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Yang Y, Konrad RJ, Ploug M, Young SG. APOA5 deficiency causes hypertriglyceridemia by reducing amounts of lipoprotein lipase in capillaries. J Lipid Res 2024; 65:100578. [PMID: 38880127 PMCID: PMC11299584 DOI: 10.1016/j.jlr.2024.100578] [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: 05/29/2024] [Revised: 06/11/2024] [Accepted: 06/12/2024] [Indexed: 06/18/2024] Open
Abstract
Apolipoprotein AV (APOA5) deficiency causes hypertriglyceridemia in mice and humans. For years, the cause remained a mystery, but the mechanisms have now come into focus. Here, we review progress in defining APOA5's function in plasma triglyceride metabolism. Biochemical studies revealed that APOA5 binds to the angiopoietin-like protein 3/8 complex (ANGPTL3/8) and suppresses its ability to inhibit the activity of lipoprotein lipase (LPL). Thus, APOA5 deficiency is accompanied by increased ANGPTL3/8 activity and lower levels of LPL activity. APOA5 deficiency also reduces amounts of LPL in capillaries of oxidative tissues (e.g., heart, brown adipose tissue). Cell culture experiments revealed the likely explanation: ANGPTL3/8 detaches LPL from its binding sites on the surface of cells, and that effect is blocked by APOA5. Both the low intracapillary LPL levels and the high plasma triglyceride levels in Apoa5-/- mice are normalized by recombinant APOA5. Carboxyl-terminal sequences in APOA5 are crucial for its function; a mutant APOA5 lacking 40-carboxyl-terminal residues cannot bind to ANGPTL3/8 and lacks the ability to change intracapillary LPL levels or plasma triglyceride levels in Apoa5-/- mice. Also, an antibody against the last 26 amino acids of APOA5 reduces intracapillary LPL levels and increases plasma triglyceride levels in wild-type mice. An inhibitory ANGPTL3/8-specific antibody functions as an APOA5-mimetic reagent, increasing intracapillary LPL levels and lowering plasma triglyceride levels in both Apoa5-/- and wild-type mice. That antibody is a potentially attractive strategy for treating elevated plasma lipid levels in human patients.
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Affiliation(s)
- Ye Yang
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA; Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Robert J Konrad
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN, USA
| | - Michael Ploug
- Finsen Laboratory, Copenhagen University Hospital-Rigshospitalet, Copenhagen N, Denmark; Finsen Laboratory, Biotech Research and Innovation Centre, University of Copenhagen, Copenhagen N, Denmark
| | - Stephen G Young
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA; Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
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Yang Y, Beigneux AP, Song W, Nguyen LP, Jung H, Tu Y, Weston TA, Tran CM, Xie K, Yu RG, Tran AP, Miyashita K, Nakajima K, Murakami M, Chen YQ, Zhen EY, Kim JR, Kim PH, Birrane G, Tontonoz P, Ploug M, Konrad RJ, Fong LG, Young SG. Hypertriglyceridemia in Apoa5-/- mice results from reduced amounts of lipoprotein lipase in the capillary lumen. J Clin Invest 2023; 133:e172600. [PMID: 37824203 PMCID: PMC10688983 DOI: 10.1172/jci172600] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 10/05/2023] [Indexed: 10/14/2023] Open
Abstract
Why apolipoprotein AV (APOA5) deficiency causes hypertriglyceridemia has remained unclear, but we have suspected that the underlying cause is reduced amounts of lipoprotein lipase (LPL) in capillaries. By routine immunohistochemistry, we observed reduced LPL staining of heart and brown adipose tissue (BAT) capillaries in Apoa5-/- mice. Also, after an intravenous injection of LPL-, CD31-, and GPIHBP1-specific mAbs, the binding of LPL Abs to heart and BAT capillaries (relative to CD31 or GPIHBP1 Abs) was reduced in Apoa5-/- mice. LPL levels in the postheparin plasma were also lower in Apoa5-/- mice. We suspected that a recent biochemical observation - that APOA5 binds to the ANGPTL3/8 complex and suppresses its capacity to inhibit LPL catalytic activity - could be related to the low intracapillary LPL levels in Apoa5-/- mice. We showed that an ANGPTL3/8-specific mAb (IBA490) and APOA5 normalized plasma triglyceride (TG) levels and intracapillary LPL levels in Apoa5-/- mice. We also showed that ANGPTL3/8 detached LPL from heparan sulfate proteoglycans and GPIHBP1 on the surface of cells and that the LPL detachment was blocked by IBA490 and APOA5. Our studies explain the hypertriglyceridemia in Apoa5-/- mice and further illuminate the molecular mechanisms that regulate plasma TG metabolism.
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Affiliation(s)
- Ye Yang
- Department of Medicine and
- Human Genetics, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
| | | | | | | | | | | | | | | | | | | | | | - Kazuya Miyashita
- Department of Clinical Laboratory Medicine, Gunma University, Graduate School of Medicine, Maebashi, Gunma, Japan
| | - Katsuyuki Nakajima
- Department of Clinical Laboratory Medicine, Gunma University, Graduate School of Medicine, Maebashi, Gunma, Japan
| | - Masami Murakami
- Department of Clinical Laboratory Medicine, Gunma University, Graduate School of Medicine, Maebashi, Gunma, Japan
| | - Yan Q. Chen
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana, USA
| | - Eugene Y. Zhen
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana, USA
| | | | | | - Gabriel Birrane
- Division of Experimental Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Peter Tontonoz
- Department of Pathology and Laboratory Medicine, UCLA, Los Angeles, California, USA
| | - Michael Ploug
- Finsen Laboratory, Copenhagen University Hospital–Rigshospitalet, Copenhagen, Denmark
- Biotech Research and Innovation Centre (BRIC), University of Copenhagen, Copenhagen, Denmark
| | - Robert J. Konrad
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana, USA
| | | | - Stephen G. Young
- Department of Medicine and
- Human Genetics, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
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Association of Serum Apolipoprotein A5 Concentration with Nonalcoholic Fatty Liver Disease in Ningbo, China. CONTRAST MEDIA & MOLECULAR IMAGING 2022; 2022:7015528. [PMID: 35854768 PMCID: PMC9286930 DOI: 10.1155/2022/7015528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 05/31/2022] [Accepted: 06/01/2022] [Indexed: 11/29/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a common chronic disease characterized by the excessive accumulation of hepatocyte fat and steatosis in the absence of alcohol or any other clear contributing factors to liver injury. NAFLD has been confirmed to be closely associated with obesity, insulin resistance, and dyslipidemia. Genetic polymorphism studies have shown the relations between the apolipoprotein A5 gene (APOA5) and NAFLD. However, the association between the serum ApoA5 level and NAFLD remains unclear. Between September 2018 and August 2019, adults who attended the hospital-based health checkup center were enrolled in this study. Anthropometric examination, laboratory investigations on fasting blood, and abdominal ultrasonography were performed. The serum ApoA5 level was determined by enzyme-linked immunosorbent assay. A total of 517 eligible participants (317 females and 200 males) were involved in this study, with a mean age of 54.7 ± 16.7 years. The mean ApoA5 concentration was 28.8 ± 4.7 μg/ml, among which the males had higher concentration levels than females (29.3 ± 4.5 vs. 28.5 ± 4.7 μg/mL, P=0.04). Serum ApoA5 level was not significantly correlated with NAFLD or metabolic profiles. However, the prevalence rate of hypertriglyceridemia (triglyceride ≥ 1.7 mmol/L) showed a significant inverted “U”-shaped trend in individuals with the serum ApoA5 level of quartile one to quartile four after adjusting the confounding factors. Moreover, individuals with higher serum ApoA5 levels were also more likely to suffer from hyperglycemia. The ApoA5 levels and the prevalence of hypertriglyceridemia are in an inverted “U-shaped” correlation, but there is no significant difference between ApoA5 levels, NAFLD, and metabolic syndrome.
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Reza AHMM, Zhou Y, Qin J, Tang Y. Aggregation-induced emission luminogens for lipid droplet imaging. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2021; 184:101-144. [PMID: 34749970 DOI: 10.1016/bs.pmbts.2021.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Lipid droplets (LDs) are evolutionarily conserved organelles involved in energy homeostasis and versatile intracellular processes in different cell types. Their importance is ubiquitous, ranges from utilization as the biofunctional components to third-generation biofuel production from microalgae, while morphology and functional perturbations could also relate to the multiple diseases in higher mammals. Biosynthesis of lipids can be triggered by multiple factors related to organismal physiology and the surrounding environment. An early prediction of this might help take necessary actions toward desired outcomes. In vivo visualization of LDs can give molecular insight into regulatory mechanisms and the underlying connections with other cellular structures. Traditional bioprobes for LDs detection often suffer from different dye-specific limitations such as aggregation-caused quenching and self-decomposition phenomena that hinder the research advancement. The emergence of lipid-specific nanoprobes with aggregation-induced emission (AIE) attributes in recent years is promising in remunerative characteristics with defined bioimaging properties. By utilizing the easy synthetic techniques and exploiting the unique physical features of these molecules, highly selective, stable, biocompatible and facile fluorescent probes could be fabricated for lipid detection. This chapter will provide up-to-date insight into the recent advances in lipid-specific AIE-based probes to enhance the opportunities for basic research related to the distinct roles of LDs in living organisms.
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Affiliation(s)
- A H M Mohsinul Reza
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia; Institute for NanoScale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, SA, Australia
| | - Yabin Zhou
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia
| | - Jianguang Qin
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia.
| | - Youhong Tang
- College of Science and Engineering, Flinders University, Adelaide, SA, Australia; Institute for NanoScale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, SA, Australia.
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Reza AM, Tavakoli J, Zhou Y, Qin J, Tang Y. Synthetic fluorescent probes to apprehend calcium signalling in lipid droplet accumulation in microalgae—an updated review. Sci China Chem 2020. [DOI: 10.1007/s11426-019-9664-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Castleberry M, Davis X, Liu M, Thompson TB, Tso P, Davidson WS. Functional recombinant apolipoprotein A5 that is stable at high concentrations at physiological pH. J Lipid Res 2020; 61:244-251. [PMID: 31831525 PMCID: PMC6997596 DOI: 10.1194/jlr.d119000103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 11/25/2019] [Indexed: 11/20/2022] Open
Abstract
APOA5 is a low-abundance exchangeable apolipoprotein that plays critical roles in human triglyceride (TG) metabolism. Indeed, aberrations in the plasma concentration or structure of APOA5 are linked to hypertriglyceridemia, hyperchylomicronemia, myocardial infarction risk, obesity, and coronary artery disease. While it has been successfully produced at low yield in bacteria, the resulting protein had limitations for structure-function studies due to its low solubility under physiological buffer conditions. We hypothesized that the yield and solubility of recombinant APOA5 could be increased by: i) engineering a fusion protein construct in a codon optimized expression vector, ii) optimizing an efficient refolding protocol, and iii) screening buffer systems at physiological pH. The result was a high-yield (25 mg/l) bacterial expression system that produces lipid-free APOA5 soluble at concentrations of up to 10 mg/ml at a pH of 7.8 in bicarbonate buffers. Physical characterization of lipid-free APOA5 indicated that it exists as an array of multimers in solution, and far UV circular dichroism analyses show differences in total α-helicity between acidic and neutral pH buffering conditions. The protein was functional in that it bound and emulsified multilamellar dimyristoyl-phosphatidylcholine vesicles and could inhibit postprandial plasma TG accumulation when injected into C57BL/6J mice orally gavaged with Intralipid.
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Affiliation(s)
- Mark Castleberry
- Departments of Molecular Genetics, Biochemistry, and Microbiology University of Cincinnati College of Medicine, Cincinnati, OH
| | - Xenia Davis
- Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, OH
| | - Min Liu
- Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, OH
| | - Thomas B Thompson
- Departments of Molecular Genetics, Biochemistry, and Microbiology University of Cincinnati College of Medicine, Cincinnati, OH
| | - Patrick Tso
- Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, OH
| | - W Sean Davidson
- Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, OH
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Takanashi M, Kimura T, Li C, Tanaka M, Matsuhashi A, Yoshida H, Noda A, Xu P, Takase S, Okazaki S, Iizuka Y, Kumagai H, Ikeda Y, Gotoda T, Takahashi M, Yagyu H, Ishibashi S, Yamauchi T, Kadowaki T, Liang G, Okazaki H. Critical Role of SREBP-1c Large-VLDL Pathway in Environment-Induced Hypertriglyceridemia of Apo AV Deficiency. Arterioscler Thromb Vasc Biol 2020; 39:373-386. [PMID: 30700132 DOI: 10.1161/atvbaha.118.311931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Objective- APOA5 variants are strongly associated with hypertriglyceridemia, as well as increased risks of cardiovascular disease and acute pancreatitis. Hypertriglyceridemia in apo AV dysfunction often aggravates by environmental factors such as high-carbohydrate diets or aging. To date, the molecular mechanisms by which these environmental factors induce hypertriglyceridemia are poorly defined, leaving the high-risk hypertriglyceridemia condition undertreated. Previously, we reported that LXR (liver X receptor)-SREBP (sterol regulatory element-binding protein)-1c pathway regulates large-VLDL (very low-density lipoprotein) production induced by LXR agonist. However, the pathophysiological relevance of the finding remains unknown. Approach and Results- Here, we reconstitute the environment-induced hypertriglyceridemia phenotype of human APOA5 deficiency in Apoa5-/- mice and delineate the role of SREBP-1c in vivo by generating Apoa5-/- ;Srebp-1c-/- mice. The Apoa5-/- mice, which showed moderate hypertriglyceridemia on a chow diet, developed severe hypertriglyceridemia on high-carbohydrate feeding or aging as seen in patients with human apo AV deficiency. These responses were nearly completely abolished in the Apoa5-/- ;Srebp-1c-/- mice. Further mechanistic studies revealed that in response to these environmental factors, SREBP-1c was activated to increase triglyceride synthesis and to permit the incorporation of triglyceride into abnormally large-VLDL particles, which require apo AV for efficient clearance. Conclusions- Severe hypertriglyceridemia develops only when genetic factors (apo AV deficiency) and environmental effects (SREBP-1c activation) coexist. We demonstrate that the regulated production of large-sized VLDL particles via SREBP-1c determines plasma triglyceride levels in apo AV deficiency. Our findings explain the long-standing enigma of the late-onset hypertriglyceridemia phenotype of apo AV deficiency and suggest a new approach to treat hypertriglyceridemia by targeting genes that mediate environmental effects.
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Affiliation(s)
- Mikio Takanashi
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Takeshi Kimura
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Chengcheng Li
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Masaki Tanaka
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Ako Matsuhashi
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Hiroki Yoshida
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Akari Noda
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Pengfei Xu
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Satoru Takase
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Sachiko Okazaki
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Yoko Iizuka
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Hidetoshi Kumagai
- Department of Cardiovascular Medicine (H.K., Y. Ikeda), Graduate School of Medicine, the University of Tokyo, Bunkyo-ku, Japan
| | - Yuichi Ikeda
- Department of Cardiovascular Medicine (H.K., Y. Ikeda), Graduate School of Medicine, the University of Tokyo, Bunkyo-ku, Japan
| | - Takanari Gotoda
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Manabu Takahashi
- Division of Endocrinology and Metabolism, School of Medicine, Jichi Medical University, Shimotsuke, Tochigi, Japan (Manabu Takahashi, S.I.)
| | - Hiroaki Yagyu
- Department of Endocrinology and Metabolism, Mito Medical Center, Tsukuba University Hospital, Mito, Ibaraki, Japan (H. Yagyu)
| | - Shun Ishibashi
- Division of Endocrinology and Metabolism, School of Medicine, Jichi Medical University, Shimotsuke, Tochigi, Japan (Manabu Takahashi, S.I.)
| | - Toshimasa Yamauchi
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Takashi Kadowaki
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
| | - Guosheng Liang
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX (G.L., H.O.)
| | - Hiroaki Okazaki
- From the Department of Diabetes and Metabolic Diseases (Mikio Takanashi, T. Kimura, C.L., M. Tanaka, A.M., H. Yoshida, A.N., P.X., S.T., S.O., Y. Iizuka, T.G., T.Y., T. Kadowaki, H.O.)
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX (G.L., H.O.)
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Liu JQ, Li WX, Zheng JJ, Tian QN, Huang JF, Dai SX. Gain and loss events in the evolution of the apolipoprotein family in vertebrata. BMC Evol Biol 2019; 19:209. [PMID: 31722659 PMCID: PMC6854765 DOI: 10.1186/s12862-019-1519-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 09/26/2019] [Indexed: 01/06/2023] Open
Abstract
Background Various apolipoproteins widely distributed among vertebrata play key roles in lipid metabolism and have a direct correlation with human diseases as diagnostic markers. However, the evolutionary progress of apolipoproteins in species remains unclear. Nine human apolipoproteins and well-annotated genome data of 30 species were used to identify 210 apolipoprotein family members distributed among species from fish to humans. Our study focused on the evolution of nine exchangeable apolipoproteins (ApoA-I/II/IV/V, ApoC-I~IV and ApoE) from Chondrichthyes, Holostei, Teleostei, Amphibia, Sauria (including Aves), Prototheria, Marsupialia and Eutheria. Results In this study, we reported the overall distribution and the frequent gain and loss evolutionary events of apolipoprotein family members in vertebrata. Phylogenetic trees of orthologous apolipoproteins indicated evident divergence between species evolution and apolipoprotein phylogeny. Successive gain and loss events were found by evaluating the presence and absence of apolipoproteins in the context of species evolution. For example, only ApoA-I and ApoA-IV occurred in cartilaginous fish as ancient apolipoproteins. ApoA-II, ApoE, and ApoC-I/ApoC-II were found in Holostei, Coelacanthiformes, and Teleostei, respectively, but the latter three apolipoproteins were absent from Aves. ApoC-I was also absent from Cetartiodactyla. The apolipoprotein ApoC-III emerged in terrestrial animals, and ApoC-IV first arose in Eutheria. The results indicate that the order of the emergence of apolipoproteins is most likely ApoA-I/ApoA-IV, ApoE, ApoA-II, ApoC-I/ApoC-II, ApoA-V, ApoC-III, and ApoC-IV. Conclusions This study reveals not only the phylogeny of apolipoprotein family members in species from Chondrichthyes to Eutheria but also the occurrence and origin of new apolipoproteins. The broad perspective of gain and loss events and the evolutionary scenario of apolipoproteins across vertebrata provide a significant reference for the research of apolipoprotein function and related diseases.
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Affiliation(s)
- Jia-Qian Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Wen-Xing Li
- Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.,Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, 650204, China
| | - Jun-Juan Zheng
- Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.,Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, 650204, China
| | - Qing-Nan Tian
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, China.
| | - Jing-Fei Huang
- Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | - Shao-Xing Dai
- Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
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High density lipoprotein promotes nascent apolipoprotein A-V secretion from mRNA transfected cells. Biochem Biophys Res Commun 2019; 512:387-391. [PMID: 30902391 DOI: 10.1016/j.bbrc.2019.03.087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 03/15/2019] [Indexed: 01/09/2023]
Abstract
Despite its exceptionally low circulating concentration, apolipoprotein (apo) A-V is a potent modulator of plasma triacylglycerol levels. The secretion efficiency of nascent apoA-V was investigated in cultured cells transfected with mRNA. Following transfection of HepG2 cells with wild type apoA-V mRNA, apoA-V protein was detectable in cell lysates by 6 h. At 24 h post transfection, evidence of apoA-V secretion into media was obtained, although most apoA-V was recovered in the cell lysate fraction. By contrast, apoA-I was efficiently secreted into the culture medium. A positive correlation between culture medium fetal bovine serum content and the percentage of apoA-V recovered in conditioned media was observed. When transfected cells were cultured in serum-free media supplemented with increasing amounts of high density lipoprotein, a positive correlation with apoA-V secretion was observed. The data indicate that, following signal sequence cleavage, the bulk of nascent apoA-V remains cell associated. Transit of nascent apoA-V out of cultured cells is enhanced by the availability of extracellular lipid particle acceptors.
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Association of apolipoprotein A-V with mRNA expression of IL-6 and NF-κB genes in type 2 diabetes with hypertriglyceridemia: a possible link with inflammation. Int J Diabetes Dev Ctries 2019. [DOI: 10.1007/s13410-018-0709-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Zemánková K, Dembovská R, Piťha J, Kovář J. Glucose added to a fat load suppresses the postprandial triglyceridemia response in carriers of the -1131C and 56G variants of the APOA5 gene. Physiol Res 2017; 66:859-866. [PMID: 28730827 DOI: 10.33549/physiolres.933552] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Apolipoprotein A-V plays an important role in the determination of plasma triglyceride (TG) concentration. We aimed to determine whether polymorphisms -1131T>C (rs662799) and 56C>G (rs3135506) of the APOA5 gene have an impact on the course of postprandial lipemia induced by a fat load and a fat load with added glucose. Thirty healthy male volunteers, seven heterozygous for the -1131C variant and three for the 56G variant (HT) carriers, and 20 wild-type (WT) carriers underwent two 8-hour tests of postprandial lipemia - one after an experimental breakfast consisting of 75 g of fat and second after a breakfast consisting of 75 g of fat and 25 g of glucose. HT carriers had a higher postprandial response after fat load than WT carriers (AUC TG: 14.01+/-4.27 vs. 9.84+/-3.32 mmol*h/l, respectively, p=0.016). Glucose added to the test meal suppressed such a difference. Heterozygous carriers of the variants of APOA5 (-1131C and 56G) display more pronounced postprandial lipemia after pure fat load than WT carriers. This statistically significant difference disappears when glucose is added to a fat load, suggesting that meal composition modulates the effect of these polymorphisms on the magnitude of postprandial lipemia.
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Affiliation(s)
- K Zemánková
- Laboratory for Atherosclerosis Research, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
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Severe hypertriglyceridemia in Japan: Differences in causes and therapeutic responses. J Clin Lipidol 2017; 11:1383-1392. [PMID: 28958672 DOI: 10.1016/j.jacl.2017.08.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 07/27/2017] [Accepted: 08/10/2017] [Indexed: 01/01/2023]
Abstract
BACKGROUND Severe hypertriglyceridemia (>1000 mg/dL) has a variety of causes and frequently leads to life-threating acute pancreatitis. However, the origins of this disorder are unclear for many patients. OBJECTIVE We aimed to characterize the causes of and responses to therapy in rare cases of severe hypertriglyceridemia in a group of Japanese patients. METHODS We enrolled 121 patients from a series of case studies that spanned 30 years. Subjects were divided into 3 groups: (1) primary (genetic causes); (2) secondary (acquired); and (3) disorders of uncertain causes. In the last group, we focused on 3 possible risks factors for hypertriglyceridemia: obesity, diabetes mellitus, and heavy alcohol intake. RESULTS Group A (n = 20) included 13 patients with familial lipoprotein lipase deficiency, 3 patients with apolipoprotein CII deficiency, and other genetic disorders in the rest of the group. Group B patients (n = 15) had various metabolic and endocrine diseases. In Group C (uncertain causes; n = 86), there was conspicuous gender imbalance (79 males, 3 females) and most male subjects were heavy alcohol drinkers. In addition, 18 of 105 adult patients (17%) had histories of acute pancreatitis. CONCLUSION The cause of severe hypertriglyceridemia is uncertain in many patients. In primary genetic forms of severe hypertriglyceridemia, genetic diversity between populations is unknown. In the acquired forms, we found fewer cases of estrogen-induced hypertriglyceridemia than in Western countries. In our clinical experience, the cause of most hypertriglyceridemia is uncertain. Our work suggests that genetic factors for plasma triglyceride sensitivity to alcohol should be explored.
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Luo F, Guo Y, Ruan GY, Peng R, Li XP. Estrogen lowers triglyceride via regulating hepatic APOA5 expression. Lipids Health Dis 2017; 16:72. [PMID: 28376804 PMCID: PMC5381129 DOI: 10.1186/s12944-017-0463-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Accepted: 03/28/2017] [Indexed: 12/21/2022] Open
Abstract
Estrogen had been found to be negatively associated with serum triglyceride (TG) levels. Apolipoprotein A5 (APOA5), a novel member of apolipoprotein family, was reported to have a strong ability to decrease serum concentrations of TG. Clinical data found concentrations of APOA5 were higher in woman than that in men, and the negative relationship between APOA5 and TG levels was more significant in woman. These suggests APOA5 may involve in estrogen actions. Therefore, we hypothesize estrogen up-regulates serum concentrations of APOA5 and subsequently decreases serum TG levels. We will design the following experiments to test this hypothesis. (1) We will treat wild and APOA5-defeted ovariectomized hamster with or without estrogen to examine if estrogen could up-regulate concentrations of APOA5 and decrease TG levels. (2) We will treat HepG2 cells with estrogen and investigate the possible mechanisms.
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Affiliation(s)
- Fei Luo
- Department of Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan, 410011, People's Republic of China
| | - Yuan Guo
- Department of Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan, 410011, People's Republic of China
| | - Gui-Yun Ruan
- Department of Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan, 410011, People's Republic of China
| | - Ran Peng
- Department of Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan, 410011, People's Republic of China
| | - Xiang-Ping Li
- Department of Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, Hunan, 410011, People's Republic of China.
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Sharma D, Garg S, Mehndiratta M, V Madhu S, Puri D. Relationship of Serum Apolipoprotein A-V Levels, Oxidative Stress and Inflammatory Biomarkers with Hypertriglyceridemia in Type 2 Diabetes Mellitus. Int J Endocrinol Metab 2017; 15:e44805. [PMID: 28848612 PMCID: PMC5556325 DOI: 10.5812/ijem.44805] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/28/2017] [Accepted: 04/08/2017] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND Serum levels of triglycerides (TGs) are often found to be raised in type 2 diabetes mellitus (T2DM). TG levels ≥ 2.2 mM, systemic inflammation and oxidative stress (OS) are known to increase the risk of incident cardiovascular disease (CVD) substantially. In recent years, apolipoprotein A-V (Apo A-V protein) has attracted considerably as a modulator of circulating TG levels. OBJECTIVES The study was conducted in order to evaluate the levels of Apo A - V proteins and markers of inflammation and OS in patients of T2DM with and without hypertriglyceridemia (HTG) and also to assess correlation between them. METHODS T2DM patients were categorized into two groups of 40 participants, according to criteria for risk of CVD: group 1/ controls (TG ≤ 1.65 mM, n = 40) and group 2/ cases (TG ≥ 2.2 mM, n = 40). Despite the routine investigations, serum levels of Apo A-V, interleukin-6 (IL-6) and Insulin were estimated using ELISA, free fatty acids (FFA) with fluorometric assay and malondialdehyde (MDA) was measured using a spectrophotometer. Comparison of levels and correlation between variables was carried out with appropriate statistical tools. RESULTS Serum Apo A-V protein levels were found significantly lower (P = 0.04) and MDA was significantly higher (P = 0.049) in cases. MDA correlated with TG levels positively (P = 0.000) and negatively with high density lipoproteins (HDL) (P = 0.000). However Apo A-V protein levels did not correlate with TG levels (P = 0.819, r = -0.027), IL-6 (r = 0.135, P = 0.269), FFA (r = 0.128, P = 0.277) and MDA (r = -0.217, P = 0.073). IL-6 levels significantly and positively correlated with HOMA-IR (r = 0.327, P = 0.004) in the all patients. CONCLUSIONS In patients of T2DM, low levels of Apo A-V are associated with HTG, indicating that Apo A-V is linked with TG metabolism. Burden of oxidative stress is greater in HTG of T2DM as is evident from MDA levels and its correlation with TG levels. Since oxidative stress is an important patho-physiological basis which increases the risk of CVD in patients of T2DM with HTG. Further studies are required in order to explore the possible role of Apo A-V in TG metabolism in diabetes.
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Affiliation(s)
- Devesh Sharma
- Departement of Biochemistry, University College of Medical Sciences and GTB Hospital, University of Delhi, Delhi, India
| | - Seema Garg
- Departement of Biochemistry, University College of Medical Sciences and GTB Hospital, University of Delhi, Delhi, India
- Corresponding author: Seema Garg, Department of Biochemistry, University College of Medical Sciences, Dilshad Garden, Delhi. Tel: +011-225829745206, E-mail:
| | - Mohit Mehndiratta
- Departement of Biochemistry, University College of Medical Sciences and GTB Hospital, University of Delhi, Delhi, India
| | - S V Madhu
- Department of Medicine, University College of Medical Sciences and GTB Hospital, University of Delhi, Delhi, India
| | - Dinesh Puri
- Departement of Biochemistry, University College of Medical Sciences and GTB Hospital, University of Delhi, Delhi, India
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Sakurai T, Sakurai A, Vaisman BL, Amar MJ, Liu C, Gordon SM, Drake SK, Pryor M, Sampson ML, Yang L, Freeman LA, Remaley AT. Creation of Apolipoprotein C-II (ApoC-II) Mutant Mice and Correction of Their Hypertriglyceridemia with an ApoC-II Mimetic Peptide. J Pharmacol Exp Ther 2015; 356:341-53. [PMID: 26574515 DOI: 10.1124/jpet.115.229740] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 11/11/2015] [Indexed: 12/31/2022] Open
Abstract
Apolipoprotein C-II (apoC-II) is a cofactor for lipoprotein lipase, a plasma enzyme that hydrolyzes triglycerides (TGs). ApoC-II deficiency in humans results in hypertriglyceridemia. We used zinc finger nucleases to create Apoc2 mutant mice to investigate the use of C-II-a, a short apoC-II mimetic peptide, as a therapy for apoC-II deficiency. Mutant mice produced a form of apoC-II with an uncleaved signal peptide that preferentially binds high-density lipoproteins (HDLs) due to a 3-amino acid deletion at the signal peptide cleavage site. Homozygous Apoc2 mutant mice had increased plasma TG (757.5 ± 281.2 mg/dl) and low HDL cholesterol (31.4 ± 14.7 mg/dl) compared with wild-type mice (TG, 55.9 ± 13.3 mg/dl; HDL cholesterol, 55.9 ± 14.3 mg/dl). TGs were found in light (density < 1.063 g/ml) lipoproteins in the size range of very-low-density lipoprotein and chylomicron remnants (40-200 nm). Intravenous injection of C-II-a (0.2, 1, and 5 μmol/kg) reduced plasma TG in a dose-dependent manner, with a maximum decrease of 90% occurring 30 minutes after the high dose. Plasma TG did not return to baseline until 48 hours later. Similar results were found with subcutaneous or intramuscular injections. Plasma half-life of C-II-a is 1.33 ± 0.72 hours, indicating that C-II-a only acutely activates lipolysis, and the sustained TG reduction is due to the relatively slow rate of new TG-rich lipoprotein synthesis. In summary, we describe a novel mouse model of apoC-II deficiency and show that an apoC-II mimetic peptide can reverse the hypertriglyceridemia in these mice, and thus could be a potential new therapy for apoC-II deficiency.
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Affiliation(s)
- Toshihiro Sakurai
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Akiko Sakurai
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Boris L Vaisman
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Marcelo J Amar
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Chengyu Liu
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Scott M Gordon
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Steven K Drake
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Milton Pryor
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Maureen L Sampson
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Ling Yang
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Lita A Freeman
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
| | - Alan T Remaley
- Lipoprotein Metabolism Section, Cardio-Pulmonary Branch, National Heart, Lung, and Blood Institute (T.S., A.S., B.L.V., M.J.A., C.L., S.M.G., M.P., L.A.F., A.T.R.), Transgenic Core Facility, National Heart, Lung, and Blood Institute (C.L.), Department of Laboratory Medicine, Clinical Center (M.L.S., A.T.R.), Critical Care Medicine Department, Clinical Center (S.K.D.), and Laboratory of Obesity and Metabolic Diseases, National Heart, Lung, and Blood Institute (L.Y.), National Institutes of Health, Bethesda, Maryland
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Domínguez-Reyes T, Astudillo-López CC, Salgado-Goytia L, Muñoz-Valle JF, Salgado-Bernabé AB, Guzmán-Guzmán IP, Castro-Alarcón N, Moreno-Godínez ME, Parra-Rojas I. Interaction of dietary fat intake with APOA2, APOA5 and LEPR polymorphisms and its relationship with obesity and dyslipidemia in young subjects. Lipids Health Dis 2015; 14:106. [PMID: 26365669 PMCID: PMC4568066 DOI: 10.1186/s12944-015-0112-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 08/31/2015] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Diet is an important environmental factor that interacts with genes to modulate the likelihood of developing disorders in lipid metabolism and the relationship between diet and genes in the presence of other chronic diseases such as obesity. The objective of this study was to analyze the interaction of a high fat diet with the APOA2 (rs3813627 and rs5082), APOA5 (rs662799 and rs3135506) and LEPR (rs8179183 and rs1137101) polymorphisms and its relationship with obesity and dyslipidemia in young subjects. METHODS The study included 200 young subjects aged 18 to 25 years (100 normal-weight and 100 obese subjects). Dietary fat intake was measured using the frequency food consumption questionnaire. Genotyping of polymorphisms was performed by PCR-RFLP. RESULTS Individuals carrying the APOA5 56 G/G genotype with a high saturated fatty acid consumption (OR = 2.7, p = 0.006) and/or total fat (OR = 2.4, p = 0.018), associated with an increased risk of obesity. We also found that A/G + G/G genotypes of the 668 A/G polymorphism in the LEPR gene with an intake ≥ 12 g/d of saturated fatty acids, have 2.9 times higher risk of obesity (p = 0.002), 3.8 times higher risk of hypercholesterolemia (p = 0.002) and 2.4 times higher risk of hypertriglyceridemia (p = 0.02), than those with an intake <12 g/d of saturated fatty acids. Similarly, LEPR 668 A/G + G/G carriers with a high fat total intake had 3.0 times higher risk of obesity (p = 0.002) and 4.1 times higher risk of hypercholesterolemia (p = 0.001). CONCLUSION Our results suggest that dietary fat intake modifies the effect of APOA5 and LEPR polymorphisms on serum triglycerides, cholesterol levels and obesity in young subjects.
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Affiliation(s)
- Teresa Domínguez-Reyes
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - Constanza C Astudillo-López
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - Lorenzo Salgado-Goytia
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - José F Muñoz-Valle
- Departamento de Biología Molecular y Genómica, Instituto de Investigación en Ciencias Biomédicas, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Jalisco, Mexico.
| | - Aralia B Salgado-Bernabé
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - Iris P Guzmán-Guzmán
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - Natividad Castro-Alarcón
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - Ma E Moreno-Godínez
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
| | - Isela Parra-Rojas
- Unidad Académica de Ciencias Químico Biológicas, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, Mexico.
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Kayama K, Okada T, Fuwa K, Nagano N, Hosono S, Takahashi S, Takahashi S. Apolipoprotein A-V concentration in preterm infants. J Clin Lipidol 2015; 9:647-51. [DOI: 10.1016/j.jacl.2015.06.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 05/30/2015] [Accepted: 06/05/2015] [Indexed: 10/23/2022]
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Zhang LS, Xu M, Yang Q, Ryan RO, Howles P, Tso P. Apolipoprotein A-V deficiency enhances chylomicron production in lymph fistula mice. Am J Physiol Gastrointest Liver Physiol 2015; 308:G634-42. [PMID: 25617349 PMCID: PMC4385892 DOI: 10.1152/ajpgi.00339.2014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 01/16/2015] [Indexed: 01/31/2023]
Abstract
Apolipoprotein A-V (apoA-V), a liver-synthesized apolipoprotein discovered in 2001, strongly modulates fasting plasma triglycerides (TG). Little is reported on the effect of apoA-V on postprandial plasma TG, an independent predictor for atherosclerosis. Overexpressing apoA-V in mice suppresses postprandial TG, but mechanisms focus on increased lipolysis or clearance of remnant particles. Unknown is whether apoA-V suppresses the absorption of dietary lipids by the gut. This study examines how apoA-V deficiency affects the steady-state absorption and lymphatic transport of dietary lipids in chow-fed mice. Using apoA-V knockout (KO, n = 8) and wild-type (WT, n = 8) lymph fistula mice, we analyzed the uptake and lymphatic transport of lipids during a continuous infusion of an emulsion containing [(3)H]triolein and [(14)C]cholesterol. ApoA-V KO mice showed a twofold increase in (3)H (P < 0.001) and a threefold increase in (14)C (P < 0.001) transport into the lymph compared with WT. The increased lymphatic transport was accompanied by a twofold reduction (P < 0.05) in mucosal (3)H, suggesting that apoA-V KO mice more rapidly secreted [(3)H]TG out of the mucosa into the lymph. ApoA-V KO mice also produced chylomicrons more rapidly than WT (P < 0.05), as measured by the transit time of [(14)C]oleic acid from the intestinal lumen to lymph. Interestingly, apoA-V KO mice produced a steadily increasing number of chylomicron particles over time, as measured by lymphatic apoB output. The data suggest that apoA-V suppresses the production of chylomicrons, playing a previously unknown role in lipid metabolism that may contribute to the postprandial hypertriglyceridemia associated with apoA-V deficiency.
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Affiliation(s)
- Linda S. Zhang
- 1Children's Hospital Oakland Research Institute, Oakland, California
| | - Min Xu
- 1Children's Hospital Oakland Research Institute, Oakland, California
| | - Qing Yang
- 1Children's Hospital Oakland Research Institute, Oakland, California
| | - Robert O. Ryan
- 2Department of Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio; and
| | - Philip Howles
- 1Children's Hospital Oakland Research Institute, Oakland, California
| | - Patrick Tso
- 1Children's Hospital Oakland Research Institute, Oakland, California
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Hori M, Ishihara M, Yuasa Y, Makino H, Yanagi K, Tamanaha T, Kishimoto I, Kujiraoka T, Hattori H, Harada-Shiba M. Removal of plasma mature and furin-cleaved proprotein convertase subtilisin/kexin 9 by low-density lipoprotein-apheresis in familial hypercholesterolemia: development and application of a new assay for PCSK9. J Clin Endocrinol Metab 2015; 100:E41-9. [PMID: 25313916 DOI: 10.1210/jc.2014-3066] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
CONTEXT Proprotein convertase subtilisin/kexin 9 (PCSK9) is known to be a good target to decrease LDL cholesterol (LDL-C) and two forms of PCSK9, mature and furin-cleaved PCSK9, circulate in blood. However, it has not been clarified whether and how the levels of each PCSK9 are affected by LDL-apheresis (LDL-A) treatment, a standard therapy in patients with severe forms of familial hypercholesterolemia (FH). OBJECTIVE Our objective was to investigate the differences in LDL-A-induced reduction of mature and furin-cleaved PCSK9 between homozygous and heterozygous FH, and between dextran sulfate (DS) cellulose adsorption and double membrane (DM) columns and to clarify the mechanism of their removal. DESIGN A sandwich ELISA to measure two forms of PCSK9s using monoclonal antibodies was developed. Using the ELISA, PCSK9 levels were quantified before and after LDL-A with DS columns in 7 homozygous and 11 heterozygous FH patients. A crossover study between the two column types was performed. The profiles of PCSK9s were analyzed after fractionation by gel filtration chromatography. Immunoprecipitation of apolipoprotein B (apoB) in FH plasma was performed. RESULTS Both mature and furin-cleaved PCSK9s were significantly decreased by 55-56% in FH homozygotes after a single LDL-A treatment with DS columns, and by 46-48% or 48-56% in FH heterozygotes after treatment with DS or DM columns. The reduction ratios of LDL-C were strongly correlated with that of PCSK9 in both FH homozygotes and heterozygotes. In addition, more than 80% of plasma PCSK9s were in the apoB-deficient fraction and a significant portion of mature PCSK9 was bound to apoB, as shown by immunoprecipitation. CONCLUSIONS Both mature and furin-cleaved PCSK9s were removed by LDL-A in homozygous and heterozygous FH either by binding to apoB or by other mechanisms. The ELISA method to measure both forms of plasma PCSK9 would be useful for investigating physiological or pathological roles of PCSK9.
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Affiliation(s)
- Mika Hori
- Department of Molecular Innovation in Lipidology (M.H., Y.Y., M.H-S.), National Cerebral and Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan; Advanced Medical Technology and Development Division (M.I., T.K., H.H.), BML, Inc., 1361-1 Matoba, Kawagoe, Saitama 350-1101, Japan; Department of Endocrinology and Metabolism (H.M., T.T., I.K.), National Cerebral and Cardiovascular Center, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan; and Department of Cardiology (K.Y.), Kenporen Osaka Central Hospital, Umeda 3-3-30, Kita-ku, Osaka 530-0001, Japan
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Shou W, Wang Y, Xie F, Wang B, Yang L, Wu H, Wang Y, Wang Z, Shi J, Huang W. A functional polymorphism affecting the APOA5 gene expression is causally associated with plasma triglyceride levels conferring coronary atherosclerosis risk in Han Chinese Population. Biochim Biophys Acta Mol Basis Dis 2014; 1842:2147-54. [DOI: 10.1016/j.bbadis.2014.08.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 07/29/2014] [Accepted: 08/13/2014] [Indexed: 01/21/2023]
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Li S, Hu B, Wang Y, Wu D, Jin L, Wang X. Influences of APOA5 variants on plasma triglyceride levels in Uyghur population. PLoS One 2014; 9:e110258. [PMID: 25313938 PMCID: PMC4196964 DOI: 10.1371/journal.pone.0110258] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 09/11/2014] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE Single nucleotide polymorphisms (SNPs) in apolipoprotein A5 (APOA5) gene are associated with triglyceride (TG) levels. However, the minor allele frequencies and linkage disequilibriums (LDs) of the SNPs in addition to their effects on TG levels vary greatly between Caucasians and East Asians. The distributions of the SNPs/haplotypes and their associations with TG levels in Uyghur population, an admixture population of Caucasians and East Asians, have not been reported to date. Here, we performed a cross-sectional study to address these. METHODS Genotyping of four SNPs in APOA5 (rs662799, rs3135506, rs2075291, and rs2266788) was performed in 1174 unrelated Uyghur subjects. SNP/haplotype and TG association analyses were conducted. RESULTS The frequencies of the SNPs in Uyghurs were in between those in Caucasians and East Asians. The LD between rs662799 and rs2266788 in Uyghurs was stronger than that in East Asians but weaker than that in Caucasians, and the four SNPs resulted in four haplotypes (TGGT, CGGC, TCGT, and CGTT arranged in the order of rs662799, rs3135506, rs2075291, and rs2266788) representing 99.2% of the population. All the four SNPs were significantly associated with TG levels. Compared with non-carriers, carriers of rs662799-C, rs3135506-C, rs2075291-T, and rs2266788-C alleles had 16.0%, 15.1%, 17.1%, and 12.4% higher TG levels, respectively. When haplotype TGGT was defined as the reference, the haplotypes CGGC, TCGT, and CGTT resulted in 16.1%, 19.0%, and 19.8% higher TG levels, respectively. The proportions of variance in TG explained by APOA5 locus were 2.5%, 0.3%, 0.4%, and 1.9% for single SNP rs662799, rs3135506, rs2075291, and rs2266788, respectively, and 3.0% for the haplotypes constructed by them. CONCLUSIONS The association profiles between the SNPs and haplotypes at APOA5 locus and TG levels in this admixture population differed from those in Caucasians and East Asians. The functions of these SNPs and haplotypes need to be elucidated comprehensively.
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Affiliation(s)
- Shuyuan Li
- Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai, China; Fudan-Taizhou Institute of Health Sciences, Taizhou, Jiangsu, China
| | - Bin Hu
- Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai, China; Fudan-Taizhou Institute of Health Sciences, Taizhou, Jiangsu, China
| | - Yi Wang
- Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai, China; Fudan-Taizhou Institute of Health Sciences, Taizhou, Jiangsu, China
| | - Di Wu
- Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai, China
| | - Li Jin
- Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai, China; Fudan-Taizhou Institute of Health Sciences, Taizhou, Jiangsu, China
| | - Xiaofeng Wang
- Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai, China; Fudan-Taizhou Institute of Health Sciences, Taizhou, Jiangsu, China
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Sharma V, Witkowski A, Witkowska HE, Dykstra A, Simonsen JB, Nelbach L, Beckstead JA, Pullinger CR, Kane JP, Malloy MJ, Watson G, Forte TM, Ryan RO. Aberrant hetero-disulfide bond formation by the hypertriglyceridemia-associated p.Gly185Cys APOA5 variant (rs2075291). Arterioscler Thromb Vasc Biol 2014; 34:2254-60. [PMID: 25127531 DOI: 10.1161/atvbaha.114.304027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
OBJECTIVE Apolipoprotein A-V (apoA-V) is a low-abundance plasma protein that modulates triacylglycerol homeostasis. Gene transfer studies were undertaken in apoa5 (-/-) mice to define the mechanism underlying the correlation between the single-nucleotide polymorphism c.553G>T in APOA5 and hypertriglyceridemia. APPROACH AND RESULTS Adeno-associated virus (AAV) 2/8-mediated gene transfer of wild-type apoA-V induced a dramatic lowering of plasma triacylglycerol in apoa5 (-/-) mice, whereas AAV2/8-Gly162Cys apoA-V (corresponding to the c.553G>T single-nucleotide polymorphism: rs2075291; p.Gly185Cys when numbering includes signal sequence) had a modest effect. Characterization studies revealed that plasma levels of wild-type and G162C apoA-V in transduced mice were similar and within the physiological range. Fractionation of plasma from mice transduced with AAV2/8-G162C apoA-V indicated that, unlike wild-type apoA-V, >50% of G162C apoA-V was recovered in the lipoprotein-free fraction. Nonreducing SDS-PAGE immunoblot analysis provided evidence that G162C apoA-V present in the lipoprotein-free fraction, but not that portion associated with lipoproteins, displayed altered electrophoretic mobility consistent with disulfide-linked heterodimer formation. Immunoprecipitation followed by liquid chromatography/mass spectrometry of human plasma from subjects homozygous for wild-type APOA5 and c.553G>T APOA5 revealed that G162C apoA-V forms adducts with extraneous plasma proteins including fibronectin, kininogen-1, and others. CONCLUSIONS Substitution of Cys for Gly at position 162 of mature apoA-V introduces a free cysteine that forms disulfide bonds with plasma proteins such that its lipoprotein-binding and triacylglycerol-modulation functions are compromised.
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Affiliation(s)
- Vineeta Sharma
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Andrzej Witkowski
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - H Ewa Witkowska
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Andrew Dykstra
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Jens B Simonsen
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Lisa Nelbach
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Jennifer A Beckstead
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Clive R Pullinger
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - John P Kane
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Mary J Malloy
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Gordon Watson
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Trudy M Forte
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.)
| | - Robert O Ryan
- From the Children's Hospital Oakland Research Institute, CA (V.S., A.W., J.B.S., L.N., J.A.B., G.W., T.M.F., R.O.R.); Department of Obstetrics, Gynecology and Reproductive Sciences, UCSF Sandler-Moore Mass Spectrometry Core Facility, San Francisco, CA (H.E.W., A.D.); and Cardiovascular Research Institute, University of California, San Francisco (C.R.P., J.P.K., M.J.M.).
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Apolipoprotein A-V level may contribute to the development of obesity-associated dyslipidemia. Obes Res Clin Pract 2014; 7:e415-9. [PMID: 24304484 DOI: 10.1016/j.orcp.2012.08.192] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 07/31/2012] [Accepted: 08/11/2012] [Indexed: 11/20/2022]
Abstract
AIM In a mice study, insulin suppressed apolipoprotein A-V (apoA-V) gene expression in a dose dependent manner. Thus, we investigated the association between apoA-V levels and dyslipidemias in obese children with hyperinsulinemia. METHODS The subjects were 17 obese children (15 male, 2 female) aged 11.8 ± 2.4 years. Total cholesterol (TC), high-density lipoprotein cholesterol (HDLC), triglyceride (TG), apoA-V and insulin levels were determined. RESULTS Obese children with hyperinsulinemia had greater percent overweight, higher TG level, lower HDLC level and lower apoA-V level than those without hyperinsulinemia. In simple regression analysis, apoA-V level correlated negatively with TG (r = -0.613, p = 0.0152) and insulin levels (r = -0.566, p = 0.0279), and positively correlated with HDLC (r = 0.811, p = 0.0002). In stepwise regression analysis, insulin level emerged as the independent determinant of TG level after apoA-V level was taken into account, whereas apoA-V emerged as the independent determinant of HDLC level after adjusting for insulin level. CONCLUSIONS Insulin may be a potent regulator of serum apoA-V level in obesity, and apoA-V level may partly contribute to the development of obesity-associated dyslipidemia.
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Kang R, Kim M, Chae JS, Lee SH, Lee JH. Consumption of whole grains and legumes modulates the genetic effect of the APOA5 -1131C variant on changes in triglyceride and apolipoprotein A-V concentrations in patients with impaired fasting glucose or newly diagnosed type 2 diabetes. Trials 2014; 15:100. [PMID: 24690159 PMCID: PMC3974230 DOI: 10.1186/1745-6215-15-100] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 03/19/2014] [Indexed: 01/30/2023] Open
Abstract
Background The apolipoprotein A5 gene (APOA5) -1131 T > C polymorphism is associated with mild hypertriglyceridemia in type 2 diabetic subjects, and interacts with dietary fat in the determination of triglyceride concentrations. We examined whether a substitution of whole grains and legumes for refined rice in a high carbohydrate diet (about 65% of energy derived from carbohydrate) may modify the effect of this variant on changes in apolipoprotein A-V (apoA-V) and triglyceride concentrations. Methods We genotyped the APOA5 -1131 T > C in individuals with impaired fasting glucose (IFG) or newly diagnosed type 2 diabetes, who were randomly assigned to either a group ingesting whole grain and legume meals daily or a control group for 12 weeks. Results After dietary intervention, we observed significant interactions between the APOA5 -1131 T > C polymorphism and carbohydrate sources (whole grains and legumes versus refined rice) in the determination of mean percent changes in triglyceride and apoA-V (P interactions <0.001 and =0.038, respectively). In the refined rice group (n = 93), the carriers of the risk C allele (n = 50) showed a greater increase in the mean percent changes of triglyceride and apoA-V than noncarriers after adjusting for HOMA-IR (P = 0.004 and 0.021, respectively). The whole grain and legume group (n = 92), however, showed a decrease in fasting glucose, HOMA-IR, and triglyceride, and an increase in apoA-V, irrespective of genotype. Conclusions The data showed that the magnitude of the genetic effect of the APOA5 -1131C variant on triglyceride and apoA-V levels was modulated when substituting consumption of whole grains and legumes for refined rice as a carbohydrate source in IFG or diabetic subjects. Trial registration ClinicalTrials.gov: NCT01784952.
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Affiliation(s)
| | | | | | | | - Jong Ho Lee
- Department of Food and Nutrition, College of Human Ecology, National Leading Research Laboratory of Clinical Nutrigenetics/Nutrigenomics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
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Caussy C, Charrière S, Marçais C, Di Filippo M, Sassolas A, Delay M, Euthine V, Jalabert A, Lefai E, Rome S, Moulin P. An APOA5 3' UTR variant associated with plasma triglycerides triggers APOA5 downregulation by creating a functional miR-485-5p binding site. Am J Hum Genet 2014; 94:129-34. [PMID: 24387992 DOI: 10.1016/j.ajhg.2013.12.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 12/02/2013] [Indexed: 11/29/2022] Open
Abstract
APOA5 c.*158C>T (rs2266788), located in the 3' UTR, belongs to APOA5 haplotype 2 (APOA5*2), which is strongly associated with plasma triglyceride levels and modulates the occurrence of both moderate and severe hypertriglyceridemia. Individuals with APOA5*2 display reduced APOA5 expression at the posttranscriptional level. However, the functionality of this haplotype remains unclear. We hypothesized that the hypertriglyceridemic effects of APOA5*2 could involve miRNA regulation in the APOA5 3' UTR. Bioinformatic studies have identified the creation of a potential miRNA binding site for liver-expressed miR-485-5p (MIRN485-5p) in the mutant APOA5 3' UTR with the c.*158C allele. In human embryonic kidney 293T (HEK293T) cells cotransfected with an APOA5 3' UTR luciferase reporter vector and a miR485-5p precursor, c.*158C allele expression was significantly decreased. Moreover, in HuH-7 cells endogenously expressing miR-485-5p, we observed that luciferase activity was significantly lower in the presence of the c.*158C allele than in the presence of the c.*158T allele, which was completely reversed by a miR-485-5p inhibitor. We demonstrated that the rare c.*158C APOA5 allele creates a functional target site for liver-expressed miR-485-5p. Therefore, we propose that the well-documented hypertriglyceridemic effect of APOA5*2 involves an APOA5 posttranscriptional downregulation mediated by miR-485-5p.
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Affiliation(s)
- Cyrielle Caussy
- Fédération d'Endocrinologie, Maladies Métaboliques, Diabète, et Nutrition, Hôpital Louis Pradel, Hospices Civils de Lyon, 69677 Bron Cedex, France; Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France
| | - Sybil Charrière
- Fédération d'Endocrinologie, Maladies Métaboliques, Diabète, et Nutrition, Hôpital Louis Pradel, Hospices Civils de Lyon, 69677 Bron Cedex, France; Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France.
| | - Christophe Marçais
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France; Laboratoire de Biochimie Moléculaire et Métabolique, Centre de Biologie Sud, Centre Hospitalier Lyon-Sud, Hospices Civils de Lyon, 69495 Pierre-Bénite Cedex, France
| | - Mathilde Di Filippo
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France; Département de Biochimie et Biologie Moléculaire, Centre de Biologie et de Pathologie Est, Hospices Civils de Lyon, 69677 Bron Cedex, France
| | - Agnès Sassolas
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France; Département de Biochimie et Biologie Moléculaire, Centre de Biologie et de Pathologie Est, Hospices Civils de Lyon, 69677 Bron Cedex, France
| | - Mireille Delay
- Laboratoire de Biochimie Moléculaire et Métabolique, Centre de Biologie Sud, Centre Hospitalier Lyon-Sud, Hospices Civils de Lyon, 69495 Pierre-Bénite Cedex, France
| | - Vanessa Euthine
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France
| | - Audrey Jalabert
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France
| | - Etienne Lefai
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France
| | - Sophie Rome
- Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France
| | - Philippe Moulin
- Fédération d'Endocrinologie, Maladies Métaboliques, Diabète, et Nutrition, Hôpital Louis Pradel, Hospices Civils de Lyon, 69677 Bron Cedex, France; Laboratoire Carmen, Institut National de la Santé et de la Recherche Médicale U1060, Institut National de la Recherche Agronomique U1235, Institut National des Sciences Appliquées de Lyon, Université Claude Bernard Lyon 1, 69621 Villeurbanne Cedex, France
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Fathy MM, Wahab AAA, Tabozada S, Ibrahim M, Aref W, Hamid MAA. Association of apolipoprotein A5 gene 1131T/C polymorphism with dyslipidemia and insulin resistance in Egyptian patients with metabolic syndrome. COMPARATIVE CLINICAL PATHOLOGY 2013; 22:1245-1250. [DOI: 10.1007/s00580-012-1558-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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van den Berg SAA, Heemskerk MM, Geerling JJ, van Klinken JB, Schaap FG, Bijland S, Berbée JFP, van Harmelen VJA, Pronk ACM, Schreurs M, Havekes LM, Rensen PCN, van Dijk KW. Apolipoprotein A5 deficiency aggravates high-fat diet-induced obesity due to impaired central regulation of food intake. FASEB J 2013; 27:3354-62. [PMID: 23650188 DOI: 10.1096/fj.12-225367] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Mutations in apolipoprotein A5 (APOA5) have been associated with hypertriglyceridemia in humans and mice. This has been attributed to a stimulating role for APOA5 in lipoprotein lipase-mediated triglyceride hydrolysis and hepatic clearance of lipoprotein remnant particles. However, because of the low APOA5 plasma abundance, we investigated an additional signaling role for APOA5 in high-fat diet (HFD)-induced obesity. Wild-type (WT) and Apoa5(-/-) mice fed a chow diet showed no difference in body weight or 24-h food intake (Apoa5(-/-), 4.5±0.6 g; WT, 4.2±0.5 g), while Apoa5(-/-) mice fed an HFD ate more in 24 h (Apoa5(-/-), 2.8±0.4 g; WT, 2.5±0.3 g, P<0.05) and became more obese than WT mice. Also, intravenous injection of APOA5-loaded VLDL-like particles lowered food intake (VLDL control, 0.26±0.04 g; VLDL+APOA5, 0.11±0.07 g, P<0.01). In addition, the HFD-induced hyperphagia of Apoa5(-/-) mice was prevented by adenovirus-mediated hepatic overexpression of APOA5. Finally, intracerebroventricular injection of APOA5 reduced food intake compared to injection of the same mouse with artificial cerebral spinal fluid (0.40±0.11 g; APOA5, 0.23±0.08 g, P<0.01). These data indicate that the increased HFD-induced obesity of Apoa5(-/-) mice as compared to WT mice is at least partly explained by hyperphagia and that APOA5 plays a role in the central regulation of food intake.
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Long S, Chen Z, Han Y, Christopher DM, Zhang C, Yang Y, Tian Y. Relationship between the distribution of plasma HDL subclasses and the polymorphisms of APOA5 in hypertriglyceridemia. Clin Biochem 2013; 46:733-9. [PMID: 23499587 DOI: 10.1016/j.clinbiochem.2013.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 02/26/2013] [Accepted: 03/03/2013] [Indexed: 11/26/2022]
Abstract
AIMS This study aims to examine the possible associations between high density lipoprotein (HDL) subclass distribution and APOA5-1131T>C polymorphism in hypertriglyceridemia. METHODS The distribution of HDL subclasses was quantified by 2-dimensional electrophoresis in conjunction with immunodetection method. The APOA5-1131T>C polymorphism was identified in 95 hypertriglyceridemic (HTG) patients and 102 healthy subjects by polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP). RESULTS The APOA5-1131C (C) allele frequency was higher in the HTG group than in the control group. Plasma triglycerides (TG) were significantly higher and apoA5 was significantly lower in patients with the C allele when compared to patients with the APOA5-1131T (T) allele, even more dramatically so in the APOA5-1131CC homozygote. In both the HTG group and the control group, the frequency of the C allele was positively correlated with levels of TG, total cholesterol (TC), low density lipoprotein cholesterol (LDL-C) and apolipoprotein B100 (apoB100), and negatively correlated with levels of high density lipoprotein cholesterol (HDL-C), apolipoprotein A1 (apoA1) and apolipoprotein A5 (apoA5) (P<0.001). In all subjects, the frequency of the C allele was positively correlated with the level of small-sized HDL (preβ(1)-HDL and HDL(3a)), and negatively correlated with levels of HDL(2a) and HDL(2b). CONCLUSION Changes in HDL subclass distributions in HTG may be related to the APOA5-1131T>C polymorphism. This polymorphism leads to a general shift towards smaller-sized HDL.
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Affiliation(s)
- Shiyin Long
- Department of Biochemistry and Molecular Biology, University of South China, Hengyang, Hunan 421001, PR China
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Kujiraoka T, Nakamoto T, Sugimura H, Iwasaki T, Ishihara M, Hoshi T, Horie Y, Ogawa K, Todoroki M, Nakatani Y, Banba N, Yasu T, Hattori H. Clinical Significance of Plasma Apolipoprotein F in Japanese Healthy and Hypertriglyceridemic Subjects. J Atheroscler Thromb 2013; 20:380-90. [DOI: 10.5551/jat.13706] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Zheng XY, Zhao SP, Yan H. The role of apolipoprotein A5 in obesity and the metabolic syndrome. Biol Rev Camb Philos Soc 2012; 88:490-8. [PMID: 23279260 DOI: 10.1111/brv.12005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 11/10/2012] [Accepted: 11/20/2012] [Indexed: 12/17/2022]
Affiliation(s)
- Xiao-Yan Zheng
- Department of Cardiology; The Second Xiangya Hospital, Central South University; Changsha; 410011; China
| | - Shui-Ping Zhao
- Department of Cardiology; The Second Xiangya Hospital, Central South University; Changsha; 410011; China
| | - Hu Yan
- Institute of Mental Health; The Second Xiangya Hospital, Central South University; Changsha; 410011; China
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Associations of apolipoprotein A5 with triglyceride, adiponectin and insulin resistance in patients with impaired glucose regulation and type 2 diabetes mellitus. Int J Diabetes Dev Ctries 2012. [DOI: 10.1007/s13410-012-0102-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Sundaram M, Yao Z. Intrahepatic role of exchangeable apolipoproteins in lipoprotein assembly and secretion. Arterioscler Thromb Vasc Biol 2012; 32:1073-8. [PMID: 22517365 DOI: 10.1161/atvbaha.111.241455] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Exchangeable apolipoproteins, composed mainly of amphipathic α-helices, are associated with various plasma lipoproteins and play an important role in the metabolism of those lipoproteins to which they bind. Accumulating experimental evidence suggests that exchangeable apolipoproteins, such as apoE, apoA-IV, and apoC-III, also play a role intracellularly in facilitating lipid recruitment at different stages of very low-density lipoprotein assembly and trafficking through the endoplasmic reticulum-Golgi secretory compartments. Experimental evidence also suggests that apoA-I may become lipidated intracellularly through mechanisms dependent on or independent of ATP-binding cassette transporter A1. Thus, expression of these secretory proteins may exert an impact on hepatic triglyceride and cholesterol homeostasis during their transit from the endoplasmic reticulum through the Golgi apparatus. This review summarizes findings related to the modulation of intracellular assembly of very low-density lipoprotein and high-density lipoprotein by exchangeable apolipoproteins.
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Affiliation(s)
- Meenakshi Sundaram
- Department of Biochemistry, Microbiology, and Immunology, Ottawa Institute of Systems Biology, University of Ottawa, Ontario, Canada
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Yang Y, Walijee SM, Jin J, Zhao SP, Peng DQ. Serum apolipoprotein A-V in patients with coronary artery disease and its association with triglyceride. J Clin Lipidol 2012; 6:462-8. [PMID: 23009782 DOI: 10.1016/j.jacl.2012.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 02/06/2012] [Accepted: 02/13/2012] [Indexed: 10/28/2022]
Abstract
BACKGROUND Apolipoprotein A-V (ApoA-V) has been shown to play an important role in the metabolism of plasma triglyceride (TG) levels. However, data for the relationship between serum ApoA-V and TG level and the association between ApoA-V levels and the risk of coronary artery disease (CAD) are inconsistent. OBJECTIVE To investigate plasma ApoA-V level and its association with TG in patients with CAD determined by angiography. METHODS Three hundred forty subjects who underwent coronary angiography (CAG) were classified into a CAD group (n = 211) and a non-CAD group (n = 129) according to the results of their CAG. Serum ApoA-V levels were determined by enzyme-linked immunosorbent assays. RESULTS Patients in the CAD group had greater ApoA-V levels than controls (192.0 ± 114.6 ng/mL vs 164.4 ± 107.5 ng/mL, P < .05). The concentration of ApoA-V was positively correlated to TG level (r = 0.229, P < .01). This correlation was more intense in non-CAD group (r = 0.306, P < .01) than in CAD group (r = 0.172, P < .05). ApoA-V was positively associated with Gensini score. However, the contribution of ApoA-V to Gensini score and CAD risk disappeared after adjustment for the TG level. CONCLUSION The positive correlation between serum ApoA-V and TG differs in strength between control and CAD patients. The correlation between ApoA-V and CAD is confounded by the effect of TG. We speculate that the increase of ApoA-V may be a consequence of compensation for the increased demand for plasma TG hydrolysis.
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Affiliation(s)
- Yang Yang
- Department of Cardiology, The Second Xiangya Hospital, Central South University, Changsha, 410011 Hunan, PR China
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Li YY, Yin RX, Lai CQ, Li M, Long XJ, Li KL, Liu WY, Zhang L, Wu JZ. Association of apolipoprotein A5 gene polymorphisms and serum lipid levels. Nutr Metab Cardiovasc Dis 2011; 21:947-956. [PMID: 20708914 DOI: 10.1016/j.numecd.2010.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Revised: 02/22/2010] [Accepted: 04/13/2010] [Indexed: 10/19/2022]
Abstract
BACKGROUND AND AIMS Apolipoprotein (APO) A5 gene polymorphisms have been associated with increased plasma triglyceride (TG), but the results are inconsistent. The present study was undertaken to detect the APOA5 gene polymorphisms and their associations with lipid profiles in the Guangxi Hei Yi Zhuang and Han populations. METHODS AND RESULTS Genotyping of the APOA5 -1131T>C, c.553G>T and c.457G>A was performed in 490 subjects of Hei Yi Zhuang and 540 participants of Han Chinese aged 15-89 years. The -1131C allele frequency was higher in high total cholesterol (TC) than in normal TC subgroups in both the ethnic groups (P<0.05). The c.553T allele frequency was higher in high TG than in normal TG subgroups (P<0.01), in high APOB than in normal APOB subgroups in Hei Yi Zhuang (P<0.05), or in females than in males in Han (P<0.01). The c.457A allele frequency in Han was higher in high TG than in normal TG subgroups, in low APOA1 than in normal APOA1 subgroups, in males than in females, or in normal APOB than in high APOB subgroups (P<0.05-0.01). The levels of TC, low-density lipoprotein cholesterol and APOB in Hei Yi Zhuang were correlated with -1131T>C genotype or allele, and the levels of TG were associated with c.553G>T genotype (P<0.05). The levels of TG, APOA1 and APOB in Han were correlated with c.457G>A genotype or allele, and the levels of TC were associated with -1131T>C allele (P<0.05). CONCLUSIONS The differences in the lipid profiles between the two ethnic groups might partly result from different APOA5 gene-environmental interactions.
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Affiliation(s)
- Y-Y Li
- Department of Cardiology, Institute of Cardiovascular Diseases, The First Affiliated Hospital, Guangxi Medical University, Nanning 530021, Guangxi, PR China
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Apolipoprotein A-V; a potent triglyceride reducer. Atherosclerosis 2011; 219:15-21. [DOI: 10.1016/j.atherosclerosis.2011.07.019] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 07/03/2011] [Accepted: 07/04/2011] [Indexed: 11/21/2022]
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Huang YJ, Lin YL, Chiang CI, Yen CT, Lin SW, Kao JT. Functional importance of apolipoprotein A5 185G in the activation of lipoprotein lipase. Clin Chim Acta 2011; 413:246-50. [PMID: 22008704 DOI: 10.1016/j.cca.2011.09.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Revised: 08/12/2011] [Accepted: 09/29/2011] [Indexed: 11/25/2022]
Abstract
BACKGROUND Apolipoprotein A5 (APOA5) over-expression enhances lipolysis of triglyceride (TG) through stimulation of lipoprotein lipase (LPL) activity; however, an APOA5 G185C variant was found associated with hypertriglyceridemia. The aim of this study was, therefore, to explore the importance of APOA5 185GG in the activation of LPL. METHODS A fragment containing mature human APOA5 cDNA was obtained by RT-PCR and subcloned into pET-15b vector. Site-directed mutagenesis was performed to generate 19 variants. Recombinant human APOA5 wild type and variants were produced in Escherichia coli, and then activation of LPL was measured. RESULTS Activity of APOA5 variants on LPL-mediated 1,2-dimyristoyl-sn-glycero-3-phosphocholine hydrolysis was reduced by 17 to 74% in comparison to wild type APOA5 (P<0.0001). All variants also showed reduced activation (P<0.0001) of LPL-mediated hydrolysis of very low-density lipoprotein (VLDL); activation abilities of APOA5 variants ranged from 31 to 81% of wild-type APOA5. CONCLUSIONS APOA5 residue 185G is very important in LPL-mediated VLDL hydrolysis, and any mutation at this residue will decrease LPL activation and concomitant TG modulation.
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Affiliation(s)
- Yi-Jan Huang
- Department of Clinical Laboratory Sciences and Medical Biotechnology, College of Medicine, National Taiwan University, Taiwan
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Association of the Apolipoprotein A5 Gene -1131T>C Polymorphism with Serum Lipids in Korean Subjects: Impact of Sasang Constitution. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2011; 2012:598394. [PMID: 21860654 PMCID: PMC3157201 DOI: 10.1155/2012/598394] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 04/19/2011] [Accepted: 05/17/2011] [Indexed: 11/21/2022]
Abstract
Apolipoprotein A5 (APOA5) was identified as a strong modulator of serum lipids. Moreover, an APOA5 gene −1131T>C polymorphism has been associated with serum lipids, but the results are inconsistent according to ethnic and racial groups. We have genotyped and analyzed 1,619 outpatients of Korean oriental medicine hospitals who were classified into three Sasang constitution groups (SCGs), So-Yang (SY), So-Eum (SE), and Tae-Eum (TE). There were no significant difference in the distribution of the APOA5 −1131T>C genotype among the three SCGs. Subjects with the C allele in SY and TE showed significantly lower serum high-density lipoprotein cholesterol (HDL-C) and higher triglyceride (TG) levels than noncarriers of the C allele. These results show the differences in the prevalence of decreasing serum HDL-C and elevating serum TG levels along with APOA5 −1131T>C polymorphism according to SCG and suggest that SCG may act as a significant risk factor for hypo-HDL-C-emia and hypertriglyceridemia susceptibility.
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Matsumori A, Shimada T, Hattori H, Shimada M, Mason JW. Autoantibodies against cardiac troponin I in patients presenting with myocarditis. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.cvdpc.2011.02.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Abstract
PURPOSE OF REVIEW Sortilins are sorting receptors that direct proteins through secretory and endocytic pathways of the cell. Previously, these receptors have been shown to play important roles in regulating protein transport in neurons and to control neuronal viability and death in many diseases of the nervous system. Recent data, including genome-wide association studies, now suggest equally important functions for sortilins in control of systemic lipoprotein metabolism and risk of cardiovascular disease. This review discusses the evidence implicating two members of this gene family, sortilin and SORLA, in cardiovascular processes. RECENT FINDINGS SORLA is a multifunctional receptor expressed in macrophages and vascular smooth muscle cells. It may act proatherogenic by promoting intimal SMC migration and by regulating apolipoprotein A-V dependent activation of lipoprotein lipase to modulate systemic triglyceride levels. Sortilin, encoded by the cardiovascular risk locus 1p13.3, is a novel regulator of hepatic lipoprotein production. It interacts with apolipoprotein B-100 to control release of very low-density lipoproteins, thereby affecting plasma cholesterol concentrations. SUMMARY Recent data shed light on the importance of sorting receptors in control of cellular and systemic lipoprotein metabolism and how altered trafficking pathways may represent a major risk factor for dyslipidemia and atherosclerosis in the human population.
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Yin RX, Li YY, Liu WY, Zhang L, Wu JZ. Interactions of the apolipoprotein A5 gene polymorphisms and alcohol consumption on serum lipid levels. PLoS One 2011; 6:e17954. [PMID: 21423763 PMCID: PMC3056790 DOI: 10.1371/journal.pone.0017954] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Accepted: 02/18/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Little is known about the interactions of apolipoprotein (Apo) A5 gene polymorphisms and alcohol consumption on serum lipid profiles. The present study was undertaken to detect the interactions of ApoA5-1131T>C, c.553G>T and c.457G>A polymorphisms and alcohol consumption on serum lipid levels. METHODOLOGY/PRINCIPAL FINDINGS A total of 516 nondrinkers and 514 drinkers were randomly selected from our previous stratified randomized cluster samples. Genotyping was performed by polymerase chain reaction and restriction fragment length polymorphism. The levels of serum total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C), ApoA1 and ApoB were higher in drinkers than in nondrinkers (P<0.05-0.001). The genotypic and allelic frequencies of three loci were not different between the two groups. The interactions between -1131T>C genotypes and alcohol consumption on ApoB levels (P<0.05) and the ApoA1/ApoB ratio (P<0.01), between c.553G>T genotypes and alcohol consumption on low-density lipoprotein cholesterol (LDL-C) levels (P<0.05) and the ApoA1/ApoB ratio (P<0.05), and between c.457G>A genotypes and alcohol consumption on TG levels (P<0.001) were detected by factorial regression analysis after controlling for potential confounders. Four haplotypes (T-G-G, C-G-G, T-A-G and C-G-T) had frequencies ranging from 0.06 to 0.87. Three haplotypes (C-G-G, T-A-G, and C-G-T) were significantly associated with serum lipid parameters. The -1131T>C genotypes were correlated with TG, and c.553G>T and c.457G>A genotypes were associated with HDL-C levels in nondrinkers (P<0.05 for all). For drinkers, the -1131T>C genotypes were correlated with TC, TG, LDL-C, ApoB levels and the ApoA1/ApoB ratio (P<0.01 for all); c.553G>T genotypes were correlated with TC, TG, HDL-C and LDL-C levels (P<0.05-0.01); and c.457G>A genotypes were associated with TG, LDL-C, ApoA1 and ApoB levels (P<0.05-0.01). CONCLUSIONS The differences in some serum lipid parameters between the drinkers and nondrinkers might partly result from different interactions of the ApoA5 gene polymorphisms and alcohol consumption.
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Affiliation(s)
- Rui-Xing Yin
- Department of Cardiology, Institute of Cardiovascular Diseases, The First Affiliated Hospital, Guangxi Medical University, Nanning, Guangxi, People's Republic of China.
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Ong KL, Jiang CQ, Liu B, Jin YL, Tso AWK, Tam S, Wong KS, Tomlinson B, Cheung BMY, Lin JM, Yue XJ, Lam KSL, Lam TH, Thomas GN. Association of a genetic variant in the apolipoprotein A5 gene with the metabolic syndrome in Chinese. Clin Endocrinol (Oxf) 2011; 74:206-13. [PMID: 21054477 DOI: 10.1111/j.1365-2265.2010.03899.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Single nucleotide polymorphisms (SNPs) in the apolipoprotein A5 gene (APOA5) are associated with hypertriglyceridaemia in our population. We studied the associations of SNPs in APOA5 with the metabolic syndrome (MetS) in the Hong Kong and Guangzhou Chinese. METHODS We genotyped five tagging SNPs in 1330 unrelated subjects from the Hong Kong Cardiovascular Risk Factor Prevalence Study cohort with follow-up after a median interval of 6·4 years; 1952 subjects from the Guangzhou Biobank Cohort Study-Cardiovascular Disease Subcohort were used to replicate the findings. The MetS was defined according to the consensus criteria proposed jointly by several organizations in 2009. RESULTS The SNP rs662799 (-1131T>C) was associated with the MetS (odds ratio = 1·47, P = 0·00082) and the number of its components present (regression coefficient = 0·204, P = 4·6 × 10(-5) ) after adjusting for age, sex, smoking, drinking and education in Hong Kong subjects at baseline. Similar association of this SNP was found in Hong Kong subjects at follow-up (P = 0·010 and 0·00021, respectively) and in Guangzhou subjects (P = 0·0041 and 0·017, respectively). The association of rs662799 with the number of the MetS components was significant regardless of age, sex, obesity and alcohol drinking, but almost disappeared after further adjusting for plasma triglycerides. CONCLUSION Our results showed that the -1131T>C polymorphism in APOA5 was associated with the MetS because of its strong effect on plasma triglycerides. This may partly explain the higher cardiovascular risk in people with this polymorphism.
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Affiliation(s)
- Kwok Leung Ong
- Department of Medicine, University of Hong Kong, Hong Kong
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Ebara T, Hattori H, Murase T, Okubo M. Reduced plasma apolipoprotein A-V concentrations in two lecithin:cholesterol acyltransferase deficient patients. Clin Chem Lab Med 2010; 48:1359-60. [PMID: 20604726 DOI: 10.1515/cclm.2010.260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Jiang CQ, Liu B, Cheung BMY, Lam TH, Lin JM, Li Jin Y, Yue XJ, Ong KL, Tam S, Wong KS, Tomlinson B, Lam KSL, Thomas GN. A single nucleotide polymorphism in APOA5 determines triglyceride levels in Hong Kong and Guangzhou Chinese. Eur J Hum Genet 2010; 18:1255-60. [PMID: 20571505 DOI: 10.1038/ejhg.2010.93] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Single nucleotide polymorphisms (SNPs) in the apolipoprotein A5 (APOA5) gene have been associated with hypertriglyceridaemia. We investigated which SNPs in the APOA5 gene were associated with triglyceride levels in two independent Chinese populations. In all, 1375 subjects in the Hong Kong Cardiovascular Risk Factor Prevalence Study were genotyped for five tagging SNPs chosen from HapMap. Replication was sought in 1996 subjects from the Guangzhou Biobank Cohort Study. Among the five SNPs, rs662799 (-1131T>C) was strongly related to log-transformed triglyceride levels among Hong Kong subjects (β=0.192, P=2.6 × 10(-13)). Plasma triglyceride level was 36.1% higher in CC compared to TT genotype. This association was confirmed in Guangzhou subjects (β=0.159, P=1.3 × 10(-12)), and was significantly irrespective of sex, age group, obesity, metabolic syndrome, hypertension, diabetes, smoking and alcohol drinking. The odds ratios and 95% confidence interval for plasma triglycerides ≥1.7 mmol/l associated with TC and CC genotypes were, respectively, 1.81 (1.37-2.39) and 2.22 (1.44-3.43) in Hong Kong and 1.27 (1.05-1.54) and 1.97 (1.42-2.73) in Guangzhou. Haplotype analysis suggested the association was due to rs662799 only. The corroborative findings in two independent populations indicate that the APOA5-1131T>C polymorphism is an important and clinically relevant determinant of plasma triglyceride levels in the Chinese population.
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Decreased apolipoprotein A5 is implicated in insulin resistance-related hypertriglyceridemia in obesity. Atherosclerosis 2009; 210:563-8. [PMID: 20047745 DOI: 10.1016/j.atherosclerosis.2009.12.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 12/01/2009] [Accepted: 12/03/2009] [Indexed: 11/21/2022]
Abstract
Hypertriglyceridemia is associated insulin resistance in obese people. Recently identified apolipoprotein A5 (apoA5) is involved in triglyceride (TG) metabolism. This study was to investigate the role of apoA5 in insulin resistance-related hypertriglyceridemia in obesity. 682 participants including 340 non-obese individuals and 342 obese individuals were recruited in this study. Plasma apoA5 levels were measured. The insulin resistance in participants was assessed by homeostasis model assessment of insulin resistance (HOMA-IR). An insulin resistant and hypertriglyceridemic rat model was established by high-fructose diet with obese Zucker rats as positive controls. Besides, two insulin resistant models in vitro were induced by insulin and tumor necrosis factor-alpha (TNFalpha) in HepG2 cells. Obese participants had lower plasma apoA5 levels. Plasma apoA5 levels were inversely correlated with TG, body mass index and HOMA-IR in humans. Furthermore, hepatic and plasma apoA5 reduced in fructose-fed rats whereas no significant changes of apoA5 were observed in obese Zucker rats. In addition, treatment of HepG2 cells with insulin and TNFalpha decreased apoA5 expression and increased TG content. Thus, decreased apolipoprotein A5 is implicated in insulin resistance-related hypertriglyceridemia in obesity.
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Association of APOA5 and APOC3 gene polymorphisms with plasma apolipoprotein A5 level in patients with metabolic syndrome. Biochem Biophys Res Commun 2009; 391:587-91. [PMID: 19932084 DOI: 10.1016/j.bbrc.2009.11.103] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2009] [Accepted: 11/17/2009] [Indexed: 11/21/2022]
Abstract
Apolipoprotein A5 gene (APOA5) variants are associated with increased plasma triglycerides, a risk factor for the metabolic syndrome (MS), but a correlation with apolipoprotein C3 (APOC3) genotypes is controversial. We investigated the correlation of APOA5 genotypes with plasma apoA5 levels and APOC3 genotypes in MS patients from a Romanian population. APOA5 (-1131T>C, c.56C>G) and APOC3 (-482C>T, -455T>C) genotypes and plasma apoA5 concentration were determined in MS patients and healthy subjects. Results showed higher apoA5 levels in plasma and high density lipoproteins (HDL) from MS patients, carriers of the APOA5 c.56G allele, as compared to MS carriers of APOA5 -1131C allele or the common genotype. ApoA5 levels in plasma and HDL fraction from MS carriers of -1131C and c.56G alleles correlated positively with plasma triglycerides levels and negatively with HDL-cholesterol in MS carriers of c.56G allele. Higher frequencies of APOC3 -482T and -455C alleles were detected in MS patients compared with healthy subjects. We demonstrated the association of APOC3 -482T and -455C with APOA5 -1131C allele, but not with c.56G allele in MS patients. We propose APOA5c.56C>G as a functional polymorphism, whereas APOA5 -1131T>C is not an independent risk factor, being effective only when associated with APOC3 -482T or -455C alleles.
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Okubo M, Ishihara M, Iwasaki T, Ebara T, Aoyama Y, Murase T, Hattori H. A novel APOA5 splicing mutation IVS2+1g>a in a Japanese chylomicronemia patient. Atherosclerosis 2009; 207:24-5. [DOI: 10.1016/j.atherosclerosis.2009.03.046] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2009] [Revised: 03/26/2009] [Accepted: 03/28/2009] [Indexed: 11/30/2022]
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Huang XS, Zhao SP, Zhang Q, Bai L, Hu M. Association of plasma apolipoprotein AV with lipid profiles in patients with acute coronary syndrome. Atherosclerosis 2009; 204:e99-102. [DOI: 10.1016/j.atherosclerosis.2008.11.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Revised: 11/19/2008] [Accepted: 11/23/2008] [Indexed: 10/21/2022]
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Abe Y, Okada T, Kuromori Y, Hara M, Saito E, Iwata F, Harada K, Mugishima H. Apolipoprotein A-V is a Potent Modulator of HDL and VLDL Components in Preadolescent Children. J Atheroscler Thromb 2009; 16:121-6. [DOI: 10.5551/jat.e356] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Yuriko Abe
- Department of Pediatrics and Child Health, Nihon University School of Medicine
| | - Tomoo Okada
- Department of Pediatrics and Child Health, Nihon University School of Medicine
| | - Yuki Kuromori
- Department of Pediatrics and Child Health, Nihon University School of Medicine
| | - Mitsuhiko Hara
- Department of Pediatrics, Tokyo Metropolitan Hiroo Hospital
| | - Emiko Saito
- Department of Pediatrics, Tokyo Metropolitan Hiroo Hospital
| | - Fujihiko Iwata
- Department of Pediatrics and Child Health, Nihon University School of Medicine
| | - Kensuke Harada
- Department of Pediatrics and Child Health, Nihon University School of Medicine
| | - Hideo Mugishima
- Department of Pediatrics and Child Health, Nihon University School of Medicine
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49
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Hyun YJ, Jang Y, Chae JS, Kim JY, Paik JK, Kim SY, Yang JY, Ordovas JM, Ko YG, Lee JH. Association of apolipoprotein A5 concentration with serum insulin and triglyceride levels and coronary artery disease in Korean men. Atherosclerosis 2008; 205:568-73. [PMID: 19185864 DOI: 10.1016/j.atherosclerosis.2008.12.035] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2008] [Revised: 12/01/2008] [Accepted: 12/16/2008] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Whereas the relation between apolipoprotein A5 (APOA5) gene polymorphisms and triglycerides (TG) levels is well established, the associations between apoA5 concentrations, TG and coronary artery disease (CAD) remain controversial. Therefore, we investigated these relations in the setting of a case-control study involving Korean males. METHODS ApoA5, TG, insulin, free fatty acid (FFA) and lipoprotein profiles were determined using a cross-sectional design in 777 healthy controls and 367 CAD patients. RESULTS Plasma apoA5 concentration was lower in CAD patients than controls (192.7+/-5.2 vs. 237.2+/-3.7ng/ml, P<0.001). Values in the second and top tertiles of apoA5 were associated with a decreased odds ratio (OR) for CAD when compared with values in the bottom tertile; OR for apoA5 top tertile was 0.33 (95% CI, 0.23-0.47) in the age- and BMI-adjusted model and 0.35 (95% CI, 0.23-0.56) following additional adjustments for smoking, drinking status, blood pressure, TG and HDL-cholesterol. After adjustment for age and BMI, plasma apoA5 concentration was negatively correlated with serum TG (r=-0.188, P<0.001) and insulin (r=-0.185, P<0.001) in normotriglyceridemic controls (TG<150mg/dL, n=509) whereas apoA5 was positively correlated with serum TG in hypertriglyceridemic controls (TG> or =150mg/dL, n=268) (r=0.246, P<0.001) and total CAD patients (r=0.177, P<0.01). Regardless of TG levels and CAD status, apoA5 concentration was positively correlated with HDL-cholesterol and FFA levels. CONCLUSIONS Our data supports an inverse association between plasma apoA5 concentrations and CAD risk, probably due to the observed negative correlations of apoA5 with TGs and insulin, although these correlations were affected by TG levels.
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Affiliation(s)
- Yae Jung Hyun
- Yonsei University Research Institute of Science for Aging, Seoul, Republic of Korea
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50
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Forte TM, Shu X, Ryan RO. The ins (cell) and outs (plasma) of apolipoprotein A-V. J Lipid Res 2008; 50 Suppl:S150-5. [PMID: 19050314 DOI: 10.1194/jlr.r800050-jlr200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Apolipoprotein A-V (apoA-V) has a close interrelationship with plasma triglyceride (TG). Since the discovery of the apoA-V gene in 2001, we have learned that single nucleotide polymorphisms in this gene correlate with altered plasma TG levels in humans, while genetically engineered mice manifest unique TG phenotypes. Studies of recombinant apoA-V protein have revealed that it is composed of two independently folded structural domains. The C-terminal domain possesses high lipid binding affinity, while the N-terminal domain adopts a helix bundle molecular architecture. A sequence element with high positive charge character, between residues 185 and 228, functions in binding of apoA-V to heparan sulfate proteoglycans as well as to members of the low-density lipoprotein receptor family and glycosylphosphatidylinositol high-density lipoprotein binding protein1. These interactions may be related to the capacity of this protein to regulate TG levels. ApoA-V is poorly secreted from transfected cultured hepatoma cell lines and is present in plasma at exceedingly low levels. Studies of apoA-V intracellular trafficking revealed an association with cytosolic lipid droplets. Thus, it is conceivable that apoA-V may also modulate TG metabolism within the cell. Much remains to be learned about this fascinating yet confounding member of the class of exchangeable apolipoproteins.
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Affiliation(s)
- Trudy M Forte
- Center for Prevention of Obesity, Diabetes, and Cardiovascular Disease, Children's Hospital Oakland Research Institute, Oakland, CA 94609, USA.
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