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Fassi EMA, Citarella A, Albani M, Milano EG, Legnani L, Lammi C, Silvani A, Grazioso G. PCSK9 inhibitors: a patent review 2018-2023. Expert Opin Ther Pat 2024; 34:245-261. [PMID: 38588538 DOI: 10.1080/13543776.2024.2340569] [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: 11/30/2023] [Accepted: 03/28/2024] [Indexed: 04/10/2024]
Abstract
INTRODUCTION Proprotein convertase subtilisin/kexin 9 (PCSK9) plays a crucial role in breaking down the hepatic low-density lipoprotein receptor (LDLR), thereby influencing the levels of circulating low-density lipoprotein cholesterol (LDL-C). Consequently, inhibiting PCSK9 through suitable ligands has been established as a validated therapeutic strategy for combating hypercholesterolemia and cardiovascular diseases. AREA COVERED Patent literature claiming novel compounds inhibiting PCSK9 disclosed from 2018 to June 2023 available in the espacenet database, which contains more than 150 million patent documents from over 100 patent-granting authorities worldwide. EXPERT OPINION The undisputable beneficial influence of PCSK9 as a pharmacological target has prompted numerous private and public institutions to patent chemical frameworks as inhibitors of PCSK9. While several compounds have advanced to clinical trials for treating hypercholesterolemia, they have not completed these trials yet. These compounds must contend in a complex market where new, costly, and advanced drugs, such as monoclonal antibodies and siRNA, are prescribed instead of inexpensive and less potent statins.
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Affiliation(s)
| | - Andrea Citarella
- Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy
| | - Marco Albani
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Milano, Italy
| | - Erica Ginevra Milano
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Milano, Italy
| | - Laura Legnani
- Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milano, Italy
| | - Carmen Lammi
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Milano, Italy
| | - Alessandra Silvani
- Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy
| | - Giovanni Grazioso
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Milano, Italy
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Zubillaga M, Tau J, Rosa D, Bellini MJ, Arnal N. Sex-dependent effect of sublethal copper concentrations on de novo cholesterol synthesis in astrocytes and their possible links to variations in cholesterol and amyloid precursor protein levels in neuronal membranes. Biol Sex Differ 2024; 15:4. [PMID: 38191520 PMCID: PMC10775608 DOI: 10.1186/s13293-023-00578-9] [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: 05/19/2023] [Accepted: 12/21/2023] [Indexed: 01/10/2024] Open
Abstract
BACKGROUND Cholesterol (Cho) is an essential lipophilic molecule in cells; however, both its decrease and its increase may favor the development of neurological diseases such as Alzheimer's disease (AD). Although copper (Cu) is an essential trace metal for cells, the increased plasma concentration of its free form has been linked with AD development and severity. AD affects aged people, but its prevalence and severity are higher in women than in men. We have previously shown that Cu promotes Cho de novo synthesis in immature neurons as well as increased Cho in membrane rafts and Aβ levels in culture medium, but there are no results yet regarding sex differences in the effects of sublethal Cu exposure on Cho de novo synthesis. METHODS We examined the potential sex-specific impact of sublethal Cu concentrations on de novo Cho synthesis in primary cultures of male and female astrocytes. We also explored whether this had any correlation with variations in Cho and APP levels within neuronal membrane rafts. RESULTS Flow cytometry analysis demonstrated that Cu treatment leads to a greater increase in ROS levels in female astrocytes than in males. Furthermore, through RT-PCR analysis, we observed an upregulation of SREBP-2 and HMGCR. Consistently, we observed an increase in de novo Cho synthesis. Finally, western blot analysis indicated that the levels of ABCA1 increase after Cu treatment, accompanied by a higher release of radiolabeled Cho and an elevation in Cho and APP levels in neuronal membrane rafts. Importantly, all these results were significantly more pronounced in female astrocytes than in males. CONCLUSIONS Our findings confirm that Cu stimulates Cho synthesis in astrocytes, both in a ROS-dependent and -independent manner. Moreover, female astrocytes displayed elevated levels of HMGCR, and de novo Cho synthesis compared to males following TBH and Cu treatments. This corresponds with higher levels of Cho released into the culture medium and a more significant Cho and APP rise within neuronal rafts. We consider that the increased risk of AD in females partly arises from sex-specific responses to metals and/or exogenous substances, impacting key enzyme regulation in various biochemical pathways, including HMGCR.
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Affiliation(s)
- Marlene Zubillaga
- Laboratorio de Neurociencia, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina
| | - Julia Tau
- Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina
| | - Diana Rosa
- Laboratorio de Nutrición Mineral, Fac. Cs Veterinarias, UNLP (Universidad Nacional de La Plata), Calle 60, CP 1900, La Plata, Argentina
| | - M José Bellini
- Laboratorio de Neurobiología y Cognición en el Envejecimiento y Enfermedades Neurodegenerativas, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina
| | - Nathalie Arnal
- Laboratorio de Neurociencia, Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de La Plata (UNLP), Calle 60 y 120, CP 1900, La Plata, Argentina.
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Hart NR. A theoretical model of dietary lipid variance as the origin of primary ciliary dysfunction in preeclampsia. Front Mol Biosci 2023; 10:1173030. [PMID: 37251083 PMCID: PMC10210153 DOI: 10.3389/fmolb.2023.1173030] [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: 02/24/2023] [Accepted: 04/14/2023] [Indexed: 05/31/2023] Open
Abstract
Serving as the cell's key interface in communicating with the outside world, primary cilia have emerged as an area of multidisciplinary research interest over the last 2 decades. Although the term "ciliopathy" was first used to describe abnormal cilia caused by gene mutations, recent studies focus on abnormalities of cilia that are found in diseases without clear genetic antecedents, such as obesity, diabetes, cancer, and cardiovascular disease. Preeclampsia, a hypertensive disease of pregnancy, is intensely studied as a model for cardiovascular disease partially due to many shared pathophysiologic elements, but also because changes that develop over decades in cardiovascular disease arise in days with preeclampsia yet resolve rapidly after delivery, thus providing a time-lapse view of the development of cardiovascular pathology. As with genetic primary ciliopathies, preeclampsia affects multiple organ systems. While aspirin delays the onset of preeclampsia, there is no cure other than delivery. The primary etiology of preeclampsia is unknown; however, recent reviews emphasize the fundamental role of abnormal placentation. During normal embryonic development, trophoblastic cells, which arise from the outer layer of the 4-day-old blastocyst, invade the maternal endometrium and establish extensive placental vascular connections between mother and fetus. In primary cilia of trophoblasts, Hedgehog and Wnt/catenin signaling operate upstream of vascular endothelial growth factor to advance placental angiogenesis in a process that is promoted by accessible membrane cholesterol. In preeclampsia, impaired proangiogenic signaling combined with an increase in apoptotic signaling results in shallow invasion and inadequate placental function. Recent studies show primary cilia in preeclampsia to be fewer in number and shortened with functional signaling abnormalities. Presented here is a model that integrates preeclampsia lipidomics and physiology with the molecular mechanisms of liquid-liquid phase separation in model membrane studies and the known changes in human dietary lipids over the last century to explain how changes in dietary lipids might reduce accessible membrane cholesterol and give rise to shortened cilia and defects in angiogenic signaling, which underlie placental dysfunction of preeclampsia. This model offers a possible mechanism for non-genetic dysfunction in cilia and proposes a proof-of-concept study to treat preeclampsia with dietary lipids.
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Kim H, Park C, Kim TH. Targeting Liver X Receptors for the Treatment of Non-Alcoholic Fatty Liver Disease. Cells 2023; 12:cells12091292. [PMID: 37174692 PMCID: PMC10177243 DOI: 10.3390/cells12091292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 04/29/2023] [Accepted: 04/29/2023] [Indexed: 05/15/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) refers to a range of conditions in which excess lipids accumulate in the liver, possibly leading to serious hepatic manifestations such as steatohepatitis, fibrosis/cirrhosis and cancer. Despite its increasing prevalence and significant impact on liver disease-associated mortality worldwide, no medication has been approved for the treatment of NAFLD yet. Liver X receptors α/β (LXRα and LXRβ) are lipid-activated nuclear receptors that serve as master regulators of lipid homeostasis and play pivotal roles in controlling various metabolic processes, including lipid metabolism, inflammation and immune response. Of note, NAFLD progression is characterized by increased accumulation of triglycerides and cholesterol, hepatic de novo lipogenesis, mitochondrial dysfunction and augmented inflammation, all of which are highly attributed to dysregulated LXR signaling. Thus, targeting LXRs may provide promising strategies for the treatment of NAFLD. However, emerging evidence has revealed that modulating the activity of LXRs has various metabolic consequences, as the main functions of LXRs can distinctively vary in a cell type-dependent manner. Therefore, understanding how LXRs in the liver integrate various signaling pathways and regulate metabolic homeostasis from a cellular perspective using recent advances in research may provide new insights into therapeutic strategies for NAFLD and associated metabolic diseases.
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Affiliation(s)
- Hyejin Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Chaewon Park
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Tae Hyun Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Republic of Korea
- Drug Information Research Institute, Sookmyung Women's University, Seoul 04310, Republic of Korea
- Muscle Physiome Research Center, Sookmyung Women's University, Seoul 04310, Republic of Korea
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Gumus R, Capik O, Gundogdu B, Tatar A, Altinkaynak K, Ozdemir Tozlu O, Karatas OF. Low vitamin D and high cholesterol facilitate oral carcinogenesis in 4NQO-induced rat models via regulating glycolysis. Oral Dis 2023; 29:978-989. [PMID: 34954855 DOI: 10.1111/odi.14117] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 12/06/2021] [Accepted: 12/08/2021] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Diets and nutritional habits are critical during carcinogenic processes, where a diet poor in fruits and vegetables and rich in meat and other foods of animal origin facilitates carcinogenesis. In this study, we aimed at investigating the possible involvement of vitamin D deficiency (VDD) and high cholesterol (HC) together in oral squamous cell carcinoma (OSCC) through modulating glycolysis. SUBJECTS AND METHODS We compared total cholesterol, LDL, HDL, triglycerides, LDH, and vitamin D levels of OSCC patients and control individuals. We used GEO datasets for gene set enrichment and 4-nitroquinoline-1-oxide induced in vivo oral carcinogenesis models to investigate contribution of VDD and HC during carcinogenesis via possible modulation of glycolysis. RESULTS We found that VDD and HC co-exist in OSCC patients, and deregulation of cholesterol and vitamin D levels results in enrichment of genes related to glycolysis. We, then, demonstrated that VDD and HC on their own and together facilitated the formation of larger tumors in 4NQO-induced in vivo cancer models, which are suppressed by glycolysis inhibition. CONCLUSION We reported collaborative contribution of HC and VDD during oral carcinogenesis, which is mainly carried out via altering energy metabolism in tumor cells.
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Affiliation(s)
- Rasim Gumus
- Molecular Biology and Genetics Department, Erzurum Technical University, Erzurum, Turkey
- Cancer Therapeutics Laboratory, High Technology Application and Research Center, Erzurum Technical University, Erzurum, Turkey
| | - Ozel Capik
- Molecular Biology and Genetics Department, Erzurum Technical University, Erzurum, Turkey
- Cancer Therapeutics Laboratory, High Technology Application and Research Center, Erzurum Technical University, Erzurum, Turkey
| | - Betul Gundogdu
- Department of Medical Pathology, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Arzu Tatar
- Department of Otorhinolaryngology Diseases, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Konca Altinkaynak
- Department of Medical Biochemistry, School of Medicine, University of Health Sciences, Istanbul, Turkey
| | - Ozlem Ozdemir Tozlu
- Molecular Biology and Genetics Department, Erzurum Technical University, Erzurum, Turkey
| | - Omer Faruk Karatas
- Molecular Biology and Genetics Department, Erzurum Technical University, Erzurum, Turkey
- Cancer Therapeutics Laboratory, High Technology Application and Research Center, Erzurum Technical University, Erzurum, Turkey
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Zhan N, Wang B, Martens N, Liu Y, Zhao S, Voortman G, van Rooij J, Leijten F, Vanmierlo T, Kuipers F, Jonker JW, Bloks VW, Lütjohann D, Palumbo M, Zimetti F, Adorni MP, Liu H, Mulder MT. Identification of Side Chain Oxidized Sterols as Novel Liver X Receptor Agonists with Therapeutic Potential in the Treatment of Cardiovascular and Neurodegenerative Diseases. Int J Mol Sci 2023; 24:ijms24021290. [PMID: 36674804 PMCID: PMC9863018 DOI: 10.3390/ijms24021290] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 12/27/2022] [Accepted: 12/30/2022] [Indexed: 01/11/2023] Open
Abstract
The nuclear receptors-liver X receptors (LXR α and β) are potential therapeutic targets in cardiovascular and neurodegenerative diseases because of their key role in the regulation of lipid homeostasis and inflammatory processes. Specific oxy(phyto)sterols differentially modulate the transcriptional activity of LXRs providing opportunities to develop compounds with improved therapeutic characteristics. We isolated oxyphytosterols from Sargassum fusiforme and synthesized sidechain oxidized sterol derivatives. Five 24-oxidized sterols demonstrated a high potency for LXRα/β activation in luciferase reporter assays and induction of LXR-target genes APOE, ABCA1 and ABCG1 involved in cellular cholesterol turnover in cultured cells: methyl 3β-hydroxychol-5-en-24-oate (S1), methyl (3β)-3-aldehydeoxychol-5-en-24-oate (S2), 24-ketocholesterol (S6), (3β,22E)-3-hydroxycholesta-5,22-dien-24-one (N10) and fucosterol-24,28 epoxide (N12). These compounds induced SREBF1 but not SREBP1c-mediated lipogenic genes such as SCD1, ACACA and FASN in HepG2 cells or astrocytoma cells. Moreover, S2 and S6 enhanced cholesterol efflux from HepG2 cells. All five oxysterols induced production of the endogenous LXR agonists 24(S)-hydroxycholesterol by upregulating the CYP46A1, encoding the enzyme converting cholesterol into 24(S)-hydroxycholesterol; S1 and S6 may also act via the upregulation of desmosterol production. Thus, we identified five novel LXR-activating 24-oxidized sterols with a potential for therapeutic applications in neurodegenerative and cardiovascular diseases.
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Affiliation(s)
- Na Zhan
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Department of Internal Medicine, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Boyang Wang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Nikita Martens
- Department of Internal Medicine, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
- Department of Neuroscience, Biomedical Research Institute, Hasselt University, 3500 Hasselt, Belgium
| | - Yankai Liu
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Shangge Zhao
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Gardi Voortman
- Department of Internal Medicine, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Jeroen van Rooij
- Department of Internal Medicine, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Frank Leijten
- Department of Internal Medicine, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
| | - Tim Vanmierlo
- Department of Neuroscience, Biomedical Research Institute, Hasselt University, 3500 Hasselt, Belgium
- School for Mental Health and Neuroscience, Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Folkert Kuipers
- Department of Pediatrics, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
- European Research Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
| | - Johan W. Jonker
- Department of Pediatrics, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
| | - Vincent W. Bloks
- Department of Pediatrics, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
| | - Dieter Lütjohann
- Institute of Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, 53105 Bonn, Germany
| | - Marcella Palumbo
- Department of Food and Drug, University of Parma, 43124 Parma, Italy
| | - Francesca Zimetti
- Department of Food and Drug, University of Parma, 43124 Parma, Italy
| | - Maria Pia Adorni
- Unit of Neurosciences, Department of Medicine and Surgery, University of Parma, 43125 Parma, Italy
| | - Hongbing Liu
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
- Correspondence: (H.L.); (M.T.M.)
| | - Monique T. Mulder
- Department of Internal Medicine, Erasmus Medical Center, 3015 CN Rotterdam, The Netherlands
- Correspondence: (H.L.); (M.T.M.)
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Martella N, Colardo M, Sergio W, Petraroia M, Varone M, Pensabene D, Russo M, Di Bartolomeo S, Ranalli G, Saviano G, Segatto M. Lavender Essential Oil Modulates Hepatic Cholesterol Metabolism in HepG2 Cells. Curr Issues Mol Biol 2023; 45:364-378. [PMID: 36661512 PMCID: PMC9857966 DOI: 10.3390/cimb45010026] [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: 12/13/2022] [Revised: 12/23/2022] [Accepted: 12/28/2022] [Indexed: 01/06/2023] Open
Abstract
Cholesterol is an essential lipid that guarantees several biological processes in eukaryotic cells. Its metabolism is regulated by a complex protein network that could be significantly influenced by numerous exogenous sources, such as essential oils (EOs). For instance, it has been speculated that monoterpenoid and sesquiterpenoid compounds contained in lavender essential oil (LEO) may exert important hypocholesterolemic activities. However, the molecular mechanisms by which LEO influences cholesterol homeostasis are not characterized. In this work, we evaluated the ability of LEO to regulate the protein network that controls cholesterol metabolism in the HepG2 cell line. The main findings indicate that LEO administration increases intracellular cholesterol content. Concurrently, LEO affects the expression of proteins involved in cholesterol uptake, biosynthesis, and trafficking. These effects are partially mediated by terpinene-4-ol, one of the most abundant compounds in LEO. These results demonstrate that LEO modulates cholesterol metabolism in hepatic cells.
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Affiliation(s)
- Noemi Martella
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Mayra Colardo
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - William Sergio
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Michele Petraroia
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Michela Varone
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Daniele Pensabene
- Department of Science, University Roma Tre, Viale Marconi 446, 00146 Rome, Italy
| | - Miriam Russo
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Sabrina Di Bartolomeo
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Giancarlo Ranalli
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
| | - Gabriella Saviano
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
- Correspondence: (G.S.); (M.S.)
| | - Marco Segatto
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, 86090 Pesche, Italy
- Correspondence: (G.S.); (M.S.)
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Targeting Protein Translation in Melanoma by Inhibiting EEF-2 Kinase Regulates Cholesterol Metabolism though SREBP2 to Inhibit Tumour Development. Int J Mol Sci 2022; 23:ijms23073481. [PMID: 35408842 PMCID: PMC8998919 DOI: 10.3390/ijms23073481] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 03/04/2022] [Accepted: 03/15/2022] [Indexed: 01/13/2023] Open
Abstract
Decreasing the levels of certain proteins has been shown to be important for controlling cancer but it is currently unknown whether proteins could potentially be targeted by the inhibiting of protein synthesis. Under this circumstance, targeting protein translation could preferentially affect certain pathways, which could then be of therapeutic advantage when treating cancer. In this report, eukaryotic elongation factor-2 kinase (EEF2K), which is involved in protein translation, was shown to regulate cholesterol metabolism. Targeting EEF2K inhibited key parts of the cholesterol pathway in cancer cells, which could be rescued by the addition of exogenous cholesterol, suggesting that it is a potentially important pathway modulated by targeting this process. Specifically, targeting EEF2K significantly suppressed tumour cell growth by blocking mRNA translation of the cholesterol biosynthesis transcription factor, sterol regulatory element-binding protein (SREBP) 2, and the proteins it regulates. The process could be rescued by the addition of LDL cholesterol taken into the cells via non-receptor-mediated-uptake, which negated the need for SREBP2 protein. Thus, the levels of SREBP2 needed for cholesterol metabolism in cancer cells are therapeutically vulnerable by targeting protein translation. This is the first report to suggest that targeting EEF2K can be used to modulate cholesterol metabolism to treat cancer.
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Coleman PS, Parlo RA. Cancer’s Camouflage — Microvesicle Shedding from Cholesterol-Rich Tumor Plasma Membranes Might Blindfold First-Responder Immunosurveillance Strategies. Eur J Cell Biol 2022; 101:151219. [DOI: 10.1016/j.ejcb.2022.151219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 03/14/2022] [Accepted: 03/20/2022] [Indexed: 11/03/2022] Open
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Wang Y, Yang H, Su X, Cao A, Chen F, Chen P, Yan F, Hu H. SREBP2 promotes the viability, proliferation, and migration and inhibits apoptosis in TGF-β1-induced airway smooth muscle cells by regulating TLR2/NF-κB/NFATc1/ABCA1 regulatory network. Bioengineered 2022; 13:3137-3147. [PMID: 35037821 PMCID: PMC8973716 DOI: 10.1080/21655979.2022.2026550] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Asthma is a respiratory disease with complex pathogenesis. Sterol-responsive element-binding proteins 2 (SREBP2) was found to bind to promoter sequences of ABCA1 to suppress ABCA1 promoter activity. This study aimed to explore the expression level of SREBP2 and ATP-binding cassette transporter A1 (ABCA1), and their effects on the development of airway smooth muscle cells (ASMCs) in asthma. ASMCs were treated with different concentrations of TGF-β1 (0, 0.5, 1, 5 and 10 ng/mL). Short hairpin SREBP2 (shSREBP2), SREBP2, shABCA1 or ABCA1 were transfected into ASMCs. Cell viability, proliferation, apoptosis, migration, and the expression of SREBP2, ABCA1 and related pathway proteins were detected by MTT assay, Brdu staining, flow cytometer, Transwell assay, qRT-PCR, and Western blotting, respectively. The results showed that TGF-β1 increased the viability, proliferation, migration and inhibited apoptosis in ASMCs. Moreover, TGF-β1 also decreased the expression of ABCA1, cleaved caspase-3, cleaved PARP, E-cadherin, and increased the expression of vimentin, TLR2, p-p65 and NFATc1. SREBP2 knockdown alleviated these TGF-β1-induced changes. SREBP2 overexpression inhibited ABCA1 expression and apoptosis, and promoted cell migration and the expression of TLR2, p-p65, NFATc1 in ASMCs. ABCA1 overexpression alleviated these SREBP2-induced promoting and inhibition effects. In conclusion, SREBP2 activates TLR2/NF-κB/NFATc1 regulatory network and promotes TGF-β1-induced cell movement through inhibiting ABCA1 expression.
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Affiliation(s)
- Yuebin Wang
- Department of Respiratory and Critical Care Medicine, Chengdu Third People's Hospital, Chengdu, China
| | - Huike Yang
- Department of Anatomy, Harbin Medical University, Harbin, China
| | - Xian Su
- Department of Respiratory and Critical Care Medicine, Chengdu Third People's Hospital, Chengdu, China
| | - Anqiang Cao
- Department of Cardiothoracic Surgery, Meishan People's Hospital, Meishan, China
| | - Feng Chen
- Department of Cardiothoracic Surgery, Chengdu Third People's Hospital, Chengdu, China
| | - Peng Chen
- Department of Cardiothoracic Surgery, Chengdu Third People's Hospital, Chengdu, China
| | - Fangtao Yan
- Department of Cardiothoracic Surgery, Chengdu Third People's Hospital, Chengdu, China
| | - Huirong Hu
- Department of Cardiothoracic Surgery, Chengdu Third People's Hospital, Chengdu, China
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Loughran R, Emerling BM. Mechanistic roles of mutant p53 governing lipid metabolism. Adv Biol Regul 2022; 83:100839. [PMID: 34840111 PMCID: PMC8858851 DOI: 10.1016/j.jbior.2021.100839] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Accepted: 11/16/2021] [Indexed: 01/03/2023]
Abstract
Metabolic reprogramming of cancer cells by various acquired mutations provides support for rapid proliferation and growth in the tumor microenvironment. Mutations in the TP53 gene are the most common mutation found across all human cancers. Commonly referred to as "the guardian of the genome", p53 has a well-established role as a tumor suppressor by mediating checkpoint integrity and protecting cells from DNA damage. To date, the many functional roles of p53 extending beyond its classical function and exerting control over metabolic processes continues to confound the field. Recently, emerging roles for p53 in mediating lipid metabolism have come to light with intriguing metabolic roles in regulating cholesterol homeostasis and lipid droplet formation. Herein, we will seek to unify the mechanisms by which absence of functional p53, as well as stable mutant forms of p53, exert control over these lipid metabolism programs. Of equal importance, synthetic lethal phenotypes in the context of mutant p53 and aberrant lipid homeostasis offer new possible targets in the therapeutic landscape. This review aims to characterize the mechanisms by which p53 exerts control over these pathways and examine how precision medicine may benefit from tumor subtyping of p53 mutations.
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Affiliation(s)
- Ryan Loughran
- Cell and Molecular Biology of Cancer Program, Sanford Burnham Prebys, La Jolla, CA 92037, USA
| | - Brooke M. Emerling
- Cell and Molecular Biology of Cancer Program, Sanford Burnham Prebys, La Jolla, CA 92037, USA,Correspondence:
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12
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Liu Y, Xiao Y, Xie J, Peng Y, Li F, Chen C, Li Y, Zhang X, He J, Xiao D, Yin Y. Dietary Supplementation With Flavonoids From Mulberry Leaves Improves Growth Performance and Meat Quality, and Alters Lipid Metabolism of Skeletal Muscle in a Chinese Hybrid Pig. Anim Feed Sci Technol 2022. [DOI: 10.1016/j.anifeedsci.2022.115211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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13
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Mc Auley MT. Modeling cholesterol metabolism and atherosclerosis. WIREs Mech Dis 2021; 14:e1546. [PMID: 34931487 DOI: 10.1002/wsbm.1546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 10/11/2021] [Accepted: 10/14/2021] [Indexed: 12/19/2022]
Abstract
Atherosclerotic cardiovascular disease (ASCVD) is the leading cause of morbidity and mortality among Western populations. Many risk factors have been identified for ASCVD; however, elevated low-density lipoprotein cholesterol (LDL-C) remains the gold standard. Cholesterol metabolism at the cellular and whole-body level is maintained by an array of interacting components. These regulatory mechanisms have complex behavior. Likewise, the mechanisms which underpin atherogenesis are nontrivial and multifaceted. To help overcome the challenge of investigating these processes mathematical modeling, which is a core constituent of the systems biology paradigm has played a pivotal role in deciphering their dynamics. In so doing models have revealed new insights about the key drivers of ASCVD. The aim of this review is fourfold; to provide an overview of cholesterol metabolism and atherosclerosis, to briefly introduce mathematical approaches used in this field, to critically discuss models of cholesterol metabolism and atherosclerosis, and to highlight areas where mathematical modeling could help to investigate in the future. This article is categorized under: Cardiovascular Diseases > Computational Models.
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14
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Martin M, Zhang J, Miao Y, He M, Kang J, Huang HY, Chou CH, Huang TS, Hong HC, Su SH, Wong SS, Harper RL, Wang L, Bhattacharjee R, Huang HD, Chen ZB, Malhotra A, Rabinovitch M, Hagood JS, Shyy JYJ. Role of endothelial cells in pulmonary fibrosis via SREBP2 activation. JCI Insight 2021; 6:125635. [PMID: 34806652 PMCID: PMC8663776 DOI: 10.1172/jci.insight.125635] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 10/06/2021] [Indexed: 01/22/2023] Open
Abstract
Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease with limited treatment options. Despite endothelial cells (ECs) comprising 30% of the lung cellular composition, the role of EC dysfunction in pulmonary fibrosis (PF) remains unclear. We hypothesize that sterol regulatory element-binding protein 2 (SREBP2) plays a critical role in the pathogenesis of PF via EC phenotypic modifications. Transcriptome data demonstrate that SREBP2 overexpression in ECs led to the induction of the TGF, Wnt, and cytoskeleton remodeling gene ontology pathways and the increased expression of mesenchymal genes, such as snail family transcriptional repressor 1 (snai1), α-smooth muscle actin, vimentin, and neural cadherin. Furthermore, SREBP2 directly bound to the promoter regions and transactivated these mesenchymal genes. This transcriptomic change was associated with an epigenetic and phenotypic switch in ECs, leading to increased proliferation, stress fiber formation, and ECM deposition. Mice with endothelial-specific transgenic overexpression of SREBP2 (EC-SREBP2[N]-Tg mice) that were administered bleomycin to induce PF demonstrated exacerbated vascular remodeling and increased mesenchymal transition in the lung. SREBP2 was also found to be markedly increased in lung specimens from patients with IPF. These results suggest that SREBP2, induced by lung injury, can exacerbate PF in rodent models and in human patients with IPF.
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Affiliation(s)
- Marcy Martin
- Division of Cardiology, Department of Medicine, UCSD, La Jolla, California, USA.,Vera Moulton Wall Center for Pulmonary Vascular Diseases.,Stanford Cardiovascular Institute, and.,Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
| | - Jiao Zhang
- Division of Cardiology, Department of Medicine, UCSD, La Jolla, California, USA
| | - Yifei Miao
- Division of Cardiology, Department of Medicine, UCSD, La Jolla, California, USA
| | - Ming He
- Division of Cardiology, Department of Medicine, UCSD, La Jolla, California, USA
| | - Jian Kang
- Division of Cardiology, Department of Medicine, UCSD, La Jolla, California, USA
| | - Hsi-Yuan Huang
- School of Life and Health Sciences, The Chinese University of Hong Kong, Shenzhen, Longgang District, Shenzhen, Guangdong Province, China.,Warshel Institute for Computational Biology, and School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong Province, China
| | - Chih-Hung Chou
- Institute of Bioinformatics and Systems Biology, Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Tse-Shun Huang
- Department of Bioengineering and Institute of Engineering in Medicine and
| | - Hsiao-Chin Hong
- Institute of Bioinformatics and Systems Biology, Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Shu-Han Su
- Institute of Bioinformatics and Systems Biology, Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Simon S Wong
- Division of Respiratory Medicine, Department of Pediatrics, UCSD, La Jolla, California, USA
| | - Rebecca L Harper
- Vera Moulton Wall Center for Pulmonary Vascular Diseases.,Stanford Cardiovascular Institute, and.,Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
| | - Lingli Wang
- Vera Moulton Wall Center for Pulmonary Vascular Diseases.,Stanford Cardiovascular Institute, and.,Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
| | - Rakesh Bhattacharjee
- Division of Respiratory Medicine, Department of Pediatrics, UCSD, La Jolla, California, USA
| | - Hsien-Da Huang
- School of Life and Health Sciences, The Chinese University of Hong Kong, Shenzhen, Longgang District, Shenzhen, Guangdong Province, China.,Warshel Institute for Computational Biology, and School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong Province, China
| | - Zhen Bouman Chen
- Department of Diabetes Complications and Metabolism, Beckman Research Institute, City of Hope, Duarte, California, USA
| | - Atul Malhotra
- Division of Pulmonary and Critical Care Medicine, UCSD, La Jolla, California, USA
| | - Marlene Rabinovitch
- Vera Moulton Wall Center for Pulmonary Vascular Diseases.,Stanford Cardiovascular Institute, and.,Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
| | - James S Hagood
- Division of Respiratory Medicine, Department of Pediatrics, UCSD, La Jolla, California, USA.,Division of Pulmonology, Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - John Y-J Shyy
- Division of Cardiology, Department of Medicine, UCSD, La Jolla, California, USA
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15
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Giacomini I, Gianfanti F, Desbats MA, Orso G, Berretta M, Prayer-Galetti T, Ragazzi E, Cocetta V. Cholesterol Metabolic Reprogramming in Cancer and Its Pharmacological Modulation as Therapeutic Strategy. Front Oncol 2021; 11:682911. [PMID: 34109128 PMCID: PMC8181394 DOI: 10.3389/fonc.2021.682911] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 05/06/2021] [Indexed: 12/14/2022] Open
Abstract
Cholesterol is a ubiquitous sterol with many biological functions, which are crucial for proper cellular signaling and physiology. Indeed, cholesterol is essential in maintaining membrane physical properties, while its metabolism is involved in bile acid production and steroid hormone biosynthesis. Additionally, isoprenoids metabolites of the mevalonate pathway support protein-prenylation and dolichol, ubiquinone and the heme a biosynthesis. Cancer cells rely on cholesterol to satisfy their increased nutrient demands and to support their uncontrolled growth, thus promoting tumor development and progression. Indeed, transformed cells reprogram cholesterol metabolism either by increasing its uptake and de novo biosynthesis, or deregulating the efflux. Alternatively, tumor can efficiently accumulate cholesterol into lipid droplets and deeply modify the activity of key cholesterol homeostasis regulators. In light of these considerations, altered pathways of cholesterol metabolism might represent intriguing pharmacological targets for the development of exploitable strategies in the context of cancer therapy. Thus, this work aims to discuss the emerging evidence of in vitro and in vivo studies, as well as clinical trials, on the role of cholesterol pathways in the treatment of cancer, starting from already available cholesterol-lowering drugs (statins or fibrates), and moving towards novel potential pharmacological inhibitors or selective target modulators.
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Affiliation(s)
- Isabella Giacomini
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | - Federico Gianfanti
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
- Veneto Institute of Molecular Medicine, VIMM, Padova, Italy
| | | | - Genny Orso
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | - Massimiliano Berretta
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Tommaso Prayer-Galetti
- Department of Surgery, Oncology and Gastroenterology - Urology, University of Padova, Padova, Italy
| | - Eugenio Ragazzi
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | - Veronica Cocetta
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
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16
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Participation of ABCA1 Transporter in Pathogenesis of Chronic Obstructive Pulmonary Disease. Int J Mol Sci 2021; 22:ijms22073334. [PMID: 33805156 PMCID: PMC8037621 DOI: 10.3390/ijms22073334] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 03/19/2021] [Accepted: 03/22/2021] [Indexed: 12/12/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is the important medical and social problem. According to modern concepts, COPD is a chronic inflammatory disease, macrophages play a key role in its pathogenesis. Macrophages are heterogeneous in their functions, which is largely determined by their immunometabolic profile, as well as the features of lipid homeostasis, in which the ATP binding cassette transporter A1 (ABCA1) plays an essential role. The objective of this work is the analysis of the ABCA1 protein participation and the function of reverse cholesterol transport in the pathogenesis of COPD. The expression of the ABCA1 gene in lung tissues takes the second place after the liver, which indicates the important role of the carrier in lung function. The participation of the transporter in the development of COPD consists in provision of lipid metabolism, regulation of inflammation, phagocytosis, and apoptosis. Violation of the processes in which ABCA1 is involved may be a part of the pathophysiological mechanisms, leading to the formation of a heterogeneous clinical course of the disease.
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17
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Li WJ, Zhao Y, Gao Y, Dong LL, Wu YF, Chen ZH, Shen HH. Lipid metabolism in asthma: Immune regulation and potential therapeutic target. Cell Immunol 2021; 364:104341. [PMID: 33798909 DOI: 10.1016/j.cellimm.2021.104341] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 03/03/2021] [Accepted: 03/05/2021] [Indexed: 12/12/2022]
Abstract
Asthma is a chronic inflammatory disease of the lungs that poses a considerable health and socioeconomic burden. Several risk factors work synergistically to affect the progression of asthma. Lipid metabolism, especially in distinct cells such as T cells, macrophages, granulocytes, and non-immune cells, plays an essential role in the pathogenesis of asthma, as lipids are potent signaling molecules that regulate a multitude of cellular response. In this review, we focused on the metabolic pathways of lipid molecules, especially fatty acids and their derivatives, and summarized their roles in various cells during the pathogenesis of asthma along with the current pharmacological agents targeting lipid metabolism.
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Affiliation(s)
- Wei-Jie Li
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yun Zhao
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yuan Gao
- Cancer Institute (Key Laboratory of Cancer Prevention and Intervention, Ministry of Education), Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China
| | - Ling-Ling Dong
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yin-Fang Wu
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Zhi-Hua Chen
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Hua-Hao Shen
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China; State Key Lab of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou, China.
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18
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Kanuri B, Fong V, Ponny SR, Weerasekera R, Pulakanti K, Patel KS, Tyshynsky R, Patel SB. Generation and validation of a conditional knockout mouse model for desmosterolosis. J Lipid Res 2021; 62:100028. [PMID: 33524375 PMCID: PMC7933790 DOI: 10.1016/j.jlr.2021.100028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 12/28/2020] [Accepted: 01/21/2021] [Indexed: 11/28/2022] Open
Abstract
The enzyme 3β-hydroxysterol-Δ24 reductase (DHCR24, EC 1.3.1.72) catalyzes the conversion of desmosterol to cholesterol and is obligatory for post-squalene cholesterol synthesis. Genetic loss of this enzyme results in desmosterolosis (MIM #602398), a rare disease that presents with multiple congenital anomalies, features of which overlap with subjects with the Smith-Lemli-Opitz syndrome (another post-squalene cholesterol disorder). Global knockout (KO) of Dhcr24 in mice recapitulates the biochemical phenotype, but pups die within 24 h from a lethal dermopathy, limiting its utility as a disease model. Here, we report a conditional KO mouse model (Dhcr24flx/flx) and validate it by generating a liver-specific KO (Dhcr24flx/flx,Alb-Cre). Dhcr24flx/flx,Alb-Cre mice showed normal growth and fertility, while accumulating significantly elevated levels of desmosterol in plasma and liver. Of interest, despite the loss of cholesterol synthesis in the liver, hepatic architecture, gene expression of sterol synthesis genes, and lipoprotein secretion appeared unchanged. The increased desmosterol content in bile and stool indicated a possible compensatory role of hepatobiliary secretion in maintaining sterol homeostasis. This mouse model should now allow for the study of the effects of postnatal loss of DHCR24, as well as role of tissue-specific loss of this enzyme during development and adulthood.
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Affiliation(s)
- Babunageswararao Kanuri
- Division of Endocrinology, Diabetes and Metabolism, University of Cincinnati, Cincinnati, OH, USA
| | - Vincent Fong
- Division of Endocrinology, Diabetes and Metabolism, University of Cincinnati, Cincinnati, OH, USA
| | - Sithara Raju Ponny
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | | | | | - Kriya S Patel
- Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, WI, USA
| | - Roman Tyshynsky
- Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, WI, USA
| | - Shailendra B Patel
- Division of Endocrinology, Diabetes and Metabolism, University of Cincinnati, Cincinnati, OH, USA; Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, WI, USA.
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19
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He P, Gelissen IC, Ammit AJ. Regulation of ATP binding cassette transporter A1 (ABCA1) expression: cholesterol-dependent and - independent signaling pathways with relevance to inflammatory lung disease. Respir Res 2020; 21:250. [PMID: 32977800 PMCID: PMC7519545 DOI: 10.1186/s12931-020-01515-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 09/21/2020] [Indexed: 12/11/2022] Open
Abstract
The role of the ATP binding cassette transporter A1 (ABCA1) in maintaining cellular lipid homeostasis in cardiovascular disease is well established. More recently, the important beneficial role played by ABCA1 in modulating pathogenic disease mechanisms, such as inflammation, in a broad range of chronic conditions has been realised. These studies position ABCA1 as a potential therapeutic target in a diverse range of diseases where inflammation is an underlying cause. Chronic respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD) are driven by inflammation, and as such, there is now a growing recognition that we need a greater understanding of the signaling pathways responsible for regulation of ABCA1 expression in this clinical context. While the signaling pathways responsible for cholesterol-mediated ABCA1 expression have been clearly delineated through decades of studies in the atherosclerosis field, and thus far appear to be translatable to the respiratory field, less is known about the cholesterol-independent signaling pathways that can modulate ABCA1 expression in inflammatory lung disease. This review will identify the various signaling pathways and ligands that are associated with the regulation of ABCA1 expression and may be exploited in future as therapeutic targets in the setting of chronic inflammatory lung diseases.
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Affiliation(s)
- Patrick He
- Woolcock Emphysema Centre, Woolcock Institute of Medical Research, University of Sydney, Sydney, NSW, Australia
- School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, Australia
| | - Ingrid C Gelissen
- Sydney Pharmacy School, Faculty of Medicine and Health, University of Sydney, Sydney, NSW, 2006, Australia
| | - Alaina J Ammit
- Woolcock Emphysema Centre, Woolcock Institute of Medical Research, University of Sydney, Sydney, NSW, Australia.
- School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, Australia.
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20
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Xue L, Qi H, Zhang H, Ding L, Huang Q, Zhao D, Wu BJ, Li X. Targeting SREBP-2-Regulated Mevalonate Metabolism for Cancer Therapy. Front Oncol 2020; 10:1510. [PMID: 32974183 PMCID: PMC7472741 DOI: 10.3389/fonc.2020.01510] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/14/2020] [Indexed: 12/14/2022] Open
Abstract
Recently, targeting metabolic reprogramming has emerged as a potential therapeutic approach for fighting cancer. Sterol regulatory element binding protein-2 (SREBP-2), a basic helix-loop-helix leucine zipper transcription factor, mainly regulates genes involved in cholesterol biosynthesis and homeostasis. SREBP-2 binds to the sterol regulatory elements (SREs) in the promoters of its target genes and activates the transcription of mevalonate pathway genes, such as HMG-CoA reductase (HMGCR), mevalonate kinase and other key enzymes. In this review, we first summarized the structure of SREBP-2 and its activation and regulation by multiple signaling pathways. We then found that SREBP-2 and its regulated enzymes, including HMGCR, FPPS, SQS, and DHCR4 from the mevalonate pathway, participate in the progression of various cancers, including prostate, breast, lung, and hepatocellular cancer, as potential targets. Importantly, preclinical and clinical research demonstrated that fatostatin, statins, and N-BPs targeting SREBP-2, HMGCR, and FPPS, respectively, alone or in combination with other drugs, have been used for the treatment of different cancers. This review summarizes new insights into the critical role of the SREBP-2-regulated mevalonate pathway for cancer and its potential for targeted cancer therapy.
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Affiliation(s)
- Linyuan Xue
- Research Center of Traditional Chinese Medicine, College of Traditional Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
| | - Hongyu Qi
- Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
| | - He Zhang
- Research Center of Traditional Chinese Medicine, College of Traditional Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
| | - Lu Ding
- College of Traditional Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
| | - Qingxia Huang
- Research Center of Traditional Chinese Medicine, College of Traditional Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China.,Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
| | - Daqing Zhao
- Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
| | - Boyang Jason Wu
- Department of Pharmaceutical Sciences, College of Pharmacy and Pharmaceutical Sciences, Washington State University, Spokane, WA, United States
| | - Xiangyan Li
- Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun, China
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21
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Wang X, Dong LY, Gai QJ, Ai WL, Wu Y, Xiao WC, Zhang J, An W. Lack of Augmenter of Liver Regeneration Disrupts Cholesterol Homeostasis of Liver in Mice by Inhibiting the AMPK Pathway. Hepatol Commun 2020; 4:1149-1167. [PMID: 32766475 PMCID: PMC7395071 DOI: 10.1002/hep4.1532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 04/21/2020] [Accepted: 04/22/2020] [Indexed: 01/18/2023] Open
Abstract
It is well known that excessive cholesterol accumulation within hepatocytes deteriorates nonalcoholic fatty liver disease (NAFLD). Augmenter of liver regeneration (ALR) has been reported to alleviate NAFLD through anti-apoptosis; however, whether ALR could protect liver from cholesterol-induced NAFLD remains unclear. Mice with heterozygous deletion of Gfer (the gene for ALR, Gfer +/-) were generated, and liver steatosis was induced by either choline-deficient ethionine-supplemented, methionine choline-deficient diet for 4 weeks, or high-fat diet for 16 weeks. The results showed that Gfer +/- mice developed a more severe fatty liver phenotype than Gfer +/+ mice. The livers of Gfer +/- mice exhibited a higher concentration of cholesterol and low-density lipoprotein compared with the normal mice. Transcriptome-based analysis predicts low-density lipoprotein receptor (LDLR) primarily involved in the metabolic pathway. The experiments further indicate that cholesterol accumulation within hepatocytes is closely associated with enhancing the expression of LDLR and activation of sterol regulatory element binding protein 2 (SREBP2). Because adenosine monophosphate-activated protein kinase (AMPK) is a critical regulator of SREBP2 activation, we measured whether the activity of AMPK was regulated by ALR. We found that knockdown of ALR expression inhibited the phosphorylation of LKB1, an upstream activator of AMPK, followed by AMPK inactivation and SREBP2 maturation/nuclear translocation, leading to extensive cholesterol accumulation. Meanwhile, cellular oxidative stress increased as a result of ALR knockdown, indicating that ALR might also have a role in suppressing reactive oxygen species production. Conclusion: Our results confirm that ALR regulates cholesterol metabolism and alleviates hepatic steatosis probably through the LKB1-AMPK-SREBP2-LDLR pathway in vivo and in vitro, providing a putative mechanism for combating fatty liver disease.
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Affiliation(s)
- Xin Wang
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Ling-Yue Dong
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Qu-Jing Gai
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Wei-Lun Ai
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Yuan Wu
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Wei-Chun Xiao
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Jing Zhang
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
| | - Wei An
- Department of Cell Biology Capital Medical University and the Municipal Key Laboratory for Liver Protection and Regulation of Regeneration Beijing China
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22
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Wu HP, Lin YS, Chang CF, Lu SY, Chao PM. Dietary Exposure to Oxidized Frying Oil from Fetus to Adulthood Suppresses Male Reproductive Development by Altering Testicular Cholesterol and Testosterone Homeostasis in Sprague Dawley Rats. J Nutr 2020; 150:1713-1721. [PMID: 32286625 DOI: 10.1093/jn/nxaa091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 03/09/2020] [Accepted: 03/16/2020] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Dietary frying oil may have endocrine-disrupting effects, as a feminization effect was observed in cohorts of C57BL/6J male mice fetuses from dams consuming oxidized frying oil (OFO) during pregnancy. OBJECTIVE The aim of present study was to test the hypothesis that OFO is an anti-androgen. METHODS In experiment 1, male progeny of Sprague Dawley female rats fed fresh oil or an OFO diet (10 g fat/100 g, from fresh or 24-h-fried soybean oil; [control diet (C) and OFO groups, respectively] from midgestation through lactation were studied. Pups were weaned at 3 wk of age and then consumed their mothers' diet until 9 wk of age. In addition, a group of dams and pups that consumed a high-fat diet (HF; 10 g fried and 20 g fresh soybean oil/100 g) was included to counteract body-weight loss associated with OFO ingestion. Indices of male reproductive development and testosterone homeostasis were measured. In experiment 2, male rats were allocated to C and OFO groups (treated as above) and indices of male fertility compared at 9-10 wk of age. RESULTS In experiment 1, final body weights of the HF group were lower (17%) than the C group but higher (14%) than the OFO group (P < 0.0001 for each). In addition to abnormalities in seminiferous tubules, HF and OFO groups did not differ from one another, but, compared with the C group, had delayed preputial separation (4.9 d) and reductions in serum testosterone concentrations (17-74%), anogenital distance (8-20%), weights of androgen-dependent tissues (8-30%), testicular testosterone and cholesterol concentrations (30-40%), and mRNA levels of genes involved in steroidogenesis and cholesterol homeostasis (30-70%). In experiment 2, OFO-exposed males had 20% lower sperm motility (P < 0.05); however, when mated to normal females, pregnancy rates and litter sizes did not differ between OFO and C groups. CONCLUSIONS The anti-androgenic effect of OFO in Sprague Dawley rats was attributed to decreased testicular concentrations of cholesterol (testosterone precursor) and not body-weight loss.
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Affiliation(s)
- Hai-Ping Wu
- Department of Nutrition, China Medical University, Taichung, Taiwan
| | - Yu-Shun Lin
- Department of Nutrition, China Medical University, Taichung, Taiwan
| | - Chi-Fen Chang
- Department of Anatomy, School of Medicine, China Medical University, Taichung, Taiwan
| | - Shui-Yuan Lu
- Department of Applied Toxicology, Taiwan Agricultural Chemicals and Toxic Substances Research Institute, Taichung, Taiwan
| | - Pei-Min Chao
- Department of Nutrition, China Medical University, Taichung, Taiwan
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23
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Scantlebery AML, Ochodnicky P, Kors L, Rampanelli E, Butter LM, El Boumashouli C, Claessen N, Teske GJ, van den Bergh Weerman MA, Leemans JC, Roelofs JJTH, Florquin S. β-Cyclodextrin counteracts obesity in Western diet-fed mice but elicits a nephrotoxic effect. Sci Rep 2019; 9:17633. [PMID: 31776357 PMCID: PMC6881402 DOI: 10.1038/s41598-019-53890-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 10/29/2019] [Indexed: 12/13/2022] Open
Abstract
Obesity has become a worldwide health crisis and is associated with a plethora of comorbidities. The multi-organ effects of obesity have been linked to ectopic lipid accumulation. Thus, there is an urgent need to tackle the obesity crisis by developing effective lipid-lowering therapies. 2-hydroxypropyl-β-Cyclodextrin (2HP-β-CD) has been previously shown to reduce lysosomal cholesterol accumulation in a murine model of Niemann Pick Type C (NPC) disease. Using a murine model of Western diet-induced obesity (DIO), we report the effects of 2HP-β-CD in counteracting weight gain, expansion of adipose tissue mass and ectopic lipid accumulation. Interestingly, DIO caused intracellular storage of neutral lipids in hepatic tissues and of phospholipids in kidneys, both of which were prevented by 2HP-β-CD. Importantly, this report brings attention to the nephrotoxic effects of 2HP-β-CD: renal tubular damage, inflammation and fibrosis. These effects may be overlooked, as they are best appreciated upon assessment of renal histology.
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Affiliation(s)
- Angelique M L Scantlebery
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands.
| | - Peter Ochodnicky
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Lotte Kors
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Elena Rampanelli
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Loes M Butter
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Chaima El Boumashouli
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Nike Claessen
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Gwen J Teske
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | | | - Jaklien C Leemans
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Joris J T H Roelofs
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
| | - Sandrine Florquin
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, North Holland, The Netherlands
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24
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Wheeler S, Sillence DJ. Niemann-Pick type C disease: cellular pathology and pharmacotherapy. J Neurochem 2019; 153:674-692. [PMID: 31608980 DOI: 10.1111/jnc.14895] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 09/10/2019] [Accepted: 09/15/2019] [Indexed: 12/22/2022]
Abstract
Niemann-Pick type C disease (NPCD) was first described in 1914 and affects approximately 1 in 150 000 live births. It is characterized clinically by diverse symptoms affecting liver, spleen, motor control, and brain; premature death invariably results. Its molecular origins were traced, as late as 1997, to a protein of late endosomes and lysosomes which was named NPC1. Mutation or absence of this protein leads to accumulation of cholesterol in these organelles. In this review, we focus on the intracellular events that drive the pathology of this disease. We first introduce endocytosis, a much-studied area of dysfunction in NPCD cells, and survey the various ways in which this process malfunctions. We briefly consider autophagy before attempting to map the more complex pathways by which lysosomal cholesterol storage leads to protein misregulation, mitochondrial dysfunction, and cell death. We then briefly introduce the metabolic pathways of sphingolipids (as these emerge as key species for treatment) and critically examine the various treatment approaches that have been attempted to date.
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Affiliation(s)
- Simon Wheeler
- School of Pharmacy, De Montfort University, The Gateway, Leicester, UK
| | - Dan J Sillence
- School of Pharmacy, De Montfort University, The Gateway, Leicester, UK
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25
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ER-Negative Breast Cancer Is Highly Responsive to Cholesterol Metabolite Signalling. Nutrients 2019; 11:nu11112618. [PMID: 31683867 PMCID: PMC6893441 DOI: 10.3390/nu11112618] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/16/2019] [Accepted: 10/25/2019] [Indexed: 12/29/2022] Open
Abstract
Interventions that alter cholesterol have differential impacts on hormone receptor positive- and negative-breast cancer risk and prognosis. This implies differential regulation or response to cholesterol within different breast cancer subtypes. We evaluated differences in side-chain hydroxycholesterol and liver X nuclear receptor signalling between Oestrogen Receptor (ER)-positive and ER-negative breast cancers and cell lines. Cell line models of ER-positive and ER-negative disease were treated with Liver X Receptor (LXR) ligands and transcriptional activity assessed using luciferase reporters, qPCR and MTT. Publicly available datasets were mined to identify differences between ER-negative and ER-positive tumours and siRNA was used to suppress candidate regulators. Compared to ER-positive breast cancer, ER-negative breast cancer cells were highly responsive to LXR agonists. In primary disease and cell lines LXRA expression was strongly correlated with its target genes in ER-negative but not ER-positive disease. Expression of LXR’s corepressors (NCOR1, NCOR2 and LCOR) was significantly higher in ER-positive disease relative to ER-negative, and their knock-down equalized sensitivity to ligand between subtypes in reporter, gene expression and viability assays. Our data support further evaluation of dietary and pharmacological targeting of cholesterol metabolism as an adjunct to existing therapies for ER-negative and ER-positive breast cancer patients.
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26
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Resveratrol Action on Lipid Metabolism in Cancer. Int J Mol Sci 2019; 20:ijms20112704. [PMID: 31159437 PMCID: PMC6601040 DOI: 10.3390/ijms20112704] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 05/27/2019] [Accepted: 05/28/2019] [Indexed: 12/12/2022] Open
Abstract
Cancer diseases have the leading position in human mortality nowadays. The age of oncologic patients is still decreasing, and the entire scientific society is eager for new ways to fight against cancer. One of the most discussed issues is prevention by means of natural substances. Resveratrol is a naturally occurring plant polyphenol with proven antioxidant, anti-inflammatory, and anticancer effects. Tumor cells display specific changes in the metabolism of various lipids. Resveratrol alters lipid metabolism in cancer, thereby affecting storage of energy, cell signaling, proliferation, progression, and invasiveness of cancer cells. At the whole organism level, it contributes to the optimal metabolism extent with respect to the demands of the organism. Thus, resveratrol could be used as a preventive and anticancer agent. In this review, we focus on some of the plethora of lipid pathways and signal molecules which are affected by resveratrol during carcinogenesis.
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27
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Corton JC. Frequent Modulation of the Sterol Regulatory Element Binding Protein (SREBP) by Chemical Exposure in the Livers of Rats. ACTA ACUST UNITED AC 2019; 10:113-129. [PMID: 30931410 DOI: 10.1016/j.comtox.2019.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Inappropriate activation of sterol regulatory element-binding proteins (SREBPs) can lead to non-alcoholic fatty liver disease (NAFLD). To link chemical exposure to SREBP activity, a previously characterized gene expression biomarker (Rooney et al., 2019) was used to identify microarray comparisons from rat liver that exhibited significant positive or negative correlation to the biomarker. The effects of 620 chemicals on SREBP activity were examined across 9305 chemical-dose-time microarray comparisons. SREBP was found to be frequently modulated by chemical exposure with 54% of the chemicals affecting SREBP activity. Activators included inhibitors of cholesterogenesis that act to inhibit HMG-CoA reductase (statins) or inhibit Cyp51 (conazoles). Most chemical effects were transient, lasting usually no more than 2-4 days. Modulation of SREBP in most cases led to coordinated increases or decreases in lipogenic and cholesterogenic genes. However, 570 chemical exposure conditions were identified in which regulation was uncoupled. Most of these conditions affected cholesterogenic genes in the absence of parallel effects on lipogenic genes. Together, these findings show that SREBP is a frequent target of chemical exposure and expression of lipogenic and cholesterogenic genes can be uncoupled.
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Affiliation(s)
- J Christopher Corton
- Integrated Systems Toxicology Division, NHEERL/ORD, US-EPA, Research Triangle Park, NC 27711
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28
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Jackson AO, Regine MA, Subrata C, Long S. Molecular mechanisms and genetic regulation in atherosclerosis. IJC HEART & VASCULATURE 2018; 21:36-44. [PMID: 30276232 PMCID: PMC6161413 DOI: 10.1016/j.ijcha.2018.09.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 08/23/2018] [Accepted: 09/17/2018] [Indexed: 02/06/2023]
Abstract
Atherosclerosis (AS) manifested by lipid accumulation, extracellular matrix protein deposition, and calcification in the intima and media of the large to medium size arteries promoting arterial stiffness and reduction of elasticity. It has been accepted that AS leads to increased morbidity and mortality worldwide. Recent studies indicated that genetic abnormalities play an important role in the development of AS. Specific genetic mutation and histone modification have been found to induce AS formation. Furthermore, specific RNAs such as microRNAs and circular RNAs have been identified to play a crucial role in the progression of AS. Nevertheless, the mechanisms by which genetic mutation, DNA and histone modification, microRNAs and circular RNA induce AS still remain elusive. This review describes specific mechanisms and pathways through which genetic mutation, DNA and histone modification, microRNAs and circular RNA instigate AS. This review further provides a therapeutic strategic direction for the treatment of AS targeting genetic mechanisms. DNA and histone modifications promote transcriptional changes in atherosclerosis. Gene mutations cause dyslipidemia and hyperglycemia to promote atherosclerosis. miRNAs and cirRNA are involved in the development of atherosclerosis. Gene mutations associated oxidative stress and altered inflammatory and nutritive factors promote atherosclerosis.
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Affiliation(s)
- Ampadu-Okyere Jackson
- Research lab of translational medicine, Medical school, University of South China, Hengyang, Hunan Province 421001, China.,International college, University of South China, Hengyang, Hunan Province 421001, China
| | - Mugwaneza Annick Regine
- Research lab of translational medicine, Medical school, University of South China, Hengyang, Hunan Province 421001, China.,International college, University of South China, Hengyang, Hunan Province 421001, China
| | - Chakrabarti Subrata
- Department of Pathology and Laboratory Medicine, Western University, London, Ontario, Canada
| | - Shiyin Long
- Department of Biochemistry and Molecular Biology, University of South China, Hengyang, Hunan Province 421001, China
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29
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Abstract
Liver X receptors α and β (LXRα and LXRβ) are nuclear receptors with pivotal roles in the transcriptional control of lipid metabolism. Transcriptional activity of LXRs is induced in response to elevated cellular levels of cholesterol. LXRs bind to and regulate the expression of genes that encode proteins involved in cholesterol absorption, transport, efflux, excretion and conversion to bile acids. The coordinated, tissue-specific actions of the LXR pathway maintain systemic cholesterol homeostasis and regulate immune and inflammatory responses. LXRs also regulate fatty acid metabolism by controlling the lipogenic transcription factor sterol regulatory element-binding protein 1c and regulate genes that encode proteins involved in fatty acid elongation and desaturation. LXRs exert important effects on the metabolism of phospholipids, which, along with cholesterol, are major constituents of cellular membranes. LXR activation preferentially drives the incorporation of polyunsaturated fatty acids into phospholipids by inducing transcription of the remodelling enzyme lysophosphatidylcholine acyltransferase 3. The ability of the LXR pathway to couple cellular sterol levels with the saturation of fatty acids in membrane phospholipids has implications for several physiological processes, including lipoprotein production, dietary lipid absorption and intestinal stem cell proliferation. Understanding how LXRs regulate membrane composition and function might provide new therapeutic insight into diseases associated with dysregulated lipid metabolism, including atherosclerosis, diabetes mellitus and cancer.
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Affiliation(s)
- Bo Wang
- Department of Pathology and Laboratory Medicine, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Peter Tontonoz
- Department of Pathology and Laboratory Medicine, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
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30
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Bradbury P, Traini D, Ammit AJ, Young PM, Ong HX. Repurposing of statins via inhalation to treat lung inflammatory conditions. Adv Drug Deliv Rev 2018; 133:93-106. [PMID: 29890243 DOI: 10.1016/j.addr.2018.06.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/14/2018] [Accepted: 06/06/2018] [Indexed: 12/22/2022]
Abstract
Despite many therapeutic advancements over the past decade, the continued rise in chronic inflammatory lung diseases incidence has driven the need to identify and develop new therapeutic strategies, with superior efficacy to treat these diseases. Statins are one class of drug that could potentially be repurposed as an alternative treatment for chronic lung diseases. They are currently used to treat hypercholesterolemia by inhibiting the 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, that catalyses the rate limiting step in the mevalonate biosynthesis pathway, a key intermediate in cholesterol metabolism. Recent research has identified statins to have other protective pleiotropic properties including anti-inflammatory, anti-oxidant, muco-inhibitory effects that may be beneficial for the treatment of chronic inflammatory lung diseases. However, clinical studies have yielded conflicting results. This review will summarise some of the current evidences for statins pleiotropic effects that could be applied for the treatment of chronic inflammatory lung diseases, their mechanisms of actions, and the potential to repurpose statins as an inhaled therapy, including a detailed discussion on their different physical-chemical properties and how these characteristics could ultimately affect treatment efficacies. The repurposing of statins from conventional anti-cholesterol oral therapy to inhaled anti-inflammatory formulation is promising, as it provides direct delivery to the airways, reduced risk of side effects, increased bioavailability and tailored physical-chemical properties for enhanced efficacy.
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31
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Islam MS, Castellucci C, Fiorini R, Greco S, Gagliardi R, Zannotti A, Giannubilo SR, Ciavattini A, Frega NG, Pacetti D, Ciarmela P. Omega-3 fatty acids modulate the lipid profile, membrane architecture, and gene expression of leiomyoma cells. J Cell Physiol 2018; 233:7143-7156. [PMID: 29574773 DOI: 10.1002/jcp.26537] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 02/12/2018] [Indexed: 12/13/2022]
Abstract
Uterine leiomyomas (fibroids or myomas) are the most common benign tumors of premenopausal women and new medical treatments are needed. This study aimed to determine the effects of omega-3 fatty acids on the lipid profile, membrane architecture and gene expression patterns of extracellular matrix components (collagen1A1, fibronectin, versican, or activin A), mechanical signaling (integrin β1, FAK, and AKAP13), sterol regulatory molecules (ABCG1, ABCA1, CAV1, and SREBF2), and mitochondrial enzyme (CYP11A1) in myometrial and leiomyoma cells. Myometrial tissues had a higher amount of arachidonic acid than leiomyoma tissues while leiomyoma tissues had a higher level of linoleic acid than myometrial tissues. Treatment of primary myometrial and leiomyoma cells with eicosapentaenoic acid (EPA) or docosahexaenoic acid (DHA) reduced the monounsaturated fatty acid (MUFA) content and increased the polyunsaturated fatty acid (PUFA) content in both cell types. Myometrial and leiomyoma cell membranes were in the liquid-crystalline phase, but EPA- and DHA-treated cells had decreased membrane fluidity. While we found no changes in the mRNA expression of ECM components, EPA and DHA treatment reduced levels of ABCG1, ABCA1, and AKAP13 in both cell types. EPA and DHA also reduced FAK and CYP11A1 expression in myometrial cells. The ability of omega-3 fatty acids to remodel membrane architecture and downregulate the expression of genes involved in mechanical signaling and lipid accumulation in leiomyoma cells offers to further investigate this compound as preventive and/or therapeutic option.
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Affiliation(s)
- Md Soriful Islam
- Department of Experimental and Clinical Medicine, Università Politecnica delle Marche, Ancona, Italy.,Biotechnology and Microbiology Laboratory, Department of Botany, University of Rajshahi, Rajshahi, Bangladesh
| | - Clara Castellucci
- Department of Clinical and Molecular Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Rosamaria Fiorini
- Department of Life and Environmental Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Stefania Greco
- Department of Experimental and Clinical Medicine, Università Politecnica delle Marche, Ancona, Italy
| | | | - Alessandro Zannotti
- Department of Experimental and Clinical Medicine, Università Politecnica delle Marche, Ancona, Italy
| | - Stefano R Giannubilo
- Department of Clinical Science, Università Politecnica delle Marche, Ancona, Italy
| | - Andrea Ciavattini
- Department of Clinical Science, Università Politecnica delle Marche, Ancona, Italy
| | - Natale G Frega
- Department of Agricultural, Food and Environmental Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Deborah Pacetti
- Department of Agricultural, Food and Environmental Sciences, Università Politecnica delle Marche, Ancona, Italy
| | - Pasquapina Ciarmela
- Department of Experimental and Clinical Medicine, Università Politecnica delle Marche, Ancona, Italy.,Department of Information Engineering, Università Politecnica delle , Marche, Ancona, Italy
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32
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Ebner L, Gläser A, Bräuer A, Witt M, Wree A, Rolfs A, Frank M, Vollmar B, Kuhla A. Evaluation of Two Liver Treatment Strategies in a Mouse Model of Niemann-Pick-Disease Type C1. Int J Mol Sci 2018; 19:ijms19040972. [PMID: 29587349 PMCID: PMC5979582 DOI: 10.3390/ijms19040972] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 03/14/2018] [Accepted: 03/20/2018] [Indexed: 11/16/2022] Open
Abstract
Niemann–Pick-disease type C1 (NPC1) is an autosomal-recessive cholesterol-storage disorder. Besides other symptoms, NPC1 patients develop liver dysfunction and hepatosplenomegaly. The mechanisms of hepatomegaly and alterations of lipid metabolism-related genes in NPC1 disease are still poorly understood. Here, we used an NPC1 mouse model to study an additive hepatoprotective effect of a combination of 2-hydroxypropyl-β-cyclodextrin (HPβCD), miglustat and allopregnanolone (combination therapy) with the previously established monotherapy using HPβCD. We examined transgene effects as well as treatment effects on liver morphology and hepatic lipid metabolism, focusing on hepatic cholesterol transporter genes. Livers of Npc1−/− mice showed hepatic cholesterol sequestration with consecutive liver injury, an increase of lipogenetic gene expression, e.g., HMG-CoA, a decrease of lipolytic gene expression, e.g., pparα and acox1, and a decrease of lipid transporter gene expression, e.g., acat1, abca1 and fatp2. Both, combination therapy and monotherapy, led to a reduction of hepatic lipids and an amelioration of NPC1 liver disease symptoms. Monotherapy effects were related to pparα- and acox1-associated lipolysis/β-oxidation and to fatp2-induced fatty acid transport, whereas the combination therapy additionally increased the cholesterol transport via abca1 and apoE. However, HPβCD monotherapy additionally increased cholesterol synthesis as indicated by a marked increase of the HMG-CoA and srebp-2 mRNA expression, probably as a result of increased hepatocellular proliferation.
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Affiliation(s)
- Lynn Ebner
- Institute for Experimental Surgery, Rostock University Medical Center, Schillingallee 69a, 18057 Rostock, Germany.
| | - Anne Gläser
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstraße 9, 18057 Rostock, Germany.
| | - Anja Bräuer
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstraße 9, 18057 Rostock, Germany.
| | - Martin Witt
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstraße 9, 18057 Rostock, Germany.
| | - Andreas Wree
- Institute of Anatomy, Rostock University Medical Center, Gertrudenstraße 9, 18057 Rostock, Germany.
| | - Arndt Rolfs
- Albrecht Kossel Institute for Neuroregeneration, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany.
| | - Marcus Frank
- Medical Biology and Electron Microscopy Center, Rostock University Medical Center, 18057 Rostock, Germany.
| | - Brigitte Vollmar
- Institute for Experimental Surgery, Rostock University Medical Center, Schillingallee 69a, 18057 Rostock, Germany.
| | - Angela Kuhla
- Institute for Experimental Surgery, Rostock University Medical Center, Schillingallee 69a, 18057 Rostock, Germany.
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33
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Lemos BS, Medina-Vera I, Blesso CN, Fernandez ML. Intake of 3 Eggs per Day When Compared to a Choline Bitartrate Supplement, Downregulates Cholesterol Synthesis without Changing the LDL/HDL Ratio. Nutrients 2018; 10:nu10020258. [PMID: 29495288 PMCID: PMC5852834 DOI: 10.3390/nu10020258] [Citation(s) in RCA: 38] [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: 01/15/2018] [Revised: 02/08/2018] [Accepted: 02/17/2018] [Indexed: 01/14/2023] Open
Abstract
Cardiovascular disease (CVD) risk is associated with high concentrations of low-density lipoprotein cholesterol (LDL-C). The impact of dietary cholesterol on plasma lipid concentrations still remains a concern. The effects of egg intake in comparison to choline bitartrate supplement was studied in a young, healthy population. Thirty participants were enrolled for a 13-week intervention. After a 2-week run-in period, subjects were randomized to consume either 3 eggs/day or a choline bitartrate supplement (~400 mg choline for both treatments) for 4-weeks each. After a 3-week washout period, they were allocated to the alternate treatment. Dietary records, plasma lipids, apolipoproteins (apo) concentrations, and peripheral blood mononuclear cell expression of regulatory genes for cholesterol homeostasis were assessed at the end of each intervention. Dietary intakes of saturated and monounsaturated fat were higher with the consumption of eggs compared to the choline period. In addition, higher plasma concentrations of total cholesterol (7.5%), high density lipoprotein cholesterol (HDL-C) (5%) and LDL-C (8.1%) were observed with egg consumption (p < 0.01), while no change was seen in LDL-C/HDL-C ratio, a key marker of heart disease risk. Compared to choline supplementation, intake of eggs resulted in higher concentrations of plasma apoA-I (8%) and apoE (17%) with no changes in apoB. Sterol regulatory element-binding protein 2 and 3-hydroxy-3-methylglutaryl-CoA reductase expression were lower with egg consumption by 18% and 31%, respectively (p < 0.05), suggesting a compensation to the increased dietary cholesterol load. Therefore, dietary cholesterol from eggs appears to regulate endogenous synthesis of cholesterol in such a way that the LDL-C/HDL-C ratio is maintained.
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Affiliation(s)
- Bruno S Lemos
- Department of Nutritional Sciences, University of Connecticut, Storrs, Mansfield, CT 06269, USA.
| | - Isabel Medina-Vera
- Departamento de Metodologia de Investigacion, Instituto Nacional de Pediatria, CD Mexico 04530, Mexico.
| | - Christopher N Blesso
- Department of Nutritional Sciences, University of Connecticut, Storrs, Mansfield, CT 06269, USA.
| | - Maria Luz Fernandez
- Department of Nutritional Sciences, University of Connecticut, Storrs, Mansfield, CT 06269, USA.
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34
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Zhang L, Rajbhandari P, Priest C, Sandhu J, Wu X, Temel R, Castrillo A, de Aguiar Vallim TQ, Sallam T, Tontonoz P. Inhibition of cholesterol biosynthesis through RNF145-dependent ubiquitination of SCAP. eLife 2017; 6:e28766. [PMID: 29068315 PMCID: PMC5656429 DOI: 10.7554/elife.28766] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 10/05/2017] [Indexed: 12/25/2022] Open
Abstract
Cholesterol homeostasis is maintained through concerted action of the SREBPs and LXRs. Here, we report that RNF145, a previously uncharacterized ER membrane ubiquitin ligase, participates in crosstalk between these critical signaling pathways. RNF145 expression is induced in response to LXR activation and high-cholesterol diet feeding. Transduction of RNF145 into mouse liver inhibits the expression of genes involved in cholesterol biosynthesis and reduces plasma cholesterol levels. Conversely, acute suppression of RNF145 via shRNA-mediated knockdown, or chronic inactivation of RNF145 by genetic deletion, potentiates the expression of cholesterol biosynthetic genes and increases cholesterol levels both in liver and plasma. Mechanistic studies show that RNF145 triggers ubiquitination of SCAP on lysine residues within a cytoplasmic loop essential for COPII binding, potentially inhibiting its transport to Golgi and subsequent processing of SREBP-2. These findings define an additional mechanism linking hepatic sterol levels to the reciprocal actions of the SREBP-2 and LXR pathways.
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Affiliation(s)
- Li Zhang
- Department of Pathology and Laboratory MedicineHoward Hughes Medical Institute, University of California, Los AngelesLos AngelesUnited States
| | - Prashant Rajbhandari
- Department of Pathology and Laboratory MedicineHoward Hughes Medical Institute, University of California, Los AngelesLos AngelesUnited States
| | - Christina Priest
- Department of Pathology and Laboratory MedicineHoward Hughes Medical Institute, University of California, Los AngelesLos AngelesUnited States
| | - Jaspreet Sandhu
- Department of Pathology and Laboratory MedicineHoward Hughes Medical Institute, University of California, Los AngelesLos AngelesUnited States
| | - Xiaohui Wu
- Department of Medicine, Division of CardiologyUniversity of California, Los AngelesLos AngelesUnited States
| | - Ryan Temel
- Saha Cardiovascular Research CenterUniversity of KentuckyLexingtonUnited States
- Department of Pharmacology and Nutritional SciencesUniversity of KentuckyLexingtonUnited States
| | - Antonio Castrillo
- Instituto de Investigaciones Biomédicas Alberto SolsCSIC-Universidad Autónoma de Madrid, Unidad de Biomedicina-Universidad de Las Palmas de Gran Canaria (Unidad asociada al CSIC)Las Palmas de Gran CanariaSpain
- Instituto Universitario de Investigaciones Biomédicas y SanitariasUniversidad de Las Palmas de Gran CanariaLas Palmas de Gran CanariaSpain
| | - Thomas Q de Aguiar Vallim
- Department of Medicine, Division of CardiologyUniversity of California, Los AngelesLos AngelesUnited States
| | - Tamer Sallam
- Department of Medicine, Division of CardiologyUniversity of California, Los AngelesLos AngelesUnited States
| | - Peter Tontonoz
- Department of Pathology and Laboratory MedicineHoward Hughes Medical Institute, University of California, Los AngelesLos AngelesUnited States
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35
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Hong SH, Kim M, Woo M, Song YO. Effects of ingredients of Korean brown rice cookies on attenuation of cholesterol level and oxidative stress in high-fat diet-fed mice. Nutr Res Pract 2017; 11:365-372. [PMID: 28989572 PMCID: PMC5621358 DOI: 10.4162/nrp.2017.11.5.365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 07/04/2017] [Accepted: 07/31/2017] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND/OBJECTIVES Owing to health concerns related to the consumption of traditional snacks high in sugars and fats, much effort has been made to develop functional snacks with low calorie content. In this study, a new recipe for Korean rice cookie, dasik, was developed and its antioxidative, lipid-lowering, and anti-inflammatory effects and related mechanisms were elucidated. The effects were compared with those of traditional rice cake dasik (RCD), the lipid-lowering effect of which is greater than that of traditional western-style cookies. MATERIALS/METHODS Ginseng-added brown rice dasik (GBRD) was prepared with brown rice flour, fructooligosaccharide, red ginseng extract, and propolis. Mice were grouped (n = 7 per group) into those fed a normal AIN-76 diet, a high-fat diet (HFD), and HFD supplemented with RCD or GBRD. Dasik in the HFD accounted for 7% of the total calories. The lipid, reactive oxygen species, and peroxynitrite levels, and degree of lipid peroxidation in the plasma or liver were determined. The expression levels of proteins involved in lipid metabolism and inflammation, and those of antioxidant enzymes were determined by western blot analysis. RESULTS The plasma and hepatic total cholesterol concentrations in the GBRD group were significantly decreased via downregulation of sterol regulatory element-binding protein-2 and 3-hydroxy-3-methylglutaryl-CoA reductase (P < 0.05). The hepatic peroxynitrite level was significantly lower, whereas glutathione was higher, in the GBRD group than in the RCD group. Among the antioxidant enzymes, catalase (CAT) and glutathione peroxidase (GPx) were significantly upregulated in the GBRD group (P < 0.05). In addition, nuclear factor-kappaB (NF-κB) expression in the GBRD group was significantly lower than that in the RCD group. CONCLUSIONS GBRD decreases the plasma and hepatic cholesterol levels by downregulating cholesterol synthesis. This new dasik recipe also improves the antioxidative and anti-inflammatory status in HFD-fed mice via CAT and GPx upregulation and NF-κB downregulation. These effects were significantly higher than those of RCD.
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Affiliation(s)
- Sun Hee Hong
- Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University, 2 Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Mijeong Kim
- Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University, 2 Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Minji Woo
- Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University, 2 Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Yeong Ok Song
- Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University, 2 Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Korea
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Panahi Y, Ahmadi Y, Teymouri M, Johnston TP, Sahebkar A. Curcumin as a potential candidate for treating hyperlipidemia: A review of cellular and metabolic mechanisms. J Cell Physiol 2017; 233:141-152. [DOI: 10.1002/jcp.25756] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 12/21/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Yunes Panahi
- Chemical Injuries Research CenterBaqiyatallah University of Medical SciencesTehranIran
| | - Yasin Ahmadi
- Tabriz University of Medical SciencesStudent Research CommitteeTabrizIran
| | - Manouchehr Teymouri
- Biotechnology Research Center, Nanotechnology Research Center, School of PharmacyMashhad University of Medical SciencesMashhadIran
| | - Thomas P. Johnston
- Division of Pharmaceutical Sciences, School of PharmacyUniversity of Missouri‐Kansas CityKansas CityMissouri
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Paththinige CS, Sirisena ND, Dissanayake V. Genetic determinants of inherited susceptibility to hypercholesterolemia - a comprehensive literature review. Lipids Health Dis 2017; 16:103. [PMID: 28577571 PMCID: PMC5457620 DOI: 10.1186/s12944-017-0488-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 05/17/2017] [Indexed: 02/08/2023] Open
Abstract
Hypercholesterolemia is a strong determinant of mortality and morbidity associated with cardiovascular diseases and a major contributor to the global disease burden. Mutations in four genes (LDLR, APOB, PCSK9 and LDLRAP1) account for the majority of cases with familial hypercholesterolemia. However, a substantial proportion of adults with hypercholesterolemia do not have a mutation in any of these four genes. This indicates the probability of having other genes with a causative or contributory role in the pathogenesis of hypercholesterolemia and suggests a polygenic inheritance of this condition. Here in, we review the recent evidence of association of the genetic variants with hypercholesterolemia and the three lipid traits; total cholesterol (TC), HDL-cholesterol (HDL-C) and LDL-cholesterol (LDL-C), their biological pathways and the associated pathogenetic mechanisms. Nearly 80 genes involved in lipid metabolism (encoding structural components of lipoproteins, lipoprotein receptors and related proteins, enzymes, lipid transporters, lipid transfer proteins, and activators or inhibitors of protein function and gene transcription) with single nucleotide variants (SNVs) that are recognized to be associated with hypercholesterolemia and serum lipid traits in genome-wide association studies and candidate gene studies were identified. In addition, genome-wide association studies in different populations have identified SNVs associated with TC, HDL-C and LDL-C in nearly 120 genes within or in the vicinity of the genes that are not known to be involved in lipid metabolism. Over 90% of the SNVs in both these groups are located outside the coding regions of the genes. These findings indicates that there might be a considerable number of unrecognized processes and mechanisms of lipid homeostasis, which when disrupted, would lead to hypercholesterolemia. Knowledge of these molecular pathways will enable the discovery of novel treatment and preventive methods as well as identify the biochemical and molecular markers for the risk prediction and early detection of this common, yet potentially debilitating condition.
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Affiliation(s)
- C S Paththinige
- Human Genetics Unit, Faculty of Medicine, University of Colombo, Kynsey Road, Colombo, 00800, Sri Lanka.
| | - N D Sirisena
- Human Genetics Unit, Faculty of Medicine, University of Colombo, Kynsey Road, Colombo, 00800, Sri Lanka
| | - Vhw Dissanayake
- Human Genetics Unit, Faculty of Medicine, University of Colombo, Kynsey Road, Colombo, 00800, Sri Lanka
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Quinn AG, Schwemberger R, Stock EO, Movsesyan I, Axtell A, Chang S, Ishida BY, Malloy MJ, Kane JP, Pullinger CR. Moderate statin treatment reduces prebeta-1 high-density lipoprotein levels in dyslipidemic patients. J Clin Lipidol 2017; 11:908-914. [PMID: 28558949 DOI: 10.1016/j.jacl.2017.04.118] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 04/21/2017] [Accepted: 04/25/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND Elevated plasma levels of prebeta-1 high-density lipoprotein (HDL), the principal acceptor of cholesterol effluxed from macrophages, are associated with increased risk of atherosclerotic coronary heart disease and myocardial infarction. OBJECTIVE The objective of the study was to assess the effects on prebeta-1 HDL levels of 6-week moderate-dose statin treatment. METHODS We studied 101 patients (mean age 52.7 years; 53.5% female; 63 with primary hypercholesterolemia; 38 with combined hyperlipidemia) before and after treatment with statins. Mean atorvastatin potency equivalence was 23.6 mg/d. Prebeta-1 HDL plasma levels were measured by immunofixation of agarose gels using anti-apolipoprotein A-1 antibody. RESULTS We observed a 42.0% reduction of low-density lipoprotein cholesterol (181 ± 56 vs 105 mg/dL, P < .001). Triglyceride (TG) levels decreased by 22.3% (157 vs 122 mg/dL, P < .001), HDL cholesterol levels remained similar (56.0 vs 57.1, P = NS). Levels of prebeta-1 HDL were significantly reduced by 17.9% after statin treatment (mean 11.4 vs 9.4 mg apoA-1/dL, P < .001). The magnitude of this decrease was similar with each of 3 statins (atorvastatin, simvastatin, and rosuvastatin). The decrease in prebeta-1 HDL was strongly associated with the decline in TG, but not with the decline in low-density lipoprotein cholesterol. CONCLUSIONS The association of high prebeta-1 HDL with coronary heart disease identifies it as an inferential measure of the rate of cholesterol efflux from the artery wall. Our observations demonstrate a reduction of prebeta-1 HDL with statin therapy, partially reflecting the reduced TGs, and probably reflecting a direct beneficial impact on cholesterol efflux.
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Affiliation(s)
- Alex G Quinn
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA
| | - Rachel Schwemberger
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA
| | - Eveline Oestreicher Stock
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA; Department of Medicine, University of California, San Francisco, San Francisco, CA, USA
| | - Irina Movsesyan
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA
| | - Andrea Axtell
- Department of Surgery, Massachusetts General Hospital, Boston MA, USA
| | - Sunny Chang
- Department of Pediatrics, Stony Brook University Hospital, Stony Brook, NY, USA
| | - Brian Y Ishida
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA
| | - Mary J Malloy
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA; Department of Medicine, University of California, San Francisco, San Francisco, CA, USA
| | - John P Kane
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA; Department of Medicine, University of California, San Francisco, San Francisco, CA, USA; Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA, USA
| | - Clive R Pullinger
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA, USA; Department of Physiological Nursing, University of California, San Francisco, San Francisco, CA, USA.
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Park SH, Kim J, Yu M, Park JH, Kim YS, Moon Y. Epithelial Cholesterol Deficiency Attenuates Human Antigen R-linked Pro-inflammatory Stimulation via an SREBP2-linked Circuit. J Biol Chem 2016; 291:24641-24656. [PMID: 27703009 DOI: 10.1074/jbc.m116.723973] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 09/16/2016] [Indexed: 01/03/2023] Open
Abstract
Patients with chronic intestinal ulcerative diseases, such as inflammatory bowel disease, tend to exhibit abnormal lipid profiles, which may affect the gut epithelial integrity. We hypothesized that epithelial cholesterol depletion may trigger inflammation-checking machinery via cholesterol sentinel signaling molecules whose disruption in patients may aggravate inflammation and disease progression. In the present study, sterol regulatory element-binding protein 2 (SREBP2) as the cholesterol sentinel was assessed for its involvement in the epithelial inflammatory responses in cholesterol-depleted enterocytes. Patients and experimental animals with intestinal ulcerative injuries showed suppression in epithelial SREBP2. Moreover, SREBP2-deficient enterocytes showed enhanced pro-inflammatory signals in response to inflammatory insults, indicating regulatory roles of SREBP2 in gut epithelial inflammation. However, epithelial cholesterol depletion transiently induced pro-inflammatory chemokine expression regardless of the well known pro-inflammatory nuclear factor-κB signals. In contrast, cholesterol depletion also exerts regulatory actions to maintain epithelial homeostasis against excessive inflammation via SREBP2-associated signals in a negative feedback loop. Mechanistically, SREBP2 and its induced target EGR-1 were positively involved in induction of peroxisome proliferator-activated receptor γ (PPARγ), a representative anti-inflammatory transcription factor. As a crucial target of the SREBP2-EGR-1-PPARγ-associated signaling pathways, the mRNA stabilizer, human antigen R (HuR) was retained in nuclei, leading to reduced stability of pro-inflammatory chemokine transcripts. This mechanistic investigation provides clinical insights into protective roles of the epithelial cholesterol deficiency against excessive inflammatory responses via the SREBP2-HuR circuit, although the deficiency triggers transient pro-inflammatory signals.
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Affiliation(s)
- Seong-Hwan Park
- From the Laboratory of Mucosal Exposome and Biomodulation, Department of Biomedical Sciences and Medical Research Institute, Pusan National University School of Medicine, Yangsan 50612
| | - Juil Kim
- From the Laboratory of Mucosal Exposome and Biomodulation, Department of Biomedical Sciences and Medical Research Institute, Pusan National University School of Medicine, Yangsan 50612
| | - Mira Yu
- From the Laboratory of Mucosal Exposome and Biomodulation, Department of Biomedical Sciences and Medical Research Institute, Pusan National University School of Medicine, Yangsan 50612
| | - Jae-Hong Park
- the Department of Pediatrics, Pusan National University, Yangsan 50612
| | - Yong Sik Kim
- the Department of Pharmacology, College of Medicine, Seoul National University, Seoul 03080, and
| | - Yuseok Moon
- From the Laboratory of Mucosal Exposome and Biomodulation, Department of Biomedical Sciences and Medical Research Institute, Pusan National University School of Medicine, Yangsan 50612,; the Immunoregulatory Therapeutics Group in Brain Busan 21 Project, Busan 46241, Korea.
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40
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Mostafa AM, Hamdy NM, Abdel-Rahman SZ, El-Mesallamy HO. Effect of vildagliptin and pravastatin combination on cholesterol efflux in adipocytes. IUBMB Life 2016; 68:535-43. [PMID: 27251372 DOI: 10.1002/iub.1510] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 04/19/2016] [Accepted: 04/24/2016] [Indexed: 01/12/2023]
Abstract
Many reports suggested that some statins are almost ineffective in reducing triglycerides or enhancing HDL-C plasma levels, although statin treatment was still efficacious in reducing LDL-C. In diabetic dyslipidemic patients, it may therefore be necessary to use a combination therapy with other drugs to achieve either LDL-C- and triglyceride-lowering or HDL-C-enhancing goals. Such ineffectiveness of statins can be attributed to their effect on the liver X receptor (LXR) which regulates the expression of the ATP-binding cassette (ABC) transporters ABCA1 and ABCG1. A decrease in the expression of these transporters eventually leads to decreased cholesterol efflux from peripheral tissues leading to low levels of HDL-C. Although manipulating the LXR pathway may complement the effects of statins, LXR synthetic ligands as T091317 have shown significant hypertriglyceridemic action which limits their use. We recently found that the antidiabetic drug vildagliptin stimulates LXR expression leading to increased ABCB1/ABCG1 expression which improves cholesterol efflux from adipocytes. Therefore, a combination of vildagliptin and statin may provide a solution without the hypertriglyceridemic action observed with LXR agonist. We hypothesize that a combination of vildagliptin and pravastatin will improve cholesterol efflux in adipocytes. Statin-treated 3T3-L1 adipocytes were treated with vildagliptin, and the expression of LXR-ABCA1/ABCG1 cascade and the cholesterol efflux were then determined. Our data indicate that a combination of vildagliptin and pravastatin significantly induces the expression of LXR-ABCA1/ABCG1 cascade and improves cholesterol efflux (P > 0.05) in adipocytes. Our data may explain, at least in part, the improvement in HDL-C levels observed in patients receiving both medications. © 2016 IUBMB Life, 68(7):535-543, 2016.
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Affiliation(s)
- Ahmed M Mostafa
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA.,Department of Biochemistry, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Nadia M Hamdy
- Department of Biochemistry, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
| | - Sherif Z Abdel-Rahman
- Maternal-Fetal Pharmacology and Bio-Development Laboratories, Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, TX, USA
| | - Hala O El-Mesallamy
- Department of Biochemistry, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
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Yoon H, Flores LF, Kim J. MicroRNAs in brain cholesterol metabolism and their implications for Alzheimer's disease. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:2139-2147. [PMID: 27155217 DOI: 10.1016/j.bbalip.2016.04.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 04/28/2016] [Accepted: 04/29/2016] [Indexed: 01/01/2023]
Abstract
Cholesterol is important for various neuronal functions in the brain. Brain has elaborate regulatory mechanisms to control cholesterol metabolism that are distinct from the mechanisms in periphery. Interestingly, dysregulation of the cholesterol metabolism is strongly associated with a number of neurodegenerative diseases. MicroRNAs are short non-coding RNAs acting as post-transcriptional gene regulators. Recently, several microRNAs are demonstrated to be involved in regulating cholesterol metabolism in the brain. This article reviews the regulatory mechanisms of cellular cholesterol homeostasis in the brain. In addition, we discuss the role of microRNAs in brain cholesterol metabolism and their potential implications for the treatment of Alzheimer's disease. This article is part of a special issue entitled: MicroRNAs and lipid/energy metabolism and related diseases edited by Carlos Fernández-Hernando and Yajaira Suárez.
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Affiliation(s)
- Hyejin Yoon
- Neurobiology of Disease Graduate Program, Mayo Graduate School, Jacksonville, FL, United States; Department of Neuroscience, Mayo Clinic, Jacksonville, FL, United States
| | - Luis F Flores
- Biochemistry and Molecular Biology Graduate Program, Mayo Graduate School, Jacksonville, FL, United States
| | - Jungsu Kim
- Neurobiology of Disease Graduate Program, Mayo Graduate School, Jacksonville, FL, United States; Department of Neuroscience, Mayo Clinic, Jacksonville, FL, United States.
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Modulation of microRNA Expression in Subjects with Metabolic Syndrome and Decrease of Cholesterol Efflux from Macrophages via microRNA-33-Mediated Attenuation of ATP-Binding Cassette Transporter A1 Expression by Statins. PLoS One 2016; 11:e0154672. [PMID: 27139226 PMCID: PMC4854384 DOI: 10.1371/journal.pone.0154672] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Accepted: 04/18/2016] [Indexed: 01/14/2023] Open
Abstract
Metabolic syndrome (MetS) is a complicated health problem that encompasses a variety of metabolic disorders. In this study, we analyzed the relationship between the major biochemical parameters associated with MetS and circulating levels of microRNA (miR)-33, miR-103, and miR-155. We found that miRNA-33 levels were positively correlated with levels of fasting blood glucose, glycosylated hemoglobin A1c, total cholesterol, LDL-cholesterol, and triacylglycerol, but negatively correlated with HDL-cholesterol levels. In the cellular study, miR-33 levels were increased in macrophages treated with high glucose and cholesterol-lowering drugs atorvastatin and pitavastatin. miR-33 has been reported to play an essential role in cholesterol homeostasis through ATP-binding cassette transporter A1 (ABCA1) regulation and reverse cholesterol transport. However, the molecular mechanism underlying the linkage between miR-33 and statin treatment remains unclear. In the present study, we investigated whether atorvastatin and pitavastatin exert their functions through the modulation of miR-33 and ABCA1-mediated cholesterol efflux from macrophages. The results showed that treatment of the statins up-regulated miR-33 expression, but down-regulated ABCA1 mRNA levels in RAW264.7 cells and bone marrow-derived macrophages. Statin-mediated ABCA1 regulation occurs at the post-transcriptional level through targeting of the 3′-UTR of the ABCA1 transcript by miR-33. Additionally, we found significant down-regulation of ABCA1 protein expression in macrophages treated with statins. Finally, we showed that high glucose and statin treatment significantly suppressed cholesterol efflux from macrophages. These findings have highlighted the complexity of statins, which may exert detrimental effects on metabolic abnormalities through regulation of miR-33 target genes.
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43
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Howe V, Sharpe LJ, Alexopoulos SJ, Kunze SV, Chua NK, Li D, Brown AJ. Cholesterol homeostasis: How do cells sense sterol excess? Chem Phys Lipids 2016; 199:170-178. [PMID: 26993747 DOI: 10.1016/j.chemphyslip.2016.02.011] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 02/27/2016] [Indexed: 12/23/2022]
Abstract
Cholesterol is vital in mammals, but toxic in excess. Consequently, elaborate molecular mechanisms have evolved to maintain this sterol within narrow limits. How cells sense excess cholesterol is an intriguing area of research. Cells sense cholesterol, and other related sterols such as oxysterols or cholesterol synthesis intermediates, and respond to changing levels through several elegant mechanisms of feedback regulation. Cholesterol sensing involves both direct binding of sterols to the homeostatic machinery located in the endoplasmic reticulum (ER), and indirect effects elicited by sterol-dependent alteration of the physical properties of membranes. Here, we examine the mechanisms employed by cells to maintain cholesterol homeostasis.
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Affiliation(s)
- Vicky Howe
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Laura J Sharpe
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Stephanie J Alexopoulos
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Sarah V Kunze
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Ngee Kiat Chua
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Dianfan Li
- National Center for Protein Sciences, State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Andrew J Brown
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia.
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Abstract
The mechanisms or causes of pancreatic β-cell death as well as impaired insulin secretion, which are the principal events of diabetic etiopathology, are largely unknown. Diabetic complications are known to be associated with abnormal plasma lipid profile, mainly elevated level of cholesterol and free fatty acids. However, in recent years, elevated plasma cholesterol has been implicated as a primary modulator of pancreatic β-cell functions as well as death. High-cholesterol diet in animal models or excess cholesterol in pancreatic β-cell causes transporter desensitization and results in morphometric changes in insulin granules. Moreover, cholesterol is also held responsible to cause oxidative stress, mitochondrial dysfunction, and activation of proapoptotic markers leading to β-cell death. The present review focuses on the pathways and molecularevents that occur in the β-cell under the influence of excess cholesterol that hampers the basal physiology of the cell leading to the progression of diabetes.
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45
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Driver AM, Kratz LE, Kelley RI, Stottmann RW. Altered cholesterol biosynthesis causes precocious neurogenesis in the developing mouse forebrain. Neurobiol Dis 2016; 91:69-82. [PMID: 26921468 DOI: 10.1016/j.nbd.2016.02.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 02/08/2016] [Accepted: 02/23/2016] [Indexed: 11/29/2022] Open
Abstract
We previously reported a mutation in the cholesterol biosynthesis gene, hydroxysteroid (17-beta) dehydrogenase 7 (Hsd17b7(rudolph)), that results in striking embryonic forebrain dysgenesis. Here we describe abnormal patterns of neuroprogenitor proliferation in the mutant forebrain, namely, a decrease in mitotic cells within the ventricular zone (VZ) and an increase through the remainder of the cortex by E11.5. Further evidence suggests mutant cells undergo abnormal interkinetic nuclear migration (IKNM). Furthermore, intermediate progenitors are increased at the expense of apical progenitors by E12.5, and post-mitotic neurons are expanded by E14.5. In vitro primary neuron culture further supports our model of accelerated cortical differentiation in the mutant. Combined administration of a statin and dietary cholesterol in utero achieved partial reversal of multiple developmental abnormalities in the Hsd17b7(rudolph) embryo, including the forebrain. These results suggest that abnormally increased levels of specific cholesterol precursors in the Hsd17b7(rudolph) embryo cause cortical dysgenesis by altering patterns of neurogenesis.
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Affiliation(s)
- Ashley M Driver
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Lisa E Kratz
- Kennedy Krieger Institute, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Richard I Kelley
- Department of Genetics & Genomics, Boston Children's Hospital, Boston, MA 02115, USA
| | - Rolf W Stottmann
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
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Statin-induced decrease in ATP-binding cassette transporter A1 expression via microRNA33 induction may counteract cholesterol efflux to high-density lipoprotein. Cardiovasc Drugs Ther 2015; 29:7-14. [PMID: 25749868 DOI: 10.1007/s10557-015-6570-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
PURPOSE Cholesterol efflux from macrophages to HDL, measured in vitro, is augmented by treatment with agents which raise HDL cholesterol. In vitro, cholesterol depletion by statins is known to trigger a positive feedback on the cholesterol synthetic pathway via sterol regulatory element-binding protein (SREBP) transcription and changes in expression of SREBP regulated genes including microRNA33 (miR33) which is co-transcribed with SREBP and down-regulates ABCA1 and ABCG1 expression. METHODS We investigated whether miR33 up-regulation, associated with SREBP increased transcription by statins, reduces macrophage ATP-binding cassette (ABC) transporter expression, thereby decreasing HDL-mediated cholesterol efflux at the tissue level. RESULTS In human macrophage THP-1 cells cholesterol-loaded with acetylated LDL, incubation with 1 μM atorvastatin increased miR33 by 33 % (P < 0.05), and decreased ABCA1 messenger RNA (mRNA) and ABCG1 mRNA by 47 % (P < 0.05) and 27 % (NS), respectively. In J774A.1 mouse macrophage, labelled with 3H-cholesterol, ABCA1 mRNA and ABCA1-mediated cholesterol efflux were decreased by 1 μM statin: simvastatin > pitavastatin > atorvastatin > rosuvastatin > pravastatin. HDL incubated with rhCETP and dalcetrapib increased ABCA1-mediated cholesterol efflux. However, incremental simvastatin concentrations decreased cholesterol efflux to HDL treated with rhCETP and dalcetrapib. When HDL was incubated with rhCETP, addition of dalcetrapib augmented ABCA1-mediated cholesterol efflux from J774A.1 macrophages. However, simvastatin ≥1 μM virtually eliminated any HDL-ABCA1-mediated cholesterol efflux and any augmentation of that process by dalcetrapib. CONCLUSIONS In vitro, statins increase miR33 expression, and decrease ABCA1 expression and cholesterol efflux from peripheral tissues; this may counteract the potential benefit of agents that raise HDL and apolipoprotein A-I in statin-treated patients.
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Obeidat M, Fishbane N, Nie Y, Chen V, Hollander Z, Tebbutt SJ, Bossé Y, Ng RT, Miller BE, McManus B, Rennard S, Paré PD, Sin DD. The Effect of Statins on Blood Gene Expression in COPD. PLoS One 2015; 10:e0140022. [PMID: 26462087 PMCID: PMC4604084 DOI: 10.1371/journal.pone.0140022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 09/19/2015] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND COPD is currently the fourth leading cause of death worldwide. Statins are lipid lowering agents with documented cardiovascular benefits. Observational studies have shown that statins may have a beneficial role in COPD. The impact of statins on blood gene expression from COPD patients is largely unknown. OBJECTIVE Identify blood gene signature associated with statin use in COPD patients, and the pathways underpinning this signature that could explain any potential benefits in COPD. METHODS Whole blood gene expression was measured on 168 statin users and 451 non-users from the ECLIPSE study using the Affymetrix Human Gene 1.1 ST microarray chips. Factor Analysis for Robust Microarray Summarization (FARMS) was used to process the expression data. Differential gene expression analysis was undertaken using the Linear Models for Microarray data (Limma) package adjusting for propensity score and surrogate variables. Similarity of the expression signal with published gene expression profiles was performed in ProfileChaser. RESULTS 25 genes were differentially expressed between statin users and non-users at an FDR of 10%, including LDLR, CXCR2, SC4MOL, FAM108A1, IFI35, FRYL, ABCG1, MYLIP, and DHCR24. The 25 genes were significantly enriched in cholesterol homeostasis and metabolism pathways. The resulting gene signature showed correlation with Huntington's disease, Parkinson's disease and acute myeloid leukemia gene signatures. CONCLUSION The blood gene signature of statins' use in COPD patients was enriched in cholesterol homeostasis pathways. Further studies are needed to delineate the role of these pathways in lung biology.
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Affiliation(s)
- Ma’en Obeidat
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
| | - Nick Fishbane
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
| | - Yunlong Nie
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
| | - Virginia Chen
- Prevention of Organ Failure (PROOF) Centre of Excellence, Vancouver, BC, Canada
| | - Zsuzsanna Hollander
- Prevention of Organ Failure (PROOF) Centre of Excellence, Vancouver, BC, Canada
| | - Scott J. Tebbutt
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
- Prevention of Organ Failure (PROOF) Centre of Excellence, Vancouver, BC, Canada
- Respiratory Division, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Yohan Bossé
- Institut universitaire de cardiologie et de pneumologie de Québec, Department of Molecular Medicine, Laval University, Québec, Canada
| | - Raymond T. Ng
- Prevention of Organ Failure (PROOF) Centre of Excellence, Vancouver, BC, Canada
| | - Bruce E. Miller
- Respiratory Therapy Area Unit, GlaxoSmithKline R&D, King of Prussia, Pennsylvania, United States of America
| | - Bruce McManus
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
- Prevention of Organ Failure (PROOF) Centre of Excellence, Vancouver, BC, Canada
| | - Stephen Rennard
- Division of Pulmonary and Critical Care Medicine, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Peter D. Paré
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
- Respiratory Division, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Don D. Sin
- The University of British Columbia Centre for Heart Lung Innovation, St Paul’s Hospital, Vancouver, BC, Canada
- Respiratory Division, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
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48
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Honsho M, Abe Y, Fujiki Y. Dysregulation of Plasmalogen Homeostasis Impairs Cholesterol Biosynthesis. J Biol Chem 2015; 290:28822-33. [PMID: 26463208 DOI: 10.1074/jbc.m115.656983] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Indexed: 11/06/2022] Open
Abstract
Plasmalogen biosynthesis is regulated by modulating fatty acyl-CoA reductase 1 stability in a manner dependent on cellular plasmalogen level. However, physiological significance of the regulation of plasmalogen biosynthesis remains unknown. Here we show that elevation of the cellular plasmalogen level reduces cholesterol biosynthesis without affecting the isoprenylation of proteins such as Rab and Pex19p. Analysis of intermediate metabolites in cholesterol biosynthesis suggests that the first oxidative step in cholesterol biosynthesis catalyzed by squalene monooxygenase (SQLE), an important regulator downstream HMG-CoA reductase in cholesterol synthesis, is reduced by degradation of SQLE upon elevation of cellular plasmalogen level. By contrast, the defect of plasmalogen synthesis causes elevation of SQLE expression, resulting in the reduction of 2,3-epoxysqualene required for cholesterol synthesis, hence implying a novel physiological consequence of the regulation of plasmalogen biosynthesis.
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Affiliation(s)
- Masanori Honsho
- From the Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Yuichi Abe
- From the Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Yukio Fujiki
- From the Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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49
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Haga S, Nakano M, Ishizaki H, Roh SG, Katoh K. Expression of α-tocopherol–associated genes and α-tocopherol accumulation in Japanese Black (Wagyu) calves with and without α-tocopherol supplementation1. J Anim Sci 2015; 93:4048-57. [DOI: 10.2527/jas.2015-9106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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50
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Baskaran G, Salvamani S, Ahmad SA, Shaharuddin NA, Pattiram PD, Shukor MY. HMG-CoA reductase inhibitory activity and phytocomponent investigation of Basella alba leaf extract as a treatment for hypercholesterolemia. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:509-17. [PMID: 25609924 PMCID: PMC4298350 DOI: 10.2147/dddt.s75056] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The enzyme 3-hydroxy-3-methyl-glutaryl-coenzyme A (HMG-CoA) reductase is the key enzyme of the mevalonate pathway that produces cholesterol. Inhibition of HMG-CoA reductase reduces cholesterol biosynthesis in the liver. Synthetic drugs, statins, are commonly used for the treatment of hypercholesterolemia. Due to the side effects of statins, natural HMG-CoA reductase inhibitors of plant origin are needed. In this study, 25 medicinal plant methanol extracts were screened for anti-HMG-CoA reductase activity. Basella alba leaf extract showed the highest inhibitory effect at about 74%. Thus, B. alba was examined in order to investigate its phytochemical components. Gas chromatography with tandem mass spectrometry and reversed phase high-performance liquid chromatography analysis revealed the presence of phenol 2,6-bis(1,1-dimethylethyl), 1-heptatriacotanol, oleic acid, eicosyl ester, naringin, apigenin, luteolin, ascorbic acid, and α-tocopherol, which have been reported to possess antihypercholesterolemic effects. Further investigation of in vivo models should be performed in order to confirm its potential as an alternative treatment for hypercholesterolemia and related cardiovascular diseases.
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Affiliation(s)
- Gunasekaran Baskaran
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Shamala Salvamani
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Siti Aqlima Ahmad
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Noor Azmi Shaharuddin
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Selangor, Malaysia
| | - Parveen Devi Pattiram
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, Selangor, Malaysia
| | - Mohd Yunus Shukor
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Selangor, Malaysia
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