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Ginsberg HN, Goldberg IJ. Broadening the Scope of Dyslipidemia Therapy by Targeting APOC3 (Apolipoprotein C3) and ANGPTL3 (Angiopoietin-Like Protein 3). Arterioscler Thromb Vasc Biol 2023; 43:388-398. [PMID: 36579649 PMCID: PMC9975058 DOI: 10.1161/atvbaha.122.317966] [Citation(s) in RCA: 32] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 12/13/2022] [Indexed: 12/30/2022]
Abstract
The positive relationship between increased levels of circulating triglycerides and cardiovascular events has been observed for decades. Driven by genetic cohort studies, inhibitors of APOC3 (apolipoprotein C3) and ANGPTL (angiopoietin-like protein) 3 that reduce circulating triglycerides are poised to enter clinical practice. We will review the biology of how inhibition of these 2 proteins affects circulating lipoproteins as well as the current state of clinical development of monoclonal antibodies, antisense oligonucleotides, and silencing RNAs targeting APOC3 and ANGPTL3.
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Affiliation(s)
- Henry N Ginsberg
- Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University New York (H.N.G.)
| | - Ira J Goldberg
- Division of Endocrinology, Diabetes and Metabolism, New York University Grossman School of Medicine, New York (I.J.G.)
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Ma J, Bai Y, Liu M, Jiao T, Chen Y, Yuan B, Liu B, Zeng L, Ming Z, Li W, Sun R, Yang X, Yang S. Pretreatment HDL-C and ApoA1 are predictive biomarkers of progression-free survival in patients with EGFR mutated advanced non-small cell lung cancer treated with TKI. Thorac Cancer 2022; 13:1126-1135. [PMID: 35274478 PMCID: PMC9013640 DOI: 10.1111/1759-7714.14367] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 02/10/2022] [Accepted: 02/11/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND We aimed to explore the correlation between blood lipids (high density lipoprotein cholesterol [HDL-C] and apolipoprotein A1 [ApoA1]) and epidermal growth factor receptor (EGFR) T790M mutation, as well as its predictive role in clinical efficacy and progression-free survial (PFS) in advanced non-small cell lung cancer (NSCLC) patients treated with EGFR tyrosine kinase inhibitors (EGFR-TKI). METHODS We retrospectively collected information of 153 patients with advanced NSCLC harboring exon EGFR mutation and receiving EGFR-TKI. RESULTS The best cutoff value for HDL-C and ApoA1 was determined to be 1.15 and 1.14 mmol/l. The overall response rate (ORR) was 67.7% in the high HDL-C group and 46.6% in the low HDL-C group, respectively. The ORR of the high ApoA1 group showed a significant increase than that of the low ApoA1 group (68.1% vs. 38.5%). The mean ApoA1 level of the EGFR T790M mutation-positive group was significantly higher than that of the EGFR T790M mutation-negative group (1.13 g/l vs. 1.01 g/l). Patients with high ApoA1 levels were related to the EGFR T790M mutation (r = 0.324). (3) The median progression-free survival (PFS) of the high HDL-C group and low HDL-C group were 13.00 months and 10.20 months. The median PFS of the high ApoA1 group and the low ApoA1 group were 12.10 and 10.00 months, respectively. Multivariate Cox stepwise regression model analysis demonstrated ECOG PS, pathological type and HDL-C were confirmed as critical and independent predictors of PFS. CONCLUSIONS Patients with EGFR T790M mutations often show higher ApoA1 levels. Peripheral serum HDL-C and ApoA1 before treatment can be used as potential significant factors for predicting clinical efficacy and PFS in advanced NSCLC patients treated with EGFR-TKI.
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Affiliation(s)
- Juan Ma
- Department of Respiratory and Critical Care Medicine, Shaanxi Provincial People's Hospital, Xi'an, China
| | - Ying Bai
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Mei Liu
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Tong Jiao
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Yang Chen
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Bo Yuan
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Boxuan Liu
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Lizhong Zeng
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Zongjuan Ming
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Wei Li
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Ruiying Sun
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Xia Yang
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Shuanying Yang
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
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Pirro M, Ricciuti B, Rader DJ, Catapano AL, Sahebkar A, Banach M. High density lipoprotein cholesterol and cancer: Marker or causative? Prog Lipid Res 2018; 71:54-69. [DOI: 10.1016/j.plipres.2018.06.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 05/15/2018] [Accepted: 06/02/2018] [Indexed: 12/11/2022]
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Wang L, Chi PD, Chen H, Xiang J, Xia ZJ, Zhang YJ. Low level of high-density lipoprotein cholesterol correlates with poor prognosis in extranodal natural killer/T cell lymphoma. Tumour Biol 2013; 35:2141-9. [DOI: 10.1007/s13277-013-1284-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Accepted: 10/02/2013] [Indexed: 02/05/2023] Open
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Jia L, Bai H, Fu M, Xu Y, Yang Y, Long S. Relationship between plasma HDL subclasses distribution and apoA-I gene polymorphisms. Clin Chim Acta 2005; 360:37-45. [PMID: 15925353 DOI: 10.1016/j.cccn.2005.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2005] [Revised: 03/31/2005] [Accepted: 04/01/2005] [Indexed: 11/20/2022]
Abstract
BACKGROUND It is generally accepted that apolipoprotein (apo) A-I is the dominant structural apolipoprotein of HDL particles and different HDL subclasses have distinct but interrelated metabolic functions. HDL is known to directly affect the atherogenic process hence changes in HDL subclasses distribution may be related to the incidence and prevalence of atherosclerosis. METHODS The ApoA-I contents (mg/l) of plasma HDL subclasses were determined by 2-dimensional gel electrophoresis coupled with immunodetection and apoA-I genotypes were assayed by PCR-RFLP in 307 Chinese subjects (169 males, 138 females). RESULTS The G/G and C/C genotypes were the most frequent at -78 bp and +83 bp of apoA-I gene, respectively. There were no significant differences in the frequencies of rare A allele at -78 bp and rare T allele at +83 bp between males and females. Compared with the G/G carriers, G/A and A/A carriers had significantly higher plasma concentrations of TG, apoC-II, apoC-III, apoA-I contents of prebeta(1)-HDL, HDL(3a) and TG/HDL-C ratio. And in addition, A/A carriers had significantly lower apoA-I contents of HDL(2a) and HDL(2b). Females had increased plasma concentrations of apoA-I, HDL-C, apoA-I contents of HDL(2a) and HDL(2b) while decreased apoA-I contents of prebeta(1)-HDL, HDL(3b) and TG/HDL-C ratio as compared to males carrying the same genotype. No significant differences were demonstrated on the concentrations of plasma lipids, lipoproteins, apolipoproteins and apoA-I contents of plasma HDL subclasses between the C/C and C/T subjects. CONCLUSION The G/A polymorphism at -78 bp of apoA-I gene was associated with changes of HDL subclasses distribution. There was a general shift towards smaller-sized HDL, which, in turn, indicated that reverse cholesterol transport (RCT) might be weakened and HDL maturation might be abnormal in the subjects with G/A mutation.
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Affiliation(s)
- Lianqun Jia
- Apolipoprotein Research Unit, Department of Biochemistry and Molecular Biology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, 610041 Sichuan, People's Republic of China
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6
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Kushwaha RS, McGill Jr HC, Hausheer FH. Effect of Synthetic Truncated Apolipoprotein C-I Peptide on Plasma Lipoprotein Cholesterol in Nonhuman Primates. J Biomed Biotechnol 2004; 2004:177-184. [PMID: 15467157 PMCID: PMC555771 DOI: 10.1155/s1110724304311010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The present studies were conducted to determine
whether a synthetic truncated apoC-I peptide that
inhibits CETP activity in baboons would raise plasma
HDL cholesterol levels in nonhuman primates with low
HDL levels. We used 2 cynomolgus monkeys and 3
baboons fed a cholesterol- and fat-enriched diet. In
cynomolgus monkeys, we injected synthetic truncated
apoC-I inhibitor peptide at a dose of 20 mg/kg
and, in baboons, at doses of 10, 15, and 20 mg/kg
at weekly intervals. Blood samples were collected 3
times a week and VLDL + LDL and HDL cholesterol
concentrations were measured. In cynomolgus monkeys,
administration of the inhibitor peptide caused a
rapid decrease in VLDL + LDL cholesterol
concentrations (30%–60%) and an increase in HDL
cholesterol concentrations (10%–20%). VLDL + LDL
cholesterol concentrations returned to baseline
levels in approximately 15 days. In baboons,
administration of the synthetic inhibitor peptide
caused a decrease in VLDL + LDL cholesterol (20%–60%)
and an increase in HDL cholesterol (10%–20%). VLDL
+ LDL cholesterol returned to baseline levels by
day 21, whereas HDL cholesterol concentrations
remained elevated for up to 26 days. ApoA-I
concentrations increased, whereas apoE and
triglyceride concentrations decreased. Subcutaneous
and intravenous administrations of the inhibitor
peptide had similar effects on LDL and HDL
cholesterol concentrations. There was no change in
body weight, food consumption, or plasma IgG
levels of any baboon during the study. These
studies suggest that the truncated apoC-I peptide can
be used to raise HDL in humans.
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Affiliation(s)
- Rampratap S. Kushwaha
- Department of Physiology and Medicine, Southwest Foundation for Biomedical Research, San Antonio, TX 78245-0549, USA
- *Rampratap S. Kushwaha:
| | - Henry C. McGill Jr
- Department of Physiology and Medicine, Southwest Foundation for Biomedical Research, San Antonio, TX 78245-0549, USA
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7
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Strauss JG, Frank S, Kratky D, Hämmerle G, Hrzenjak A, Knipping G, von Eckardstein A, Kostner GM, Zechner R. Adenovirus-mediated rescue of lipoprotein lipase-deficient mice. Lipolysis of triglyceride-rich lipoproteins is essential for high density lipoprotein maturation in mice. J Biol Chem 2001; 276:36083-90. [PMID: 11432868 DOI: 10.1074/jbc.m104430200] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Lipoprotein lipase (LPL) is the rate-limiting enzyme for the hydrolysis of triglycerides and the subsequent uptake of free fatty acids in extrahepatic tissues. Deficiency of LPL in humans (Type I hyperlipoproteinemia) is associated with massive chylomicronemia, low high density lipoprotein (HDL) cholesterol levels, and recurrent attacks of pancreatitis when not controlled by a strict diet. In contrast to humans, homozygous LPL knock-out mice (L0) do not survive suckling and die between 18 and 24 h after birth. In this study, an adenovirus-based protocol was utilized for the transient expression of LPL during the suckling period in an effort to rescue L0 mice. After a single intraperitoneal injection of 5x10(9) plaque-forming units of LPL-expressing virus immediately after birth, more than 90% of L0 mice survived the first days of life. 3% of L0 mice survived the entire suckling period and lived for up to 20 months, although LPL activity in mouse tissues and postheparin plasma was undetectable in all animals after 6 weeks of age. Adult LPL-deficient mice were smaller than their littermates until 2-3 months of age and exhibited very high triglyceride levels in the fed (4997 +/- 1102 versus 113.4 +/- 18.7 mg/dl) and fasted state (2007 +/- 375 versus 65.5 +/- 7.4 mg/dl). Plasma total cholesterol levels, free fatty acids, and ketone bodies were elevated in L0 mice, whereas plasma glucose was normal. Most strikingly, L0 mice lacked apoA-I-containing prebeta-HDL particles as well as mature HDL resulting in undetectable HDL cholesterol and HDL-apoA-I levels. HDL deficiency in plasma was evident despite normal apoA-I mRNA levels in the liver and normal apoA-I protein levels in plasma, which were predominantly found in the chylomicron fraction. The absence of prebeta-HDL and mature HDL particles supports the concept that the lipolysis of triglyceride-rich lipoproteins is an essential step for HDL maturation.
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Affiliation(s)
- J G Strauss
- Institute of Molecular Biology, Biochemistry, and Microbiology, University of Graz, Graz A-8010, Austria
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Heng CK, Low PS, Saha N. Variations in the promoter region of the apolipoprotein A-1 gene influence plasma lipoprotein(a) levels in Asian Indian neonates from Singapore. Pediatr Res 2001; 49:514-8. [PMID: 11264435 DOI: 10.1203/00006450-200104000-00013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We studied the influence of two DNA polymorphisms (-75 bp G/A and +83 bp C/T) in the promoter region of the apolipoprotein A-1 (apoA1) gene on cord plasma level of lipoprotein(a) [Lp(a)] in 1076 newborns of both genders from the three major ethnic groups in Singapore-Chinese, Malays, and Asian Indians. The frequency of the A: allele at -75 bp in the Indians was significantly lower than the Chinese and Malays. There was no linkage disequilibrium between the two sites studied. Both polymorphic sites were not significantly associated with any lipid factors except for Lp(a) levels in the Asian Indians. The AA and CC homozygotes were significantly associated with lower Lp(a) levels. These associations were specific only to the male Indian neonates. The genetic variations at the -75 and +83 bp explained 6.9% and 7.2%, respectively, of the total variability of plasma Lp(a) levels at birth in the Asian Indians. The Lp(a) levels were also significantly different between composite genotypes in the order GG/TT > GA/CT > GG/CT > GA/CC > GG/CC > AA/CC. The effects of the two polymorphisms seem to be additive as the composite genotypes were able to explain 14% of the Lp(a) variance, equivalent to the sum of the two constituent sites. Our results showed that there is significant ethnic- and gender-specific influence of the apoA1 gene on plasma Lp(a) levels at birth that is inherent and independent of known gene-environment interactions.
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Affiliation(s)
- C K Heng
- Department of Paediatrics, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074
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9
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Pussinen PJ, Malle E, Metso J, Sattler W, Raynes JG, Jauhiainen M. Acute-phase HDL in phospholipid transfer protein (PLTP)-mediated HDL conversion. Atherosclerosis 2001; 155:297-305. [PMID: 11254899 DOI: 10.1016/s0021-9150(00)00568-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In reverse cholesterol transport, plasma phospholipid transfer protein (PLTP) converts high density lipoprotein(3) (HDL(3)) into two new subpopulations, HDL(2)-like particles and prebeta-HDL. During the acute-phase reaction (APR), serum amyloid A (SAA) becomes the predominant apolipoprotein on HDL. Displacement of apo A-I by SAA and subsequent remodeling of HDL during the APR impairs cholesterol efflux from peripheral tissues, and might thereby change substrate properties of HDL for lipid transfer proteins. Therefore, the aim of this work was to study the properties of SAA-containing HDL in PLTP-mediated conversion. Enrichment of HDL by SAA was performed in vitro and in vivo and the SAA content in HDL varied between 32 and 58 mass%. These HDLs were incubated with PLTP, and the conversion products were analyzed for their size, composition, mobility in agarose gels, and apo A-I degradation. Despite decreased apo A-I concentrations, PLTP facilitated the conversion of acute-phase HDL (AP-HDL) more effectively than the conversion of native HDL(3), and large fusion particles with diameters of 10.5, 12.0, and 13.8 nm were generated. The ability of PLTP to release prebeta from AP-HDL was more profound than from native HDL(3). Prebeta-HDL formed contained fragmented apo A-I with a molecular mass of about 23 kDa. The present findings suggest that PLTP-mediated conversion of AP-HDL is not impaired, indicating that the production of prebeta-HDL is functional during the ARP. However, PLTP-mediated in vitro degradation of apo A-I in AP-HDL was more effective than that of native HDL, which may be associated with a faster catabolism of inflammatory HDL.
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Affiliation(s)
- P J Pussinen
- National Public Health Institute, Department of Biochemistry, Mannerheimintie 166, FIN-00300, Helsinki, Finland.
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10
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Tietge UJ, Maugeais C, Cain W, Grass D, Glick JM, de Beer FC, Rader DJ. Overexpression of secretory phospholipase A(2) causes rapid catabolism and altered tissue uptake of high density lipoprotein cholesteryl ester and apolipoprotein A-I. J Biol Chem 2000; 275:10077-84. [PMID: 10744687 DOI: 10.1074/jbc.275.14.10077] [Citation(s) in RCA: 142] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Plasma levels of high density lipoprotein (HDL) cholesterol and its major protein component apolipoprotein (apo) A-I are significantly reduced in both acute and chronic inflammatory conditions, but the basis for this phenomenon is not well understood. We hypothesized that secretory phospholipase A(2) (sPLA(2)), an acute phase protein that has been found in association with HDL, promotes HDL catabolism. A series of HDL metabolic studies were performed in transgenic mice that specifically overexpress human sPLA(2) but have no evidence of local or systemic inflammation. We found that HDL isolated from these mice have a significantly lower phospholipid and cholesteryl ester and significantly greater triglyceride content. The fractional catabolic rate (FCR) of (125)I-HDL was significantly faster in sPLA(2) transgenic mice (4.08 +/- 0.01 pools/day) compared with control wild-type littermates (2.16 +/- 0.48 pools/day). (125)I-HDL isolated from sPLA(2) transgenic mice was catabolized significantly faster than (131)I-HDL isolated from wild-type mice after injection in wild-type mice (p < 0.001). Injection of (125)I-tyramine-cellobiose-HDL demonstrated significantly greater degradation of HDL apolipoproteins in the kidneys of sPLA(2) transgenic mice compared with control mice (p < 0.05). The fractional catabolic rate of [(3)H]cholesteryl ether HDL was significantly faster in sPLA(2)-overexpressing mice (6.48 +/- 0.24 pools/day) compared with controls (4.80 +/- 0.72 pools/day). Uptake of [(3)H] cholesteryl ether into the livers and adrenals of sPLA(2) transgenic mice was significantly enhanced compared with control mice. In summary, these data demonstrate that overexpression of sPLA(2) alone in the absence of inflammation causes profound alterations of HDL metabolism in vivo and are consistent with the hypothesis that sPLA(2) may promote HDL catabolism in acute and chronic inflammatory conditions.
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Affiliation(s)
- U J Tietge
- Department of Medicine, University of Pennsylvania Health System, Philadelphia, Pennsylvania 19104, USA
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11
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Hosoai H, Webb NR, Glick JM, Tietge UJ, Purdom MS, de Beer FC, Rader DJ. Expression of serum amyloid A protein in the absence of the acute phase response does not reduce HDL cholesterol or apoA-I levels in human apoA-I transgenic mice. J Lipid Res 1999. [DOI: 10.1016/s0022-2275(20)32143-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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12
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Danek GM, Valenti M, Baralle FE, Romano M. The A/G polymorphism in the -78 position of the apolipoprotein A-I promoter does not have a direct effect on transcriptional efficiency. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1398:67-74. [PMID: 9602064 DOI: 10.1016/s0167-4781(98)00029-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A promoter polymorphism A/G at position 78 bp upstream of the transcription initiation site characterizes the human apolipoprotein A-I gene. Some studies correlated the higher Apo A-I levels or increased Apo A-I transcription efficiency with the A allele, while other studies did not confirm these results. We have investigated the in vitro effects of this transition on the transcriptional efficiency of ApoAI gene by creating two sets of identical constructs with the whole Apo A-I promoter, carrying the A or the G, linked to the complete ApoAI gene. The relative activity of the two promoter alleles was determined through a quantitative RT-PCR system after transient tranfections of human HepG2 cell line in basal state and after stimulation with retinoic acid or 17beta-estradiol. Our results exclude differences in promoter activity linked to the A or G promoter alleles either in basal or in stimulated conditions. The data suggest that the A/G polymorphism does not directly affect the transcriptional efficiency of ApoAI gene, although it may be in linkage disequilibrium with other regulatory sequences and the combination of these elements may explain the contradictory results of the ApoAI gene expression.
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Affiliation(s)
- G M Danek
- International Centre for Genetic Engineering and Biotechnology, Padriciano 99, I-34012, Trieste, Italy
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13
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Wang XL, Liu SX, McCredie RM, Wilcken DE. Polymorphisms at the 5'-end of the apolipoprotein AI gene and severity of coronary artery disease. J Clin Invest 1996; 98:372-7. [PMID: 8755647 PMCID: PMC507440 DOI: 10.1172/jci118802] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Elevated HDL-cholesterol (C) and apo AI are associated with decreased coronary artery disease (CAD) risk. We determined distributions of two MspI polymorphisms of the apo AI gene, associated in other studies with increased HDL-C, among 644 patients aged < or = 65 years in relation to circulating lipids and CAD severity assessed angiographically. The rare allele distributions at both sites were in Hardy-Weinberg equilibrium in these patients but the base changes were not associated with HDL-C and apo AI levels. However, patients homozygous for the -75 bp substitution were more likely to have one or more significantly diseased vessels (> 50% luminal obstruction)(OR: 4.75, 95%CI: 1.10- 20.46) as also were patients with the rare +83 bp alleles (OR: 2.56, 95%CI: 1.13-5.81). While there was an additive effect of the two polymorphisms to have severe CAD (OR: 6.33, 95%CI: 1.33-30.02), the polymorphism at +83 bp remained significant in predicting CAD severity after adjusting for other variables in a logistic regression analysis (OR: 2.95, 95%CI: 1.26-6.90), which was also strongly associated with the positive family CAD history (P = 0.009). We conclude that patients with these base changes in this Australian coronary population do not have increased HDL-C and apo AI levels but do have more severe CAD.
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Affiliation(s)
- X L Wang
- Department of Cardiovascular Medicine, University of New South Wales, Australia
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Coresh J, Beaty TH, Prenger VL, Xu J, Kwiterovich PO. Segregation analysis of HDL3-C levels in families of patients undergoing coronary arteriography at an early age. Arterioscler Thromb Vasc Biol 1995; 15:1307-13. [PMID: 7670942 DOI: 10.1161/01.atv.15.9.1307] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
HDL cholesterol (HDL-C) level is a risk factor for coronary heart disease. Studies have shown a strong genetic influence on HDL-C levels in addition to environmental influences, but no definite major gene control has been demonstrated. Since HDL subfractions may better reflect the actions of distinct metabolic alterations than total HDL2 we tested the hypothesis that the amount of cholesterol in the denser HDL3 subfraction (HDL3-C) is under the control of a major gene. The study population included 676 family members of 116 probands who underwent coronary arteriography at an early age (men < or = 50 and women < or = 60 years). HDL3-C level was measured by using enzymatic methods after preparative ultracentrifugation at a density of 1.125 g/mL. HDL3-C was adjusted for age, gender, alcohol consumption, and smoking, which combined accounted for 3% of its variance. Segregation analysis was conducted on adjusted HDL3-C by using regressive models. The familial correlations for HDL3-C levels were spouse .03 +/- .08, parent-offspring .14 +/- .05, and sibling .24 +/- .05. The data strongly supported a codominant mendelian model, with the common allele coding for lower HDL3-C levels and the rarer allele (frequency, 25%) coding for higher HDL3-C levels. This major gene explained 34% of the variation in HDL3-C levels and 9% of the variation in total HDL-C levels. These results suggest that HDL3-C levels exhibit clearer genetic control than total HDL-C and may therefore be a useful target for further genetic studies.
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Affiliation(s)
- J Coresh
- Department of Epidemiology, Johns Hopkins School of Hygiene and Public Health, Baltimore, Md, USA
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