1
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Mitok KA, Keller MP, Attie AD. Sorting through the extensive and confusing roles of sortilin in metabolic disease. J Lipid Res 2022; 63:100243. [PMID: 35724703 PMCID: PMC9356209 DOI: 10.1016/j.jlr.2022.100243] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 06/10/2022] [Accepted: 06/13/2022] [Indexed: 01/06/2023] Open
Abstract
Sortilin is a post-Golgi trafficking receptor homologous to the yeast vacuolar protein sorting receptor 10 (VPS10). The VPS10 motif on sortilin is a 10-bladed β-propeller structure capable of binding more than 50 proteins, covering a wide range of biological functions including lipid and lipoprotein metabolism, neuronal growth and death, inflammation, and lysosomal degradation. Sortilin has a complex cellular trafficking itinerary, where it functions as a receptor in the trans-Golgi network, endosomes, secretory vesicles, multivesicular bodies, and at the cell surface. In addition, sortilin is associated with hypercholesterolemia, Alzheimer's disease, prion diseases, Parkinson's disease, and inflammation syndromes. The 1p13.3 locus containing SORT1, the gene encoding sortilin, carries the strongest association with LDL-C of all loci in human genome-wide association studies. However, the mechanism by which sortilin influences LDL-C is unclear. Here, we review the role sortilin plays in cardiovascular and metabolic diseases and describe in detail the large and often contradictory literature on the role of sortilin in the regulation of LDL-C levels.
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Affiliation(s)
- Kelly A Mitok
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Mark P Keller
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Alan D Attie
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, USA.
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2
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Paththinige CS, Sirisena ND, Dissanayake V. Genetic determinants of inherited susceptibility to hypercholesterolemia - a comprehensive literature review. Lipids Health Dis 2017; 16:103. [PMID: 28577571 PMCID: PMC5457620 DOI: 10.1186/s12944-017-0488-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 05/17/2017] [Indexed: 02/08/2023] Open
Abstract
Hypercholesterolemia is a strong determinant of mortality and morbidity associated with cardiovascular diseases and a major contributor to the global disease burden. Mutations in four genes (LDLR, APOB, PCSK9 and LDLRAP1) account for the majority of cases with familial hypercholesterolemia. However, a substantial proportion of adults with hypercholesterolemia do not have a mutation in any of these four genes. This indicates the probability of having other genes with a causative or contributory role in the pathogenesis of hypercholesterolemia and suggests a polygenic inheritance of this condition. Here in, we review the recent evidence of association of the genetic variants with hypercholesterolemia and the three lipid traits; total cholesterol (TC), HDL-cholesterol (HDL-C) and LDL-cholesterol (LDL-C), their biological pathways and the associated pathogenetic mechanisms. Nearly 80 genes involved in lipid metabolism (encoding structural components of lipoproteins, lipoprotein receptors and related proteins, enzymes, lipid transporters, lipid transfer proteins, and activators or inhibitors of protein function and gene transcription) with single nucleotide variants (SNVs) that are recognized to be associated with hypercholesterolemia and serum lipid traits in genome-wide association studies and candidate gene studies were identified. In addition, genome-wide association studies in different populations have identified SNVs associated with TC, HDL-C and LDL-C in nearly 120 genes within or in the vicinity of the genes that are not known to be involved in lipid metabolism. Over 90% of the SNVs in both these groups are located outside the coding regions of the genes. These findings indicates that there might be a considerable number of unrecognized processes and mechanisms of lipid homeostasis, which when disrupted, would lead to hypercholesterolemia. Knowledge of these molecular pathways will enable the discovery of novel treatment and preventive methods as well as identify the biochemical and molecular markers for the risk prediction and early detection of this common, yet potentially debilitating condition.
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Affiliation(s)
- C S Paththinige
- Human Genetics Unit, Faculty of Medicine, University of Colombo, Kynsey Road, Colombo, 00800, Sri Lanka.
| | - N D Sirisena
- Human Genetics Unit, Faculty of Medicine, University of Colombo, Kynsey Road, Colombo, 00800, Sri Lanka
| | - Vhw Dissanayake
- Human Genetics Unit, Faculty of Medicine, University of Colombo, Kynsey Road, Colombo, 00800, Sri Lanka
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3
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Goettsch C, Iwata H, Hutcheson JD, O'Donnell CJ, Chapurlat R, Cook NR, Aikawa M, Szulc P, Aikawa E. Serum Sortilin Associates With Aortic Calcification and Cardiovascular Risk in Men. Arterioscler Thromb Vasc Biol 2017; 37:1005-1011. [PMID: 28279970 DOI: 10.1161/atvbaha.116.308932] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 02/27/2017] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Genome-wide association studies and preclinical studies demonstrated a role of sortilin in lipid metabolism, inflammation, and vascular calcification-all cardiovascular risk factors. We evaluated the association of serum sortilin levels with the risk of major adverse cerebrovascular and cardiovascular events (MACCE) and the severity of abdominal aortic calcification (AAC). APPROACH AND RESULTS A cohort of community-dwelling men aged ≥50 years (n=830) was assessed. At baseline, sortilin levels were measured by ELISA, and AAC was assessed on lateral spine scans obtained by dual-energy X-ray absorptiometry. Men aged ≥60 years (n=745) were followed up prospectively for the incidence of MACCE. During the median follow-up of 7.9 years, 76 MACCE occurred. The unadjusted incidence of MACCE across increasing sortilin quartiles was 8.0, 7.4, 19.8, and 20.3 per 1000 person-years. In multivariate-adjusted analysis, sortilin associated with increased risk of MACCE (hazard ratio, 1.70 per SD; 95% confidence interval, 1.30-2.20; P<0.001). The third and fourth quartiles associated with 3.42-fold (95% confidence interval, 1.61-7.25; P<0.005) and 3.82-fold (95% confidence interval, 1.77-8.26; P<0.001) higher risk of MACCE compared with the first quartile. High sortilin also predicted MACCE independent of traditional Framingham risk factors. Higher sortilin associated with higher odds of severe AAC (score>5) after adjustment for confounders (odds ratio, 1.43 per SD; 95% confidence interval, 1.10-1.85; P<0.01). The highest sortilin quartile associated with 2-fold higher odds of severe AAC (versus 3 lower quartiles combined). After adjustment for low-density lipoprotein cholesterol, the odds of severe AAC remained significant. CONCLUSIONS In older men, higher serum sortilin levels associated with higher MACCE risk and severe AAC independently of relevant confounders, including C-reactive protein and low-density lipoprotein cholesterol. This finding, however, needs to be validated in other cohorts.
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Affiliation(s)
- Claudia Goettsch
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Hiroshi Iwata
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Joshua D Hutcheson
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Christopher J O'Donnell
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Roland Chapurlat
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Nancy R Cook
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Masanori Aikawa
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Pawel Szulc
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.)
| | - Elena Aikawa
- From the Center for Interdisciplinary Cardiovascular Sciences (C.G., H.I., J.D.H., M.A., E.A.) and Center for Excellence in Vascular Biology (M.A., E.A.), Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Boston VA Healthcare, Department of Cardiology, MA (C.J.O.); INSERM UMR 1033, University of Lyon, Hôpital Edouard Herriot, Department of Rheumatology and Bone Pathology, France (R.C., P.S.); and Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA (N.R.C.).
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4
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Many GM, Kendrick Z, Deschamps CL, Sprouse C, Tosi LL, Devaney JM, Gordish-Dressman H, Barfield W, Hoffman EP, Houmard JA, Pescatello LS, Vogel HJ, Shearer J, Hittel DS. Genetic characterization of physical activity behaviours in university students enrolled in kinesiology degree programs. Appl Physiol Nutr Metab 2016; 42:278-284. [PMID: 28177749 DOI: 10.1139/apnm-2016-0441] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Studies of physical activity behaviours have increasingly shown the importance of heritable factors such as genetic variation. Nonsynonymous polymorphisms of alpha-actinin 3 (ACTN3) and the β-adrenergic receptors 1 and 3 (ADRB1 and ADRB3) have been previously associated with exercise capacity and cardiometabolic health. We thus hypothesized that these polymorphisms are also related to physical activity behaviours in young adults. To test this hypothesis we examined relationships between ACTN3 (R577X), ARDB1 (Arg389Gly), ADRB3 (Trp64Arg), and physical activity behaviours in university students. We stratified for student enrollment in kinesiology degree programs compared with nonmajors as we previously found this to be a predictor of physical activity. We did not identify novel associations between physical activity and ACTN3. However, the minor alleles of ADRB1 and ADRB3 were significantly underrepresented in kinesiology students compared with nonmajors. Furthermore, carriers of the ADRB1 minor allele reported reduced participation in moderate physical activity and increased afternoon fatigue compared with ancestral allele homozygotes. Together, these findings suggest that the heritability of physical activity behaviours in young adults may be linked to nonsynonymous polymorphisms within β-adrenergic receptors.
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Affiliation(s)
- Gina M Many
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA.,f Departments of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham (UAB), Birmingham, AL, USA
| | - Zachary Kendrick
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA
| | | | - Courtney Sprouse
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA
| | - Laura L Tosi
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA
| | - Joseph M Devaney
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA
| | | | - Whitney Barfield
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA
| | - Eric P Hoffman
- a Genetic Medicine, Children's National Medical Center, Washington, DC, USA
| | - Joseph A Houmard
- c Department of Kinesiology, East Carolina University, Greenville, NC, USA
| | | | - Hans J Vogel
- e Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Jane Shearer
- b Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.,e Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Dustin S Hittel
- e Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
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5
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Deschamps CL, Connors KE, Klein MS, Johnsen VL, Shearer J, Vogel HJ, Devaney JM, Gordish-Dressman H, Many GM, Barfield W, Hoffman EP, Kraus WE, Hittel DS. The ACTN3 R577X Polymorphism Is Associated with Cardiometabolic Fitness in Healthy Young Adults. PLoS One 2015; 10:e0130644. [PMID: 26107372 PMCID: PMC4480966 DOI: 10.1371/journal.pone.0130644] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Accepted: 05/21/2015] [Indexed: 12/03/2022] Open
Abstract
Homozygosity for a premature stop codon (X) in the ACTN3 “sprinter” gene is common in humans despite the fact that it reduces muscle size, strength and power. Because of the close relationship between skeletal muscle function and cardiometabolic health we examined the influence of ACTN3 R577X polymorphism over cardiovascular and metabolic characteristics of young adults (n = 98 males, n = 102 females; 23 ± 4.2 years) from our Assessing Inherent Markers for Metabolic syndrome in the Young (AIMMY) study. Both males and females with the RR vs XX genotype achieved higher mean VO2 peak scores (47.8 ± 1.5 vs 43.2 ±1.8 ml/O2/min, p = 0.002) and exhibited higher resting systolic (115 ± 2 vs 105 ± mmHg, p = 0.027) and diastolic (69 ± 3 vs 59 ± 3 mmHg, p = 0.005) blood pressure suggesting a role for ACTN3 in the maintenance of vascular tone. We subsequently identified the expression of alpha-actinin 3 protein in pulmonary artery smooth muscle, which may explain the genotype-specific differences in cardiovascular adaptation to acute exercise. In addition, we utilized targeted serum metabolomics to distinguish between RR and XX genotypes, suggesting an additional role for the ACTN3 R577X polymorphism in human metabolism. Taken together, these results identify significant cardiometabolic effects associated with possessing one or more functional copies of the ACTN3 gene.
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Affiliation(s)
- Chelsea L. Deschamps
- Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
| | - Kimberly E. Connors
- Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
| | - Matthias S. Klein
- Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
| | - Virginia L. Johnsen
- Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
| | - Jane Shearer
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
- Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
| | - Hans J. Vogel
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
| | - Joseph M. Devaney
- Children’s National Medical Center, 111 Michigan Ave NW, Washington DC, United States of America
| | - Heather Gordish-Dressman
- Children’s National Medical Center, 111 Michigan Ave NW, Washington DC, United States of America
| | - Gina M. Many
- Children’s National Medical Center, 111 Michigan Ave NW, Washington DC, United States of America
| | - Whitney Barfield
- Children’s National Medical Center, 111 Michigan Ave NW, Washington DC, United States of America
| | - Eric P. Hoffman
- Children’s National Medical Center, 111 Michigan Ave NW, Washington DC, United States of America
| | - William E. Kraus
- Duke University, 304 Research Drive, Durham, NC, United States of America
| | - Dustin S. Hittel
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada
- * E-mail:
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6
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Many GM, Lutsch A, Connors KE, Shearer J, Brown HC, Ash G, Pescatello LS, Gordish-Dressman H, Barfield W, Dubis G, Houmard JA, Hoffman EP, Hittel DS. Examination of Lifestyle Behaviors and Cardiometabolic Risk Factors in University Students Enrolled in Kinesiology Degree Programs. J Strength Cond Res 2015; 30:1137-46. [PMID: 25647655 DOI: 10.1519/jsc.0000000000000871] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Preventing physical inactivity and weight gain during college is critical in decreasing lifelong obesity and associated disease risk. As such, we sought to compare cardiometabolic risk factors and lifestyle behaviors between college students enrolled in kinesiology and non-kinesiology degree programs to assess whether health and exercise degree programs may influence health behaviors and associated disease risk outcomes. Anthropometrics, fasting blood glucose, insulin, lipid profiles and HbA1c%, blood pressure, and peak oxygen consumption (V[Combining Dot Above]O2peak) were assessed in 247 healthy college students. The homeostasis model assessment of insulin sensitivity (HOMA) was calculated using glucose and insulin levels. Self-reported physical activity from the Paffenbarger questionnaire was collected to estimate the average caloric expenditure due to different types of physical activities. Despite no significant differences in body mass index or waist circumference between groups, kinesiology majors presented with ∼20% lower fasting insulin levels and HOMA (p = 0.01; p < 0.01, respectively) relative to nonmajors. Kinesiology majors reported increased weekly participation in vigorous-intensity sport and leisure activities and, on average, engaged in >300 metabolic equivalent-h·wk, whereas non-kinesiology majors engaged in <300 MET-h wk (p = 0.01). Our data suggest that students enrolled in kinesiology degree programs display improved healthy behaviors and associated outcomes (parameters of glucose homeostasis). Practical outcomes of this research indicate that implementing components of a comprehensive kinesiology curriculum encourages improved health behaviors and associated cardiometabolic risk factors.
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Affiliation(s)
- Gina M Many
- 1Children's National Medical Center, Research Center for Genetic Medicine, Washington, District of Columbia; 2Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada; 3Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada; 4Human Performance Laboratory, College of Agriculture, Health and Natural Resources, University of Connecticut, Storrs, Connecticut; and 5Human Performance Laboratory, East Carolina University, Greenville, North Carolina
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7
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Connors KE, Karlos AE, Gnatiuk EA, Shearer J, Reimer RA, Hittel DS. SORT1
Protective Allele Is Associated With Attenuated Postprandial. ACTA ACUST UNITED AC 2014; 7:576-82. [DOI: 10.1161/circgenetics.114.000534] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
Elevated levels of lipids and lipoproteins have strong genetic determinants and are recognized as key risk factors for atherogenesis and cardiovascular disease, particularly in the postprandial state. The aim of the study to determine whether young adults, when stratified by genotype at the rs646776 variant of the 1p13 locus, displayed differential postprandial responses to an oral fat tolerance test.
Methods and Results—
Participants (n=30) received a high-fat mixed meal (91 g; 55% kcal from fat) after an overnight fast and a fat-exclusion meal (3.9 g; 6% kcal from fat) at 8 hours postprandially. Blood samples were obtained at
t
=0, 2, 4, 6, 8, and 24 hours for lipoprotein analyses via nuclear magnetic resonance profiling. Carriers of the minor, protective allele (TC/CC) displayed lower fasting (TC/CC, 30.1±3.0 nmol/L versus TT, 48.8±5.1 nmol/L;
P
<0.01) and mean postprandial (TC/CC, 44.2±3.1 nmol/L versus TT, 57.0±4.5 nmol/L;
P
=0.03) very low-density lipoprotein and chylomicron particle number in addition to triglyceride content when compared with individuals homozygous for the major, risk allele (TT).
Conclusions—
We report a novel association between the
SORT1
1p13 locus and extent of postprandial lipaemia. These results provide evidence of decreased exposure to atherogenic particles in carriers of the minor
SORT1
allele, suggesting relative protection against cardiovascular disease when compared with TT homozygotes.
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Affiliation(s)
- Kimberly E. Connors
- From the Faculty of Kinesiology (K.E.C., E.A.G., J.S., R.A.R.), Faculty of Medicine (A.E.K., J.S., R.A.R.), Department of Biochemistry and Molecular Biology within the Faculty of Medicine (J.S., R.A.R., D.S.H.), University of Calgary, Calgary, Alberta, Canada
| | - Angela E. Karlos
- From the Faculty of Kinesiology (K.E.C., E.A.G., J.S., R.A.R.), Faculty of Medicine (A.E.K., J.S., R.A.R.), Department of Biochemistry and Molecular Biology within the Faculty of Medicine (J.S., R.A.R., D.S.H.), University of Calgary, Calgary, Alberta, Canada
| | - Elizabeth A. Gnatiuk
- From the Faculty of Kinesiology (K.E.C., E.A.G., J.S., R.A.R.), Faculty of Medicine (A.E.K., J.S., R.A.R.), Department of Biochemistry and Molecular Biology within the Faculty of Medicine (J.S., R.A.R., D.S.H.), University of Calgary, Calgary, Alberta, Canada
| | - Jane Shearer
- From the Faculty of Kinesiology (K.E.C., E.A.G., J.S., R.A.R.), Faculty of Medicine (A.E.K., J.S., R.A.R.), Department of Biochemistry and Molecular Biology within the Faculty of Medicine (J.S., R.A.R., D.S.H.), University of Calgary, Calgary, Alberta, Canada
| | - Raylene A. Reimer
- From the Faculty of Kinesiology (K.E.C., E.A.G., J.S., R.A.R.), Faculty of Medicine (A.E.K., J.S., R.A.R.), Department of Biochemistry and Molecular Biology within the Faculty of Medicine (J.S., R.A.R., D.S.H.), University of Calgary, Calgary, Alberta, Canada
| | - Dustin S. Hittel
- From the Faculty of Kinesiology (K.E.C., E.A.G., J.S., R.A.R.), Faculty of Medicine (A.E.K., J.S., R.A.R.), Department of Biochemistry and Molecular Biology within the Faculty of Medicine (J.S., R.A.R., D.S.H.), University of Calgary, Calgary, Alberta, Canada
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8
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Klein MS, Connors KE, Shearer J, Vogel HJ, Hittel DS. Metabolomics reveals the sex-specific effects of the SORT1 low-density lipoprotein cholesterol locus in healthy young adults. J Proteome Res 2014; 13:5063-70. [PMID: 25182463 DOI: 10.1021/pr500659r] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Metabolite profiles of individuals possessing either the cardiovascular risk or protective variants of the low-density lipoprotein cholesterol (LDL-C) associated 1p13.3 locus of the SORT1 gene (rs646776) were analyzed. Serum metabolites and lipids were assessed using LC-MS-based metabolomics in a healthy young population (n = 138: 95 males, 43 females). Although no significant differences were observed in the combined cohort, divergent sex effects were identified. Females carrying the protective allele showed increased phosphatidylcholines, very long chain fatty acids (>C20), and unsaturated fatty acids. Unsaturated fatty acids are considered to be protective against cardiovascular disease. In contrast, males carrying the protective allele exhibited decreased long-chain fatty acids (≤C20) and sphingomyelins, which is similarly considered to decrease cardiovascular disease risk. No significant changes in clinically assessed lipids such as LDL-C, high-density lipoprotein (HDL-C), total cholesterol, or triglycerides were observed in females, whereas only LDL-C was significantly changed in males. This indicates that, apart from reducing LDL-C, other mechanisms may contribute to the protective effect of the SORT1 locus. Thus, the analysis of metabolic biomarkers might reveal early disease development that may be overlooked by relying on standard clinical parameters.
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Affiliation(s)
- Matthias S Klein
- Faculty of Kinesiology, ‡Department of Biochemistry and Molecular Biology, Faculty of Medicine, and §Department of Biological Sciences, University of Calgary , Calgary, Alberta T2N 1N4, Canada
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9
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Myslicki JP, Shearer J, Hittel DS, Hughey CC, Belke DD. O-GlcNAc modification is associated with insulin sensitivity in the whole blood of healthy young adult males. Diabetol Metab Syndr 2014; 6:96. [PMID: 25228926 PMCID: PMC4164748 DOI: 10.1186/1758-5996-6-96] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 08/27/2014] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Hemoglobin A1c (HbA1c) is the predominant diagnostic tool for diabetes diagnosis and progression. However, it has proven to be insensitive at pre-diabetic threshold values. O-linked-β-N-acetylglucosamine (O-GlcNAc) modification has emerged as a sensitive biomarker. The purpose of this study was to explore the sensitivity of O-GlcNAc expression as a potential marker of early metabolic dysfunction in a young adult population. Healthy, young males (18-35 y) from the Assessing Inherited Metabolic syndrome Markers in the Young study (AIMMY), were divided into low (LH,0.60) or high (HH,1.61) homeostatic model assessment of insulin resistance (HOMA-IR) cohorts. FINDINGS The relationships between a panel of anthropometric, metabolic measures and whole blood global protein O-GlcNAc was examined. O-GlcNAc and O-GlcNAc transferase (OGT) levels were quantified by immunoblotting and compared to anthropometric measures: body mass index (BMI), percentage body fat, aerobic fitness, blood glucose, triglycerides, HDL, insulin, and HbA1c. HOMA-IR cohorts showed no differences in BMI, blood glucose or HbA1c, but differed in percent body fat, plasma triglycerides, and circulating insulin. Greater O-GlcNAc expression was observed in the whole blood of HH compared to LH. Moreover, a positive association between HOMA-IR and O-GlcNAc emerged, while no relationship was found between HbA1c and HOMA-IR. This effect was not related to OGT expression. CONCLUSIONS Results indicate that O-GlcNAc has a greater sensitivity to metabolic status compared to HbA1c in this population. O-GlcNAc has the potential to serve as a screening tool for predicting future metabolic disturbances in a young healthy adult population free of any clinically relevant pathologies.
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Affiliation(s)
- Jason P Myslicki
- />Faculty of Kinesiology, University of Calgary, 3300 University Drive NW, Calgary, Alberta T2N 4N1 Canada
| | - Jane Shearer
- />Faculty of Kinesiology, University of Calgary, 3300 University Drive NW, Calgary, Alberta T2N 4N1 Canada
- />Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, Calgary, Alberta T2N 1N4 Canada
| | - Dustin S Hittel
- />Faculty of Kinesiology, University of Calgary, 3300 University Drive NW, Calgary, Alberta T2N 4N1 Canada
| | - Curtis C Hughey
- />Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, Calgary, Alberta T2N 1N4 Canada
| | - Darrell D Belke
- />Faculty of Kinesiology, University of Calgary, 3300 University Drive NW, Calgary, Alberta T2N 4N1 Canada
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