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Li L, Han B, Kong Y, Zhang G, Zhang Z. Vitamin D binding protein in psychiatric and neurological disorders: Implications for diagnosis and treatment. Genes Dis 2024; 11:101309. [PMID: 38983447 PMCID: PMC11231549 DOI: 10.1016/j.gendis.2024.101309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 01/31/2024] [Accepted: 03/07/2024] [Indexed: 07/11/2024] Open
Abstract
Vitamin D binding protein (VDBP) serves as a key transporter protein responsible for binding and delivering vitamin D and its metabolites to target organs. VDBP plays a crucial part in the inflammatory reaction following tissue damage and is engaged in actin degradation. Recent research has shed light on its potential role in various diseases, leading to a growing interest in understanding the implications of VDBP in psychiatric and neurological disorders. The purpose of this review was to provide a summary of the existing understanding regarding the involvement of VDBP in neurological and psychiatric disorders. By examining the intricate interplay between VDBP and these disorders, this review contributes to a deeper understanding of underlying mechanisms and potential therapeutic avenues. Insights gained from the study of VDBP could pave the way for novel strategies in the diagnosis, prognosis, and treatment of psychiatric and neurological disorders.
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Affiliation(s)
- Ling Li
- Research Institution of Neuropsychiatry, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
- Department of Neurology, Affiliated Zhongda Hospital, Nanjing, Jiangsu 210009, China
| | - Bing Han
- Department of Pharmacology, Jiangsu Provincial Key Laboratory of Critical Care Medicine, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
| | - Yan Kong
- Department of Biochemistry and Molecular Biology, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
| | - Gaojia Zhang
- Research Institution of Neuropsychiatry, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
| | - Zhijun Zhang
- Research Institution of Neuropsychiatry, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
- Department of Neurology, Affiliated Zhongda Hospital, Nanjing, Jiangsu 210009, China
- Brain Cognition and Brain Disease Institute, Department of Mental Health and Public Health, Faculty of Life and Health Sciences, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
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Bolognesi E, Guerini FR, Sotgiu S, Chiappedi M, Carta A, Mensi MM, Agliardi C, Zanzottera M, Clerici M. GC1f Vitamin D Binding Protein Isoform as a Marker of Severity in Autism Spectrum Disorders. Nutrients 2022; 14:nu14235153. [PMID: 36501185 PMCID: PMC9740250 DOI: 10.3390/nu14235153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 11/25/2022] [Accepted: 11/30/2022] [Indexed: 12/09/2022] Open
Abstract
Autism spectrum disorders (ASD) are characterized by a wide spectrum of clinical, behavioral, and cognitive manifestations. It is, therefore, crucial to investigate possible biomarkers associated with specific ASD phenotypes. Ample literature suggests a possible role for vitamin D (VD) in influencing ASD clinical phenotypes. We analyzed three vitamin D binding protein gene (DBP) functional polymorphisms (rs2282679, rs7041, and rs4588), which are involved in the modulation of vitamin D serum concentration in 309 ASD children and 831 healthy controls. Frequency comparisons of single nucleotide polymorphisms (SNPs) alleles, genotypes, and GC isoforms (GC1f, G1s, and GC2)—generated by the combination of rs7041 and rs4588 alleles—were correlated with ASD diagnostic, behavioral, and functioning scales. The GC1f isoform was significantly more frequent in ASD compared with controls (18.6% vs. 14.5% pc = 0.02). Significantly higher scores for item 15 of the Childhood Autism Rating Scale (CARS) and lower ones for the Children’s Global Assessment Scale (CGAS) functioning scales were seen in ASD carrying the GC1f isoform. In GC phenotype analysis, a gradient of severity for overall CARS scores and CARS item 15 was observed, with scores decreasing according to the presence of GC1f-GC1f > GC1f-GC1s > GC1s-GC1s > GC1f-GC2 > GC2-GC2 isoforms. Similarly, lower CGAS scores were seen in carriers of the GC1f-GC1f isoform, whereas higher scores were present in those carrying GC2-GC2 (p = 0.028). This is the first study to evaluate possible relationships between GC variants and the different aspects of ASD in Italian ASD children. Results, although needing to be validated in ampler cohorts, suggest that the GC1f isoform could be a marker of severity in ASD that may be useful in establishing the intensity of therapeutic and rehabilitative protocols.
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Affiliation(s)
| | - Franca Rosa Guerini
- IRCCS Fondazione Don Carlo Gnocchi ONLUS, 20148 Milan, Italy
- Correspondence: ; Tel.: +39-02-4030-8342; Fax: +39-02-4030-8438
| | - Stefano Sotgiu
- Unit of Child Neuropsychiatry, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
| | - Matteo Chiappedi
- Child Neuropsychiatry Unit, IRCCS Mondino Foundation, 27100 Pavia, Italy
| | - Alessandra Carta
- Unit of Child Neuropsychiatry, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
| | | | | | | | - Mario Clerici
- IRCCS Fondazione Don Carlo Gnocchi ONLUS, 20148 Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
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Setayesh L, Amini A, Bagheri R, Moradi N, Yarizadeh H, Asbaghi O, Casazza K, Yekaninejad MS, Wong A, Suzuki K, Mirzaei K. Elevated Plasma Concentrations of Vitamin D-Binding Protein Are Associated with Lower High-Density Lipoprotein and Higher Fat Mass Index in Overweight and Obese Women. Nutrients 2021; 13:nu13093223. [PMID: 34579103 PMCID: PMC8472481 DOI: 10.3390/nu13093223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/08/2021] [Accepted: 09/15/2021] [Indexed: 12/17/2022] Open
Abstract
(1) Background: Observational studies have established that vitamin D-binding protein (DBP) and 25-hydroxyvitamin D3 (25(OH)D) concentrations are the major factors affecting the bioavailability of 25(OH)D. It has also been shown that poor 25(OH)D bioavailability elevates the risk of obesity and its related cardio-metabolic disorders. However, the relationship between 25(OH)D and DBP concentrations with cardio-metabolic risk factors in overweight and obese cohorts has not been established. Consequently, we evaluated the association between DBP and 25(OH)D concentrations with lipid profile, blood pressure (BP), and body composition in overweight and obese women. (2) Methods: In this cross-sectional study of 236 overweight and obese women, DBP and 25(OH)D concentrations were measured using an enzyme-linked immunosorbent assay. Body composition was assessed via bioelectrical impedance analysis. Lipid profile and BP were assessed by an auto-analyzer and digital BP monitor, respectively. The associations were examined by multivariate logistic regression. (3) Results: The indicated showed an inverse relationship between DBP and high-density lipoprotein (HDL) (p = 0.010) concentrations (where individuals with higher DBP had lower HDL) which, after adjusting for possible cofounders, remained significant (p = 0.006). Moreover, DBP concentration was positively associated with fat mass index (FMI) after adjustment (p = 0.022). No significant relationships were observed among 25(OH)D and target variables. (4) Conclusions: In conclusion, lower concentrations of HDL and higher values of FMI are associated with higher concentrations of DBP in overweight and obese women. These findings present novel awareness regarding the association of DBP with some metabolic and body composition variables in overweight and obese women. However, a two-way causal relationship between DBP and target variables should be considered.
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Affiliation(s)
- Leila Setayesh
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran 1417613151, Iran; (L.S.); (H.Y.)
| | - Abbas Amini
- Department of Mechanical Engineering, Australian College of Kuwait, Safat 13015, Kuwait;
| | - Reza Bagheri
- Department of Exercise Physiology, University of Isfahan, Isfahan 8174673441, Iran;
| | - Nariman Moradi
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj 6617713446, Iran;
| | - Habib Yarizadeh
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran 1417613151, Iran; (L.S.); (H.Y.)
| | - Omid Asbaghi
- Cancer Research Center, Shahid Beheshti University of Medical Sciences, Tehran 1416753955, Iran;
| | - Krista Casazza
- Marieb College of Health and Human Services, Florida Gulf Coast University, Fort Myers, FL 33965, USA;
| | - Mir Saeed Yekaninejad
- Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran 1417613151, Iran;
| | - Alexei Wong
- Department of Health and Human Performance, Marymount University, Arlington, VA 22207, USA;
| | - Katsuhiko Suzuki
- Faculty of Sport Sciences, Waseda University, Tokyo 2-579-15, Japan
- Correspondence: (K.S.); (K.M.)
| | - Khadijeh Mirzaei
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran 1417613151, Iran; (L.S.); (H.Y.)
- Correspondence: (K.S.); (K.M.)
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Cho MC, Park KS, Shin JK, Lee SA, Cho IA, Jo HC, Kim SC, Choi WJ. Correlational analysis of bone health status and vitamin D-related biomarkers in women working in agriculture. Medicine (Baltimore) 2021; 100:e27071. [PMID: 34449504 PMCID: PMC8389890 DOI: 10.1097/md.0000000000027071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 08/03/2021] [Indexed: 01/09/2023] Open
Abstract
The purpose of this study was to investigate the status of bone health in women working in agriculture and analyze the associations between bone health and various vitamin D-related biomarkers.This observational study enrolled women working in agriculture (n = 210) and control occupations (n = 180). The concentration of serum total 25-hydroxy vitamin D [25(OH)D] was measured using the Elecsys Vitamin D Total Kit, and serum vitamin D-binding protein (VDBP) was measured by enzyme-linked immunosorbent assay. Along with albumin, 25(OH)D and VDBP were used to calculate the concentrations of bioavailable and free 25(OH)D. Bone mineral density (BMD) and T-score were measured at lumbar 1 to 4 and the femur neck using dual-energy X-ray absorptiometry. To identify factors affecting BMD, log-linear model and linear regression analysis were performed for statistical analysis.Agricultural women workers showed higher serum concentrations of bioavailable 25(OH)D (12.8 ± 3.7 vs 8.7 ± 5.1 ng/mL) and lower VDBP concentrations (201.8 ± 45.0 vs 216.0 ± 68.2 μg/mL) than control women. The association between these 2 vitamin D related-biomarkers and femur neck BMD were confirmed through univariable and multivariable linear model analysis. Although lumbar BMD did not differ between groups, the agricultural group displayed a lower femur BMD and a 4.3-fold increase in the risk of osteoporosis compared with the control group.Women working in agriculture showed lower femur BMD than the control group. Of the vitamin D-related biomarkers tested, bioavailable 25(OH)D and VDBP were associated with BMD. As bioavailable 25(OH)D levels are affected mainly by VDBP levels, VDBP may play a role in the lower femur neck BMD values observed in the agricultural group. Thus, the measurement of VDBP concentration might be considered a simple and non-invasive method for measuring bone health status.
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Affiliation(s)
- Min-Chul Cho
- Department of Laboratory Medicine, Gyeongsang National University College of Medicine and Gyeongsang National University Hospital, Republic of Korea
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
| | - Ki Soo Park
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
- Department of Preventive Medicine, Gyeongsang National University College of Medicine, Republic of Korea
| | - Jeong Kyu Shin
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
- Department of Obstetrics and Gynecology, Gyeongsang National University College of Medicine and Gyeongsang National University Hospital, Republic of Korea
| | - Soon Ae Lee
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
- Department of Obstetrics and Gynecology, Gyeongsang National University College of Medicine and Gyeongsang National University Hospital, Republic of Korea
| | - In Ae Cho
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
- Department of Obstetrics and Gynecology, Gyeongsang National University Hospital, Republic of Korea
| | - Hyen Chul Jo
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
- Department of Obstetrics and Gynecology, Gyeongsang National University Changwon Hospital, Republic of Korea
| | - Seung Chan Kim
- Biostatistics Cooperation Center, Gyeongsang National University Hospital, Jinju, Republic of Korea
| | - Won Jun Choi
- Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
- Department of Obstetrics and Gynecology, Gyeongsang National University College of Medicine and Gyeongsang National University Hospital, Republic of Korea
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Rivera-Paredez B, Hidalgo-Bravo A, León-Reyes G, Antuna-Puente B, Flores YN, Salmerón J, Velázquez-Cruz R. Association of GC Variants with Bone Mineral Density and Serum VDBP Concentrations in Mexican Population. Genes (Basel) 2021; 12:genes12081176. [PMID: 34440350 PMCID: PMC8391993 DOI: 10.3390/genes12081176] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/27/2021] [Accepted: 07/27/2021] [Indexed: 01/08/2023] Open
Abstract
Vitamin D-binding protein (VDBP) is encoded by the GC gene and is an active participant in the control of bone metabolism. However, the effect of its major variants on VDBP concentration and bone mineral density (BMD) remains unclear. Our aim was to analyze the effect of major GC variants on serum VDBP concentration and BMD. We recruited individuals from the Health Workers Cohort Study, which includes employees of the Mexican Institute of Social Security (IMSS). A total of 1853 adults were included. The single nucleotide polymorphisms (SNPs) rs7041 and rs4588 were genotyped to identify the three best characterized haplotypes of GC. Serum VBDP, 25(OH)D and BMD were also measured. Among women, the G allele of rs7041 was associated with higher VDBP and BMD compared to homozygous TT. The A allele of rs4588 was associated with lower VDBP and BMD compared to CC homozygous. In men, GC variants were only associated with VDBP levels. We did not observe an association between free/bioavailable 25(OH)D and BMD in men and women. Our results support an association of VDBP in bone health. The G and C alleles, from rs7041 and rs4588, respectively, are associated with high concentrations of VDBP and BMD in this sample of Mexican postmenopausal women.
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Affiliation(s)
- Berenice Rivera-Paredez
- Research Center in Policies, Population and Health, School of Medicine, National Autonomous University of Mexico (UNAM), Mexico 04510, Mexico; (B.R.-P.); (J.S.)
| | - Alberto Hidalgo-Bravo
- Department of Genetics, National Institute of Rehabilitation (INR), Mexico 014389, Mexico;
| | - Guadalupe León-Reyes
- Genomics of Bone Metabolism Laboratory, National Institute of Genomic Medicine (INMEGEN), Mexico 14610, Mexico;
| | - Bárbara Antuna-Puente
- Laboratory of Genomics of Cardiovascular Diseases, National Institute of Genomic Medicine (INMEGEN), Mexico 14610, Mexico;
| | - Yvonne N. Flores
- Epidemiological and Health Services Research Unit, Morelos Delegation, Mexican Institute of Social Security, Cuernavaca, Morelos 62000, Mexico;
- University of California, Los Angeles (UCLA), Department of Health Policy and Management and UCLA-Kaiser Permanente Center for Health Equity, Fielding School of Public Health, Los Angeles, CA 90095, USA
- UCLA Center for Cancer Prevention and Control Research, Fielding School of Public Health and Jonsson Comprehensive Cancer Center, Los Angeles, CA 90095, USA
| | - Jorge Salmerón
- Research Center in Policies, Population and Health, School of Medicine, National Autonomous University of Mexico (UNAM), Mexico 04510, Mexico; (B.R.-P.); (J.S.)
| | - Rafael Velázquez-Cruz
- Genomics of Bone Metabolism Laboratory, National Institute of Genomic Medicine (INMEGEN), Mexico 14610, Mexico;
- Correspondence: ; Tel.: +52-(55)-5350-1900; Fax: +52-(55)-5350-1999
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De-la-O A, Jurado-Fasoli L, Castillo MJ, Gutiérrez Á, Amaro-Gahete FJ. Relationship of sedentary time, physical activity and fitness with 1,25-dihydroxyvitamin D in middle-aged sedentary adults: The FIT-AGEING study. Exp Gerontol 2021; 152:111458. [PMID: 34171393 DOI: 10.1016/j.exger.2021.111458] [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: 05/07/2021] [Accepted: 06/14/2021] [Indexed: 11/20/2022]
Abstract
PURPOSE Potential interactions between sedentary behaviour, physical activity (PA), and physical fitness with 25-hydroxyvitamin D (25(OH)D) status have been previously suggested. However, data are scarce concerning the association between these predictors of general health and the main active metabolite of vitamin D, the 1,25-dihidroxyvitamin D (1,25(OH)2D). This study aimed to analyse the relationship of sedentary time, PA levels, and physical fitness (i.e., maximal oxygen uptake (VO2max) and muscular strength) with 1,25(OH)2D in middle-aged sedentary adults. METHODS A total of 73 (39 women) middle-aged sedentary adults (53.7 ± 5.1 years old) participated in this cross-sectional study. Sedentary time and PA intensity levels were objectively measured with triaxial accelerometers for 7 consecutive days. VO2max was determined by a maximum treadmill test. Lower and upper limb muscular strength was assessed by an isokinetic strength test and by a handgrip strength test, respectively. 1,25(OH)2D plasma levels were measured using a DiaSorin Liaison® immunochemiluminometric assay. RESULTS No significant relationships were found between objectively measured sedentary time, PA levels or physical fitness (i.e., VO2max, extension and flexion peak torque, and hand grip strength) and 1,25(OH)2D (all P > 0.05). All results persisted after controlling for age, sex, fat mass or energy, vitamin D, calcium, and phosphorus intake. CONCLUSIONS In summary, our results show that vitamin D status is not affected by physical activity habits and sedentary behaviour in middle-aged sedentary adults.
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Affiliation(s)
- Alejandro De-la-O
- EFFECTS-262 Research Group, Department of Physiology, Faculty of Medicine, University of Granada, 18071 Granada, Spain.
| | - Lucas Jurado-Fasoli
- EFFECTS-262 Research Group, Department of Physiology, Faculty of Medicine, University of Granada, 18071 Granada, Spain; PROmoting FITness and Health Through Physical Activity (PROFITH) Research Group, Sport and Health University Research Institute, Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, 18071 Granada, Spain.
| | - Manuel J Castillo
- EFFECTS-262 Research Group, Department of Physiology, Faculty of Medicine, University of Granada, 18071 Granada, Spain.
| | - Ángel Gutiérrez
- EFFECTS-262 Research Group, Department of Physiology, Faculty of Medicine, University of Granada, 18071 Granada, Spain.
| | - Francisco J Amaro-Gahete
- EFFECTS-262 Research Group, Department of Physiology, Faculty of Medicine, University of Granada, 18071 Granada, Spain; PROmoting FITness and Health Through Physical Activity (PROFITH) Research Group, Sport and Health University Research Institute, Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, 18071 Granada, Spain.
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Surve S, Begum S, Joshi B, Khatkhatay MI, Kadam S, Chauhan S. Significance of Vitamin D Binding Protein in Assessing Vitamin D Status Among Under-Five Children. Indian J Clin Biochem 2020; 36:167-174. [PMID: 33867707 DOI: 10.1007/s12291-020-00873-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 01/22/2020] [Indexed: 10/25/2022]
Abstract
Despite ample sunshine, 50-90% Indian children have Vitamin D deficiency (VDD). This enigma of widespread VDD needs exploration especially among under-fives as physiological variations in Vitamin D Binding Protein (VDBP) levels could be potential confounders in the interpretation of total 25-hydroxyvitamin D [25(OH)D]. However, there is scarce information about relevance of VDBP levels in under-five age group. We therefore, explored association of VDBP levels among 1-5 year old children with VDD. Serum levels of 25(OH)D, VDBP, calcium, parathyroid hormone (PTH) and alkaline phosphatase were estimated in 210 apparently healthy children in the age group of 1-5 years. VDD was defined as serum 25(OH)D levels < 20 ng/ml as per the IOM classification. VDBP levels were classified as low if levels were < 168 μg/ml as per the kit. The prevalence of VDD was 79.5% (n = 167) and VDBP levels were low in 48.6% (n = 102) of children. 25(OH)D levels correlated positively with VDBP (r = 0.298, p = 0.0001). A significant number of children (52.7%) with VDD had low VDBP (p = 0.015). and despite adequate sun exposure, 43% of children showed VDD and 56.6% had low VDPB levels. The low VDBP levels largely explain low 25OHD levels without necessarily implying VDD. It may add a new dimension for better understanding of widespread VDD among under-five children. It thus, points towards the need for redefining cut offs and complete evaluation of vitamin D status among under-fives including VDBP.
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Affiliation(s)
- Suchitra Surve
- Department of Clinical Research, ICMR-National Institute for Research in Reproductive Health, Parel, Mumbai, Maharashtra 400012 India
| | - Shahina Begum
- Department of Bio-statistics, ICMR-National Institute for Research in Reproductive Health, Parel, Mumbai, India
| | - Beena Joshi
- Department of Operational Research, ICMR-National Institute for Research in Reproductive Health, Parel, India
| | - M Ikram Khatkhatay
- Department of Molecular Immunodiagnostics, ICMR-National Institute for Research in Reproductive Health, Parel, India
| | - Seema Kadam
- Department of Molecular Immunodiagnostics, ICMR-National Institute for Research in Reproductive Health, Parel, India
| | - Sanjay Chauhan
- Department of Clinical and Operational Research, ICMR-National Institute for Research in Reproductive Health, Parel, India
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Vitamin D binding protein is related to cardiac autonomic function and metabolic status in prediabetes. Nutr Res 2020; 75:56-66. [PMID: 31982803 DOI: 10.1016/j.nutres.2019.12.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/12/2019] [Accepted: 12/19/2019] [Indexed: 11/21/2022]
Abstract
A putative causal relationship between vitamin D status and glucose metabolism and a direct effect of vitamin D on cardiac autonomic function (CAF) have been suggested. We hypothesized that vitamin D binding protein (DBP), as a transporter of vitamin D, might also influence CAF and the overall metabolic risk. The present study aims to assess the relationship between DBP and CAF and metabolic status in a high-risk population with prediabetes. A total of 174 subjects (mean age 49.1±12.9 years, mean body mass index 30.2±6.2 kg/m2) were divided into 2 groups according to glucose tolerance: 48 with normal glucose tolerance and 126 with prediabetes. Glucose tolerance was assessed during oral glucose tolerance test, applying 2006 World Health Organization criteria. Fasting and postload glucose and immunoreactive insulin were measured (homeostatic model assessment of insulin resistance and homeostatic model assessment of β-cell function were calculated). Anthropometric indexes, blood pressure, hemoglobin A1c, creatinine, lipids, high-sensitivity C-reactive protein, total 25-hydroxyvitamin D, DBP (free 25-hydroxyvitamin D was calculated), and intact parathormone were measured. Body composition was estimated by impedance analysis (InBody 720), whereas tissue advanced glycation end products were assessed by skin autofluorescence (AGE Reader, DiagnOptics, the Netherlands). CAF was evaluated by АNX-3.0 system, applying standard autonomic tests. DBP was found to be elevated in women, as well as in the presence of cardiac autonomic dysfunction and metabolic syndrome. DBP was related to parasympathetic activity in both sexes and in prediabetes; to body fat in women and in prediabetes; and to age and high-density lipoprotein cholesterol in men. Vitamin D deficiency was established in 40.8% of the studied cohort. These results support the hypothesis that DBP is associated with CAF and some metabolic parameters in prediabetes.
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Serum Proteomic Analysis Reveals Vitamin D-Binding Protein (VDBP) as a Potential Biomarker for Low Bone Mineral Density in Mexican Postmenopausal Women. Nutrients 2019; 11:nu11122853. [PMID: 31766436 PMCID: PMC6950314 DOI: 10.3390/nu11122853] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/15/2019] [Accepted: 11/16/2019] [Indexed: 12/16/2022] Open
Abstract
Osteoporosis is a skeletal disease mainly affecting women over 50 years old and it represents a serious public health problem because of the high socioeconomic burden. This disease is characterized by deterioration of bone microarchitecture, low bone mineral density (BMD), and increased risk of fragility fractures. This study aimed to identify serum useful proteins as biomarkers for the diagnosis and/or prognosis of osteoporosis and fracture risk. We collected 446 serum samples from postmenopausal women aged ≥45 years old. Based on the BMD measurement, we classified the participants into three groups: osteoporotic, osteopenic, and normal. In an initial discovery stage, we conducted a proteomic approach using two-dimensional differential gel electrophoresis (2D-DIGE). The peptides into the spots of interest were identified through matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF/TOF). Enzyme-linked immunosorbent assay (ELISA) was performed to validate the proteins of interest. We identified 27 spots of interest when comparing low BMD versus normal BMD postmenopausal women. Based on their relevance in bone metabolism, we analyzed three proteins: ceruloplasmin (CP), gelsolin (GSN), and vitamin D-binding protein (VDBP). Our results demonstrated that low serum VDBP levels correlate with low BMD (osteopenic and osteoporotic). Therefore, VDBP could be considered as a novel, potential, and non-invasive biomarker for the early detection of osteoporosis.
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Khan AH, Fatima SS, Raheem A, Jafri L. Are serum leptin levels predicted by lipoproteins, vitamin D and body composition? World J Diabetes 2019; 10:260-268. [PMID: 31040902 PMCID: PMC6475708 DOI: 10.4239/wjd.v10.i4.260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 04/11/2019] [Accepted: 04/14/2019] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Both obesity and vitamin D deficiency are important health issues in Pakistan. The connection between body composition, Vitamin D and leptin in young adults is important to be studied as body composition may affect bone health and therefore the possibility of osteoporosis in later life. Few studies have attempted to investigate the effect of body composition and leptin with vitamin D in adolescence.
AIM To investigate the association of serum leptin with body composition, lipids and 25-hydroxyvitamin D (25OHD) in adults.
METHODS This cross-sectional study was conducted on 167 apparently healthy adults. Demographics were recorded, bioelectrical impedance analysis was performed and clinical history noted. Serum leptin was measured using DIA source kit on ELISA and total 25OHD was measured on ADVIA-Centaur; Siemens. Total cholesterol and high density lipoprotein cholesterol were quantified using Enzymatic Endpoint Method and Cholesterol Oxidase-Phenol Aminophenazone method respectively. Biochemical analysis was done in the Departments of Pathology and Laboratory Medicine and Biological and Biomedical Sciences, Aga Khan University Hospital Karachi Pakistan.
RESULTS Median age of the group (n = 167) was 20 years (IQR 27-20); 55.7% were females. Majority (89.2%, n = 149) of the study group was 25OHD deficient, 6% (n = 10) had insufficient serum 25OHD levels and 4.8% (n = 8) had sufficient D levels. Females, had higher median leptin levels [2.71 (IQR 4.76-1.66 ng/mL)] compared to their counterparts [1.3 (3.60-0.54 ng/mL), P < 0.01]. Multiple regression analysis suggested that basal metabolic rate, muscle mass, body fat percent, bone mass and serum 25OHD were the most contributing factors to serum leptin levels. Bone mass and serum 25OHD in fact bore a negative correlation with leptin.
CONCLUSION The results indicate that basal metabolic rate, muscle mass, body fat percent, bone mass and serum 25OHD have an impact on serum leptin. Being a cross sectional study causal relationship between leptin and other variables could not be determined.
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Affiliation(s)
- Aysha Habib Khan
- Departments of Pathology and Laboratory Medicine and Medicine, Aga Khan University, Karachi 74800, Pakistan
| | - Syeda Sadia Fatima
- Department of Basic Biomedical Sciences, Aga Khan University, Karachi 74800, Pakistan
| | - Ahmed Raheem
- Department of Pathology and Laboratory Medicine, Aga Khan University, Karachi 74800, Pakistan
| | - Lena Jafri
- Department of Pathology and Laboratory Medicine, Aga Khan University, Karachi 74800, Pakistan
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11
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Hyppönen E, Boucher BJ. Adiposity, vitamin D requirements, and clinical implications for obesity-related metabolic abnormalities. Nutr Rev 2018; 76:678-692. [DOI: 10.1093/nutrit/nuy034] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Elina Hyppönen
- Australian Centre for Population Health Research, Sansom Institute for Health Research, University of South Australia, South Australian Health & Medical Research Institute, Adelaide, Australia
| | - Barbara J Boucher
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
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12
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Naderpoor N, Shorakae S, Abell SK, Mousa A, Joham AE, Moran LJ, Stepto NK, Spritzer PM, Teede HJ, de Courten B. Bioavailable and free 25-hydroxyvitamin D and vitamin D binding protein in polycystic ovary syndrome: Relationships with obesity and insulin resistance. J Steroid Biochem Mol Biol 2018; 177:209-215. [PMID: 28734987 DOI: 10.1016/j.jsbmb.2017.07.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 07/10/2017] [Accepted: 07/15/2017] [Indexed: 01/01/2023]
Abstract
Polycystic ovary syndrome (PCOS) is a common condition characterised by both reproductive and metabolic features (obesity, insulin resistance, diabetes risk). Some evidence suggests that women with PCOS have lower vitamin D levels compared to healthy controls. Vitamin D binding protein (DBP) is the main carrier of vitamin D in circulation and plays an important role in regulating vitamin D concentration and bioavailability for target tissues. To our knowledge, no previous studies have examined DBP, bioavailable and free 25-hydroxyvitamin D (25(OH)D) in women with PCOS. The primary aim of this study was to compare DBP, bioavailable and free 25(OH)D concentrations in women with PCOS and controls. The secondary aim was to investigate relationships between DBP, bioavailable and free 25(OH)D and metabolic features (anthropometric measures, insulin resistance, and lipid profile). In a cross sectional study using bio-banked samples, we measured 25(OH)D, DBP and albumin. Bioavailable and free 25(OH)D were calculated using previously validated formula. BMI, body composition (dual X-ray absorptiometry, DXA), insulin resistance (homeostatic model assessment of insulin resistance (HOMA-IR)) and glucose infusion rate (GIR) from hyperinsulinaemic euglycaemic clamp and serum lipids (ELISA) were also measured in a physically and biochemically well-characterised cohort of women with and without PCOS. We studied 90 women with PCOS and 59 controls aged 18-48 years. DBP concentrations were lower in PCOS compared to controls (median [IQR]: 443.40 [314.4] vs 482.4 [156.8] μg/ml, p=0.02). No significant differences were found in bioavailable or free 25(OH)D concentrations between groups. DBP was not associated with BMI, percent body fat or markers of insulin resistance (all p>0.2). High-density lipoprotein (HDL) was the main determinant of DBP in the overall cohort (β=-0.12, p=0.02), after adjusting for covariates including PCOS/control status, age, BMI, total 25(OH)D and HOMA-IR. In PCOS, total and free 25(OH)D were related to markers of insulin resistance and lipids. Only the associations between free 25(OH)D and triglycerides (p=0.02), and HDL (p=0.03) remained significant after adjusting for age and BMI. In conclusion, women with PCOS had lower DBP, but similar bioavailable or free 25(OH)D concentrations compared to controls, independent of BMI and age. DBP was not associated with insulin resistance or BMI in PCOS. Further studies are needed to investigate the pathophysiology and clinical implications of reduced DBP in PCOS.
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Affiliation(s)
- Negar Naderpoor
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Diabetes and Vascular Medicine Unit, Monash Health, Melbourne, Australia
| | - Soulmaz Shorakae
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Diabetes and Vascular Medicine Unit, Monash Health, Melbourne, Australia
| | - Sally K Abell
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Diabetes and Vascular Medicine Unit, Monash Health, Melbourne, Australia
| | - Aya Mousa
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia
| | - Anju E Joham
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Diabetes and Vascular Medicine Unit, Monash Health, Melbourne, Australia
| | - Lisa J Moran
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia
| | - Nigel K Stepto
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia; Australian Institute for Musculoskeletal Science (AIMSS), Victoria University, Sunshine Hospital, St Albans, Australia
| | - Poli Mara Spritzer
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clinicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Helena J Teede
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Diabetes and Vascular Medicine Unit, Monash Health, Melbourne, Australia
| | - Barbora de Courten
- Monash Centre for Health Research and Implementation, School of Public health and Preventive Medicine, Monash University, Melbourne, Australia; Diabetes and Vascular Medicine Unit, Monash Health, Melbourne, Australia.
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13
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Saarnio E, Pekkinen M, Itkonen ST, Kemi V, Karp H, Ivaska KK, Risteli J, Koivula MK, Kärkkäinen M, Mäkitie O, Sievänen H, Lamberg-Allardt C. Low free 25-hydroxyvitamin D and high vitamin D binding protein and parathyroid hormone in obese Caucasians. A complex association with bone? PLoS One 2018; 13:e0192596. [PMID: 29489840 PMCID: PMC5831036 DOI: 10.1371/journal.pone.0192596] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 01/28/2018] [Indexed: 12/16/2022] Open
Abstract
Background Studies have shown altered vitamin D metabolism in obesity. We assessed differences between obese and normal-weight subjects in total, free, and bioavailable 25-hydroxyvitamin D (25(OH)D, 25(OH)DFree, and 25(OH)DBio, respectively), vitamin D binding protein (DBP), parathyroid hormone (PTH) and bone traits. Methods 595 37-47-year-old healthy Finnish men and women stratified by BMI were examined in this cross-sectional study. Background characteristic and intakes of vitamin D and calcium were collected. The concentrations of 25(OH)D, PTH, DBP, albumin and bone turnover markers were determined from blood. 25(OH)DFree and 25(OH)DBio were calculated. pQCT was performed at radius and tibia. Results Mean±SE (ANCOVA) 25(OH)DFree (10.8±0.6 vs 12.9±0.4 nmol/L; P = 0.008) and 25(OH)DBio (4.1±0.3 vs 5.1±0.1 nmol/L; P = 0.003) were lower in obese than in normal-weight women. In men, 25(OH)D (48.0±2.4 vs 56.4±2.0 nmol/L, P = 0.003), 25(OH)DFree (10.3±0.7 vs 12.5±0.6 pmol/L; P = 0.044) and 25(OH)DBio (4.2±0.3 vs 5.1±0.2 nmol/L; P = 0.032) were lower in obese. Similarly in all subjects, 25(OH)D, 25(OH)DFree and 25(OH)DBio were lower in obese (P<0.001). DBP (399±12 vs 356±7mg/L, P = 0.008) and PTH (62.2±3.0 vs 53.3±1.9 ng/L; P = 0.045) were higher in obese than in normal-weight women. In all subjects, PTH and DBP were higher in obese (P = 0.047and P = 0.004, respectively). In obese women, 25(OH)D was negatively associated with distal radius trabecular density (R2 = 0.089, P = 0.009) and tibial shaft cortical strength index (CSI) (R2 = 0.146, P = 0.004). 25(OH)DFree was negatively associated with distal radius CSI (R2 = 0.070, P = 0.049), radial shaft cortical density (CorD) (R2 = 0.050, P = 0.045), and tibial shaft CSI (R2 = 0.113, P = 0.012). 25(OH)DBio was negatively associated with distal radius CSI (R2 = 0.072, P = 0.045), radial shaft CorD (R2 = 0.059, P = 0.032), and tibial shaft CSI (R2 = 0.093, P = 0.024). Conclusions The associations between BMI and 25(OH)D, 25(OH)DFree, and 25(OH)DBio, DBP, and PTH suggest that obese subjects may differ from normal-weight subjects in vitamin D metabolism. BMI associated positively with trabecular bone traits and CSI in our study, and slightly negatively with cortical bone traits. Surprisingly, there was a negative association of free and bioavailable 25(OH)D and some of the bone traits in obese women.
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Affiliation(s)
- Elisa Saarnio
- Calcium Research Unit, Department of Food and Nutrition, University of Helsinki, Helsinki, Finland
| | - Minna Pekkinen
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Children's Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Suvi T Itkonen
- Calcium Research Unit, Department of Food and Nutrition, University of Helsinki, Helsinki, Finland
| | - Virpi Kemi
- Calcium Research Unit, Department of Food and Nutrition, University of Helsinki, Helsinki, Finland
| | - Heini Karp
- Calcium Research Unit, Department of Food and Nutrition, University of Helsinki, Helsinki, Finland
| | - Kaisa K Ivaska
- Department of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Turku, Finland
| | - Juha Risteli
- Department of Clinical Chemistry, University of Oulu, Oulu, Finland
- Northern Finland Laboratory Centre Nordlab, Oulu, Finland
- Medical Research Center, Oulu, Finland
| | - Marja-Kaisa Koivula
- Department of Clinical Chemistry, University of Oulu, Oulu, Finland
- Northern Finland Laboratory Centre Nordlab, Oulu, Finland
- Medical Research Center, Oulu, Finland
- Tykslab, the Hospital District of Southwest Finland, Turku, Finland
- Department of Clinical Chemistry, University Hospital Turku, Turku, Finland
| | - Merja Kärkkäinen
- Calcium Research Unit, Department of Food and Nutrition, University of Helsinki, Helsinki, Finland
| | - Outi Mäkitie
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Children's Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Harri Sievänen
- The UKK Institute for Health Promotion Research, Tampere, Finland
| | - Christel Lamberg-Allardt
- Calcium Research Unit, Department of Food and Nutrition, University of Helsinki, Helsinki, Finland
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14
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Pelczyńska M, Grzelak T, Sperling M, Bogdański P, Pupek-Musialik D, Czyżewska K. Impact of 25-hydroxyvitamin D, free and bioavailable fractions of vitamin D, and vitamin D binding protein levels on metabolic syndrome components. Arch Med Sci 2017; 13:745-752. [PMID: 28721141 PMCID: PMC5510509 DOI: 10.5114/aoms.2016.58594] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 12/12/2015] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION Various forms of vitamin D and factors involved in their metabolism can play a role in the etiopathogenesis of metabolic disorders. This paper aims to define the relationship between concentration of the hydroxylated form of vitamin D (25(OH)D), the fraction of free and bioavailable vitamin D, and of vitamin D binding protein (VDBP) levels on the one hand and the prevalence of metabolic syndrome components on the other. MATERIAL AND METHODS The studies were conducted on 79 people, including 52 with metabolic syndrome (MetS+) and 27 without it (MetS-). Biochemical measurements (lipid profile, glycemia, 25(OH)D, VDBP, albumin, calcium, parathyroid hormone) were performed, concentration of free and bioavailable vitamin D was mathematically calculated, and anthropometric and blood pressure measurements were taken. RESULTS The mean ± SD concentration of 25(OH)D among MetS+ individuals (41.90 ±13.12 nmol/l) was lower (p < 0.0001) than among the MetS- group (66.09 ±18.02 nmol/l). Differences between groups were observed in relation to medians/means of concentrations of free and bioavailable vitamin D (p < 0.0001) but not in the case of VDBP. In the entire study population, 25(OH)D correlated with all metabolic syndrome components, whereas its free and bioavailable fraction correlated with particular components of the syndrome. In the MetS+ group, VDBP concentration negatively correlated with body mass index (p = 0.037) and levels of diastolic pressure (p = 0.022). In the case of the MetS- group, the free fraction of vitamin D negatively correlated with triglyceridemia (p = 0.049). CONCLUSIONS The evaluation of various forms of vitamin D and VDBP in different population groups seems to have significant clinical value in evaluating the prevalence of metabolic disorders.
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Affiliation(s)
- Marta Pelczyńska
- Division of Biology of Civilization-Linked Diseases, Department of Chemistry and Clinical Biochemistry, Poznan University of Medical Sciences, Poznan, Poland
| | - Teresa Grzelak
- Division of Biology of Civilization-Linked Diseases, Department of Chemistry and Clinical Biochemistry, Poznan University of Medical Sciences, Poznan, Poland
| | - Marcelina Sperling
- Division of Biology of Civilization-Linked Diseases, Department of Chemistry and Clinical Biochemistry, Poznan University of Medical Sciences, Poznan, Poland
| | - Paweł Bogdański
- Department of Education and Obesity Treatment and Metabolic Disorders, Poznan University of Medical Sciences, Poznan, Poland
| | - Danuta Pupek-Musialik
- Department of Internal Medicine, Metabolic Disorders and Hypertension, Poznan University of Medical Sciences, Poznan, Poland
| | - Krystyna Czyżewska
- Division of Biology of Civilization-Linked Diseases, Department of Chemistry and Clinical Biochemistry, Poznan University of Medical Sciences, Poznan, Poland
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15
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Wang H, Chen W, Li D, Yin X, Zhang X, Olsen N, Zheng SG. Vitamin D and Chronic Diseases. Aging Dis 2017; 8:346-353. [PMID: 28580189 PMCID: PMC5440113 DOI: 10.14336/ad.2016.1021] [Citation(s) in RCA: 217] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 10/21/2016] [Indexed: 12/31/2022] Open
Abstract
Vitamin D is one of the essential nutrients to sustain the human health. As a member of the steroid hormone family, it has a classic role in regulating metabolism of calcium and a non-classic role in affecting cell proliferation and differentiation. Epidemiological studies have shown that 25OHD deficiency is closely associated with common chronic diseases such as bone metabolic disorders, tumors, cardiovascular diseases, and diabetes. 25OHD deficiency is also a risk factor for neuropsychiatric disorders and autoimmune diseases. 25OHD deficiency is highly prevalent in the world. It is therefore necessary to know the adverse health effects of 25OHD deficiency, and to design interventions and early treatments for those who are likely to have low levels of 25OHD.
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Affiliation(s)
- Hanmin Wang
- 1Division of Endocrinology, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China.,2Expert Workstation, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China
| | - Weiwen Chen
- 1Division of Endocrinology, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China.,2Expert Workstation, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China
| | - Dongqing Li
- 1Division of Endocrinology, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China.,2Expert Workstation, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China
| | - Xiaoe Yin
- 1Division of Endocrinology, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China.,2Expert Workstation, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China
| | - Xiaode Zhang
- 2Expert Workstation, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China
| | - Nancy Olsen
- 3Division of Rheumatology, Milton S Hershey Medical Center at Penn State University, Hershey, PA17033, USA
| | - Song Guo Zheng
- 2Expert Workstation, Quqing First Hospital at Kunming Medical University, Qujing, Yunan 655400, China.,3Division of Rheumatology, Milton S Hershey Medical Center at Penn State University, Hershey, PA17033, USA
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16
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Santos BR, Lecke SB, Spritzer PM. Genetic variant in vitamin D-binding protein is associated with metabolic syndrome and lower 25-hydroxyvitamin D levels in polycystic ovary syndrome: A cross-sectional study. PLoS One 2017; 12:e0173695. [PMID: 28278285 PMCID: PMC5344505 DOI: 10.1371/journal.pone.0173695] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 02/26/2017] [Indexed: 12/22/2022] Open
Abstract
Vitamin D deficiency has been related to metabolic syndrome (MetS) in polycystic ovary syndrome (PCOS). The vitamin D-binding protein (DBP) is the main protein involved in vitamin D transport. Two single-nucleotide polymorphisms (SNPs) of the DBP gene, rs4588 and rs7041, have been associated with low circulating levels of 25-hydroxyvitamin D [25(OH)D] in various populations, but not in women with PCOS. Therefore, we determined the genotype and haplotype distribution of DBP gene polymorphisms and investigated the associations between these genetic variants and their haplotypes with PCOS, MetS, and 25(OH)D levels in women with PCOS and controls from the South of Brazil. The sample included 291 women (191 with PCOS and 100 controls). All participants were genotyped for polymorphisms rs2282679, rs4588, and rs7041. Serum 25(OH)D levels were determined in a subset of 102 participants. Women with PCOS were younger and had significantly higher body mass index, blood pressure, and insulin resistance than the control group (p<0.05). The prevalence of MetS in PCOS and controls was 26.5% and 4.8% respectively. Levels of 25(OH)D were lower in PCOS women with MetS, even after adjustment for age (p = 0.033). No associations were observed between PCOS and the polymorphisms or their haplotypes. A higher frequency of genotype TT of rs7041 was found in PCOS participants with MetS (OR: 2.21, 95%CI:1.08–4.52; p = 0.027). This same genotype was associated with lower 25(OH)D levels in both PCOS and control women (OR: 4.40, 95%CI:1.62–12.00; p = 0.002). In conclusion, these findings indicate that DBP gene polymorphisms and their haplotypes are not directly associated with PCOS. In contrast, the TT genotype of SNP rs7041 was associated with MetS in PCOS women, and with lower 25(OH)D levels in both PCOS and control groups.
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Affiliation(s)
- Betânia Rodrigues Santos
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Laboratory of Molecular Endocrinology, Department of Physiology, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Sheila Bünecker Lecke
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Department of Diagnostic Methods, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Poli Mara Spritzer
- Gynecological Endocrinology Unit, Division of Endocrinology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Laboratory of Molecular Endocrinology, Department of Physiology, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
- * E-mail:
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17
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Wong TH, Gupta ED, Radhakrishnan AK, Gun SC, Chembalingam G, Yeap SS. Effects of 25-hydroxyvitamin D and vitamin D-binding protein on bone mineral density and disease activity in Malaysian patients with rheumatoid arthritis. Int J Rheum Dis 2017; 21:992-1000. [DOI: 10.1111/1756-185x.13048] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Tze Hao Wong
- Pathology Division; School of Medicine; International Medical University; Kuala Lumpur Malaysia
| | - Esha Das Gupta
- Internal Medicine Department; School of Medicine; International Medical University; Seremban Malaysia
| | - Ammu K. Radhakrishnan
- Pathology Division; School of Medicine; International Medical University; Kuala Lumpur Malaysia
| | - Suk Chyn Gun
- Internal Medicine Department; Hospital Tuanku Jaafar; Seremban Malaysia
| | | | - Swan Sim Yeap
- Department of Medicine; Subang Jaya Medical Centre; Subang Jaya Malaysia
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18
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Hajimohammadi M, Shab-Bidar S, Neyestani TR. Vitamin D and serum leptin: a systematic review and meta-analysis of observational studies and randomized controlled trials. Eur J Clin Nutr 2016; 71:1144-1153. [DOI: 10.1038/ejcn.2016.245] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 09/23/2016] [Accepted: 09/26/2016] [Indexed: 12/20/2022]
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19
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Bellavia D, Costa V, De Luca A, Maglio M, Pagani S, Fini M, Giavaresi G. Vitamin D Level Between Calcium-Phosphorus Homeostasis and Immune System: New Perspective in Osteoporosis. Curr Osteoporos Rep 2016:10.1007/s11914-016-0331-2. [PMID: 27734322 DOI: 10.1007/s11914-016-0331-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Vitamin D is a key molecule in calcium and phosphate homeostasis; however, increasing evidence has recently shown that it also plays a crucial role in the immune system, both innate and adaptive. A deregulation of vitamin D levels, due also to mutations and polymorphisms in the genes of the vitamin D pathway, determines severe alterations in the homeostasis of the organism, resulting in a higher risk of onset of some diseases, including osteoporosis. This review gives an overview of the influence of vitamin D levels on the pathogenesis of osteoporosis, between bone homeostasis and immune system.
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Affiliation(s)
- Daniele Bellavia
- Innovative Technology Platforms for Tissue Engineering, Theranostics and Oncology, Rizzoli Orthopaedic Institute, Via Divisi, 83, 90100, Palermo, Italy
| | - Viviana Costa
- Innovative Technology Platforms for Tissue Engineering, Theranostics and Oncology, Rizzoli Orthopaedic Institute, Via Divisi, 83, 90100, Palermo, Italy
| | - Angela De Luca
- Innovative Technology Platforms for Tissue Engineering, Theranostics and Oncology, Rizzoli Orthopaedic Institute, Via Divisi, 83, 90100, Palermo, Italy
| | - Melania Maglio
- Laboratory of Biocompatibility, Technological Innovations and Advanced Therapies, Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Stefania Pagani
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Milena Fini
- Laboratory of Biocompatibility, Technological Innovations and Advanced Therapies, Rizzoli Orthopaedic Institute, Bologna, Italy
| | - Gianluca Giavaresi
- Innovative Technology Platforms for Tissue Engineering, Theranostics and Oncology, Rizzoli Orthopaedic Institute, Via Divisi, 83, 90100, Palermo, Italy.
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20
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Holmlund-Suila E, Pekkinen M, Ivaska KK, Andersson S, Mäkitie O, Viljakainen H. Obese young adults exhibit lower total and lower free serum 25-hydroxycholecalciferol in a randomized vitamin D intervention. Clin Endocrinol (Oxf) 2016; 85:378-85. [PMID: 27146258 DOI: 10.1111/cen.13093] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 04/13/2016] [Accepted: 05/02/2016] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Although obesity is a risk factor for vitamin D insufficiency, its impact on vitamin D-binding protein (DBP) concentration, and thereby possibly also on free 25OHD, is less well known. Our aim was to compare total and free serum 25OHD, and DBP concentrations between obese and normal-weight young adults at baseline and their responses to cholecalciferol supplementation. DESIGN A 12-week randomized, double-blinded clinical trial. PATIENTS Obese subjects N = 18 (BMI = 38, 67% men) with severe childhood-onset obesity and 24 normal-weight subjects (BMI = 23, 46% men), age between 15 and 25 years, were randomized into two groups to receive either placebo or cholecalciferol 50 μg (2000 IU) daily. MEASUREMENTS At baseline, 6-week and 12-week blood samples and anthropometric measurements were collected; baseline body composition was assessed by dual-energy X-ray absorptiometry. RESULTS At baseline, obese subjects had, compared with normal-weight, lower total and free serum 25OHD (49 vs 62 nmol/l, P = 0·041; 2·8 vs 4·7 pg/ml, P = 0·001), without differences in DBP concentrations (309 vs 346 μg/ml, P = 0·212). Cholecalciferol 50 μg per day increased both total and free 25OHD (ancova P < 0·001 and P = 0·021). The response of total 25OHD to supplementation was inferior in the obese compared with normal-weight subjects (P = 0·027). On the contrary, the change in free 25OHD concentration was similar in groups (P = 0·487). CONCLUSIONS Obese young adults exhibit lower total and free 25OHD concentration, which is not directly explained by differences in DBP status. The response of free 25OHD to supplementation did not differ between obese and normal-weight subjects.
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Affiliation(s)
- Elisa Holmlund-Suila
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | | | - Kaisa K Ivaska
- Department of Cell Biology and Anatomy, Institute of Biomedicine, University of Turku, Turku, Finland
| | - Sture Andersson
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Outi Mäkitie
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Folkhälsan Research Centre, Helsinki, Finland
- Department of Molecular Medicine and Surgery, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden
| | - Heli Viljakainen
- Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Folkhälsan Research Centre, Helsinki, Finland
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21
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Walsh JS, Evans AL, Bowles S, Naylor KE, Jones KS, Schoenmakers I, Jacques RM, Eastell R. Free 25-hydroxyvitamin D is low in obesity, but there are no adverse associations with bone health. Am J Clin Nutr 2016; 103:1465-71. [PMID: 27169839 DOI: 10.3945/ajcn.115.120139] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 03/24/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The mechanism and clinical significance of low circulating 25-hydroxyvitamin D [25(OH)D] in obese people are unknown. Low total 25(OH)D may be due to low vitamin D-binding proteins (DBPs) or faster metabolic clearance. However, obese people have a higher bone mineral density (BMD), which suggests that low 25(OH)D may not be associated with adverse consequences for bone. OBJECTIVE We sought to determine whether 1) vitamin D metabolism and 2) its association with bone health differ by body weight. DESIGN We conducted a cross-sectional observational study of 223 normal-weight, overweight, and obese men and women aged 25-75 y in South Yorkshire, United Kingdom, in the fall and spring. A subgroup of 106 subjects was also assessed in the winter. We used novel techniques, including an immunoassay for free 25(OH)D, a stable isotope for the 25(OH)D3 half-life, and high-resolution quantitative tomography, to make a detailed assessment of vitamin D physiology and bone health. RESULTS Serum total 25(OH)D was lower in obese and overweight subjects than in normal-weight subjects in the fall and spring (geometric means: 45.0 and 40.8 compared with 58.6 nmol/L, respectively; P < 0.001) but not in the winter. Serum 25(OH)D was inversely correlated with body mass index (BMI) in the fall and spring and in the winter. Free 25(OH)D and 1,25-dihydroxyvitamin D [1,25(OH)2D] were lower in obese subjects. DBP, the DBP genotype, and the 25(OH)D3 half-life did not differ between BMI groups. Bone turnover was lower, and bone density was higher, in obese people. CONCLUSIONS Total and free 25(OH)D and 1,25(OH)2D are lower at higher BMI, which cannot be explained by lower DBP or the shorter half-life of 25(OH)D3 We speculate that low 25(OH)D in obesity is due to a greater pool of distribution. Lower 25(OH)D may not reflect at-risk skeletal health in obese people, and BMI should be considered when interpreting serum 25(OH)D as a marker of vitamin D status.
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Affiliation(s)
| | | | | | | | - Kerry S Jones
- Medical Research Council Human Nutrition Research, Cambridge, United Kingdom
| | - Inez Schoenmakers
- Medical Research Council Human Nutrition Research, Cambridge, United Kingdom
| | - Richard M Jacques
- School of Health and Related Research, University of Sheffield, United Kingdom; and
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22
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Sollid ST, Hutchinson MYS, Berg V, Fuskevåg OM, Figenschau Y, Thorsby PM, Jorde R. Effects of vitamin D binding protein phenotypes and vitamin D supplementation on serum total 25(OH)D and directly measured free 25(OH)D. Eur J Endocrinol 2016; 174:445-52. [PMID: 26733479 PMCID: PMC4763092 DOI: 10.1530/eje-15-1089] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 01/05/2016] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To determine the relationship between serum total 25-hydroxyvitamin D (25(OH)D), directly measured free 25(OH)D and calculated free 25(OH)D with regard to vitamin D-binding protein (DBP) phenotypes, sex, BMI, age and season, and their interrelationship to vitamin D supplementation. DESIGN, PATIENTS AND INTERVENTIONS A randomized controlled trial with 20 000 IU of vitamin D3 per week or placebo for 12 months was designed. A total of 472 subjects, 236 in each of the intervention groups, were included in the analyses. MAIN OUTCOME MEASURES Baseline serum concentrations and increases in serum total 25(OH)D, directly measured free 25(OH)D, calculated free 25(OH)D and DBP. RESULTS Serum total 25(OH)D and DBP concentrations were significantly lower in subjects with the phenotype Gc2/Gc2 compared to phenotypes with the Gc1S allele, and lower in males compared to females. When using directly measured free 25(OH)D, the differences related to DBP phenotypes and sexes were clearly diminished. All calculated free 25(OH)D concentrations were overestimated compared to the directly measured free 25(OH)D. Serum parathyroid hormone showed an inverse correlation with all vitamin D parameters analyzed. The increases after 12 months of vitamin D supplementation were not significantly different for any of the vitamin D parameters regardless of DBP phenotype, sex or age. Supplementation with vitamin D did not affect serum DBP. CONCLUSION Direct measurements of free 25(OH)D reduce the differences seen in total 25(OH)D between DBP phenotype groups and sexes, probably caused by differences in DBP concentrations. With conditions affecting serum DBP concentrations, direct measurements of free 25(OH)D should be considered.
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Affiliation(s)
- Stina T Sollid
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Moira Y S Hutchinson
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Vivian Berg
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Ole M Fuskevåg
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Yngve Figenschau
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Per M Thorsby
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Rolf Jorde
- Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway Tromsø Endocrine Research GroupDepartment of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, NorwayDivision of Internal MedicineUniversity Hospital of North Norway, 9038 Tromsø, NorwayDivision of Head and MotionDepartment of Rheumatology, Nordland Hospital, Bodø, NorwayDivision of Diagnostic ServicesUniversity Hospital of North Norway, Tromsø, NorwayDepartment of Medical BiologyUiT The Arctic University of Norway, Tromsø, NorwayHormone LaboratoryDepartment of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
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23
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Delanghe JR, Speeckaert R, Speeckaert MM. Behind the scenes of vitamin D binding protein: more than vitamin D binding. Best Pract Res Clin Endocrinol Metab 2015; 29:773-86. [PMID: 26522461 DOI: 10.1016/j.beem.2015.06.006] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Although being discovered in 1959, the number of published papers in recent years reveals that vitamin D binding protein (DBP), a member of the albuminoid superfamily, is a hot research topic. Besides the three major phenotypes (DBP1F, DBP1S and DBP2), more than 120 unique variants have been described of this polymorphic protein. The presence of DBP has been demonstrated in different body fluids (serum, urine, breast milk, ascitic fluid, cerebrospinal fluid, saliva and seminal fluid) and organs (brain, heart, lungs, kidneys, placenta, spleen, testes and uterus). Although the major function is binding, solubilization and transport of vitamin D and its metabolites, the name of this glycoprotein hides numerous other important biological functions. In this review, we will focus on the analytical aspects of the determination of DBP and discuss in detail the multifunctional capacity [actin scavenging, binding of fatty acids, chemotaxis, binding of endotoxins, influence on T cell response and influence of vitamin D binding protein-macrophage activating factor (DBP-MAF) on bone metabolism and cancer] of this abundant plasma protein.
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Affiliation(s)
- Joris R Delanghe
- Department of Clinical Chemistry, Ghent University Hospital, Ghent, Belgium
| | | | - Marijn M Speeckaert
- Department of Clinical Chemistry, Ghent University Hospital, Ghent, Belgium; Department of Nephrology, Ghent University Hospital, Ghent, Belgium
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24
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Ghoneim AH, Al-Azzawi MA, Elmasry SA, Nasr MY, AboZaid MM. Association of vitamin D status in the pathogenesis of chronic obstructive pulmonary disease. EGYPTIAN JOURNAL OF CHEST DISEASES AND TUBERCULOSIS 2015. [DOI: 10.1016/j.ejcdt.2015.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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25
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Behrens JR, Rasche L, Gieß RM, Pfuhl C, Wakonig K, Freitag E, Deuschle K, Bellmann-Strobl J, Paul F, Ruprecht K, Dörr J. Low 25-hydroxyvitamin D, but not the bioavailable fraction of 25-hydroxyvitamin D, is a risk factor for multiple sclerosis. Eur J Neurol 2015. [PMID: 26220765 DOI: 10.1111/ene.12788] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE Low 25-hydroxyvitamin D [25(OH)D] levels correlate with higher disease activity in patients with multiple sclerosis (MS). However, it is not clear whether low 25(OH)D levels directly contribute to increased disease activity or merely represent a consequence of reduced endogenous vitamin D synthesis in more disabled MS patients. Furthermore, recent data suggest that bioavailable vitamin D, which also integrates the levels of vitamin D binding proteins and albumin, could be a biologically more relevant parameter than 25(OH)D. METHODS Measured de-seasonalized 25(OH)D3 and vitamin D binding protein and calculated bioavailable and free vitamin D were compared in the baseline serum samples of 76 patients with clinically isolated syndrome enrolled in a longitudinal observational study and in 76 age- and sex-matched healthy controls (HC). RESULTS 25(OH)D3 levels were lower in patients with clinically isolated syndrome (P = 0.002) than in HC, and more patients (8/76, 10.5%) than HC (1/76, 1.3%) had 25(OH)D3 levels <25 nmol/l (P = 0.03). In contrast, levels of 25(OH)D2, vitamin D binding protein and calculated levels of free and bioavailable vitamin D did not differ between the two groups. CONCLUSIONS Lower 25(OH)D3 levels already in the earliest phase of disease and in clinically hardly affected patients suggest that low 25(OH)D3 levels are rather a risk factor for than a consequence of MS. Nevertheless, because bioavailable vitamin D levels did not differ between the two groups, the mechanism underlying the association of 25(OH)D3 and MS does not appear to be related to reduced bioavailability of vitamin D.
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Affiliation(s)
- Janina R Behrens
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Clinical and Experimental Multiple Sclerosis Research Center, Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Ludwig Rasche
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Rene M Gieß
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Catherina Pfuhl
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Katharina Wakonig
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Erik Freitag
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Katrin Deuschle
- Clinical and Experimental Multiple Sclerosis Research Center, Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Psychiatry, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Judith Bellmann-Strobl
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Clinical and Experimental Multiple Sclerosis Research Center, Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Experimental and Clinical Research Center, Max Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Friedemann Paul
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Clinical and Experimental Multiple Sclerosis Research Center, Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Experimental and Clinical Research Center, Max Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Klemens Ruprecht
- Clinical and Experimental Multiple Sclerosis Research Center, Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Jan Dörr
- NeuroCure Clinical Research Center, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Clinical and Experimental Multiple Sclerosis Research Center, Department of Neurology, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Experimental and Clinical Research Center, Max Delbrück Center for Molecular Medicine and Charité-Universitätsmedizin Berlin, Berlin, Germany
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26
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Pop LC, Shapses SA, Chang B, Sun W, Wang X. VITAMIN D-BINDING PROTEIN IN HEALTHY PRE- AND POSTMENOPAUSAL WOMEN: RELATIONSHIP WITH ESTRADIOL CONCENTRATIONS. Endocr Pract 2015; 21:936-42. [PMID: 26121448 DOI: 10.4158/ep15623.or] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE To examine the relationship between endogenous serum estradiol and vitamin D-binding protein (DBP) and total, free, and bioavailable 25-hydroxyvitamin D (25OHD) concentrations in pre- and postmenopausal women. METHODS In 165 healthy women (ages, 26 to 75 years) not taking any form of exogenous estrogen, the serum concentrations of estradiol, 25OHD, DBP, parathyroid hormone, and albumin were measured. Free and bioavailable 25OHD (free + albumin-bound) levels were calculated from total 25OHD, DBP, and serum albumin levels. RESULTS Premenopausal women had higher serum 25OHD (31.5 ± 7.9 ng/mL), DBP (45.3 ± 6.2 mg/dL), and estradiol (52.8 ± 35.0 pg/mL) levels than postmenopausal women (26.5 ± 4.9 ng/mL, 41.7 ± 5.7 mg/dL, and 12.9 ± 4.9 pg/mL), respectively. In addition, the calculated free and bioavailable 25OHD levels were higher in pre- than postmenopausal women (P<.05). Serum estradiol correlated with DBP (r = 0.22; P<.01) and total 25OHD (r = 0.27; P<.01). In multivariate regression models (with or without serum 25OHD), estradiol was independently associated with DBP (P<.05). CONCLUSION Lower estradiol level is one of the factors that contribute to lower DBP levels in older women. Our data indicate that besides well-known factors such as age, gender, and race, serum estradiol concentrations are also a physiologic predictor of DBP concentration.
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27
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Wilson RT, Bortner JD, Roff A, Das A, Battaglioli EJ, Richie JP, Barnholtz-Sloan J, Chinchilli VM, Berg A, Liu G, Salzberg AC, El-Bayoumy K. Genetic and environmental influences on plasma vitamin D binding protein concentrations. Transl Res 2015; 165:667-76. [PMID: 25234352 DOI: 10.1016/j.trsl.2014.08.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 08/15/2014] [Accepted: 08/18/2014] [Indexed: 11/17/2022]
Abstract
Recent studies suggest that low vitamin D-binding protein (VDBP aka group-specific complement or Gc) concentrations may be linked with inflammatory-mediated conditions, including asthma, chronic obstructive pulmonary disease, and cancer. However, these studies may be confounded by substantial racial and ethnic or genetic differences. The purpose of this study was to test the hypothesis that circulating VDBP concentrations are significantly associated with genetic ancestry. We used a validated high-performance liquid chromatography tandem mass spectrometry assay of 25-hydroxyvitamin D3 and its downstream metabolite 24,25-dihydroxyvitamin D3. VDBP concentrations (milligrams per liter) were measured in duplicate using a commercial enzyme-linked immunosorbent assay among healthy African American (n = 56) and Caucasian American (n = 60) participants. Ancestry informative markers across the genome were used to estimate individual genetic ancestry proportions, designed to robustly distinguish between West African and European ancestry. Genotype-defined Gc isoforms were defined using rs7041 and rs4588 combination groups. VDBP concentration was correlated with both Gc isoform (r = 0.93, P < 0.001) and West African genetic ancestry (r = -0.66, P < 0.001). In the final model, Gc isoform, the catabolic ratio of serum vitamin D, oral contraceptive use, and body mass index remained significantly associated with VDBP concentration, after adjustment for genetic ancestry. Failure to adjust for Gc isoform may lead to spurious associations in studies of VDBP concentration and disease risk, particularly when the condition of interest may also be associated with genetic ancestry. The higher circulating VDBP concentrations and higher vitamin D catabolic rate among Caucasian Americans observed here appear to be consistent with lower bone mineral density and racial and ethnic differences in vitamin D-inducing cytokines.
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Affiliation(s)
- Robin Taylor Wilson
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania.
| | - James D Bortner
- Perelman School of Medicine, University of Pennsylvania Philadelphia, Pennsylvania
| | - Alanna Roff
- Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Arunangshu Das
- Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Eric J Battaglioli
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - John P Richie
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Jill Barnholtz-Sloan
- Department of Epidemiology and Biostatistics, Center for Proteomics and Bioinformatics, Case Western Reserve University, Cleveland, Ohio
| | - Vernon M Chinchilli
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Arthur Berg
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Guodong Liu
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Anna C Salzberg
- Division of Epidemiology, Department of Public Health Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania
| | - Karam El-Bayoumy
- Perelman School of Medicine, University of Pennsylvania Philadelphia, Pennsylvania
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28
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Pekkinen M, Saarnio E, Viljakainen HT, Kokkonen E, Jakobsen J, Cashman K, Mäkitie O, Lamberg-Allardt C. Vitamin D binding protein genotype is associated with serum 25-hydroxyvitamin D and PTH concentrations, as well as bone health in children and adolescents in Finland. PLoS One 2014; 9:e87292. [PMID: 24498064 PMCID: PMC3907502 DOI: 10.1371/journal.pone.0087292] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 12/26/2013] [Indexed: 01/08/2023] Open
Abstract
Vitamin D binding protein (DBP)/group-specific component (Gc), correlates positively with serum vitamin D metabolites, and phenotype influences serum 25-hydroxyvitamin D (S-25(OH)D) concentration. The protein isoform has been associated with decreased bone mineral density (BMD) and increased fracture risk. We examined the role of GC genotypes in S-25(OH)D status and BMD in 231 Finnish children and adolescents aged 7-19 yr. BMD was measured with DXA from lumbar spine (LS), total hip, and whole body, and for 175 subjects, radial volumetric BMD was measured with pQCT. Background characteristic and total dietary intakes of vitamin D and calcium were collected. The concentrations of 25(OH)D, parathyroid hormone (PTH), calcium and other markers of calcium homeostasis were determined from blood and urine. Genotyping was based on single-nucleotide polymorphism (rs4588) in the GC gene. The genotype distribution was: GC 1/1 68%, GC 1/2 26% and GC 2/2 6%. A significant difference emerged in 25(OH)D and PTH concentrations between the genotypes, (p = 0.001 and 0.028 respectively, ANCOVA). There was also a linear trend in: Gc 2/2 had the lowest 25(OH)D and PTH concentrations (p = 0.025 and 0.012, respectively). Total hip bone mineral content was associated with GC genotype (BMC) (p = 0.05, ANCOVA) in boys. In regression analysis, after adjusting for relevant covariates, GC genotype was associated with LS BMC and strength and strain index (SSI) Z-score in both genders, and LS BMD in boys. In conclusion, the present study demonstrates the association between GC genotypes and S-25(OH)D and PTH concentrations. The results show the influence of DBP genetic variation on bone mass accrual in adolescence.
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Affiliation(s)
- Minna Pekkinen
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- * E-mail:
| | - Elisa Saarnio
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Heli T. Viljakainen
- Children’s Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
| | - Elina Kokkonen
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Jette Jakobsen
- Division of Nutrition, National Food Institute, Technical University of Denmark, Soborg, Denmark
| | - Kevin Cashman
- Department of Food and Nutritional Sciences, University College, Cork, Ireland
| | - Outi Mäkitie
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Helsinki, Finland
- Children’s Hospital, Helsinki University Central Hospital and University of Helsinki, Helsinki, Finland
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29
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Speeckaert MM, Speeckaert R, van Geel N, Delanghe JR. Vitamin D binding protein: a multifunctional protein of clinical importance. Adv Clin Chem 2014; 63:1-57. [PMID: 24783350 DOI: 10.1016/b978-0-12-800094-6.00001-7] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Since the discovery of group-specific component and its polymorphism by Hirschfeld in 1959, research has put spotlight on this multifunctional transport protein (vitamin D binding protein, DBP). Besides the transport of vitamin D metabolites, DBP is a plasma glycoprotein with many important functions, including sequestration of actin, modulation of immune and inflammatory responses, binding of fatty acids, and control of bone development. A considerable DBP polymorphism has been described with a specific allele distribution in different geographic area. Multiple studies have shed light on the interesting relationship between polymorphisms of the DBP gene and the susceptibility to diseases. In this review, we give an overview of the multifunctional character of DBP and describe the clinical importance of DBP and its polymorphisms. Finally, we discuss the possibilities to use DBP as a novel therapeutic agent.
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30
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Abstract
Vitamin D binding protein (DBP) is the major carrier protein of 25-hydroxyvitamin D (25(OH) D) in the circulation, where it may serve roles in maintaining stable levels during times of decreased 25(OH) availability and in regulating delivery of 25(OH) D to target tissues. Several genetic polymorphisms of DBP have been described that lead to phenotypic changes in the protein that may affect affinity, activity, and concentration. These polymorphisms have been linked with alterations in bone density in several populations. One of the mechanisms by which DBP may alter bone health involves regulating vitamin D bioavailability. DBP-bound vitamin is thought to be relatively unavailable to target tissues, and thus alterations in DBP levels or affinity could lead to changes in vitamin D bioactivity. As a result, functional vitamin D status may differ greatly between individuals with similar total 25(OH) D levels. Additionally, DBP may have independent roles on macrophage and osteoclast activation. This review will summarize recent findings about DBP with respect to measures of bone density and health.
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Affiliation(s)
- Ishir Bhan
- Massachusetts General Hospital, Harvard Medical School, 5 Suite 750, 50 Staniford Street, Boston, MA 02114, USA
- *Ishir Bhan:
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31
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Grimaldi AS, Parker BA, Capizzi JA, Clarkson PM, Pescatello LS, White MC, Thompson PD. 25(OH) vitamin D is associated with greater muscle strength in healthy men and women. Med Sci Sports Exerc 2013; 45:157-62. [PMID: 22895376 DOI: 10.1249/mss.0b013e31826c9a78] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
PURPOSE The purpose of the study was to examine the relation between serum 25-hydroxy vitamin D (25(OH)D) levels and muscle strength in 419 healthy men and women over a broad age range (20-76 yr). METHODS Isometric and isokinetic strength of the arms and legs was measured using computerized dynamometry, and its relation to vitamin D was tested in multivariate models controlling for age, gender, resting HR, systolic blood pressure, diastolic blood pressure, body mass index, maximal oxygen uptake (VO(2max)), physical activity counts, and season of vitamin D measurement. RESULTS Vitamin D was significantly associated with arm and leg muscle strength when controlling for age and gender. When controlling for other covariates listed previously, vitamin D remained directly related to both isometric and isokinetic arm strength but only to isometric leg strength. CONCLUSION These data suggest that there may be a differential effect of vitamin D on upper and lower body strength. The mechanism for this difference remains unclear but could be related to differences in androgenic effects or to differences in vitamin D receptor expression. Our study supports a direct relation between vitamin D and muscle strength and suggests that vitamin D supplementation be evaluated to determine whether it is an effective therapy to preserve muscle strength in adults.
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Affiliation(s)
- Adam S Grimaldi
- Division of Cardiology, Henry Low Heart Center, Hartford Hospital, Hartford, CT 06102, USA
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Association between the plasma proteome and serum ascorbic acid concentrations in humans. J Nutr Biochem 2013; 24:842-7. [DOI: 10.1016/j.jnutbio.2012.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 04/04/2012] [Accepted: 05/01/2012] [Indexed: 12/15/2022]
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Karlsson T, Osmancevic A, Jansson N, Hulthén L, Holmäng A, Larsson I. Increased vitamin D-binding protein and decreased free 25(OH)D in obese women of reproductive age. Eur J Nutr 2013; 53:259-67. [PMID: 23604494 DOI: 10.1007/s00394-013-0524-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 04/10/2013] [Indexed: 12/17/2022]
Abstract
PURPOSE Obese subjects have lower circulating 25-hydroxyvitamin D (25(OH)D) than normal-weight subjects. Knowledge is scarce regarding differences in vitamin D-binding protein (DBP), free 25(OH)D, and intake of vitamin D between normal-weight and obese subjects. The purpose of this study was to examine intake and vitamin D status in obese compared with normal-weight women. METHODS Between September 2009 and October 2011, 43 obese and 43 normal-weight women, 22-45 years of age, mean BMI of 39.1 ± 4.6 and 21.6 ± 1.8 kg/m(2), respectively, were recruited in the western Sweden region (latitude 57°N). Blood samples, data regarding diet, and sun exposure were collected. RESULTS DBP concentrations were 320 ± 121 and 266 ± 104 μg/mL (P = 0.02) in obese and normal-weight women, respectively. Calculated free 25(OH)D was 13.3 ± 5.5 (obese) and 23.7 ± 10.7 (normal-weight) (P < 0.001). The obese women had a 20.1 nmol/L lower mean 25(HO)D concentration compared to normal-weight women (P < 0.001). 56 % of obese women and 12 % of normal-weight women had 25(OH)D concentrations ≤50 nmol/L. There was no statistically significant difference in total vitamin D intake between the groups. 39 % of the women had a total vitamin D intake <7.5 μg/day, the current national recommendation for vitamin D in Sweden. CONCLUSIONS Obese women had higher DBP concentrations compared with normal-weight women and lower free 25(OH)D. The obese women were more likely to have 25(OH)D concentrations that could be considered suboptimal. Vitamin D intake was generally low in normal-weight and obese women of childbearing age.
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Affiliation(s)
- Therese Karlsson
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, P.O. Box 432, 405 30, Göteborg, Sweden,
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Quint JK, Donaldson GC, Wassef N, Hurst JR, Thomas M, Wedzicha JA. 25-hydroxyvitamin D deficiency, exacerbation frequency and human rhinovirus exacerbations in chronic obstructive pulmonary disease. BMC Pulm Med 2012; 12:28. [PMID: 22726649 PMCID: PMC3403978 DOI: 10.1186/1471-2466-12-28] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 06/22/2012] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND 25-hydroxyvitamin D deficiency is associated with COPD and increased susceptibility to infection in the general population. METHODS We investigated whether COPD patients deficient in 25-hydroxyvitamin D were more likely to be frequent exacerbators, had reduced outdoor activity and were more susceptible to human rhinovirus (HRV) exacerbations than those with insufficient and normal levels. We also investigated whether the frequency of FokI, BsmI and TaqIα 25-hydroxyvitamin D receptor (VDR) polymorphisms differed between frequent and infrequent exacerbators. RESULTS There was no difference in 25-hydroxyvitamin D levels between frequent and infrequent exacerbators in the summer; medians 44.1 nmol/L (29.1 - 68.0) and 39.4 nmol/L (22.3 - 59.2) or winter; medians 24.9 nmol/L (14.3 - 43.1) and 27.1 nmol/L (19.9 - 37.6). Patients who spent less time outdoors in the 14 days prior to sampling had lower 25-hydroxyvitamin D levels (p = 0.02). Day length was independently associated with 25-hydroxyvitamin D levels (p = 0.02). There was no difference in 25-hydroxyvitamin D levels between baseline and exacerbation; medians 36.2 nmol/L (IQR 22.4-59.4) and 33.3 nmol/L (23.0-49.7); p = 0.43. HRV positive exacerbations were not associated with lower 25-hydroxyvitamin D levels at exacerbation than exacerbations that did not test positive for HRV; medians 30.0 nmol/L (20.4 - 57.8) and 30.6 nmol/L (19.4 - 48.7). There was no relationship between exacerbation frequency and any VDR polymorphisms (all p > 0.05). CONCLUSIONS Low 25-hydroxyvitamin D levels in COPD are not associated with frequent exacerbations and do not increase susceptibility to HRV exacerbations. Independent of day length, patients who spend less time outdoors have lower 25-hydroxyvitamin D concentration.
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Affiliation(s)
- Jennifer K Quint
- Academic Unit of Respiratory Medicine, University College London Medical School, Royal Free Campus, Rowland Hill Street, London, UK
| | - Gavin C Donaldson
- Academic Unit of Respiratory Medicine, University College London Medical School, Royal Free Campus, Rowland Hill Street, London, UK
| | - Nancy Wassef
- Department of Clinical Biochemistry, Royal Free Hospital, Pond Street, London, UK
| | - John R Hurst
- Academic Unit of Respiratory Medicine, University College London Medical School, Royal Free Campus, Rowland Hill Street, London, UK
| | - Michael Thomas
- Department of Clinical Biochemistry, Royal Free Hospital, Pond Street, London, UK
| | - Jadwiga A Wedzicha
- Academic Unit of Respiratory Medicine, University College London Medical School, Royal Free Campus, Rowland Hill Street, London, UK
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Herr C, Greulich T, Koczulla RA, Meyer S, Zakharkina T, Branscheidt M, Eschmann R, Bals R. The role of vitamin D in pulmonary disease: COPD, asthma, infection, and cancer. Respir Res 2011; 12:31. [PMID: 21418564 PMCID: PMC3071319 DOI: 10.1186/1465-9921-12-31] [Citation(s) in RCA: 137] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2010] [Accepted: 03/18/2011] [Indexed: 12/24/2022] Open
Abstract
The role of vitamin D (VitD) in calcium and bone homeostasis is well described. In the last years, it has been recognized that in addition to this classical function, VitD modulates a variety of processes and regulatory systems including host defense, inflammation, immunity, and repair. VitD deficiency appears to be frequent in industrialized countries. Especially patients with lung diseases have often low VitD serum levels. Epidemiological data indicate that low levels of serum VitD is associated with impaired pulmonary function, increased incidence of inflammatory, infectious or neoplastic diseases. Several lung diseases, all inflammatory in nature, may be related to activities of VitD including asthma, COPD and cancer. The exact mechanisms underlying these data are unknown, however, VitD appears to impact on the function of inflammatory and structural cells, including dendritic cells, lymphocytes, monocytes, and epithelial cells. This review summarizes the knowledge on the classical and newly discovered functions of VitD, the molecular and cellular mechanism of action and the available data on the relationship between lung disease and VitD status.
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Affiliation(s)
- Christian Herr
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
- Department of Pulmonology, University of the Saarland, 66421 Homburg Saar, Germany
| | - Timm Greulich
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
| | - Rembert A Koczulla
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
| | - Silke Meyer
- Department of Internal Medicine, Division of Endocrinology & Diabetology, Department of Internal Medicine, University Hospital Marburg, 35043 Marburg, Germany
| | - Tetyana Zakharkina
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
- Department of Pulmonology, University of the Saarland, 66421 Homburg Saar, Germany
| | - Meret Branscheidt
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
| | - Rebecca Eschmann
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
| | - Robert Bals
- Department of Internal Medicine, Division for Pulmonary Diseases, Philipps-Universtät Marburg, 35043 Marburg, Germany
- Department of Pulmonology, University of the Saarland, 66421 Homburg Saar, Germany
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Choi JW, Joo JI, Kim DH, Wang X, Oh TS, Choi DK, Yun JW. Proteome changes in rat plasma in response to sibutramine. Proteomics 2011; 11:1300-12. [DOI: 10.1002/pmic.201000664] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Revised: 12/08/2010] [Accepted: 12/29/2010] [Indexed: 11/09/2022]
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Choi JW, Wang X, Joo JI, Kim DH, Oh TS, Choi DK, Yun JW. Plasma proteome analysis in diet-induced obesity-prone and obesity-resistant rats. Proteomics 2010; 10:4386-400. [PMID: 21136593 DOI: 10.1002/pmic.201000391] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
One of the major issues in the field of obesity is why some humans become obese and others resist development of obesity when exposed to high-calorie diets. Despite the same genetic background, namely obesity-prone (OP) and -resistant (OR) rats, differing responses have been demonstrated in a high fat diet-induced rodent model. The aim of the present study was to discover novel obesity-related biomarkers for susceptibility and/or resistance to obesity by proteomic analysis of OP and OR rat plasma. After feeding of high fat diet, OP rats gained approximately 25% more body weight than OR rats and were used for proteomic analysis using 2-DE combined with MALDI-TOF-MS. We categorized identified proteins into three groups by analysis of both average spot density in each group and individual spot density of six rats as a function of body weight. Consequently, category (1) included inter-α-inhibitor H4 heavy chain and fetuin B precursor, which can be used as novel plasma biomarkers for risk of obesity. Nine proteins of category (2) and (3) can also be plausible plasma markers in the study of obesity. This proteomic study is an important advancement over the previous steps needed for identification of OP and OR rats.
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Affiliation(s)
- Jung-Won Choi
- Department of Biotechnology, Daegu University, Kyungsan, Kyungbuk, Republic of Korea
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Speeckaert MM, Taes YE, De Buyzere ML, Christophe AB, Kaufman JM, Delanghe JR. Investigation of the potential association of vitamin D binding protein with lipoproteins. Ann Clin Biochem 2010; 47:143-50. [PMID: 20144976 DOI: 10.1258/acb.2009.009018] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
BACKGROUND Vitamin D binding protein (DBP) acts as a vitamin D carrier and an actin scavenger. We have previously reported a correlation between serum DBP and lipid parameters in a cystic fibrosis population. In the present study, the relationship between serum DBP, lipoprotein fractions and vitamin D is investigated. METHODS The presence of DBP in lipoprotein fractions was examined using precipitation, gel permeation chromatography and ultracentrifugation. The association between DBP and lipids was investigated in a cohort study of 211 men. Total and actin-free DBP concentrations were assessed by immunonephelometry and enzyme-linked immunosorbent assay. Serum 25(OH)- and 1.25(OH)(2)-vitamin D(3) were assayed by radioimmunoassay. Total cholesterol, high-density lipoprotein cholesterol (HDL), triglycerides and insulin were measured using routine methods. Low-density lipoprotein-cholesterol (LDL) was calculated according to Friedewald's formula. RESULTS DBP was found to be present in very-low-density lipoprotein (VLDL). Gel permeation chromatography revealed a bimodal DBP distribution with a lipid-bound fraction besides the known free fraction. Ultracentrifugation confirmed the presence of DBP and 25(OH)-vitamin D(3) in the VLDL particle. Total serum DBP concentration and the actin-bound DBP/DBP ratio correlated significantly with total cholesterol, LDL-cholesterol, triglycerides and albumin. The 25(OH)-vitamin D(3)/DBP ratio correlated negatively with serum triglyceride concentration and body mass index (BMI). The actin-bound DBP complex was identified with Western blot. CONCLUSIONS The lipid-bound DBP fraction may be of greater importance than initially thought. The present findings may have clinical consequences in view of the important physiological role of DBP.
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Li WF, Hou SX, Yu B, Li MM, Férec C, Chen JM. Genetics of osteoporosis: accelerating pace in gene identification and validation. Hum Genet 2009; 127:249-85. [PMID: 20101412 DOI: 10.1007/s00439-009-0773-z] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Accepted: 11/25/2009] [Indexed: 02/06/2023]
Abstract
Osteoporosis is characterized by low bone mineral density and structural deterioration of bone tissue, leading to an increased risk of fractures. It is the most common metabolic bone disorder worldwide, affecting one in three women and one in eight men over the age of 50. In the past 15 years, a large number of genes have been reported as being associated with osteoporosis. However, only in the past 4 years we have witnessed an accelerated pace in identifying and validating osteoporosis susceptibility loci. This increase in pace is mostly due to large-scale association studies, meta-analyses, and genome-wide association studies of both single nucleotide polymorphisms and copy number variations. A comprehensive review of these developments revealed that, to date, at least 15 genes (VDR, ESR1, ESR2, LRP5, LRP4, SOST, GRP177, OPG, RANK, RANKL, COLIA1, SPP1, ITGA1, SP7, and SOX6) can be reasonably assigned as confirmed osteoporosis susceptibility genes, whereas, another >30 genes are promising candidate genes. Notably, confirmed and promising genes are clustered in three biological pathways, the estrogen endocrine pathway, the Wnt/beta-catenin signaling pathway, and the RANKL/RANK/OPG pathway. New biological pathways will certainly emerge when more osteoporosis genes are identified and validated. These genetic findings may provide new routes toward improved therapeutic and preventive interventions of this complex disease.
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Affiliation(s)
- Wen-Feng Li
- Department of Orthopaedics, The First Affiliated Hospital, General Hospital of the People's Liberation Army, 100037 Beijing, China
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Winters SJ, Chennubhatla R, Wang C, Miller JJ. Influence of obesity on vitamin D-binding protein and 25-hydroxy vitamin D levels in African American and white women. Metabolism 2009; 58:438-42. [PMID: 19303961 DOI: 10.1016/j.metabol.2008.10.017] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2008] [Accepted: 10/20/2008] [Indexed: 10/21/2022]
Abstract
25-Hydroxy vitamin D (25OHD) is lipophilic and highly bound to vitamin D-binding protein (VDBP) in plasma. In the present study, we examined VDBP and 25OHD levels by race and body mass index (BMI) in young adult women to determine whether circulating VDBP plays a role in the low levels of 25OHD with obesity and among African Americans. In agreement with previous studies, mean 25OHD levels were lower in African American women than in whites (P < .01). In a hierarchical multiple regression model, BMI was associated with 25OHD after adjustment for age in white women (P = .02, R(2) = .10) but not in African American women. The VDBP levels, by contrast, were similar in African Americans and whites, and were unrelated to BMI in either racial group. Furthermore, VDBP was unrelated to the plasma level of 25OHD. These data confirm an interaction between race and obesity in vitamin D metabolism, and imply that the carrier protein is not an important determinant of circulating 25OHD in women, nor is it affected by race or adiposity.
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Affiliation(s)
- Stephen J Winters
- Division of Endocrinology, Metabolism and Diabetes, University of Louisville, Louisville, KY 40202, USA.
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Janssens W, Lehouck A, Carremans C, Bouillon R, Mathieu C, Decramer M. Vitamin D beyond bones in chronic obstructive pulmonary disease: time to act. Am J Respir Crit Care Med 2009; 179:630-6. [PMID: 19164701 DOI: 10.1164/rccm.200810-1576pp] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The discovery that the vitamin D endocrine system regulates a very large number of genes and their associated biological processes improves our insight into the fundamental role of vitamin D and sun exposure for human health. Accumulating epidemiological data are linking a low vitamin D nutritional status to highly prevalent diseases such as cancer, autoimmune diseases, and chronic infections. Approximately half of the world's elderly, and to a lesser extent the adult population, have insufficient to deficient 25-hydroxyvitamin D (25-OHD) serum levels, and several intervention studies are being undertaken to study the impact of adequate vitamin D supplementation in chronic diseases. In this perspective we claim that chronic obstructive pulmonary disease (COPD) is a candidate disease for which vitamin D supplementation might be beneficial. Epidemiological studies revealed a dose-dependent association between serum 25-OHD levels and pulmonary function so that adequate vitamin D supplementation may extend beyond its protection against osteoporotic fractures. In line with the novel insights on its immune function, it is tempting to speculate that vitamin D may down-regulate the inflammatory immune response in the airways while boosting innate immune defense against different microorganisms. Apart from its affects on osteoporosis, vitamin D may also interfere with other comorbidities of COPD such as skeletal muscle weakness, cardiovascular disease, and cancer. Because respiratory treatments in COPD fail to reverse disease progression, interventional trials that may exploit the broader potential of vitamin D are warranted. A further challenge of such studies is to define optimal serum 25-OHD levels for such noncalcemic endpoints.
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Affiliation(s)
- Wim Janssens
- Division of Respiratory Medicine, University Hospital Gasthuisberg (KUL) Herestraat 49, 3000 Leuven, Belgium.
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Speeckaert MM, Glorieux GL, Vanholder R, Van Biesen W, Taes YE, Clement F, Wehlou C, Delanghe JR. Vitamin D Binding Protein and the Need for Vitamin D in Hemodialysis Patients. J Ren Nutr 2008; 18:400-7. [DOI: 10.1053/j.jrn.2008.04.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2007] [Indexed: 11/11/2022] Open
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Al-oanzi ZH, Tuck SP, Mastana SS, Summers GD, Cook DB, Francis RM, Datta HK. Vitamin D-binding protein gene microsatellite polymorphism influences BMD and risk of fractures in men. Osteoporos Int 2008; 19:951-60. [PMID: 18038108 DOI: 10.1007/s00198-007-0516-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2007] [Accepted: 10/29/2007] [Indexed: 02/05/2023]
Abstract
UNLABELLED Here we report the results of a vitamin D-binding protein gene microsatellite polymorphism study in 170 men, comprising healthy male subjects and men with osteoporosis-related symptomatic vertebral fractures. We confirm the results of an earlier study in a different cohort, showing relationship between certain genotypes of (TAAAn)-Alu repeats and reduced BMD and vertebral fractures. INTRODUCTION Vitamin D-binding protein (DBP) plays a critical role in the transport and metabolism of metabolites of vitamin D, including the key calciotropic hormone 1alpha,25-dihydroxyvitamin D3 (1,25(OH)2D3). METHODS We have investigated intra-intronic variable tandem (TAAA)n-Alu repeat expansion in the DBP gene in 170 men, comprising healthy male subjects and men with idiopathic osteoporosis and low trauma fractures. RESULTS AND CONCLUSIONS The predominant DBP-Alu genotype in the control subjects was 10/10 (frequency 0.421), whereas the frequency of this genotype in men with osteoporosis was 0.089. DBP-Alu alleles *10, *8 and *9, respectively, were the three commonest in both healthy subjects and men with osteoporosis. Allele *10 was associated with a lower risk of osteoporosis (OR 0.39, 95% CI 0.25-0.64; p < 0.0005), as was allele *11 (odds ratio 0.09, 95% CI 0.01-0.67; p < 0.007). Logistic regression gave similar results, showing that individuals with genotype 10/10 and 19-20 repeats (genotypes 9/10, 9/11, 10/10,) are protected from fracture or osteoporosis. Overall, there was a relationship between DBP Alu genotype and BMD, suggesting that DBP-Alu genotype may influence fracture risk. This effect may be mediated by changes in the circulating concentrations of DBP which influences free concentrations of vitamin D.
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Affiliation(s)
- Z H Al-oanzi
- School of Clinical & Laboratory Sciences, The Medical School, University of Newcastle, Newcastle upon Tyne, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK
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Speeckaert MM, Wehlou C, Vandewalle S, Taes YE, Robberecht E, Delanghe JR. Vitamin D binding protein, a new nutritional marker in cystic fibrosis patients. Clin Chem Lab Med 2008; 46:365-70. [PMID: 18303991 DOI: 10.1515/cclm.2008.084] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Vitamin D binding protein (DBP) is a multifunctional transport protein with a decreased serum concentration in cystic fibrosis (CF). The present study investigates the importance of DBP and its role as an alternative nutritional marker in CF. METHODS DBP phenotypes of 116 CF patients were determined electrophoretically. Serum DBP was measured by immunonephelometry. Parathormone was assessed by an immunoradiometric assay. Serum 25OH vitamin D(3), 1,25(OH)(2) vitamin D(3) and leptin concentrations were determined by a radioimmunoassay. Serum alpha-tocopherol was measured by HPLC. Routine chemistry parameters were assessed using commercial methods. The Prognostic Inflammatory and Nutritional Index was calculated. RESULTS Decreased serum DBP concentrations were observed in the CF group. Total cholesterol, low-density lipoprotein (LDL)-cholesterol, triglyceride concentration, alpha-tocopherol and a low nutritional status correlated positively with DBP. Lipoprotein precipitation demonstrated a partial presence of DBP in very-low-density lipoprotein and LDL. Furthermore, DBP was positively correlated with serum leptin concentration. CONCLUSIONS The present study demonstrates a positive correlation between DBP and serum lipids. Serum DBP concentration can be considered as a nutritional marker (especially for lipids).
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Bibliography. Current world literature. Parathyroids, bone and mineral metabolism. Curr Opin Endocrinol Diabetes Obes 2007; 14:494-501. [PMID: 17982358 DOI: 10.1097/med.0b013e3282f315ef] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bolland MJ, Grey AB, Ames RW, Horne AM, Mason BH, Wattie DJ, Gamble GD, Bouillon R, Reid IR. Age-, gender-, and weight-related effects on levels of 25-hydroxyvitamin D are not mediated by vitamin D binding protein. Clin Endocrinol (Oxf) 2007; 67:259-64. [PMID: 17547688 DOI: 10.1111/j.1365-2265.2007.02873.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
OBJECTIVE 25-hydroxyvitamin D (25OHD) levels are inversely related to body weight, and have been reported to decline with age and be lower in women than men. We hypothesized that these findings might be explained by effects of these variables on vitamin D binding protein (DBP) levels. We set out to determine the relationships between DBP and gender, 25OHD, body weight and body composition. DESIGN Cross-sectional analysis. PATIENTS One hundred healthy, middle-aged and older, community-dwelling men and women. MEASUREMENTS All participants were measured for 25OHD, DBP, body weight, bone mineral density and body composition. RESULTS Women had higher mean DBP levels than men but lower total 25OHD levels [DBP: women, mean (SD) 339 (36) mg/l, men 307 (71) mg/l, P = 0.005; 25OHD: women 67 (23) nmol/l, men 91 (39) nmol/l, P < 0.001]. In women, there were significant positive relationships between DBP and albumin (r = 0.33) and 25OHD (r = 0.34) whereas in men there were no significant relationships between DBP and any measured variables. There was no significant relationship between DBP and age, body weight, body mass index, fat mass or percentage fat in men or women. CONCLUSION We found no evidence to support the hypothesis that DBP levels are related to age, or adiposity. The changes in 25OHD levels with age, gender, or fat mass are not due to underlying relationships between DBP and these variables. This suggests that the relationships consistently observed between 25OHD and body composition and gender are of biological origin and not due to adaptation to changes in transport proteins.
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Affiliation(s)
- Mark J Bolland
- Department of Medicine, University of Auckland, Auckland, New Zealand.
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Jiang H, Xiong DH, Guo YF, Shen H, Xiao P, Yang F, Chen Y, Zhang F, Recker RR, Deng HW. Association analysis of vitamin D-binding protein gene polymorphisms with variations of obesity-related traits in Caucasian nuclear families. Int J Obes (Lond) 2007; 31:1319-24. [PMID: 17342072 DOI: 10.1038/sj.ijo.0803583] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Vitamin D-binding protein (DBP) gene is well known for its function on glucose and vitamin D metabolism in human populations. Previous studies suggested that the in vivo DBP level may play a role in the etiology of obesity. However, few studies explored the contribution of DBP gene to the variance of obesity phenotypes. OBJECTIVE To investigate the relationship of DBP polymorphisms and obesity in Caucasian nuclear families. DESIGN We genotyped 14 single-nucleotide polymorphisms (SNPs) located in and around the DBP gene in 1873 Caucasian subjects from 405 nuclear families. Three obesity-related quantitative phenotypes were investigated, including body mass index (BMI), fat mass and percentage of fat mass (PFM). Single SNPs and haplotypes (three blocks) were tested by family-based association using the FBAT software. RESULTS SNP2 (rs17467825) and its corresponding haplotype GAA (frequency 0.270) in block 1 showed strongest associations with PFM (P=0.0011 and 0.0023, respectively). In multivariate test significant association was also observed for SNP2 with fat mass&BMI&PFM (P=0.0098). Subsequent sex-stratified analyses demonstrated nominal association for SNP2 and haplotype GAA with PFM in the female subgroup. CONCLUSION Polymorphisms of DBP gene were significantly association with human PFM, especially in female, suggesting the importance of DBP gene in the pathogenesis of human obesity.
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Affiliation(s)
- H Jiang
- Laboratory of Molecular and Statistical Genetics, College of Life Sciences, Hunan Normal University, Changsha, Hunan, PR China
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Bibliography. Current world literature. Growth and development. Curr Opin Endocrinol Diabetes Obes 2007; 14:74-89. [PMID: 17940424 DOI: 10.1097/med.0b013e32802e6d87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Speeckaert M, Huang G, Delanghe JR, Taes YEC. Biological and clinical aspects of the vitamin D binding protein (Gc-globulin) and its polymorphism. Clin Chim Acta 2006; 372:33-42. [PMID: 16697362 DOI: 10.1016/j.cca.2006.03.011] [Citation(s) in RCA: 340] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2006] [Revised: 03/10/2006] [Accepted: 03/10/2006] [Indexed: 11/23/2022]
Abstract
The vitamin D binding protein (DBP) is the major plasma carrier protein of vitamin D and its metabolites. Unlike other hydrophobic hormone-binding systems, it circulates in a considerably higher titer compared to its ligands. Apart from its specific sterol binding capacity, DBP exerts several other important biological functions such as actin scavenging, fatty acid transport, macrophage activation and chemotaxis. The DBP-gene is a member of a multigene cluster that includes albumin, alpha-fetoprotein, and alpha-albumin/afamin. All four genes are expressed predominantly in the liver with overlapping developmental profiles. DBP is a highly polymorphic serum protein with three common alleles (Gc1F, Gc1S and Gc2) and more than 120 rare variants. The presence of unique alleles is a useful tool for anthropological studies to discriminate and to reveal ancestral links between populations. Many studies have discussed the link between DBP-phenotypes and susceptibility or resistance to osteoporosis, Graves' disease, Hashimoto's thyroiditis, diabetes, COPD, AIDS, multiple sclerosis, sarcoidosis and rheumatic fever. This article reviews the general characteristics, functions and clinical aspects of DBP.
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