-38. [PMID: 31935456 DOI: 10.1016/j.semcancer.2019.12.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/25/2019] [Accepted: 12/30/2019] [Indexed: 02/07/2023]
Abstract
Scavenger receptor class B type I (SR-BI) protein is an integral membrane glycoprotein. SR-BI is emerging as a multifunctional protein, which regulates autophagy, efferocytosis, cell survival and inflammation. It is well known that SR-BI plays a critical role in lipoprotein metabolism by mediating cholesteryl esters selective uptake and the bi-directional flux of free cholesterol. Recently, SR-BI has also been identified as a potential marker for cancer diagnosis, prognosis, or even a treatment target. Natural products are a promising source for the discovery of new drug leads. Multiple natural products were identified to regulate SR-BI protein expression. There are still a number of challenges in modulating SR-BI expression in cancer and in using natural products for modulation of such protein expression. In this review, our purpose is to discuss the relationship between SR-BI protein and cancer, and the molecular mechanisms regulating SR-BI expression, as well as to provide an overview of natural products that regulate SR-BI expression.
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Affiliation(s)
- Dongdong Wang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Jiansheng Huang
- Department of Medicine, Vanderbilt University Medical Center, 318 Preston Research Building, 2200 Pierce Avenue, Nashville, Tennessee, 37232, USA
| | - Ting Gui
- Key Laboratory of Traditional Chinese Medicine for Classical Theory, Ministry of Education, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Yaxin Yang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Tingting Feng
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Huaxi university town, 550025, Guiyang, China
| | - Nikolay T Tzvetkov
- Department of Biochemical Pharmacology and Drug Design, Institute of Molecular Biology "Roumen Tsanev", Bulgarian Academy of Sciences, 21 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - Tao Xu
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Zhibo Gai
- Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ying Zhou
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Huaxi university town, 550025, Guiyang, China.
| | - Jingjie Zhang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China.
| | - Atanas G Atanasov
- Department of Molecular Biology, Institute of Genetics and Animal Breeding of the Polish Academy of Sciences, 05-552, Jastrzębiec, Poland; Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria; Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria; Ludwig Boltzmann Institute for Digital Health and Patient Safety, Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria.
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41
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Helgadottir A, Sulem P, Thorgeirsson G, Gretarsdottir S, Thorleifsson G, Jensson BÖ, Arnadottir GA, Olafsson I, Eyjolfsson GI, Sigurdardottir O, Thorsteinsdottir U, Gudbjartsson DF, Holm H, Stefansson K. Rare SCARB1 mutations associate with high-density lipoprotein cholesterol but not with coronary artery disease. Eur Heart J 2019; 39:2172-2178. [PMID: 29596577 PMCID: PMC6001888 DOI: 10.1093/eurheartj/ehy169] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 03/14/2018] [Indexed: 12/16/2022] Open
Abstract
Aims Scavenger receptor Class B Type 1 (SR-BI) is a major receptor for high-density lipoprotein (HDL) that promotes hepatic uptake of cholesterol from HDL. A rare mutation p.P376L, in the gene encoding SR-BI, SCARB1, was recently reported to associate with elevated HDL cholesterol (HDL-C) and increased risk of coronary artery disease (CAD), suggesting that increased HDL-C caused by SR-BI impairment might be an independent marker of cardiovascular risk. We tested the hypothesis that alleles in or close to SCARB1 that associate with elevated levels of HDL-C also associate with increased risk of CAD in the relatively homogeneous population of Iceland. Methods and results Using a large resource of whole-genome sequenced Icelanders, we identified thirteen SCARB1 coding mutations that we examined for association with HDL-C (n = 136 672). Three rare SCARB1 mutations, encoding p.G319V, p.V111M, and p.V32M (combined allelic frequency = 0.2%) associate with elevated levels of HDL-C (p.G319V: β = 11.1 mg/dL, P = 8.0 × 10−7; p.V111M: β = 8.3 mg/dL, P = 1.1 × 10−6; p.V32M: β = 10.2 mg/dL, P = 8.1 × 10−4). These mutations do not associate with CAD (36 886 cases/306 268 controls) (odds ratio = 0.90, 95% confidence interval 0.67–1.22, P = 0.49), despite effects on HDL-C comparable to that reported for p.P376L, both in terms of direction and magnitude. Furthermore, HDL-C raising alleles of three common SCARB1 non-coding variants, including one previously unreported (rs61941676-C: β = 1.25 mg/dL, P = 1.7 × 10−18), and of one low frequency coding variant (p.V135I) that independently associate with higher HDL-C, do not confer increased risk of CAD. Conclusion Elevated HDL-C due to genetically compromised SR-BI function is not a marker of CAD risk. ![]()
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Affiliation(s)
- Anna Helgadottir
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland
| | - Patrick Sulem
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland
| | - Gudmundur Thorgeirsson
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland.,Faculty of Medicine, Department of Medicine, University of Iceland, Saemundargata 2, 101 Reykjavik, Iceland.,Division of Cardiology, Department of Internal Medicine, Landspitali, National University Hospital of Iceland, Hringbraut, 101 Reykjavik, Iceland
| | | | | | | | | | - Isleifur Olafsson
- Department of Clinical Biochemistry, Landspitali, National University Hospital, Hringbraut, 101 Reykjavik, Iceland
| | | | - Olof Sigurdardottir
- Department of Clinical Biochemistry, Akureyri Hospital, 600 Akureyri, Iceland
| | - Unnur Thorsteinsdottir
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland.,Faculty of Medicine, Department of Medicine, University of Iceland, Saemundargata 2, 101 Reykjavik, Iceland
| | - Daniel F Gudbjartsson
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland.,School of Engineering and Natural Sciences, University of Iceland, 101 Reykjavik, Iceland
| | - Hilma Holm
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland
| | - Kari Stefansson
- deCODE Genetics/Amgen, Inc., Sturlugata 8, 101 Reykjavik, Iceland.,Faculty of Medicine, Department of Medicine, University of Iceland, Saemundargata 2, 101 Reykjavik, Iceland
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42
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Ghaffari S, Naderi Nabi F, Sugiyama MG, Lee WL. Estrogen Inhibits LDL (Low-Density Lipoprotein) Transcytosis by Human Coronary Artery Endothelial Cells via GPER (G-Protein-Coupled Estrogen Receptor) and SR-BI (Scavenger Receptor Class B Type 1). Arterioscler Thromb Vasc Biol 2019; 38:2283-2294. [PMID: 30354216 DOI: 10.1161/atvbaha.118.310792] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Objective- The atheroprotective effects of estrogen are independent of circulating lipid levels. Whether estrogen regulates transcytosis of LDL (low-density lipoprotein) across the coronary endothelium is unknown. Approach and Results- Using total internal reflection fluorescence microscopy, we quantified transcytosis of LDL across human coronary artery endothelial cells from multiple donors. LDL transcytosis was significantly higher in cells from men compared with premenopausal women. Estrogen significantly attenuated LDL transcytosis by endothelial cells from male but not female donors; transcytosis of albumin was not affected. Estrogen caused downregulation of endothelial SR-BI (scavenger receptor class B type 1), and overexpression of SR-BI was sufficient to restore LDL transcytosis. Similarly, depletion of SR-BI by siRNA attenuated endothelial LDL transcytosis and prevented any further effect of estrogen. In contrast, treatment with estrogen had no effect on SR-BI expression by liver cells. Inhibition of estrogen receptors α and β had no effect on estrogen-mediated attenuation of LDL transcytosis. However, estrogen's effect on LDL transcytosis was blocked by depletion of the GPER (G-protein-coupled estrogen receptor). GPER was found to be enriched in endothelial cells compared with hepatocytes and is reported to signal via transactivation of the EGFR (epidermal growth factor receptor); inhibition of EGFR prevented the effect of estrogen on LDL transcytosis and SR-BI mRNA. Last, SR-BI expression was significantly higher in human coronary artery endothelial cells from male compared with premenopausal female donors. Conclusions- Estrogen significantly inhibits LDL transcytosis by downregulating endothelial SR-BI; this effect requires GPER.
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Affiliation(s)
- Siavash Ghaffari
- From the Keenan Centre for Biomedical Research, St. Michael's Hospital, Toronto, Canada (S.G., F.N.N., M.G.S., W.L.L.)
| | - Farnoosh Naderi Nabi
- From the Keenan Centre for Biomedical Research, St. Michael's Hospital, Toronto, Canada (S.G., F.N.N., M.G.S., W.L.L.).,Department of Laboratory Medicine and Pathobiology (F.N.N., M.G.S., W.L.L.), University of Toronto, Canada
| | - Michael G Sugiyama
- From the Keenan Centre for Biomedical Research, St. Michael's Hospital, Toronto, Canada (S.G., F.N.N., M.G.S., W.L.L.).,Department of Laboratory Medicine and Pathobiology (F.N.N., M.G.S., W.L.L.), University of Toronto, Canada
| | - Warren L Lee
- From the Keenan Centre for Biomedical Research, St. Michael's Hospital, Toronto, Canada (S.G., F.N.N., M.G.S., W.L.L.).,Department of Laboratory Medicine and Pathobiology (F.N.N., M.G.S., W.L.L.), University of Toronto, Canada.,Division of Critical Care, Department of Medicine (W.L.L.), University of Toronto, Canada.,Department of Biochemistry (W.L.L.), University of Toronto, Canada.,Institute of Medical Science (W.L.L.), University of Toronto, Canada
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43
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Durham KK, Kluck G, Mak KC, Deng YD, Trigatti BL. Treatment with apolipoprotein A1 protects mice against doxorubicin-induced cardiotoxicity in a scavenger receptor class B, type I-dependent manner. Am J Physiol Heart Circ Physiol 2019; 316:H1447-H1457. [DOI: 10.1152/ajpheart.00432.2018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Doxorubicin, an agent used to treat a variety of cancers, is cardiotoxic by triggering cardiomyocyte apoptosis. We previously showed that treating cultured cardiomyocytes with human high-density lipoprotein in vitro or transgenic overexpression of human apolipoprotein A1, its main structural protein, protects against doxorubicin-induced cardiomyocyte apoptosis in a manner dependent on the scavenger receptor class B type I [Durham KK, Chathely KM, Mak KC, Momen A, Thomas CT, Zhao YY, MacDonald ME, Curtis JM, Husain M, Trigatti BL. HDL protects against doxorubicin-induced cardiotoxicity in a scavenger receptor class B type 1-, phosphatidylinositol 3-kinase-, and Akt-dependent manner. Am J Physiol Heart Circ Physiol 314: H31–H44, 2018]. This was due to high-density lipoprotein-induced activation of Akt signaling in cardiomyocytes. We now demonstrate that mice lacking the scavenger receptor class B, type I exhibit increased sensitivity to doxorubicin-induced cardiomyocyte apoptosis in vivo. Cardiomyocytes expressing scavenger receptor class B, type I are protected from doxorubicin-induced apoptosis by preincubation with high-density lipoprotein isolated from wild-type mice, whereas high-density lipoprotein from scavenger receptor class B, type 1 knockout mice is less effective. Cardiomyocytes from scavenger receptor class B, type I knockout mice, however, are not protected by high-density lipoprotein in vitro, and hearts from knockout mice are more sensitive to doxorubicin in vivo. Pharmacological administration of purified apolipoprotein A1 dramatically protected wild-type mice from doxorubicin-induced cardiotoxicity and left ventricular dysfunction, whereas this protection was lost in scavenger receptor class B, type I-deficient mice. This demonstrates, at least in mice, that high-density lipoprotein therapy can confer protection against doxorubicin-induced cardiomyocyte apoptosis in a manner mediated by the scavenger receptor class B, type I. NEW & NOTEWORTHY We show that scavenger receptor class B, type I (SR-B1) mediates HDL-dependent protection against doxorubicin-induced cardiomyocyte apoptosis and that this is a property of SR-B1 in cardiomyocytes in vitro and in hearts in vivo. We also demonstrate that pharmacological treatment with apolipoprotein A1, the major HDL structural protein, protects mice against doxorubicin-induced cardiomyocyte apoptosis and left ventricular dysfunction in an SR-B1-dependent manner. This suggests that HDL-targeted pharmacological therapy may hold promise for protecting against the deleterious, cardiotoxic side effects of this commonly used chemotherapeutic drug.
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Affiliation(s)
- Kristina K. Durham
- Medical Sciences Graduate Program, McMaster University, Hamilton, Ontario, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada
| | - George Kluck
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada
| | - Kei Cheng Mak
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada
| | - Yak D. Deng
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada
| | - Bernardo L. Trigatti
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
- Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada
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44
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Tsujita M, Akita N, Yokota T, Kobayashi F, Yokoyama S. Selective Correction of Genotype Yield by Probucol in HDL-Deficient Mice Propagation. J Atheroscler Thromb 2019; 27:25-37. [PMID: 31092744 PMCID: PMC6976725 DOI: 10.5551/jat.48967] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Aim: Probucol is a controversial drug to inhibit ATP-binding cassette transporter A1 (ABCA1) and to exhibit some positive clinical effects such as regression of xanthomas. It reportedly rescues female infertility in scavenger receptor BI-deficient mice. Here, we investigated the effect of probucol on propagation in HDL-deficient mice as alternative models for impaired HDL-mediated cholesterol delivery. Methods: Propagation of ABCA1-deficient (Abca1−/−) mice and lecithin: cholesterol acyltransferase (LCAT)-deficient (Lcat−/−) mice were quantitatively observed under the probucol treatment. Results:Abca1−/− and Lcat−/− mice appear with negligible plasma HDL concentration. Upon backcrossing Abc1+/− with the Abc1−/− mice and cross-breeding between Abc1+/− mice, the numbers of Abc1−/− weaned pups were reduced to 54.7% and to 57.1% from those expected by Mendelian genetics, respectively. Similarly, Lcat-/-weaned pups decreased to 67.7% and to 35.9% but only in the male. Probucol severely reduced plasma HDL-cholesterol to 5% in the wild-type mice, but showed no effects on their propagation. Probucol corrected the deflections of the genotype distribution in the weaned pups recovery in the LCAT-deficient mice propagation but not in the ABCA1-deficient mice while plasma HDL was kept negligible. Probucol had no effect on cholesterol content in the steroidogenic organs of the HDL-deficient mice, while it somewhat increased plasma corticosterone and expression of adrenal cortex HMG-CoA reductase, StAR, cytochrome P450scc, and VKORC1 indicating increase in the synthesis of cholesterol and steroid hormones and in vitamin K turn-over. However, no evident mechanistic background was indicated. Conclusions: Probucol corrected deflection of genotype distribution in propagation of the LCAT-deficient mice but not the ABCA1-deficient mice at the weaning stage, apparently not through normalization of hypoalphalipo-proteinemia.
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Affiliation(s)
- Maki Tsujita
- Biochemistry, Nagoya City University Graduate School of Medical Sciences
| | - Nobukatsu Akita
- Biochemistry, Nagoya City University Graduate School of Medical Sciences.,Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences
| | - Tomo Yokota
- Biochemistry, Nagoya City University Graduate School of Medical Sciences
| | - Fumihiko Kobayashi
- Biochemistry, Nagoya City University Graduate School of Medical Sciences
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Wang M, Zhao D, Xu L, Guo W, Nie L, Lei Y, Long Y, Liu M, Wang Y, Zhang X, Zhang L, Li H, Zhang J, Yuan D, Yue L. Role of PCSK9 in lipid metabolic disorders and ovarian dysfunction in polycystic ovary syndrome. Metabolism 2019; 94:47-58. [PMID: 30768966 DOI: 10.1016/j.metabol.2019.02.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 02/03/2019] [Accepted: 02/09/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND Proprotein convertase subtilisin/kexin type 9 (PCSK9) plays a critical role in the cholesterol metabolism by negatively regulating the low-density lipoprotein receptor (LDLR). Lipid metabolic and ovarian disorders are the common clinical manifestation of polycystic ovary syndrome (PCOS). Here, we intended to elucidate the role of PCSK9 in the pathogenesis of PCOS conducted on a human population in case-control design and animal part in an interventional study. METHODS We firstly investigated the serum levels of PCSK9 in 46 PCOS patients compared with 49 healthy women as controls, and then developed a PCOS mouse model induced by dehydroepiandrosterone (DHEA) and a high-fat diet (HFD) to determine the role of PCSK9 in abnormal lipid metabolism and ovarian dysfunction of PCOS in four groups (n = 40 per group): control, PCOS mice, PCOS plus alirocumab group, and PCOS plus vehicle group. The expression of PCSK9 in their serum, hepatic and ovarian tissues, serum lipid profiles and hormones were measured. Additionally, mRNA and protein expression levels of LDLR in hepatic and ovarian tissues, ovarian morphology and function were determined. Finally, we used freshly isolated theca-interstitial cells (TICs) and granulosa cells (GCs) from prepubertal normal mice to explore the effect of PCSK9 on LDL uptake of the cells. RESULTS Serum PCSK9 concentrations were higher in PCOS patients than normal controls (P < 0.05). The PCOS model mice exhibited significantly increased serum levels of total cholesterol (TC), LDL-C and high-density lipoprotein-cholesterol (HDL-C; P < 0.001, P < 0.001, P = 0.0004, respectively). Moreover, the serum PCSK9 protein level was significantly increased in PCOS mice (P = 0.0002), which positively correlated with serum LDL-C (r = 0.5279, P = 0.0004) and TC (r = 0.4151, P = 0.035). In both liver and ovary of PCOS mice, PCSK9 mRNA and protein levels were significantly increased (P < 0.05), but LDLR levels were significantly decreased (P < 0.05). Furthermore, alirocumab inhibiting PCSK9 partly increased in LDLR expression in both liver and ovary in PCOS mice, also ameliorated the lipid metabolic disorders and pathological changes of ovarian morphology and function and serum reproductive hormones but not in the PCOS plus vehicle group. In vitro experiment, recombinant PCSK9 decreased LDL uptake in TICs and GCs (P < 0.001, P = 0.0011, respectively), which were partly reversed by alirocumab (P < 0.001, P = 0.012, respectively). CONCLUSION Abnormal high expression of PCSK9 in the blood, liver and ovary may be involved in the pathogenesis of PCOS by affecting lipid metabolism and ovarian function, and the inhibition of PCSK9 may partly reverse the pathological changes of PCOS. Our research suggests a possibility of PCSK9 as a new attractive target for diagnosis and treatment of PCOS.
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Affiliation(s)
- Meijiao Wang
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Dan Zhao
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Liangzhi Xu
- Reproductive Endocrinology and Regulation Joint Laboratory, West China Second University Hospital, Sichuan University, Sichuan, Chengdu, China; Department of Obstetrics & Gynecology, West China Second University Hospital, Sichuan, Chengdu, China
| | - Wenjing Guo
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Li Nie
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Yi Lei
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Yun Long
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Min Liu
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Yichen Wang
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Xueqin Zhang
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Li Zhang
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Hanna Li
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Jinhu Zhang
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China
| | - Dongzhi Yuan
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China.
| | - Limin Yue
- Department of Physiology, West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Sichuan, Chengdu, China.
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Calderón B, Huerta L, Casado ME, González-Casbas JM, Botella-Carretero JI, Martín-Hidalgo A. Morbid obesity-related changes in the expression of lipid receptors, transporters, and HSL in human sperm. J Assist Reprod Genet 2019; 36:777-786. [PMID: 30659447 PMCID: PMC6505031 DOI: 10.1007/s10815-019-01406-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/09/2019] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVE To study the location and expression of receptors (SR-BI/CLA-1, SR-BII, and LDLr) and transporter (ABCA1) involved in uptake and efflux of cholesterol in human spermatozoa and assess whether obesity alters its location/expression and whether this could be related to infertility. DESIGN Observational study. SETTING None PATIENT(S): Ten controls and 20 obese patients. INTERVENTION(S) Anthropometric parameters. Serum and semen samples were collected. MAIN OUTCOME MEASURE(S) Spermatozoon concentration, immunolocalization, and protein expression in semen. RESULTS Spermatozoon concentration and motility was decreased in morbidly obese patients. SR-BI/CLA-1, SR-BII, LDLr, and ABCA1 are located in the spermatozoon cell membrane and the localization does not change between obese patients and controls. Control spermatozoa showed high SR-BI expression, and less expression for the rest of the receptors analyzed, indicating that SR-BI/CLA-1 is relevant in human spermatozoon cholesterol uptake/efflux. On the contrary, spermatozoa of obese patients showed less SR-BI/CLA-1 expression than controls, and more intense positive staining for SR-BII, LDLr, and ABCA1. Finally, human sperm expresses the 130- and 82-kDa hormone-sensitive lipase (HSL) isoforms. The 130-kDa isoform is expressed in the control sperm, and the expression disappears in the obese patients. CONCLUSION(S) The presence of lipid receptors/transporters and HSL in human spermatozoa suggests their role in the process of maturation/capacitation. The changes in the expression of lipid receptors/transporters and the lack of the 130-kDa HSL isoform in obese patients prevent the hydrolysis of cholesterol esters internalized by these receptors, and favor their accumulation in the cytoplasm of the spermatozoa that could contribute to lipotoxicity and infertility.
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Affiliation(s)
- Berniza Calderón
- Instituto Tecnológico Santo Domingo (INTEC), Santo Domingo, República Dominicana
- Departamento de Endocrinología y Metabolismo, Madrid, Spain
| | - Lydia Huerta
- Servicio de Bioquímica-Investigación, Madrid, Spain
| | - María Emilia Casado
- Servicio de Bioquímica-Investigación, Madrid, Spain
- CIBER de la Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Madrid, Spain
| | - José Manuel González-Casbas
- Instituto Europeo de Fertilidad y Unidad de Reproducción Asistida, Instituto Ramón y Cajal de Investigación Sanitaria (IRyCIS), Hospital Universitario Ramón y Cajal, E-28034, Madrid, Spain
| | - José Ignacio Botella-Carretero
- Departamento de Endocrinología y Metabolismo, Madrid, Spain
- CIBER de la Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Madrid, Spain
| | - Antonia Martín-Hidalgo
- Servicio de Bioquímica-Investigación, Madrid, Spain.
- CIBER de la Fisiopatología de la Obesidad y Nutrición (CIBERobn), ISCIII, Madrid, Spain.
- Department of Biochemistry-Research, Hospital Universitario Ramón y Cajal, Ctra.ColmenarViejo, Km 9.100, E-28034, Madrid, Spain.
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Proline residues in scavenger receptor-BI's C-terminal region support efficient cholesterol transport. Biochem J 2019; 476:951-963. [PMID: 30837308 PMCID: PMC6430181 DOI: 10.1042/bcj20180831] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 02/22/2019] [Accepted: 03/05/2019] [Indexed: 11/17/2022]
Abstract
High-density lipoproteins (HDLs) facilitate reverse cholesterol transport, a process in which HDL removes cholesterol from circulation and carries it to the liver for biliary excretion. Reverse cholesterol transport is also facilitated by HDL's high-affinity receptor, scavenger receptor-BI (SR-BI), by mechanisms that are not fully understood. To improve our understanding of SR-BI function, we previously solved the NMR (nuclear magnetic resonance) structure of a peptide encompassing amino acids 405–475 of SR-BI. This segment of SR-BI, that includes the functionally critical C-terminal transmembrane domain and part of the extracellular domain, also contains four conserved proline (Pro) residues. We hypothesized that these proline residues support SR-BI in a conformation that allows for efficient cholesterol transport. To test this, we generated individual Pro-to-alanine mutations in full-length SR-BI and transiently expressed the mutant receptors in COS-7 cells to measure the effects on SR-BI-mediated cholesterol transport functions. Our findings reveal that HDL cell association and uptake of HDL-cholesteryl esters are impaired by mutation of Pro-412, Pro-438, or the transmembrane proline kink residue (Pro-459). In addition, SR-BI-mediated cholesterol efflux and membrane cholesterol distribution are impaired by mutation of Pro-412 or Pro-438, indicating that these residues are essential for a fully functional SR-BI receptor. Furthermore, we demonstrate that Pro-408 is necessary for proper SR-BI expression, but mutation of Pro-408 does not cause SR-BI to become misfolded or rapidly degraded by the proteasome or the lysosome. We conclude that key proline residues play an important role in SR-BI function by allowing for the efficient transport of cholesterol between cells and HDL.
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High-Density Lipoprotein Functionality as a New Pharmacological Target on Cardiovascular Disease: Unifying Mechanism That Explains High-Density Lipoprotein Protection Toward the Progression of Atherosclerosis. J Cardiovasc Pharmacol 2019. [PMID: 29528874 DOI: 10.1097/fjc.0000000000000573] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The formation of the atherosclerotic plaque that is characterized by the accumulation of abnormal amounts of cholesterol-loaded macrophages in the artery wall is mediated by both inflammatory events and alterations of lipid/lipoprotein metabolism. Reverse transport of cholesterol opposes the formation and development of atherosclerotic plaque by promoting high density lipoprotein (HDL)-mediated removal of cholesterol from peripheral macrophages and its delivery back to the liver for excretion into the bile. Although an inverse association between HDL plasma levels and the risk of cardiovascular disease (CVD) has been demonstrated over the years, several studies have recently shown that the antiatherogenic functions of HDL seem to be mediated by their functionality, not always associated with their plasma concentrations. Therefore, assessment of HDL function, evaluated as the capacity to promote cell cholesterol efflux, may offer a better prediction of CVD than HDL levels alone. In agreement with this idea, it has recently been shown that the assessment of serum cholesterol efflux capacity (CEC), as a metric of HDL functionality, may represent a predictor of atherosclerosis extent in humans. The purpose of this narrative review is to summarize the current evidence concerning the role of cholesterol efflux capacity that is important for evaluating CVD risk, focusing on pharmacological evidences and its relationship with inflammation. We conclude that HDL therapeutics are a promising area of investigation but strategies for identifying efficacy must move beyond the idea of simply raising static HDL-cholesterol levels and toward methods of measuring the dynamics of HDL particle remodeling and the generation of lipid-free apolipoprotein A-I (apoA-I). In this way, apoA-I, unlike mature HDL, can promote the greatest extent of cholesterol efflux relieving cellular cholesterol toxicity and the inflammation it causes.
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Sahebi R, Hassanian SM, Ghayour‐Mobarhan M, Farrokhi E, Rezayi M, Samadi S, Bahramian S, Ferns GA, Avan A. Scavenger receptor Class B type I as a potential risk stratification biomarker and therapeutic target in cardiovascular disease. J Cell Physiol 2019; 234:16925-16932. [DOI: 10.1002/jcp.28393] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/23/2019] [Accepted: 01/24/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Reza Sahebi
- Department of Modern Sciences and Technologies, Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran
- Department of Molecular Medicine, School of Advanced Technologies Shahrekord University of Medical Sciences Shahrekord Iran
| | - Seyed Mahdi Hassanian
- Metabolic Syndrome Research Center Mashhad University of Medical Sciences Mashhad Iran
| | - Majid Ghayour‐Mobarhan
- Department of Modern Sciences and Technologies, Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran
- Metabolic Syndrome Research Center Mashhad University of Medical Sciences Mashhad Iran
| | - Effat Farrokhi
- Department of Molecular Medicine, School of Advanced Technologies Shahrekord University of Medical Sciences Shahrekord Iran
| | - Majid Rezayi
- Metabolic Syndrome Research Center Mashhad University of Medical Sciences Mashhad Iran
| | - Sara Samadi
- Department of Modern Sciences and Technologies, Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran
| | - Shabbou Bahramian
- Stem Cell Research Center Golestan University of Medical Sciences Gorgan Iran
| | - Gordon A. Ferns
- Division of Medical Education Brighton & Sussex Medical School, Falmer Brighton Sussex
| | - Amir Avan
- Metabolic Syndrome Research Center Mashhad University of Medical Sciences Mashhad Iran
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Fuentes M, Santander N, Cortés V. Insulin increases cholesterol uptake, lipid droplet content, and apolipoprotein B secretion in CaCo-2 cells by upregulating SR-BI via a PI3K, AKT, and mTOR-dependent pathway. J Cell Biochem 2019; 120:1550-1559. [PMID: 30278109 DOI: 10.1002/jcb.27410] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 07/10/2018] [Indexed: 01/24/2023]
Abstract
The actions of insulin on intestinal cholesterol absorption and lipoprotein secretion are not well understood. Herein, we determined the effects of insulin on the levels of cholesterol transporter scavenger receptor, class B, type I (SR-BI), cellular cholesterol uptake, intracellular lipid accumulation, and lipoprotein secretion in a cellular model of human intestinal epithelium. METHODS CaCo-2 cells were cultured to postconfluency in Transwell filters and stimulated with glucose (25 mM) in the presence or absence of insulin (100 nM) at their basolateral surface. SR-BI mRNA and protein levels were quantified by quantitative reverse transcription-PCR and immunoblot, respectively. Polarized localization of SR-BI was determined by cell surface proteins biotinylation and streptavidin precipitation. Activities of PI3K, AKT, mTOR, and SR-BI were pharmacologically antagonized. Cholesterol uptake was assessed by NBD-cholesterol incorporation. Apolipoprotein (apo) B concentration was quantified by ELISA. Subcellular localization of neutral lipids (BODIPY) and SR-BI (immunofluorescence) was determined by confocal microscopy. RESULTS In polarized CaCo-2 cells, insulin increased SR-BI at the mRNA and protein levels. SR-BI was exclusively present at apical cell surface, as indicated by biotinylation and confocal microscopy analysis. Glucose did not modify SR-BI abundance or subcellular localization. Effects of insulin on SR-BI levels were abrogated by PI3K, AKT, or mTOR pharmacological antagonism. Cholesterol uptake, neutral lipid abundance, and apo B secretion were increased by insulin in CaCo-2 cells, and these effects were prevented by SR-BI pharmacological antagonism with block lipid transport-1. CONCLUSIONS insulin promotes cholesterol uptake, intracellular lipid store, and apo B-containing lipoproteins secretion by SR-BI-dependent mechanisms in a model of human intestinal epithelium.
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Affiliation(s)
- Marcela Fuentes
- Department of Nutrition, Diabetes and Metabolism, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nicolás Santander
- Department of Nutrition, Diabetes and Metabolism, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Víctor Cortés
- Department of Nutrition, Diabetes and Metabolism, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
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