1
|
Wang D, Huang J, Gui T, Yang Y, Feng T, Tzvetkov NT, Xu T, Gai Z, Zhou Y, Zhang J, Atanasov AG. SR-BI as a target of natural products and its significance in cancer. Semin Cancer Biol 2020; 80:18-38. [PMID: 31935456 DOI: 10.1016/j.semcancer.2019.12.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/25/2019] [Accepted: 12/30/2019] [Indexed: 02/07/2023]
Abstract
Scavenger receptor class B type I (SR-BI) protein is an integral membrane glycoprotein. SR-BI is emerging as a multifunctional protein, which regulates autophagy, efferocytosis, cell survival and inflammation. It is well known that SR-BI plays a critical role in lipoprotein metabolism by mediating cholesteryl esters selective uptake and the bi-directional flux of free cholesterol. Recently, SR-BI has also been identified as a potential marker for cancer diagnosis, prognosis, or even a treatment target. Natural products are a promising source for the discovery of new drug leads. Multiple natural products were identified to regulate SR-BI protein expression. There are still a number of challenges in modulating SR-BI expression in cancer and in using natural products for modulation of such protein expression. In this review, our purpose is to discuss the relationship between SR-BI protein and cancer, and the molecular mechanisms regulating SR-BI expression, as well as to provide an overview of natural products that regulate SR-BI expression.
Collapse
Affiliation(s)
- Dongdong Wang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Jiansheng Huang
- Department of Medicine, Vanderbilt University Medical Center, 318 Preston Research Building, 2200 Pierce Avenue, Nashville, Tennessee, 37232, USA
| | - Ting Gui
- Key Laboratory of Traditional Chinese Medicine for Classical Theory, Ministry of Education, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Yaxin Yang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Tingting Feng
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Huaxi university town, 550025, Guiyang, China
| | - Nikolay T Tzvetkov
- Department of Biochemical Pharmacology and Drug Design, Institute of Molecular Biology "Roumen Tsanev", Bulgarian Academy of Sciences, 21 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - Tao Xu
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Zhibo Gai
- Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ying Zhou
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Huaxi university town, 550025, Guiyang, China.
| | - Jingjie Zhang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China.
| | - Atanas G Atanasov
- Department of Molecular Biology, Institute of Genetics and Animal Breeding of the Polish Academy of Sciences, 05-552, Jastrzębiec, Poland; Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria; Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria; Ludwig Boltzmann Institute for Digital Health and Patient Safety, Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria.
| |
Collapse
|
2
|
Sharma B, Agnihotri N. Role of cholesterol homeostasis and its efflux pathways in cancer progression. J Steroid Biochem Mol Biol 2019; 191:105377. [PMID: 31063804 DOI: 10.1016/j.jsbmb.2019.105377] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/09/2019] [Accepted: 05/04/2019] [Indexed: 12/27/2022]
Abstract
Tumor cells show high avidity for cholesterol in order to support their inherent nature to divide and proliferate. This results in the rewiring of cholesterol homeostatic pathways by influencing not only de novo synthesis but also uptake or efflux pathways of cholesterol. Recent findings have pointed towards the importance of cholesterol efflux in tumor pathogenesis. Cholesterol efflux is the first and foremost step in reverse cholesterol transport and any perturbation in this pathway may lead to the accumulation of intracellular cholesterol, thereby altering the cellular equilibrium. This review addresses the different mechanisms of cholesterol efflux from the cell and highlights their role and regulation in context to tumor development. There are four different routes by which cholesterol can be effluxed from the cell namely, 1) passive diffusion of cholesterol to mature HDL particles, 2) SR-B1 mediated facilitated diffusion, 3) Active efflux to apo A1 via ABCA1 and 4) ABCG1 mediated efflux to mature HDL. These molecular players facilitating cholesterol efflux are engaged in a complex interplay with different signaling pathways. Thus, an understanding of the efflux pathways, their regulation and cross-talk with signaling molecules may provide novel prognostic markers and therapeutic targets to combat the onset of carcinogenesis.
Collapse
Affiliation(s)
- Bhoomika Sharma
- Department of Biochemistry, BMS-Block II, Panjab University, Sector-25, Chandigarh, 160014, India.
| | - Navneet Agnihotri
- Department of Biochemistry, BMS-Block II, Panjab University, Sector-25, Chandigarh, 160014, India.
| |
Collapse
|
3
|
Wong NKP, Nicholls SJ, Tan JTM, Bursill CA. The Role of High-Density Lipoproteins in Diabetes and Its Vascular Complications. Int J Mol Sci 2018; 19:E1680. [PMID: 29874886 PMCID: PMC6032203 DOI: 10.3390/ijms19061680] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 05/24/2018] [Accepted: 05/31/2018] [Indexed: 02/06/2023] Open
Abstract
Almost 600 million people are predicted to have diabetes mellitus (DM) by 2035. Diabetic patients suffer from increased rates of microvascular and macrovascular complications, associated with dyslipidaemia, impaired angiogenic responses to ischaemia, accelerated atherosclerosis, and inflammation. Despite recent treatment advances, many diabetic patients remain refractory to current approaches, highlighting the need for alternative agents. There is emerging evidence that high-density lipoproteins (HDL) are able to rescue diabetes-related vascular complications through diverse mechanisms. Such protective functions of HDL, however, can be rendered dysfunctional within the pathological milieu of DM, triggering the development of vascular complications. HDL-modifying therapies remain controversial as many have had limited benefits on cardiovascular risk, although more recent trials are showing promise. This review will discuss the latest data from epidemiological, clinical, and pre-clinical studies demonstrating various roles for HDL in diabetes and its vascular complications that have the potential to facilitate its successful translation.
Collapse
Affiliation(s)
- Nathan K P Wong
- Immunobiology Research Group, The Heart Research Institute, 7 Eliza Street, Newtown, NSW 2042, Australia.
- Discipline of Medicine, The University of Sydney School of Medicine, Camperdown, NSW 2006, Australia.
- Heart Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia.
| | - Stephen J Nicholls
- Heart Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia.
- Adelaide Medical School, Faculty of Health & Medical Sciences, University of Adelaide, Adelaide, SA 5000, Australia.
| | - Joanne T M Tan
- Immunobiology Research Group, The Heart Research Institute, 7 Eliza Street, Newtown, NSW 2042, Australia.
- Discipline of Medicine, The University of Sydney School of Medicine, Camperdown, NSW 2006, Australia.
- Heart Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia.
- Adelaide Medical School, Faculty of Health & Medical Sciences, University of Adelaide, Adelaide, SA 5000, Australia.
| | - Christina A Bursill
- Immunobiology Research Group, The Heart Research Institute, 7 Eliza Street, Newtown, NSW 2042, Australia.
- Discipline of Medicine, The University of Sydney School of Medicine, Camperdown, NSW 2006, Australia.
- Heart Health Theme, South Australian Health and Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia.
- Adelaide Medical School, Faculty of Health & Medical Sciences, University of Adelaide, Adelaide, SA 5000, Australia.
| |
Collapse
|
4
|
Nafari M, Irani S, Vaziri F, Gharibzadeh S, Sakhaee F, Khazeni M, Kalhor N, Jamnani FR, Siadat SD, Fateh A. Correlation of CD81 and SCARB1 polymorphisms on virological responses in Iranian patients with chronic hepatitis C virus genotype 1. INFECTION GENETICS AND EVOLUTION 2018; 62:296-303. [PMID: 29715527 DOI: 10.1016/j.meegid.2018.04.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 04/23/2018] [Accepted: 04/27/2018] [Indexed: 12/11/2022]
Abstract
The cluster of differentiation 81 (CD81) and scavenger receptor class B member 1 (SCARB1) plays an important role in the entry of hepatitis C virus (HCV). We assessed the correlation of five single nucleotide polymorphisms (SNPs) of CD81 (rs800136, rs2651842, rs2522012, rs800146, and rs708564) and SCARB1 rs10846744 polymorphisms with treatment responses in 395 treatment-naïve patients with chronic HCV (CHC) genotype 1 treated with pegylated interferon-α and ribavirin (pegIFN-α/RBV). The frequency of rapid virologic response (RVR), complete early virologic response (cEVR) and sustained virologic response (SVR) were 57.2%, 55.2%, and 58.2%, respectively. RVR, cEVR, and SVR were significantly associated with CD81 rs800136 (CC), CD81 rs2651842 (AA), CD81 rs708564 (TT), and SCARB1 rs10846744 (CC). High rates of RVR, cEVR, and SVR were reported for the CD81 rs800136 (CC), CD81 rs2651842 (AA), and CD81 rs708564 (TT) genotypes when correlated with higher levels of low-density lipoprotein (LDL) and lower levels of high-density lipoprotein (HDL) as well as lower levels of HDL and LDL in the SCARB1 rs10846744 (CC) genotype. In addition, patients with GG genotype had higher fasting blood glucose (FBS) level than those with CC genotype. In conclusion, CD81 and SCARB1 SNPs may serve as powerful predictor factors for treatment responses in CHC patients, and this effect is correlated with serum lipoprotein and FBS levels.
Collapse
Affiliation(s)
- Milad Nafari
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shiva Irani
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Farzam Vaziri
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Safoora Gharibzadeh
- Research Centre for Emerging and Reemerging infectious diseases, Pasteur Institute of Iran, Tehran, Iran; Department of Epidemiology and Biostatistics, Pasteur Institute of Iran, Tehran, Iran
| | - Fatemeh Sakhaee
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran
| | - Mohammad Khazeni
- Department of Virology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Naser Kalhor
- Stem Cell Laboratory, The Academic Center for Education, Culture and Research (ACECR), Qom Branch, Qom, Iran
| | - Fatemeh Rahimi Jamnani
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Seyed Davar Siadat
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Abolfazl Fateh
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran.
| |
Collapse
|
5
|
Shao YX, Xu XX, Li YY, Qi XM, Wang K, Wu YG, Meng XM. Paeoniflorin inhibits high glucose-induced macrophage activation through TLR2-dependent signal pathways. JOURNAL OF ETHNOPHARMACOLOGY 2016; 193:377-386. [PMID: 27566204 DOI: 10.1016/j.jep.2016.08.035] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Revised: 08/11/2016] [Accepted: 08/22/2016] [Indexed: 06/06/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Paeoniflorin(PF), extracted from the root peeled of Paeonia lactiflora Pall(Family: Ranunculaceae), has therapeutic potential in many animal models of inflammatory diseases. AIM OF THE STUDY Although the anti-inflammatory efficacy of PF has been well illustrated in several animal models, whether it could attenuate diabetic nephropathy and detailed mechanisms are still obscure. Till now, accumulating evidence has proposed the pivotal role of toll-like receptors (TLRs) in renal inflammation in diabetic patients. In this setting, the current study aimed to investigate the effects and underlying mechanism of PF on high glucose-induced activation of toll like-receptor 2 (TLR2) signaling in macrophages. MATERIALS AND METHODS Bone marrow-derived macrophages (BMDM) were isolated from male Tlr2tm1kir (TLR2-/-) mice and wild-type littermates (C57BL/6JWT). The level of TLR2 and activation of downstream signaling were evaluated in response to 30mmol/L high glucose (HG)-containing medium. Macrophages behaviors, which include cell viability, migration and inflammatory cytokines production, were also determined. RESULTS PF suppressed HG-induced production of TLR2, activation of downstream signaling and synthesis of inducible nitric oxide synthase (iNOS). PF could further inhibit MyD88-dependent pathway in HG-induced models in which TLR2 was knocked out. Moreover, deletion of TLR2 inhibited the HG-induced activation of MyD88-dependent pathway, but not TIR domain containing adapter inducing interferon-β (Trif) signal pathway in BMDMs. As HG stimulation polarizes macrophages into M1 phenotype, treatment of PF or knockout of TLR2 significantly reduces M1 markers on the membrane of macrophages. Additionally, levels of inflammatory cytokines and iNOS were remarkably reduced in response to PF or TLR2 deficiency. CONCLUSION Collectively, these data demonstrated that HG activated macrophages primarily through TLR2-dependent mechanisms which aggravated the severity of renal inflammation and eventually contributed to DN. Additionally, PF might be applied as a potential therapeutic agent in the battle against progressive DN.
Collapse
Affiliation(s)
- Yun-Xia Shao
- Department of Nephropathy, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, China
| | - Xin-Xing Xu
- Department of Nephropathy, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, China
| | - Yuan-Yuan Li
- Department of Nephropathy, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, China
| | - Xiang-Ming Qi
- Department of Nephropathy, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, China
| | - Kun Wang
- Department of Nephropathy, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, China
| | - Yong-Gui Wu
- Department of Nephropathy, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230032, China.
| | - Xiao-Ming Meng
- School of Pharmacy, Anhui Medical University, Hefei, Anhui 230032, China.
| |
Collapse
|
6
|
Gutierrez-Pajares JL, Ben Hassen C, Chevalier S, Frank PG. SR-BI: Linking Cholesterol and Lipoprotein Metabolism with Breast and Prostate Cancer. Front Pharmacol 2016; 7:338. [PMID: 27774064 PMCID: PMC5054001 DOI: 10.3389/fphar.2016.00338] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 09/12/2016] [Indexed: 12/16/2022] Open
Abstract
Studies have demonstrated the significant role of cholesterol and lipoprotein metabolism in the progression of cancer. The SCARB1 gene encodes the scavenger receptor class B type I (SR-BI), which is an 82-kDa glycoprotein with two transmembrane domains separated by a large extracellular loop. SR-BI plays an important role in the regulation of cholesterol exchange between cells and high-density lipoproteins. Accordingly, hepatic SR-BI has been shown to play an essential role in the regulation of the reverse cholesterol transport pathway, which promotes the removal and excretion of excess body cholesterol. In the context of atherosclerosis, SR-BI has been implicated in the regulation of intracellular signaling, lipid accumulation, foam cell formation, and cellular apoptosis. Furthermore, since lipid metabolism is a relevant target for cancer treatment, recent studies have focused on examining the role of SR-BI in this pathology. While signaling pathways have initially been explored in non-tumoral cells, studies with cancer cells have now demonstrated SR-BI's function in tumor progression. In this review, we will discuss the role of SR-BI during tumor development and malignant progression. In addition, we will provide insights into the transcriptional and post-transcriptional regulation of the SCARB1 gene. Overall, studying the role of SR-BI in tumor development and progression should allow us to gain useful information for the development of new therapeutic strategies.
Collapse
Affiliation(s)
- Jorge L Gutierrez-Pajares
- Université François Rabelais de Tours, Faculté de Médecine-INSERM UMR1069 "Nutrition, Croissance et Cancer" Tours, France
| | - Céline Ben Hassen
- Université François Rabelais de Tours, Faculté de Médecine-INSERM UMR1069 "Nutrition, Croissance et Cancer" Tours, France
| | - Stéphan Chevalier
- Université François Rabelais de Tours, Faculté de Médecine-INSERM UMR1069 "Nutrition, Croissance et Cancer" Tours, France
| | - Philippe G Frank
- Université François Rabelais de Tours, Faculté de Médecine-INSERM UMR1069 "Nutrition, Croissance et Cancer" Tours, France
| |
Collapse
|
7
|
Hsu CS, Hsu SJ, Liu WL, Chen DS, Kao JH. Association of SCARB1 Gene Polymorphisms with Virological Response in Chronic Hepatitis C Patients Receiving Pegylated Interferon plus Ribavirin Therapy. Sci Rep 2016; 6:32303. [PMID: 27561198 PMCID: PMC4999819 DOI: 10.1038/srep32303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 08/05/2016] [Indexed: 12/26/2022] Open
Abstract
The scavenger receptor type B class I(SR-BI) is a receptor for high-density lipoproteins(HDL) and one of entry factors for hepatitis C virus(HCV). We examined the association of single nucleotide polymorphisms(SNPs) of the SCARB1 gene, which encodes SR-BI, with virologic responses to pegylated interferon-based treatment in Asian chronic hepatitis C(CHC) patients. Human genomic and clinical data were collected from 156 consecutive Taiwanese HCV genotype 1 or 2 patients who received pegylated interferon plus ribavirin therapy and 153 non-HCV healthy subjects. Three SNPs(rs10846744, rs5888, and rs3782287) of the SCARB1 gene that have been linked to humans diseases were investigated. rs10846744 rather than rs5888 or rs3782287 was associated with serum HCV RNA level and sustained virologic response(SVR) to pegylated interferon plus ribavirin therapy in CHC patients(GG vs. non-GG genotype, Adjusted Odds Ratio, 95% CI: 0.32, 0.11–0.95, P = 0.039). Among patients with IL28B rs8099917 non-TT genotypes, those with rs10846744 non-GG genotype had a higher SVR rate than those with GG genotypes. In addition, patients with GG genotype had a higher fasting blood glucose level than those with CC genotype. In conclusion, SCARB1 gene polymorphisms may serve as a potential predictor of treatment responses in CHC patients receiving interferon-based therapy. (ClinicalTrials.gov number, NCT02714712).
Collapse
Affiliation(s)
- Ching-Sheng Hsu
- Division of Gastroenterology, Department of Internal Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan.,School of Post-Baccalaureate Chinese Medicine, Tzu Chi University, Hualien, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Shih-Jer Hsu
- Department of Internal Medicine, National Taiwan University Hospital, Yun-Lin Branch, Yun-Lin County, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Wei-Liang Liu
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ding-Shinn Chen
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Internal Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan
| | - Jia-Horng Kao
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Internal Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan.,Department of Medical Research, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan.,Hepatitis Research Center, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan
| |
Collapse
|
8
|
Impaired HDL cholesterol efflux in metabolic syndrome is unrelated to glucose tolerance status: the CODAM study. Sci Rep 2016; 6:27367. [PMID: 27270665 PMCID: PMC4897620 DOI: 10.1038/srep27367] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 05/13/2016] [Indexed: 12/27/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) and metabolic syndrome (MetS) increase atherosclerotic cardiovascular disease risk. Cholesterol efflux capacity (CEC) is a key metric of the anti-atherosclerotic functionality of high-density lipoproteins (HDL). The present study aimed to delineate if T2DM and MetS cross-sectionally associate with altered CEC in a large high cardiometabolic risk population. CEC was determined from THP-1 macrophage foam cells towards apolipoprotein B-depleted plasma from 552 subjects of the CODAM cohort (288 controls, 126 impaired glucose metabolism [IGM], 138 T2DM). MetS was present in 297 participants. CEC was not different between different glucose tolerance categories but was lower in MetS (P < 0.001), at least partly attributable to lower HDL cholesterol (HDL-C) and apoA-I levels (P < 0.001 for each). Low grade inflammation was increased in IGM, T2DM and MetS as determined by a score comprising 8 different biomarkers (P < 0.05-< 0.001; n = 547). CEC inversely associated with low-grade inflammation taking account of HDL-C or apoA-I in MetS (P < 0.02), but not in subjects without MetS (interaction: P = 0.015). This study demonstrates that IGM and T2DM do not impact the HDL CEC function, while efflux is lower in MetS, partly dependent on plasma HDL-C levels. Enhanced low-grade inflammation in MetS may conceivably impair CEC even independent of HDL-C and apoA-I.
Collapse
|
9
|
Nanoparticle Targeting and Cholesterol Flux Through Scavenger Receptor Type B-1 Inhibits Cellular Exosome Uptake. Sci Rep 2015; 5:15724. [PMID: 26511855 PMCID: PMC4625174 DOI: 10.1038/srep15724] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 10/01/2015] [Indexed: 12/21/2022] Open
Abstract
Exosomes are nanoscale vesicles that mediate intercellular communication. Cellular exosome uptake mechanisms are not well defined partly due to the lack of specific inhibitors of this complex cellular process. Exosome uptake depends on cholesterol-rich membrane microdomains called lipid rafts, and can be blocked by non-specific depletion of plasma membrane cholesterol. Scavenger receptor type B-1 (SR-B1), found in lipid rafts, is a receptor for cholesterol-rich high-density lipoproteins (HDL). We hypothesized that a synthetic nanoparticle mimic of HDL (HDL NP) that binds SR-B1 and removes cholesterol through this receptor would inhibit cellular exosome uptake. In cell models, our data show that HDL NPs bind SR-B1, activate cholesterol efflux, and attenuate the influx of esterified cholesterol. As a result, HDL NP treatment results in decreased dynamics and clustering of SR-B1 contained in lipid rafts and potently inhibits cellular exosome uptake. Thus, SR-B1 and targeted HDL NPs provide a fundamental advance in studying cholesterol-dependent cellular uptake mechanisms.
Collapse
|
10
|
Key role for scavenger receptor B-I in the integrative physiology of host defense during bacterial pneumonia. Mucosal Immunol 2015; 8:559-71. [PMID: 25336169 PMCID: PMC4406784 DOI: 10.1038/mi.2014.88] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 08/16/2014] [Indexed: 02/04/2023]
Abstract
Scavenger receptor B-I (SR-BI) is a multirecognition receptor that regulates cholesterol trafficking and cardiovascular inflammation. Although it is expressed by neutrophils (PMNs) and lung-resident cells, no role for SR-BI has been defined in pulmonary immunity. Herein, we report that, compared with SR-BI(+/+) counterparts, SR-BI(-/-) mice suffer markedly increased mortality during bacterial pneumonia associated with higher bacterial burden in the lung and blood, deficient induction of the stress glucocorticoid corticosterone, higher serum cytokines, and increased organ injury. SR-BI(-/-) mice had significantly increased PMN recruitment and cytokine production in the infected airspace. This was associated with defective hematopoietic cell-dependent clearance of lipopolysaccharide from the airspace and increased cytokine production by SR-BI(-/-) macrophages. Corticosterone replacement normalized alveolar neutrophilia but not alveolar cytokines, bacterial burden, or mortality, suggesting that adrenal insufficiency derepresses PMN trafficking to the SR-BI(-/-) airway in a cytokine-independent manner. Despite enhanced alveolar neutrophilia, SR-BI(-/-) mice displayed impaired phagocytic killing. Bone marrow chimeras revealed this defect to be independent of the dyslipidemia and adrenal insufficiency of SR-BI(-/-) mice. During infection, SR-BI(-/-) PMNs displayed deficient oxidant production and CD11b externalization, and increased surface L-selectin, suggesting defective activation. Taken together, SR-BI coordinates several steps in the integrated neutrophilic host defense response to pneumonia.
Collapse
|
11
|
Cheng CI, Chen PH, Lin YC, Kao YH. High glucose activates Raw264.7 macrophages through RhoA kinase-mediated signaling pathway. Cell Signal 2015; 27:283-92. [DOI: 10.1016/j.cellsig.2014.11.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 11/08/2014] [Indexed: 11/24/2022]
|
12
|
Schmohl JU, Daub K, von Ungern-Sternberg SNI, Lindemann S, Schönberger T, Geisler T, Gawaz M, Seizer P. Differential MMP-9 activity in CD34⁺progenitor cell-derived foam cells from diabetic and normoglycemic patients. Herz 2013; 40 Suppl 3:269-76. [PMID: 24305990 DOI: 10.1007/s00059-013-4012-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 10/19/2013] [Accepted: 10/21/2013] [Indexed: 11/24/2022]
Abstract
BACKGROUND Upon coincubation with platelet aggregates, CD34(+) progenitor cells have the potential to differentiate into foam cells. There is evidence that progenitor cells from diabetic and nondiabetic patients have different properties, which may affect the patients' prognosis. In this study we investigated an in vitro model of foam cell formation based on patient-derived CD34(+) progenitor cells. We analyzed the growth characteristics as well as the M-CSF-release and matrix metalloproteinase (MMP) synthesis from CD34(+) progenitor cell-derived foam cells originating from diabetic and nondiabetic patients. METHODS AND RESULTS Bone marrow samples were obtained from 38 patients who were elected for thoracic surgery. CD34(+) progenitor cells from diabetic and nondiabetic patients were isolated and incubated with platelets from healthy volunteers. Foam cell formation was confirmed by immunostaining (CD68) and quantified by light microscopy. Whereas the absolute number of foam cells was not affected, the negative slope in the growth curve was seen significantly later in the diabetic group. In supernatants derived from"diabetic" CD34(+) progenitor cells, MMP-9 was significantly enhanced, whereas MMP-2 activity or M-CSF-release was not affected significantly. CONCLUSION In a coculture model of CD34(+) progenitor cells with platelets, we show for the first time that"diabetic" CD34(+) progenitor cells exhibit functional differences in their differentiation to foam cells concerning growth characteristics and release of MMP-9.
Collapse
Affiliation(s)
- J U Schmohl
- Medizinische Klinik II, Hämatologie, Onkologie, Immunologie, Rheumatologie und Pulmologie, Eberhard Karls University of Tübingen, Otfried-Müller-Str. 10, 72076, Tübingen, Germany,
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Gaudreault N, Kumar N, Olivas VR, Eberlé D, Stephens K, Raffai RL. Hyperglycemia impairs atherosclerosis regression in mice. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:1981-1992. [PMID: 24113453 DOI: 10.1016/j.ajpath.2013.08.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 07/23/2013] [Accepted: 08/12/2013] [Indexed: 02/01/2023]
Abstract
Diabetic patients are known to be more susceptible to atherosclerosis and its associated cardiovascular complications. However, the effects of hyperglycemia on atherosclerosis regression remain unclear. We hypothesized that hyperglycemia impairs atherosclerosis regression by modulating the biological function of lesional macrophages. HypoE (Apoe(h/h)Mx1-Cre) mice express low levels of apolipoprotein E (apoE) and develop atherosclerosis when fed a high-fat diet. Atherosclerosis regression occurs in these mice upon plasma lipid lowering induced by a change in diet and the restoration of apoE expression. We examined the morphological characteristics of regressed lesions and assessed the biological function of lesional macrophages isolated with laser-capture microdissection in euglycemic and hyperglycemic HypoE mice. Hyperglycemia induced by streptozotocin treatment impaired lesion size reduction (36% versus 14%) and lipid loss (38% versus 26%) after the reversal of hyperlipidemia. However, decreases in lesional macrophage content and remodeling in both groups of mice were similar. Gene expression analysis revealed that hyperglycemia impaired cholesterol transport by modulating ATP-binding cassette A1, ATP-binding cassette G1, scavenger receptor class B family member (CD36), scavenger receptor class B1, and wound healing pathways in lesional macrophages during atherosclerosis regression. Hyperglycemia impairs both reduction in size and loss of lipids from atherosclerotic lesions upon plasma lipid lowering without significantly affecting the remodeling of the vascular wall.
Collapse
Affiliation(s)
- Nathalie Gaudreault
- Surgical Service, VA Medical Center San Francisco, San Francisco, California; Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Francisco, San Francisco, California
| | - Nikit Kumar
- Surgical Service, VA Medical Center San Francisco, San Francisco, California; Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Francisco, San Francisco, California
| | - Victor R Olivas
- Surgical Service, VA Medical Center San Francisco, San Francisco, California; Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Francisco, San Francisco, California
| | - Delphine Eberlé
- Surgical Service, VA Medical Center San Francisco, San Francisco, California; Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Francisco, San Francisco, California
| | - Kyle Stephens
- Surgical Service, VA Medical Center San Francisco, San Francisco, California; Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Francisco, San Francisco, California
| | - Robert L Raffai
- Surgical Service, VA Medical Center San Francisco, San Francisco, California; Division of Vascular and Endovascular Surgery, Department of Surgery, University of California San Francisco, San Francisco, California.
| |
Collapse
|
14
|
Nicod N, Parker RS. Vitamin E secretion by Caco-2 monolayers to APOA1, but not to HDL, is vitamer selective. J Nutr 2013; 143:1565-72. [PMID: 23946344 PMCID: PMC3771812 DOI: 10.3945/jn.113.176834] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The aim of this study was to characterize the pathways of basolateral secretion of common dietary tocopherols from polarized Caco-2 monolayers, a model of intestinal absorption. Given differences in structure and physical properties, we hypothesized that secretion may differ between different forms of vitamin E, thus potentially contribute to the selectivity seen in vivo. Monolayers were incubated apically and simultaneously with 10 μmol/L α-, γ-, and δ-tocopherol (1:1:1) in lipid micelles. Treatment with the microsomal triglyceride transfer protein inhibitor BMS201038 revealed that the triglyceride-rich particle secretory pathway (apolipoprotein B-dependent pathway) accounted for ~ 80% of total tocopherol secretion, without selectivity among the three forms of vitamin E. Apolipoprotein B-independent secretion of tocopherols (and cholesterol) was greatly enhanced by the liver X receptor agonist T0901317. T0901317 induced ATP-binding cassette transporter A1 (ABCA1) protein expression and basolateral secretion of tocopherols to apolipoprotein A1. ABCA1-dependent secretion demonstrated vitamer selectivity such that efficiency of secretion of α- and γ-tocopherols exceeded that of δ-tocopherol. Basal addition of HDL stimulated vitamin E secretion but without selectivity among the three forms, whereas LDL had no effect. Basal addition of scavenger receptor class B member I (SR-BI) blocking antibody, which inhibits the interaction between SR-BI and HDL, increased basal accumulation of all tocopherols, demonstrating a role for SR-BI in cellular re-uptake of secreted vitamin E. These findings demonstrated that vitamin E and cholesterol utilize common pathways of secretion and that secretion via the ABCA1 pathway favors certain forms of vitamin E.
Collapse
|
15
|
Chang YC, Sheu WHH, Chien YS, Tseng PC, Lee WJ, Chiang AN. Hyperglycemia accelerates ATP-binding cassette transporter A1 degradation via an ERK-dependent pathway in macrophages. J Cell Biochem 2013; 114:1364-73. [DOI: 10.1002/jcb.24478] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Accepted: 12/05/2012] [Indexed: 11/11/2022]
|
16
|
Placental ABC transporters, cellular toxicity and stress in pregnancy. Chem Biol Interact 2013; 203:456-66. [PMID: 23524238 DOI: 10.1016/j.cbi.2013.03.007] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/05/2013] [Accepted: 03/11/2013] [Indexed: 12/25/2022]
Abstract
The human placenta, in addition to its roles as a nutrient transfer and endocrine organ, functions as a selective barrier to protect the fetus against the harmful effects of exogenous and endogenous toxins. Members of the ATP-binding cassette (ABC) family of transport proteins limit the entry of xenobiotics into the fetal circulation via vectorial efflux from the placenta to the maternal circulation. Several members of the ABC family, including proteins from the ABCA, ABCB, ABCC and ABCG subfamilies, have been shown to be functional in the placenta with clinically significant roles in xenobiotic efflux. However, recent findings suggest that these transporters also protect placental tissue by preventing the cellular accumulation of cytotoxic compounds such as lipids, sterols and their derivatives. Such protective functions are likely to be particularly important in pregnancies complicated by inflammatory or oxidative stress, where the generation of toxic metabolites is enhanced. For example, ABC transporters have been shown to protect against the harmful effects of hypoxia and oxidative stress through increased expression and efflux of oxysterols and glutathione conjugated xenobiotics. However, this protective capacity may be diminished in response to the same stressors. Several studies in primary human trophoblast cells and animal models have demonstrated decreased expression and activity of placental ABC transporters with inflammatory, oxidative or metabolic stress. Several clinical studies in pregnancies complicated by inflammatory conditions such as preeclampsia and gestational diabetes support these findings, although further studies are required to determine the clinical relevance of the relationships between placental ABC transporter expression and activity, and placental function in stressed pregnancies. Such studies are necessary to fully understand the consequences of pregnancy disorders on placental function and viability in order to optimise pregnancy care and maximise fetal growth and health.
Collapse
|
17
|
Andersen CJ, Blesso CN, Lee J, Barona J, Shah D, Thomas MJ, Fernandez ML. Egg consumption modulates HDL lipid composition and increases the cholesterol-accepting capacity of serum in metabolic syndrome. Lipids 2013; 48:557-67. [PMID: 23494579 DOI: 10.1007/s11745-013-3780-8] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 02/21/2013] [Indexed: 02/02/2023]
Abstract
We recently demonstrated that daily whole egg consumption during moderate carbohydrate restriction leads to greater increases in plasma HDL-cholesterol (HDL-C) and improvements in HDL profiles in metabolic syndrome (MetS) when compared to intake of a yolk-free egg substitute. We further investigated the effects of this intervention on HDL composition and function, hypothesizing that the phospholipid species present in egg yolk modulate HDL lipid composition to increase the cholesterol-accepting capacity of subject serum. Men and women classified with MetS were randomly assigned to consume either three whole eggs (EGG, n = 20) per day or the equivalent amount of egg substitute (SUB, n = 17) throughout a 12-week moderate carbohydrate-restricted (25-30 % of energy) diet. Relative to other HDL lipids, HDL-cholesteryl ester content increased in all subjects, with greater increases in the SUB group. Further, HDL-triacylglycerol content was reduced in EGG group subjects with normal baseline plasma HDL-C, resulting in increases in HDL-CE/TAG ratios in both groups. Phospholipid analysis by mass spectrometry revealed that HDL became enriched in phosphatidylethanolamine in the EGG group, and that EGG group HDL better reflected sphingomyelin species present in the whole egg product at week 12 compared to baseline. Further, macrophage cholesterol efflux to EGG subject serum increased from baseline to week 12, whereas no changes were observed in the SUB group. Together, these findings suggest that daily egg consumption promotes favorable shifts in HDL lipid composition and function beyond increasing plasma HDL-C in MetS.
Collapse
Affiliation(s)
- Catherine J Andersen
- Department of Nutritional Sciences, University of Connecticut, 3624 Horsebarn Road Ext., Unit 4017, Storrs, CT 06269-4017, USA
| | | | | | | | | | | | | |
Collapse
|
18
|
Kurosaki Y, Tsukushi T, Munekata S, Akahoshi T, Moriya T, Ogawa Z. Semiquantitative analysis of apolipoprotein A-I modified by advanced glycation end products in diabetes mellitus. J Clin Lab Anal 2013; 27:231-6. [PMID: 23440769 DOI: 10.1002/jcla.21591] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 01/15/2013] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Apolipoprotein A-I (Apo A-I), the major component of high-density lipoprotein (HDL), is modified by reactive α-oxoaldehydes, such as methylglyoxal (MG) and glycolaldehyde (GA), and these modifications affect the function of Apo A-I. GA- and MG-modified Apo A-I serum levels were semiquantitatively evaluated in diabetic patients to elucidate the association of each protein with diabetes and to determine its appropriateness as a serum marker of diabetes. METHODS We enrolled 44 subjects in this study (diabetic subjects, n = 24; nondiabetic subjects, n = 20). GA- and MG-modified Apo A-I levels in serum were determined by sandwich enzyme-linked immunosorbent assay (ELISA) by using anti-GA or anti-MG antibody and anti-Apo A-I antibody. RESULTS The GA-modified Apo A-I levels did not significantly differ between the diabetic and nondiabetic subjects (1.00 ± 0.38 vs. 0.96 ± 0.22). However, the MG-modified Apo A-I levels in the diabetic subjects were significantly higher than those in the nondiabetic subjects (1.33 ± 0.52 vs. 0.90 ± 0.20). In addition, MG-modified Apo A-I levels correlated with the glycated hemoglobin (HbA1c) levels, HDL-cholesterol levels, and the homeostasis model assessments of insulin resistance, which are indicators of insulin resistance. CONCLUSION The MG-modified Apo A-I level may be an indicator of diabetic dyslipidemia and insulin resistance.
Collapse
Affiliation(s)
- Yoshifumi Kurosaki
- Department of Molecular Medical Biology, Graduate school of Medical Sciences, Kitasato University, Sagamihara, Japan.
| | | | | | | | | | | |
Collapse
|
19
|
Kaplan M, Aviram M, Hayek T. Oxidative stress and macrophage foam cell formation during diabetes mellitus‐induced atherogenesis: Role of insulin therapy. Pharmacol Ther 2012; 136:175-85. [DOI: 10.1016/j.pharmthera.2012.08.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Accepted: 07/10/2012] [Indexed: 01/04/2023]
|
20
|
Research Advances of Cholesterol Efflux in Atherosclerosis*. PROG BIOCHEM BIOPHYS 2012. [DOI: 10.3724/sp.j.1206.2011.00301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
21
|
A dual enzymatic-biosensor for simultaneous determination of glucose and cholesterol in serum and peritoneal macrophages of diabetic mice: Evaluation of the diabetes-accelerated atherosclerosis risk. Anal Chim Acta 2011; 707:135-41. [DOI: 10.1016/j.aca.2011.09.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 09/07/2011] [Accepted: 09/08/2011] [Indexed: 11/19/2022]
|
22
|
Albrecht C, Nikitina L, Wenger F, Baumann M, Surbek D, Körner M. ABCA1 and placental cholesterol efflux: A reply. Placenta 2011; 32:710-711. [PMID: 30011749 DOI: 10.1016/j.placenta.2011.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Accepted: 06/10/2011] [Indexed: 10/18/2022]
Affiliation(s)
- C Albrecht
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bühlstr. 28, CH-3012 Bern, Switzerland.
| | - L Nikitina
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bühlstr. 28, CH-3012 Bern, Switzerland
| | - F Wenger
- Institute of Biochemistry and Molecular Medicine, University of Bern, Bühlstr. 28, CH-3012 Bern, Switzerland
| | - M Baumann
- Department of Obstetrics and Gynecology, University Hospital, University of Bern, Bern, Switzerland
| | - D Surbek
- Department of Obstetrics and Gynecology, University Hospital, University of Bern, Bern, Switzerland
| | - M Körner
- Institute of Pathology, University of Bern, Bern, Switzerland
| |
Collapse
|
23
|
Zhang Q, Zhang Y, Feng H, Guo R, Jin L, Wan R, Wang L, Chen C, Li S. High density lipoprotein (HDL) promotes glucose uptake in adipocytes and glycogen synthesis in muscle cells. PLoS One 2011; 6:e23556. [PMID: 21886796 PMCID: PMC3158770 DOI: 10.1371/journal.pone.0023556] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Accepted: 07/20/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND High density lipoprotein (HDL) was reported to decrease plasma glucose and promote insulin secretion in type 2 diabetes patients. This investigation was designed to determine the effects and mechanisms of HDL on glucose uptake in adipocytes and glycogen synthesis in muscle cells. METHODS AND RESULTS Actions of HDL on glucose uptake and GLUT4 translocation were assessed with 1-[(3)H]-2-deoxyglucose and plasma membrane lawn, respectively, in 3T3-L1 adipocytes. Glycogen analysis was performed with amyloglucosidase and glucose oxidase-peroxidase methods in normal and palmitate-treated L6 cells. Small interfering RNA was used to observe role of scavenger receptor type I (SR-BI) in glucose uptake of HDL. Corresponding signaling molecules were detected by immunoblotting. HDL stimulated glucose uptake in a time- and concentration-dependent manner in 3T3-L1 adipocytes. GLUT4 translocation was significantly increased by HDL. Glycogen deposition got enhanced in L6 muscle cells paralleling with elevated glycogen synthase kinase3 (GSK3) phosphorylation. Meanwhile, increased phosphorylations of Akt-Ser473 and AMP activated protein kinase (AMPK) α were detected in 3T3-L1 adipocytes. Glucose uptake and Akt-Ser473 activation but not AMPK-α were diminished in SR-BI knock-down 3T3-L1 cells. CONCLUSIONS HDL stimulates glucose uptake in 3T3-L1 adipocytes through enhancing GLUT4 translocation by mechanisms involving PI3K/Akt via SR-BI and AMPK signaling pathways, and increases glycogen deposition in L6 muscle cells through promoting GSK3 phosphorylation.
Collapse
Affiliation(s)
- Qichun Zhang
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, People's Republic of China
| | - Yun Zhang
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Haihua Feng
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Rui Guo
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Lai Jin
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Rong Wan
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Lina Wang
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Cheng Chen
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
| | - Shengnan Li
- Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing, People's Republic of China
- * E-mail:
| |
Collapse
|
24
|
Keelan JA, Aye ILMH, Mark PJ, Waddell BJ. ABCA1 and placental cholesterol efflux. Placenta 2011; 32:708-709. [PMID: 21704370 DOI: 10.1016/j.placenta.2011.06.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 06/08/2011] [Indexed: 11/18/2022]
Affiliation(s)
- J A Keelan
- School of Women's and Infants' Health, University of Western Australia, King Edward Memorial Hospital, 374 Bagot Rd, Subiaco, Perth WA 6008, Australia.
| | - I L M H Aye
- School of Women's and Infants' Health, University of Western Australia, Australia
| | - P J Mark
- School of Anatomy and Human Biology, University of Western Australia, Australia
| | - B J Waddell
- School of Anatomy and Human Biology, University of Western Australia, Australia
| |
Collapse
|
25
|
McLaren JE, Michael DR, Ashlin TG, Ramji DP. Cytokines, macrophage lipid metabolism and foam cells: implications for cardiovascular disease therapy. Prog Lipid Res 2011; 50:331-47. [PMID: 21601592 DOI: 10.1016/j.plipres.2011.04.002] [Citation(s) in RCA: 257] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 04/14/2011] [Accepted: 04/14/2011] [Indexed: 12/23/2022]
Abstract
Cardiovascular disease is the biggest killer globally and the principal contributing factor to the pathology is atherosclerosis; a chronic, inflammatory disorder characterized by lipid and cholesterol accumulation and the development of fibrotic plaques within the walls of large and medium arteries. Macrophages are fundamental to the immune response directed to the site of inflammation and their normal, protective function is harnessed, detrimentally, in atherosclerosis. Macrophages contribute to plaque development by internalizing native and modified lipoproteins to convert them into cholesterol-rich foam cells. Foam cells not only help to bridge the innate and adaptive immune response to atherosclerosis but also accumulate to create fatty streaks, which help shape the architecture of advanced plaques. Foam cell formation involves the disruption of normal macrophage cholesterol metabolism, which is governed by a homeostatic mechanism that controls the uptake, intracellular metabolism, and efflux of cholesterol. It has emerged over the last 20 years that an array of cytokines, including interferon-γ, transforming growth factor-β1, interleukin-1β, and interleukin-10, are able to manipulate these processes. Foam cell targeting, anti-inflammatory therapies, such as agonists of nuclear receptors and statins, are known to regulate the actions of pro- and anti-atherogenic cytokines indirectly of their primary pharmacological function. A clear understanding of macrophage foam cell biology will hopefully enable novel foam cell targeting therapies to be developed for use in the clinical intervention of atherosclerosis.
Collapse
Affiliation(s)
- James E McLaren
- Cardiff School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK
| | | | | | | |
Collapse
|