1
|
Safari S, Rafraf M, Malekian M, Molani-Gol R, Asghari-Jafarabadi M, Mobasseri M. Effects of vitamin D supplementation on metabolic parameters, serum irisin and obesity values in women with subclinical hypothyroidism: a double-blind randomized controlled trial. Front Endocrinol (Lausanne) 2023; 14:1306470. [PMID: 38179303 PMCID: PMC10764604 DOI: 10.3389/fendo.2023.1306470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 12/04/2023] [Indexed: 01/06/2024] Open
Abstract
Purpose Subclinical hypothyroidism is an early, mild form of hypothyroidism that may progress to overt hypothyroidism if untreated. The current study aimed to assess the effects of vitamin D supplementation on hormonal (thyroid stimulating hormone [TSH], triiodothyronine, thyroxine, and free thyroxine) parameters, lipid profiles, serum irisin, and obesity indices in women with subclinical hypothyroidism. Methods The present randomized, double-blind, placebo-controlled clinical trial was carried out on 44 women with subclinical hypothyroidism. The participants were allocated to two groups (22 patients in each group) that received vitamin D (50,000 IU/week) or placebo for 12 weeks. Fasting blood samples, anthropometric and body composition measurements, physical activity levels, and dietary intakes were collected at baseline and at the end of the study. Results Vitamin D supplementation significantly decreased TSH, total cholesterol, and fat mass percentage, and significantly increased serum vitamin D and irisin levels and fat-free mass percentage compared to the control group (all, p<0.05). Changes in thyroid hormones, other lipid profiles, and anthropometric indices were not significantly different between the groups. Conclusion Our study indicates that vitamin D administration improves serum TSH, total cholesterol, irisin, and body composition in women with subclinical hypothyroidism. More well-designed clinical trials are required to confirm these findings and clarify the effects of vitamin D supplementation on both genders of patients.Clinical trial registration: https://www.irct.ir/trial/57482, Identifier IRCT20100408003664N25.
Collapse
Affiliation(s)
- Sara Safari
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
- Nutrition Research Center, Department of Community Nutrition, Faculty of Nutrition and Food Science, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Maryam Rafraf
- Nutrition Research Center, Department of Community Nutrition, Faculty of Nutrition and Food Science, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mahsa Malekian
- Endocrine Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Roghayeh Molani-Gol
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
- Nutrition Research Center, Department of Community Nutrition, Faculty of Nutrition and Food Science, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Asghari-Jafarabadi
- Cabrini Research, Cabrini Health, Malvern, VIC, Australia
- School of Public Health and Preventative Medicine, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC, Australia
| | - Majid Mobasseri
- Endocrine Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| |
Collapse
|
2
|
George JA, Norris SA, Snyman T, Khambule L, Toman M, Crowther NJ. Longitudinal changes in vitamin D and its metabolites in pregnant South Africans. J Steroid Biochem Mol Biol 2021; 212:105949. [PMID: 34242778 DOI: 10.1016/j.jsbmb.2021.105949] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 06/28/2021] [Accepted: 06/30/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND Vitamin D deficiency (VDD) has been associated with adverse maternal and foetal outcomes and is determined by measuring 25 hydroxyvitamin D (25(OH)D). The 25(OH)D is catabolized to 24, 25-(OH) 2D and the ratio of 25(OH) D to 24, 25-(OH)2D, the vitamin D metabolite ratio (VMR), is thought to be a superior marker of VDD, being elevated in such states. The aims of this study were to assess the longitudinal vitamin D status of pregnant women by measuring cholecalciferol, 25(OH)D, 24, 25-(OH)2D and VMR at two time points and also to determine any association of vitamin D and metabolites with gestational age at birth, birth length and weight. METHODS We recruited 400 pregnant black African women in their first trimester (V1) and measured weights and heights. Ultrasound scans were performed for gestational age. Blood was drawn at V1 and at about 26 weeks (V2) of gestation for cholecalciferol, 25(OH)D, 24, 25-(OH)2D, VMR and parathyroid hormone (PTH). An OGTT was performed at V2 where fasting glucose, insulin and 30-minute glucose were measured. At birth, we measured birth weight, length and gestational age. Maternal insulin, PTH and vitamin D binding protein (VDBP) were measured by immunoassay. Maternal albumin was measured colorimetrically. Maternal cholecalciferol, 25(OH)D and 24, 25-(OH)2D, were measured by mass spectrometry and free and bioavailable vitamin D were calculated. Initial gestation was determined by ultrasound. We compared analytes by visit as well as by 25(OH)D status. Vitamin D deficiency (<30 nmol/L) was defined according to the National Academy of Medicine guidelines. Linear regression analysis was used to determine associations of vitamin D molecules with maternal blood pressure, fasting and 30-minute insulin and blood glucose and neonatal parameters. RESULTS Results are presented for participants for whom we had complete data (n = 330-346 depending on variable). The prevalence of vitamin D deficiency (VDD) was 35.8 % at V1 and 32.4 % at V2. Levels of 25(OH)D did not change significantly between visits. Levels of 24, 25(OH)2D dropped from the first to the second visit (17.64 ± 12.64 to 9.39 ± 9.07 nmol/L; p < 0.0001) while VMR increased ((3.15 (1.31; 7.67) to 7.90 (2.44; 25.98); p < 0.0001). The proportion of women with the lowest cholecalciferol concentrations increased at V2 compared to the V1 (36.1-42.8 %; p = 0.02). In multivariable regression models 25(OH)D was negatively associated with 30-minute glucose concentrations (p = 0.038) whilst 24, 25-(OH)2D was positively associated with fasting insulin (p = 0.017) and HOM A-I R (p = 0.023). There was no correlation of 25(OH)D or metabolites with infant birth weight, birth length or gestational age. CONCLUSIONS Maternal VDD is common in pregnant black South African women. Decreased VMR suggest that catabolism of 25(OH)D is reduced in pregnancy to maintain adequate free vitamin D levels.
Collapse
Affiliation(s)
- J A George
- Department of Chemical Pathology, National Health Laboratory Service and University of the Witwatersrand, South Africa.
| | - S A Norris
- MRC Developmental Pathways for Health Research Unit, Faculty of Health, University of the Witwatersrand, Johannesburg, South Africa
| | - T Snyman
- Department of Chemical Pathology, National Health Laboratory Service and University of the Witwatersrand, South Africa
| | - L Khambule
- Department of Chemical Pathology, University of the Witwatersrand, South Africa
| | - M Toman
- Department of Chemical Pathology, National Health Laboratory Service and University of the Witwatersrand, South Africa
| | - N J Crowther
- Department of Chemical Pathology, National Health Laboratory Service and University of the Witwatersrand, South Africa
| |
Collapse
|
3
|
Haas MJ, Onstead-Haas L, Kurban W, Shah H, Plazarte M, Chamseddin A, Mooradian AD. High-Throughput Analysis Identifying Drugs That Regulate Apolipoprotein A-I Synthesis. Assay Drug Dev Technol 2017; 15:362-371. [DOI: 10.1089/adt.2017.782] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Michael J. Haas
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| | - Luisa Onstead-Haas
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| | - William Kurban
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| | - Harshit Shah
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| | - Monica Plazarte
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| | - Ayham Chamseddin
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| | - Arshag D. Mooradian
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Florida College of Medicine—Jacksonville, Jacksonville, Florida
| |
Collapse
|
4
|
Satoh M, Ishige T, Ogawa S, Nishimura M, Matsushita K, Higashi T, Nomura F. Development and validation of the simultaneous measurement of four vitamin D metabolites in serum by LC–MS/MS for clinical laboratory applications. Anal Bioanal Chem 2016; 408:7617-7627. [DOI: 10.1007/s00216-016-9821-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 07/06/2016] [Accepted: 07/21/2016] [Indexed: 11/30/2022]
|
5
|
Wehmeier K, Onstead-Haas LM, Wong NCW, Mooradian AD, Haas MJ. Pro-inflammatory signaling by 24,25-dihydroxyvitamin D3 in HepG2 cells. J Mol Endocrinol 2016; 57:87-96. [PMID: 27234962 DOI: 10.1530/jme-16-0009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 05/27/2016] [Indexed: 12/31/2022]
Abstract
The vitamin D metabolite 24,25-dihydroxyvitamin D3 (24, 25[OH]2D3) was shown to induce nongenomic signaling pathways in resting zone chondrocytes and other cells involved in bone remodeling. Recently, our laboratory demonstrated that 24,25-[OH]2D3 but not 25-hydroxyvitamin D3, suppresses apolipoprotein A-I (apo A-I) gene expression and high-density lipoprotein (HDL) secretion in hepatocytes. Since 24,25-[OH]2D3 has low affinity for the vitamin D receptor (VDR) and little is known with regard to how 24,25-[OH]2D3 modulates nongenomic signaling in hepatocytes, we investigated the capacity of 24,25-[OH]2D3 to activate various signaling pathways relevant to apo A-I synthesis in HepG2 cells. Treatment with 24,25-[OH]2D3 resulted in decreased peroxisome proliferator-activated receptor alpha (PPARα) expression and retinoid-X-receptor alpha (RXRα) expression. Similarly, treatment of hepatocytes with 50 nM 24,25-[OH]2D3 for 1-3 h induced PKCα activation as well as c-jun-N-terminal kinase 1 (JNK1) activity and extracellular-regulated kinase 1/2 (ERK1/2) activity. These changes in kinase activity correlated with changes in c-jun phosphorylation, an increase in AP-1-dependent transcriptional activity, as well as repression of apo A-I promoter activity. Furthermore, treatment with 24,25-[OH]2D3 increased IL-1β, IL-6, and IL-8 expression by HepG2 cells. These observations suggest that 24,25-[OH]2D3 elicits several novel rapid nongenomic-mediated pro-inflammatory protein kinases targeting AP1 activity, increasing pro-inflammatory cytokine expression, potentially impacting lipid metabolism and hepatic function.
Collapse
Affiliation(s)
- Kent Wehmeier
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| | - Luisa M Onstead-Haas
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| | - Norman C W Wong
- Department of MedicineBiochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, Canada
| | - Arshag D Mooradian
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| | - Michael J Haas
- Division of EndocrinologyDiabetes, and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, Florida, USA
| |
Collapse
|
6
|
Tavakoli F, Namakin K, Zardast M. Vitamin D Supplementation and High-Density Lipoprotein Cholesterol: A Study in Healthy School Children. IRANIAN JOURNAL OF PEDIATRICS 2016; 26:e3311. [PMID: 27713805 PMCID: PMC5045666 DOI: 10.5812/ijp.3311] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 02/20/2016] [Accepted: 03/12/2016] [Indexed: 02/07/2023]
Abstract
Background The high-density lipoprotein cholesterol (HDL-C) level has been shown to have a significant role in the prevention of cardiovascular diseases and atherosclerosis. Low vitamin D levels have been shown to be correlated with dyslipidemia, but limited data exist on indigenous children. Objectives We aimed to investigate the effect of vitamin D supplementation on HDL-C levels in school-aged Iranian children. Methods In this prospective controlled clinical trial, 47 healthy children (23 boys) aged 10 - 14 years, students of Birjand (Iran) elementary schools, were selected and randomly divided into two groups. The study group received a vitamin D supplement (1000 mg capsule) daily for one month, and placebo tablets were prescribed to the controls. Before and after the treatment course, the serum HDL-C and 25-hydroxy vitamin D levels of both groups were measured. The data were analyzed by SPSS, ver. 16, and Chi-square tests, Fisher’s exact test, paired-sample t-tests, and Pearson’s correlation were used, wherever appropriate. The significance level was set at P < 0.05. Results Forty children completed the study; their mean age was 11.5 ± 1.175 years. The mean serum levels of both HDL-C and vitamin D showed a significant rise following the treatment in the study group (P = 0.007 and P < 0.001, respectively), whereas both variables decreased slightly in the control group (P = 0.27). There was no statistically significant difference in the mean serum levels of HDL-C and vitamin D between the two groups after the intervention (P = 0.11 and P = 0.20, respectively). Conclusions Vitamin D supplements seem to have a positive impact on serum HDL-C levels and may be effective in reducing the risk of cardiovascular diseases in the long term.
Collapse
Affiliation(s)
- Fatemeh Tavakoli
- Department of Pediatrics, Atherosclerosis and Coronary Artery Research Center, Birjand University of Medical Sciences, Birjand, IR Iran
| | - Kokab Namakin
- Department of Pediatrics, Atherosclerosis and Coronary Artery Research Center, Birjand University of Medical Sciences, Birjand, IR Iran
- Corresponding author: Kokab Namakin, Department of Pediatrics, Atherosclerosis and Coronary Artery Research Centre, Birjand University of Medical Sciences, Birjand, IR Iran, E-mail:
| | - Mahmood Zardast
- Department of Pathology, School of Medicine, Birjand University of Medical Sciences, Birjand, IR Iran
| |
Collapse
|
7
|
Shah I, Petroczi A, Naughton DP. Exploring the role of vitamin D in type 1 diabetes, rheumatoid arthritis, and Alzheimer disease: new insights from accurate analysis of 10 forms. J Clin Endocrinol Metab 2014; 99:808-16. [PMID: 24423328 DOI: 10.1210/jc.2013-2872] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
CONTEXT AND OBJECTIVE A comprehensive liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay was developed to quantify 10 forms of vitamin D in sera from healthy adults and patients suffering from rheumatoid arthritis (RA), type 1 diabetes (T1-D), and Alzheimer disease (AD). DESIGN The rapid assay, validated according to US Food and Drug Administration guidelines with Chromsystems and DEQAS samples, was applied to 36 nonhealthy sera samples (41.7% male, age range of 14-95, mean = 54.00 ± 21.98 years), consisting of individuals with RA, T1-D, and AD (n = 12 each) and was compared to samples from 32 healthy individuals (50% male, age range of 19-90, mean = 58.83 ± 22.93 years). RESULTS The key findings are (1) the 23R,25-dihydroxyvitamin D3 form was quantified for the first time (healthy = 0.427 ± 0.633 nmol/L; combined disease = 0.395 ± 0.483 nmol/L), (2) the 3-epi-25-hydroxyvitamin D3 metabolite was found in all groups with significantly higher concentration in the diseased samples [healthy = 6.093 ± 6.711 nmol/L; combined disease = 22.433 ± 13.535 nmol/L, t(52.5) = -6.411; P < .001], (3) a significant difference was found for the active form (1α-25-dihydroxyvitamin D3) between health (0.027 ± 0.035 nmol/L) and disease (0.433 ± 0.870 nmol/L) [t(35.1) = -2.797, P = 0.008], and (4) there was no significant correlation between the total circulating and total active forms in either the disease or healthy group (r = -0.180 and -0.274, respectively, with no difference between the correlation coefficients, z = -0.389, P = .697). Receiver operating characteristic curve analysis showed good sensitivity and specificity for using the 3-epi-25-hydroxyvitamin D concentration to predict disease status (area under the curve = 0.880, P < .001). Discriminant function analysis using concentrations of 23R,25-dihydroxyvitamin D3, 25-hydroxyvitamin D2, and 3-epi-25-hydroxyvitamin D classified 94.4% (91.7% in cross-validation) of the cases correctly. CONCLUSIONS This study reveals significant differences between health and disease with epimers having the potential to relate to disease. The potential implications of the information gleaned from measuring all forms warrant application of more comprehensive assays for future clinical studies investigating the link between vitamin D and health.
Collapse
Affiliation(s)
- Iltaf Shah
- School of Life Sciences, Kingston University, London KT1 2EE, United Kingdom
| | | | | |
Collapse
|
8
|
Wright ORL, Hickman IJ, Petchey WG, Sullivan CM, Ong C, Rose FJ, Ng C, Prins JB, Whitehead JP, O'Moore-Sullivan TM. The effect of 25-hydroxyvitamin D on insulin sensitivity in obesity: is it mediated via adiponectin? Can J Physiol Pharmacol 2013; 91:496-501. [PMID: 23746304 DOI: 10.1139/cjpp-2012-0436] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
There has been substantial recent interest in using vitamin D to improve insulin sensitivity and preventing/delaying diabetes in those at risk. There is little consensus on the physiological mechanisms and whether the association is direct or indirect through enhanced production of insulin-sensitising chemicals, including adiponectin. We examined cross-sectional associations between serum 25-hydroxyvitamin D (25(OH)D) and insulin sensitivity (Matsuda index), parathyroid hormone (PTH), waist circumference, body mass index (BMI), triglycerides (TG), total and high molecular weight (HMW) adiponectin, HMW : total adiponectin ratio (HMW : total adiponectin), and total cholesterol : HDL cholesterol ratio (TC:HDL cholesterol) in 137 Caucasian adults of mean age 43.3 ± 8.3 years and BMI 38.8 ± 6.9 kg/m(2). Total adiponectin (standardised β = 0.446; p < 0.001), waist circumference (standardised β = -0.216; p < 0.05), BMI (standardised β = -0.212; p < 0.05), and age (standardised β = -0.298; p < 0.001) were independently associated with insulin sensitivity. Serum 25(OH)D (standardised β = 0.114; p = 0.164) was not associated with insulin sensitivity, total or HMW adiponectin, HMW : total adiponectin, or lipids. Our results provide the novel finding that 25(OH)D is not associated with HMW adiponectin or HMW : total adiponectin in nondiabetic, obese adults and support the lack of association between 25(OH)D and lipids noted by others in similar groups of patients.
Collapse
Affiliation(s)
- Olivia R L Wright
- Centre for Dietetics Research (C-DIET-R), School of Human Movement Studies, Connell Building, The University of Queensland, Brisbane, Queensland, Australia.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Haas MJ, Mooradian AD. What evidence is there for the role of vitamin D and apoA-1 in atheroprotection? ACTA ACUST UNITED AC 2012. [DOI: 10.2217/clp.12.25] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
10
|
Taskapan H. Is 24,25(OH)D level really high in dialysis patients with high FGF23 levels? Int Urol Nephrol 2012; 44:1135-44. [PMID: 22467088 DOI: 10.1007/s11255-012-0157-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 03/05/2012] [Indexed: 12/20/2022]
Abstract
Deficiency of 1,25-dihydroxyvitamin D [1,25(OH)(2)D] and excessive fibroblast growth factor (FGF23) are suggested to be associated with increased mortality in patients with chronic kidney disease (CKD). Generally, 24-hydroxylation has been considered the first step in the degradation pathway of 1,25(OH)(2)D and 25(OH)D. 24,25-dihydroxyvitamin D [24,25(OH)(2)D] was believed to be a degradation product, with no important biological effects. However, some data have accumulated showing that 24,25(OH)(2)D has biological effects on its own. Under conditions of eucalcemia, the synthesis of 24,25(OH)(2)D is increased, and the synthesis of 1,25(OH)(2)D is decreased. In patients with CKD, both high parathyroid hormone levels, which decrease the activity of enzyme CYP24A1 (24-hydroxylase), and high FGF23 levels, which increase the activity of enzyme CYP24A1, were often detected. However, information about 24,25(OH)(2)D levels in these patients is very limited. Whether compensatory changes in levels of FGF23 and 24,25(OH)(2)D in CKD patients are protective or harmful remain unknown issues. Therefore, more studies are needed to identify the nature of the interactions between these molecules and to fully elucidate their clinical significance.
Collapse
Affiliation(s)
- Hulya Taskapan
- Nephrology Department, Inonu University Medical Faculty, 4400 Malatya, Turkey.
| |
Collapse
|
11
|
Wang H, Xia N, Yang Y, Peng DQ. Influence of vitamin D supplementation on plasma lipid profiles: a meta-analysis of randomized controlled trials. Lipids Health Dis 2012; 11:42. [PMID: 22433171 PMCID: PMC3325888 DOI: 10.1186/1476-511x-11-42] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Accepted: 03/20/2012] [Indexed: 12/17/2022] Open
Abstract
Observational studies have shown that low serum levels of vitamin D have been associated with an atherogenic lipid profile. However, the intervention studies gave divergent results. We conducted a meta-analysis of randomized controlled trials that evaluated the effects of vitamin D supplementation on blood lipids. A systematic literature search was conducted via MEDLINE, Cochrane library, and EMBASE for randomized controlled clinical trials assessing the effects of vitamin D supplementation on lipids. The mean change in total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C) and triglycerides (TG) from baseline was treated as a continuous variable. In all, 12 clinical trials consisting of 1346 participants were included in the analysis. The pooled estimate of effect for vitamin D supplementation on LDL-C was 3.23 mg/dl (95% confidence interval, 0.55 to 5.90 mg/dl). No statistically significant effects for vitamin D supplementation were observed for TC, HDL-C and TG (differences in means were 1.52 mg/dl (-1.42 to 4.46 mg/dl), -0.14 mg/dl (-0.99 to 0.71 mg/dl) and -1.92 mg/dl (-7.72 to 3.88 mg/dl) respectively). The lipid modulating effects of vitamin D supplementation should be further investigated though large-scale, randomized trials with adequate doses which can effectively elevated the active form of vitamin D in plasma and with proper population which has hyperlipemia as an inclusion criterion.
Collapse
Affiliation(s)
- Hao Wang
- Department of Cardiology, the Second Xiangya Hospital, Central South University, Changsha, Hunan, People's Republic of China
| | | | | | | |
Collapse
|
12
|
Jaimungal S, Wehmeier K, Mooradian AD, Haas MJ. The emerging evidence for vitamin D-mediated regulation of apolipoprotein A-I synthesis. Nutr Res 2012; 31:805-12. [PMID: 22118750 DOI: 10.1016/j.nutres.2011.09.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 09/09/2011] [Accepted: 09/14/2011] [Indexed: 11/29/2022]
Abstract
Ischemic heart disease and cerebrovascular ischemia are leading causes of mortality in industrialized countries. The pathogenesis of these diseases involves the formation of atherosclerotic plaques with eventual rupture and superimposed thrombosis. This process is inhibited by high-density lipoprotein (HDL), the main protein component of which is apolipoprotein A-I (apo A-I). Vitamin D3 is a hormone produced by sun-exposed skin but is acquired also in the diet. The Framingham Offspring Study and the Third National Health and Nutritional Examination Survey showed a link between vitamin D3 intake and cardiovascular risk factors. The link between 25-hydroxyvitamin D3 and HDL cholesterol (HDLc) and apo A-I is not as clear. Studies in vitamin D receptor knockout mice demonstrated higher HDLc and hepatic apo A-I messenger RNA expression relative to wild type. Experiments in cultured hepatocytes supported these observations. Human studies evaluating the relationship between vitamin D3 and apo A-I and HDLc have yielded conflicting results, but most suggest a positive link between increasing vitamin D3 levels and plasma apo A-I and HDLc. The purpose of this review is to examine the evidence linking vitamin D status and cardiovascular disease, to determine if there is a relationship between vitamin D levels and development of an atherogenic lipid profile. Our objectives are to determine if plasma vitamin D levels correlate with plasma HDLc and apo A-I and, if so, offer speculation as to how apo A-I in the context of high vitamin D levels provides enhanced atheroprotection.
Collapse
Affiliation(s)
- Sarada Jaimungal
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Florida–Jacksonville College of Medicine, Jacksonville, FL 32209, USA
| | | | | | | |
Collapse
|
13
|
Crooke RM, Graham MJ. Therapeutic potential of antisense oligonucleotides for the management of dyslipidemia. ACTA ACUST UNITED AC 2011. [DOI: 10.2217/clp.11.59] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|