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Lee J, Bae EH, Kim SW, Chung W, Kim YH, Oh YK, Kim YS, Oh KH, Park SK. The association between vitamin D deficiency and risk of renal event: Results from the Korean cohort study for outcomes in patients with chronic kidney disease (KNOW-CKD). Front Med (Lausanne) 2023; 10:1017459. [PMID: 36873872 PMCID: PMC9978501 DOI: 10.3389/fmed.2023.1017459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 01/31/2023] [Indexed: 02/18/2023] Open
Abstract
Backgrounds Some observational studies have suggested a possible association between vitamin D deficiency and CKD. However, in most studies, the causality between low levels of vitamin D and risk of renal events could not be explained. We investigated the relationship between vitamin D deficiency and risk of severe CKD stage and renal event in a large-scale prospective cohort study. Methods We used data from a prospective cohort of 2,144 patients with available information on serum 25-hydroxyvitamin D (25(OH)D) levels at baseline from KNOW-CKD, 2011-2015 were included. Vitamin D deficiency was defined as serum 25(OH)D levels < 15 ng/mL. We performed a cross-sectional analysis to elucidate the relationship between 25(OH)D and CKD stage using baseline CKD patient data. We further examined a cohort analysis to clarify the association between 25(OH)D and risk of renal event. Renal event was a composite of the first occurrence of a 50% decline in eGFR from the baseline value or the onset of CKD stage 5 (initiation of dialysis or kidney transplantation) across the follow-up period. We also investigated the associations of vitamin D deficiency with risk of renal event according to diabetes and overweight status. Results Vitamin D deficiency were significantly associated with an increased risk of severe CKD stage - 1.30-fold (95% CI: 1.10-1.69) for 25(OH)D. Deficiency of 25(OH)D with 1.64-fold (95% CI: 1.32-2.65) was related to renal event compared with the reference. Furthermore, vitamin D deficiency patients with presence of DM and overweight status also displayed higher risk than non-deficient patients for risk of renal event. Conclusion Vitamin D deficiency is associated with significantly increased risk of severe CKD stage and renal event.
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Affiliation(s)
- Juyeon Lee
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
- Department of Biomedical Science, College of Medicine, Seoul National University, Seoul, Republic of Korea
- Department Cancer Institution, Seoul National University, Seoul, Republic of Korea
| | - Eun Hui Bae
- Department of Internal Medicine, Chonnam National University Medical School and Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Soo Wan Kim
- Department of Internal Medicine, Chonnam National University Medical School and Chonnam National University Hospital, Gwangju, Republic of Korea
| | - Wookyung Chung
- Department of Internal Medicine, Gachon University, Gil Hospital, Incheon, Republic of Korea
| | - Yeong Hoon Kim
- Department of Internal Medicine, Inje University, Busan Paik Hospital, Busan, Republic of Korea
| | - Yun Kyu Oh
- Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Yong-Soo Kim
- Department of Internal Medicine, College of Medicine, Catholic University of Korea, Seoul, Republic of Korea
| | - Kook-Hwan Oh
- Division of Nephrology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Sue K. Park
- Department of Preventive Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
- Department Cancer Institution, Seoul National University, Seoul, Republic of Korea
- Interdisciplinary Program in Cancer Biology, College of Medicine, Seoul National University, Seoul, Republic of Korea
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Setayesh L, Casazza K, Moradi N, Mehranfar S, Yarizadeh H, Amini A, Yekaninejad MS, Mirzaei K. Association of vitamin D-binding protein and vitamin D 3 with insulin and homeostatic model assessment (HOMA-IR) in overweight and obese females. BMC Res Notes 2021; 14:193. [PMID: 34011380 PMCID: PMC8136187 DOI: 10.1186/s13104-021-05608-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 05/11/2021] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE Equivocal association the contribution of 25-hydroxyvitamin D (25(OH)D) and the well-accepted role of vitamin D-binding protein (VDBP) on bioavailability of 25(OH)D or its independent roles, has led to possible association of the VDBP in glucose metabolism. This study was conducted to evaluate the relationships among 25(OH)D, VDBP, glucose/insulin metabolism and homeostatic model assessment (HOMA-IR). Blood samples were collected from 236 obese and overweight women. VDBP and 25(OH)D levels, and biochemical parameters were measured using an enzyme-linked immunosorbent assay (ELISA). An impedance fat analyzer was utilized to acquire the body composition. RESULTS Using the multivariate linear regression, a reverse relationship was observed between VDBP and (HOMA-IR), such that women with higher VDBP displayed lower insulin resistance. The relationship was independent of age, body mass index, standardized energy intake and physical activity (p = 0.00). No significant relationship between 25(OH)D levels, FBS, body composition or insulin resistance were observed (p > 0.2). Current study observed that higher level of VDBP may be associated with lower levels of insulin and HOMA-IR, thus the evaluation of VDBP in diverse population groups seems to have significant clinical value in evaluating the prevalence of DM or early stage of glucose intolerance.
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Affiliation(s)
- Leila Setayesh
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, P.O. Box: 14155-6117, Tehran, Iran.,Students Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran
| | - Krista Casazza
- Marieb College of Health and Human Services, Florida Gulf Coast University, Florida, FL, USA
| | - Nariman Moradi
- Cellular and Molecular Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Sanaz Mehranfar
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, P.O. Box: 14155-6117, Tehran, Iran
| | - Habib Yarizadeh
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, P.O. Box: 14155-6117, Tehran, Iran
| | - Abbas Amini
- Department of Mechanical Engineering, Australian College of Kuwait, 13015, Safat, Kuwait
| | - Mir Saeed Yekaninejad
- Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Khadijeh Mirzaei
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, P.O. Box: 14155-6117, Tehran, Iran.
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3
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Abidin NZ, Mitra SR. Total vs. Bioavailable: Determining a Better 25(OH)D Index in Association with Bone Density and Muscle Mass in Postmenopausal Women. Metabolites 2020; 11:23. [PMID: 33396337 DOI: 10.3390/metabo11010023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 12/18/2020] [Accepted: 12/19/2020] [Indexed: 12/19/2022] Open
Abstract
The concurrent presence of low bone density (osteopenia/osteoporosis) and low muscle mass (sarcopenia) in older adults has led to the recognition of “osteosarcopenia” (OS) as a singular entity. Vitamin D may play important role in the manifestation of OS, in terms of intake, absorption, and bioavailability. Evidence suggests that bioavailable 25(OH)D may be a better indicator of Vitamin D compared to total 25(OH)D due to its weak bind to albumin, increasing its ‘availability’. The aim of this study was to assess total and bioavailable 25(OH)D levels in postmenopausal women and to determine their associations to bone density and muscle mass. We assessed body composition, bone density, and 25(OH)D indices of multiethnic, postmenopausal Malaysian women. A significant and negative correlation was found between body fat % and each index of 25(OH)D. Both bioavailable and total 25(OH)D were positively correlated with serum calcium and negatively correlated with iPTH(intact parathyroid hormone). VDBP(Vitamin D binding protein) level was significantly correlated with bioavailable 25(OH)D level, but not with the total 25(OH)D level. Stepwise regression analysis revealed that bioavailable, but not total, 25(OH)D was significantly correlated to bone density and muscle mass, (where stronger correlation was found with bone density), suggesting its superiority. Nevertheless, the low effect size warrants further studies.
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Yi M, Ma Y, Zhu S, Luo C, Chen Y, Wang Q, Deng H. Comparative proteomic analysis identifies biomarkers for renal aging. Aging (Albany NY) 2020; 12:21890-21903. [PMID: 33159023 PMCID: PMC7695359 DOI: 10.18632/aging.104007] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 08/14/2020] [Indexed: 12/24/2022]
Abstract
Proteomics have long been applied into characterization of molecular signatures in aging. Due to different methods and instrumentations employed for proteomic analysis, inter-dataset validation needs to be performed to identify potential biomarkers for aging. In this study, we used comparative proteomics analysis to profile age-associated changes in proteome and glutathionylome in mouse kidneys. We identified 108 proteins that were differentially expressed in young and aged mouse kidneys in three different datasets; from these, 27 proteins were identified as potential renal aging biomarkers, including phosphoenolpyruvate carboxykinase (Pck1), CD5 antigen-like protein (Cd5l), aldehyde dehydrogenase 1 (Aldh1a1), and uromodulin. Our results also showed that peroxisomal proteins were significantly downregulated in aged mice, whereas IgGs were upregulated, suggesting that peroxisome deterioration might be a hallmark for renal aging. Glutathionylome analysis demonstrated that downregulation of catalase and glutaredoxin-1 (Glrx1) significantly increased protein glutathionylation in aged mice. In addition, nicotinamide mononucleotide (NMN) administration significantly increased the number of peroxisomes in aged mouse kidneys, indicating that NMN enhanced peroxisome biogenesis, and suggesting that it might be beneficial to reduce kidney injuries. Together, our data identify novel potential biomarkers for renal aging, and provide a valuable resource for understanding the age-associated changes in kidneys.
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Affiliation(s)
- Meiqi Yi
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systematic Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Yingying Ma
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systematic Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Songbiao Zhu
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systematic Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Chengting Luo
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systematic Biology, School of Life Sciences, Tsinghua University, Beijing, China.,Beijing Chaoyang Hospital Affiliated to Capital Medical University, Beijing, China
| | - Yuling Chen
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systematic Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Qingtao Wang
- Beijing Chaoyang Hospital Affiliated to Capital Medical University, Beijing, China
| | - Haiteng Deng
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and Systematic Biology, School of Life Sciences, Tsinghua University, Beijing, China
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Książek A, Zagrodna A, Słowińska-Lisowska M. Vitamin D, Skeletal Muscle Function and Athletic Performance in Athletes-A Narrative Review. Nutrients 2019; 11:nu11081800. [PMID: 31382666 PMCID: PMC6722905 DOI: 10.3390/nu11081800] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/31/2019] [Accepted: 08/02/2019] [Indexed: 12/14/2022] Open
Abstract
The active form of vitamin D (calcitriol) exerts its biological effects by binding to nuclear vitamin D receptors (VDRs), which are found in most human extraskeletal cells, including skeletal muscles. Vitamin D deficiency may cause deficits in strength, and lead to fatty degeneration of type II muscle fibers, which has been found to negatively correlate with physical performance. Vitamin D supplementation has been shown to improve vitamin D status and can positively affect skeletal muscles. The purpose of this study is to summarize the current evidence of the relationship between vitamin D, skeletal muscle function and physical performance in athletes. Additionally, we will discuss the effect of vitamin D supplementation on athletic performance in players. Further studies are necessary to fully characterize the underlying mechanisms of calcitriol action in the human skeletal muscle tissue, and to understand how these actions impact the athletic performance in athletes.
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Affiliation(s)
- Anna Książek
- Department of the Biological and Motor Basis of Sport, University School of Physical Education, Wrocław 51612, Poland.
| | - Aleksandra Zagrodna
- Department of the Biological and Motor Basis of Sport, University School of Physical Education, Wrocław 51612, Poland
| | - Małgorzata Słowińska-Lisowska
- Department of the Biological and Motor Basis of Sport, University School of Physical Education, Wrocław 51612, Poland
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Dzik KP, Kaczor JJ. Mechanisms of vitamin D on skeletal muscle function: oxidative stress, energy metabolism and anabolic state. Eur J Appl Physiol 2019; 119:825-839. [PMID: 30830277 PMCID: PMC6422984 DOI: 10.1007/s00421-019-04104-x] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Accepted: 02/13/2019] [Indexed: 02/08/2023]
Abstract
Purpose This review provides a current perspective on the mechanism of vitamin D on skeletal muscle function with the emphasis on oxidative stress, muscle anabolic state and muscle energy metabolism. It focuses on several aspects related to cellular and molecular physiology such as VDR as the trigger point of vitamin D action, oxidative stress as a consequence of vitamin D deficiency. Method The interaction between vitamin D deficiency and mitochondrial function as well as skeletal muscle atrophy signalling pathways have been studied and clarified in the last years. To the best of our knowledge, we summarize key knowledge and knowledge gaps regarding the mechanism(s) of action of vitamin D in skeletal muscle. Result Vitamin D deficiency is associated with oxidative stress in skeletal muscle that influences the mitochondrial function and affects the development of skeletal muscle atrophy. Namely, vitamin D deficiency decreases oxygen consumption rate and induces disruption of mitochondrial function. These deleterious consequences on muscle may be associated through the vitamin D receptor (VDR) action. Moreover, vitamin D deficiency may contribute to the development of muscle atrophy. The possible signalling pathway triggering the expression of Atrogin-1 involves Src-ERK1/2-Akt- FOXO causing protein degradation. Conclusion Based on the current knowledge we propose that vitamin D deficiency results from the loss of VDR function and it could be partly responsible for the development of neurodegenerative diseases in human beings.
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Affiliation(s)
- Katarzyna Patrycja Dzik
- Department of Neurobiology of Muscle, Gdansk University of Physical Education and Sport, Kazimierza Gorskiego 1, 80-336, Gdansk, Poland
| | - Jan Jacek Kaczor
- Department of Neurobiology of Muscle, Gdansk University of Physical Education and Sport, Kazimierza Gorskiego 1, 80-336, Gdansk, Poland.
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Abstract
Cardiovascular disease has earned its place as one of the leading noncommunicable diseases that has become a modern-day global epidemic. The increasing incidence and prevalence of chronic kidney disease (CKD) has added to this enormous burden, given that CKD is now recognized as an established risk factor for accelerated cardiovascular disease. In fact, cardiovascular disease remains the leading cause of death in the CKD population, with significant prognostic implications. Alterations in vitamin D levels as renal function declines has been linked invariably to the development of cardiovascular disease beyond a mere epiphenomenon, and has become an important focus in recent years in our search for new therapies. Another compound, cinacalcet, which belongs to the calcimimetic class of agents, also has taken center stage over the past few years as a potential cardiovasculoprotective agent. However, given limited well-designed randomized trials to inform us, our clinical practice for the management of cardiovascular disease in CKD has not been adequately refined. This article considers the biological mechanisms, regulation, and current experimental, clinical, and trial data available to help guide the therapeutic use of vitamin D and calcimimetics in the setting of CKD and cardiovascular disease.
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Affiliation(s)
- Kenneth Lim
- Division of Nephrology, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
| | - Takayuki Hamano
- Department of Comprehensive Kidney Disease Research, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Ravi Thadhani
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA
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Abstract
The last decade has seen a dramatic increase in general interest in and research into vitamin D, with many athletes now taking vitamin D supplements as part of their everyday dietary regimen. The most recognized role of vitamin D is its regulation of calcium homeostasis; there is a strong relationship between vitamin D and bone health in non-athletic individuals. In contrast, data have consistently failed to demonstrate any relationship between serum 25[OH]D and bone health, which may in part be due to the osteogenic stimulus of exercise. Vitamin D may interact with extra-skeletal tissues such as muscle and the immune system to modulate recovery from damaging exercise and infection risk. Given that many athletes now engage in supplementation, often consuming extreme doses of vitamin D, it is important to assess whether excessive vitamin D can be detrimental to health. It has been argued that toxic effects only occur when serum 25[OH]D concentrations are greater than 180 nmol·l-1, but data from our laboratory have suggested high-dose supplementation could be problematic. Finally, there is a paradoxical relationship between serum 25[OH]D concentration, ethnicity, and markers of bone health: Black athletes often present with low serum 25[OH]D without physiological consequences. One explanation for this could be genetic differences in vitamin D binding protein due to ethnicity, resulting in greater concentrations of bioavailable (or free) vitamin D in some ethnic groups. In the absence of any pathology, screening may be unnecessary and could result in incorrect supplementation. Data must now be re-examined, taking into consideration bioavailable or "free" vitamin D in ethnically diverse groups to enable new thresholds and target concentrations to be established; perhaps, for now, it is time to "set vitamin D free".
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Affiliation(s)
- Daniel J Owens
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Tom Reilly Building, Byrom Street, Liverpool, L3 3AF, UK
| | - Richard Allison
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Tom Reilly Building, Byrom Street, Liverpool, L3 3AF, UK.,Exercise and Sport Science Department, ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar.,Arsenal Football Club, Bell Lane, London Colney, St Albans, Shenley, AL2 1DR, UK
| | - Graeme L Close
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Tom Reilly Building, Byrom Street, Liverpool, L3 3AF, UK.
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Yang L, Chen H, Zhao M, Peng P. Prognostic value of circulating vitamin D binding protein, total, free and bioavailable 25-hydroxy vitamin D in patients with colorectal cancer. Oncotarget 2018; 8:40214-40221. [PMID: 28388568 PMCID: PMC5522208 DOI: 10.18632/oncotarget.16597] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 03/13/2017] [Indexed: 12/15/2022] Open
Abstract
Numerous studies have suggested that there was a significantly positive association between circulating total 25-hydroxyvitamin D (25(OH)D) and survival in colorectal cancer patients. Moreover, plasma vitamin D was also found significantly associated with the concentration of vitamin D binding protein (VDBP). However, there was no paper to clarify the prognostic value of VDBP, free and bioavailable 25(OH)D in colorectal carcinogenesis. The aim of this study was to comprehensively assess the prognostic value of VDBP, total, free and bioavailable 25(OH)D in stage I-III colorectal cancer patients. A total of 206 colorectal cancer patients were enrolled in this prospective study. Preoperative plasma total 25(OH)D and VDBP concentrations were measured by direct enzyme-linked immunosorbent assay, and albumin concentration was measured by Beckman automatic biochemical analyzer. Free and bioavailable 25(OH)D concentrations were calculated based on the concentrations of plasma VDBP, total 25(OH) D and albumin. X-title program was used to determine the optimal cut-off values of VDBP, total, free and bioavailable 25(OH)D. Results showed that elevated free and bioavailable 25(OH)D were significantly associated with better 5-year overall survival (OS) by univariate analysis. By multivariate cox analysis, we also found that the high level of free 25(OH)D (HR = 0.442, 95%CI = 0.238–0.819, P < 0.010) could be identified as an independent factor for better OS. In conclusion, our study suggested that higher levels of free and bioavailable 25(OH)D were associated with better OS in stage I-III colorectal cancer patients. Moreover, free 25(OH)D could be considered as an independent prognostic biomarker for OS.
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Affiliation(s)
- Lin Yang
- Department of Gastroenterology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Hong Chen
- Department of Gastroenterology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Miao Zhao
- Department of Gastroenterology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
| | - Peng Peng
- Department of Gastroenterology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu, China
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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11
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Degerud E, Nygård O, de Vogel S, Hoff R, Svingen GFT, Pedersen ER, Nilsen DWT, Nordrehaug JE, Midttun Ø, Ueland PM, Dierkes J. Plasma 25-Hydroxyvitamin D and Mortality in Patients With Suspected Stable Angina Pectoris. J Clin Endocrinol Metab 2018; 103:1161-1170. [PMID: 29325121 DOI: 10.1210/jc.2017-02328] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 01/04/2018] [Indexed: 02/13/2023]
Abstract
CONTEXT AND OBJECTIVE Vitamin D status may affect cardiovascular disease (CVD) development and survival. We studied the relationship between concentrations of the circulating biomarker 25-hydroxyvitamin D (25OHD) and all-cause and cardiovascular mortality risk. DESIGN, SETTING, PARTICIPANTS, AND MAIN OUTCOME MEASURES 25OHD, the sum of 25-hydroxyvitamin D3 and 25-hydroxyvitamin D2, was analyzed in plasma samples from 4114 white patients suspected of having stable angina pectoris and was adjusted for seasonal variation. Hazard ratios (HRs) for all-cause and cardiovascular mortality were estimated by using multivariable Cox models with 25OHD as the main exposure variable, with adjustment for study site, age, sex, smoking, body mass index, estimated glomerular filtration rate, and systolic blood pressure. RESULTS A total of 895 (21.8%) deaths, including 407 (9.9%) from CVD causes, occurred during a mean ± standard deviation follow-up of 11.9 ± 3.0 years. Compared with the first 25OHD quartile, HRs in the second, third, and fourth quartiles were 0.64 [95% confidence interval (CI), 0.54 to 0.77], 0.56 (95% CI, 0.46 to 0.67), and 0.56 (95% CI, 0.46 to 0.67) for all-cause mortality and 0.70 (95% CI, 0.53 to 0.91), 0.60 (95% CI, 0.45 to 0.79), and 0.57 (95% CI, 0.43 to 0.75) for cardiovascular mortality, respectively. Threshold analysis demonstrated increased all-cause and CVD mortality in patients with 25OHD concentrations below ∼42.5 nmol/L. Moreover, analysis suggested increased all-cause mortality at concentrations >100 nmol/L. CONCLUSION Plasma 25OHD concentrations were inversely associated with cardiovascular mortality and nonlinearly (U-shaped) associated with all-cause mortality.
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Affiliation(s)
- Eirik Degerud
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Ottar Nygård
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - Stefan de Vogel
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - Rune Hoff
- Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Gard Frodahl Tveitevåg Svingen
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - Eva Ringdal Pedersen
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - Dennis Winston Trygve Nilsen
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Department of Cardiology, Stavanger University Hospital, Stavanger, Norway
| | - Jan Erik Nordrehaug
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | | | - Per Magne Ueland
- Department of Clinical Science, University of Bergen, Bergen, Norway
- Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway
| | - Jutta Dierkes
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
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12
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Abstract
INTRODUCTION Low levels of 25-hydroxyvitamin D (25(OH)D) has been associated with many negative health outcomes including falls and fractures. 25(OH)D is largely bound to vitamin D binding protein (VDBP). There is increasing evidence that free or bioavailable 25(OH)D may be a better measure of vitamin D deficiency. OBJECTIVE To determine the prevalence of 25(OH)D deficiency and VDBP levels in multi-ethnic population, and its impact on muscle strength. DESIGN AND METHODS Cross-sectional study of older adults in Western region of Singapore. 295 participants from three ethnic groups were selected from the Healthy Older People Everyday (HOPE) cohort for measurements of total 25(OH)D and VDBP levels. Total 25(OH)D, VDBP, frailty status, Timed-Up-and-Go (TUG) and grip strength (GS) were assessed. Albumin, free and bioavailable 25(OH)D were only available for 256 participants. RESULTS 53% of Malay and 55% of Indians were deficient in 25(OH)D compared with 18.2% of ethnic Chinese participants. Chinese also had higher total 25(OH)D concentrations with a mean of 29.1 ug/l, (p = <0.001). Chinese had the lowest level of VDBP (169.6ug/ml) followed by Malay (188.8 ug/ml) and Indian having the highest (220.1 ug/ml). Calculated bioavailable and free 25(OH)D levels were significantly higher in Chinese, followed by Malays and Indians, which also correlated with better grip strength measures amongst the Chinese. CONCLUSION The Malays and Indians had overall lower free, bioavailable and total 25(OH)D compared with ethnic Chinese. Chinese ethnic group also had the lowest VDBP and better overall grip strength.
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Affiliation(s)
- R A Merchant
- A/Prof Reshma A Merchant, Division of Geriatric Medicine, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, , Tel: 67795555
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13
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Abstract
Vitamin D testing is part of laboratory practice since more than 30 years but has become a routine parameter only recently, due to a highly increasing amount of research in the field resulting in new clinical applications. Vitamin D actually represents a family of molecules of which 25OH Vitamin D and 1,25(OH)2 Vitamin D, under their D3 and D2 forms, are the most important to date. Physical detection methods and immunoassays exist for both molecules and are being reviewed and discussed. New developments in the measurement of C3-epi-25OH Vitamin D, 24,25(OH)2 Vitamin D, and free/bioavailable 25OH Vitamin D are also presented. The future of Vitamin D testing is considered based on the evolution of laboratories and based on the scientific research that is currently performed.
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Affiliation(s)
- N Heureux
- DIAsource Immunoassays, Louvain-la-Neuve, Belgium.
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14
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Altinova AE, Ozkan C, Akturk M, Gulbahar O, Yalcin M, Cakir N, Toruner FB. Vitamin D-binding protein and free vitamin D concentrations in acromegaly. Endocrine 2016; 52:374-9. [PMID: 26547217 DOI: 10.1007/s12020-015-0789-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 10/26/2015] [Indexed: 12/22/2022]
Abstract
Free 25-hydroxyvitamin D [25(OH)D] is suggested to be important in the determination of vitamin D deficiency, since vitamin D-binding protein (VDBP) may affect total 25(OH)D levels. There are no data about free 25(OH)D concentrations in acromegaly. We aimed to investigate serum VDBP and total and free 25(OH)D levels in patients with acromegaly in comparison with control subjects. We recruited 54 patients with acromegaly and 32 control subjects who were similar according to age, gender, and body mass index. Serum VDBP levels were found to be increased in patients with acromegaly compared to control subjects [90.35 (72.45-111.10) vs. 69.52 (63.89-80.13) mg/l, p = 0.001]. There was statistically no significant difference in serum total 25(OH)D levels between the patients with acromegaly and control subjects [18.63 (13.35-27.73) vs. 22.51 (19.20-28.96) ng/ml, p = 0.05]. Free 25(OH)D levels were significantly decreased in patients with acromegaly compared to control subjects [14.55 (10.45-21.45) vs. 17.75 (15.30-23.75) pg/ml, p = 0.03]. Free 25(OH)D levels correlated positively with total 25(OH)D (p = 0.0001) and HDL cholesterol (p = 0.04) and negatively with fasting blood glucose (p = 0.04). Our findings indicate that VDBP is increased and free 25(OH)D is decreased in acromegaly, while there is no significant alteration in total 25(OH)D.
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Affiliation(s)
- Alev Eroglu Altinova
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey
| | - Cigdem Ozkan
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey.
| | - Mujde Akturk
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey
| | - Ozlem Gulbahar
- Department of Biochemistry, Gazi University Faculty of Medicine, Ankara, Turkey
| | - Muhittin Yalcin
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey
| | - Nuri Cakir
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey
| | - Fusun Balos Toruner
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey
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15
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Abstract
CONTEXT African Americans have a lower total serum 25-hydroxyvitamin D [25(OH)D] but superior bone health. This has been referred to as a paradox. A recent publication found that free serum 25(OH)D is the same in black and white individuals. However, the study was criticized because an indirect method was used to measure free 25(OH)D. A direct method has recently been developed. OBJECTIVE We hypothesized that although total serum 25(OH)D is lower in African Americans, free serum 25(OH)D measured directly would not differ between races. DESIGN White and black healthy postmenopausal women were matched for age and body mass index. Serum total 25(OH)D, PTH, 1,25-dihydroxyvitamin D, vitamin D binding protein (VDBP), and bone density were measured. Measurement of free 25(OH)D was carried out using an ELISA. SETTING The study was conducted at an ambulatory research unit in a teaching hospital. OUTCOME A cross-racial comparison of serum free 25(OH)D was performed. RESULTS A propensity match resulted in the selection of a total of 164 women. Total 25(OH)D was lower in black women (19.5 ± 4.7 vs 26.9 ± 6.4 ng/mL), but a direct measurement of free 25(OH)D revealed almost identical values (5.25 ± 1.2 vs 5.25 ± 1.3 ng/mL) between races. VDBP was significantly lower in blacks when using a monoclonal-based ELISA but higher with a polyclonal-based ELISA. Serum PTH, 1,25-dihydroxyvitamin D, and bone density were higher in African Americans. CONCLUSIONS Free serum 25(OH)D is the same across races despite the lower total serum 25(OH)D in black women. Results comparing VDBP between races using a monoclonal vs a polyclonal assay were discordant.
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Affiliation(s)
- John Aloia
- Winthrop University Hospital, Mineola, New York 11501
| | | | | | - Albert Shieh
- Winthrop University Hospital, Mineola, New York 11501
| | - Gianina Usera
- Winthrop University Hospital, Mineola, New York 11501
| | | | - Louis Ragolia
- Winthrop University Hospital, Mineola, New York 11501
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16
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Chou CH, Chuang LY, Lu CY, Guh JY. Vitamin D-binding protein is required for the protective effects of vitamin D in renal fibroblasts and is phosphorylated in diabetic rats. Mol Cell Endocrinol 2015; 411:67-74. [PMID: 25911112 DOI: 10.1016/j.mce.2015.04.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 03/28/2015] [Accepted: 04/13/2015] [Indexed: 01/13/2023]
Abstract
Serum vitamin D is bound to vitamin D-binding protein (DBP). We studied the roles of DBP in streptozotocin-diabetic rats and high glucose (HG)-cultured cells. In diabetic rat sera, there was one upregulated (with a lower isoelectric point [pI], phosphorylated at S268, S270, S464 and T269) and one downregulated (with a higher pI, phosphorylated at S454 and S457) DBP. DBP levels with lower pI were increased in diabetic rat kidney and liver. HG (30 mM) increased DBP protein expression in NRK-49F cells and Clone-9 hepatocytes. HG decreased pI of DBP in Clone-9 hepatocytes. Moreover, DBP short hairpin ribonucleic acid attenuated 1,25-(OH)2D3-induced attenuation of HG-induced renin (but not collagen IV and fibronectin) protein expression in NRK-49F cells. Thus, DBP level is increased whereas DBP is phosphorylated in diabetic rat serum. HG increased DBP protein expression in renal fibroblasts and hepatocytes. Moreover, DBP is required for vitamin D-induced attenuation of HG-induced renin in NRK-49F cells.
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Affiliation(s)
- Chi-Hsien Chou
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Taiwan
| | - Lea-Yea Chuang
- Department of Biochemistry, College of Medicine, Kaohsiung Medical University, Taiwan.
| | - Chi-Yu Lu
- Department of Biochemistry, College of Medicine, Kaohsiung Medical University, Taiwan
| | - Jinn-Yuh Guh
- Department of Internal Medicine, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Taiwan; Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Taiwan.
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17
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Kalousova M, Dusilova-Sulkova S, Zakiyanov O, Kostirova M, Safranek R, Tesar V, Zima T. Vitamin D Binding Protein Is Not Involved in Vitamin D Deficiency in Patients with Chronic Kidney Disease. Biomed Res Int 2015; 2015:492365. [PMID: 26064917 DOI: 10.1155/2015/492365] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/26/2015] [Indexed: 01/22/2023]
Abstract
Objective. This study was designed to evaluate vitamin D status with separate determination of 25-OH D2 and 25-OH D3 and its relationship to vitamin D binding protein (VDBP) in patients with chronic kidney disease (CKD) and long-term haemodialysis patients (HD). Methods. 45 CKD patients, 103 HD patients, and 25 controls (C) were included. Plasma vitamin D concentrations were determined using chromatography and VDBP in serum and urine in CKD using enzyme immunoassay. Results. Plasma vitamin D levels were lower in CKD (30.16 ± 16.74 ng/mL) and HD (18.85 ± 15.85 ng/mL) versus C (48.72 ± 18.35 ng/mL), P < 0.0001. 25-OH D3 was the dominant form of vitamin D. Serum VDBP was higher in CKD (273.2 ± 93.8 ug/mL) versus C (222 ± 87.6 ug/mL) and HD (213.8 ± 70.9 ug/mL), P = 0.0003. Vitamin D/VDBP ratio was the highest in C and the lowest in HD; however, there was no correlation between vitamin D and VDBP. Urinary concentration of VDBP in CKD (0.25 ± 0.13 ug/mL) correlated with proteinuria (r = 0.43, P = 0.003). Conclusions. Plasma levels of vitamin D are decreased in CKD patients and especially in HD patients. 25-OH D3 was the major form of vitamin D. Despite urinary losses of VDBP, CKD patients had higher serum VDBP concentrations, indicating compensatory enhanced production. Vitamin D binding protein is not involved in vitamin D deficiency.
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18
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Ying HQ, Sun HL, He BS, Pan YQ, Wang F, Deng QW, Chen J, Liu X, Wang SK. Circulating vitamin D binding protein, total, free and bioavailable 25-hydroxyvitamin D and risk of colorectal cancer. Sci Rep 2015; 5:7956. [PMID: 25609140 PMCID: PMC4302314 DOI: 10.1038/srep07956] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 12/24/2014] [Indexed: 11/29/2022] Open
Abstract
Epidemiological investigation have suggested that there is a significantly inverse association between circulating 25-hydroxyvitamin D (25(OH)D) and the risk for developing colorectal cancer (CRC) in humans. However, little is known about the role of vitamin D binding protein (VDBP) in colorectal carcinogenesis. Blood samples were collected from 212 CRC patients and 212 controls matched with age, gender and blood collection time. We used logistic regression to calculate the odds ratios and 95% confidence intervals for further estimation of the association of the quartiles of VDBP, total, free and bioavailable 25(OH)D with CRC risk. The results revealed that there was no significant association between circulating VDBP concentrations and CRC in the present study, and that a negative association existed between total 25(OH)D and the risk of CRC, which was unchanged after adjustment for VDBP. Higher levels of free and bioavailable 25(OH)D were significantly associated with decreased risk of CRC. After stratifying by VDBP, high levels of total, free and bioavailable 25(OH)D were associated significantly with decreased CRC risk among participants with circulating VDBP below the median. These findings indicate that VDBP is not directly associated with the risk of CRC, but it modulates circulating free and bioavailable 25(OH)D concentration.
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Affiliation(s)
- Hou-Qun Ying
- 1] Medical college, Southeast University, Nanjing 210009, Jiangsu, China [2] Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
| | - Hui-Ling Sun
- 1] Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China [2] College of Life Sciences, Nanjing Normal University, Nanjing 210006, Jiangsu, China
| | - Bang-Shun He
- Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
| | - Yu-Qin Pan
- Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
| | - Feng Wang
- Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
| | - Qi-Wen Deng
- Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
| | - Jie Chen
- 1] Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China [2] College of Life Sciences, Nanjing Normal University, Nanjing 210006, Jiangsu, China
| | - Xian Liu
- Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
| | - Shu-Kui Wang
- 1] Medical college, Southeast University, Nanjing 210009, Jiangsu, China [2] Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, Jiangsu, China
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20
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Higashi T, Goto A, Morohashi M, Ogawa S, Komatsu K, Sugiura T, Fukuoka T, Mitamura K. Development and validation of a method for determination of plasma 25-hydroxyvitamin D3 3-sulfate using liquid chromatography/tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 969:230-4. [DOI: 10.1016/j.jchromb.2014.08.027] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 08/22/2014] [Accepted: 08/24/2014] [Indexed: 11/24/2022]
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21
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Anic GM, Weinstein SJ, Mondul AM, Männistö S, Albanes D. Serum vitamin D, vitamin D binding protein, and risk of colorectal cancer. PLoS One 2014; 9:e102966. [PMID: 25036524 PMCID: PMC4103858 DOI: 10.1371/journal.pone.0102966] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 06/26/2014] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND We previously reported a positive association between serum 25-hydroxyvitamin D (25(OH)D) and colorectal cancer risk. To further elucidate this association, we examined the molar ratio of 25(OH)D to vitamin D binding protein (DBP), the primary 25(OH)D transport protein, and whether DBP modified the association between 25(OH)D and colorectal cancer risk. METHODS In a nested case-control study within the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study, controls were 1∶1 matched to 416 colorectal cancer cases based on age and date of blood collection. Logistic regression was used to estimate odds ratios (ORs) and 95% confidence intervals (CI) for quartiles of 25(OH)D, DBP, and the molar ratio of 25(OH)D:DBP, a proxy for free, unbound circulating 25(OH)D. RESULTS Comparing highest to lowest quartiles, DBP was not associated with colorectal cancer risk (OR = 0.91; 95% CI: 0.58, 1.42, p for trend = 0.58); however, a positive risk association was observed for the molar ratio of 25(OH)D:DBP (OR = 1.44; 95% CI: 0.92, 2.26, p for trend = 0.04). In stratified analyses, the positive association between 25(OH)D and colorectal cancer was stronger among men with DBP levels above the median (OR = 1.89; 95% CI: 1.07, 3.36, p for trend = 0.01) than below the median (OR = 1.20; 95% CI: 0.68, 2.12, p for trend = 0.87), although the interaction was not statistically significant (p for interaction = 0.24). CONCLUSION Circulating DBP may influence the association between 25(OH)D and colorectal cancer in male smokers, with the suggestion of a stronger positive association in men with higher DBP concentrations. This finding should be examined in other populations, especially those that include women and non-smokers.
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Affiliation(s)
- Gabriella M. Anic
- Cancer Prevention Fellowship Program, Division of Cancer Prevention, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
- Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
| | - Stephanie J. Weinstein
- Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Alison M. Mondul
- Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Satu Männistö
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
| | - Demetrius Albanes
- Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
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22
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Abstract
CONTEXT We hypothesized that, similar to the coordinated homeostatic regulation of most hormones, the concentration of free and bioavailable 25-hydroxyvitamin D [25(OH)D] will be tightly controlled by total 25(OH)D and vitamin D binding protein (VDBP) and that the VDBP concentrations will be associated with insulin resistance status. OBJECTIVE Our primary objective was to investigate associations between total, free, and bioavailable 25(OH)D and VDBP. We also evaluated the relationships of VDBP with insulin resistance indices. STUDY DESIGN The study design was cross-sectional in the setting of a university children's hospital. The relative concentration of bioavailable 25(OH)D to total 25(OH)D [bioavailable 25(OH)D/total 25(OH)D was expressed as a percentage [percentage bioavailable 25(OH)D]. RESULTS Subjects were 47, postmenarchal, female adolescents, with a mean age of 15.8±1.4 years, a mean body mass index of 23.1±4.0 kg/m2. The total 25(OH)D was strongly associated with VDBP (rho=0.57, P<.0001). At lower total 25(OH)D concentrations, the concentration of bioavailable 25(OH)D relative to total 25(OH)D was higher (23.8% vs 14.9%, P<.0001), whereas the relative concentration of free 25(OH)D was similar (P=.44). VDBP was inversely associated with fasting insulin (rho=-0.51, P=.0003) and homeostatic model assessment of basal insulin resistance (rho=-0.45, P=.002) and positively with whole-body insulin sensitivity (rho=0.33, P=.02); these relationships persisted after adjusting for percentage fat and attenuated after adjusting for race. CONCLUSION Our data suggest that VDBP concentrations are regulated by total 25(OH)D levels to maintain adequate concentrations of bioavailable 25(OH)D. VDBP concentrations are inversely associated with hyperinsulinemia and insulin resistance.
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Affiliation(s)
- Ambika P Ashraf
- Division of Pediatric Endocrinology (A.P.A., X.W.), Department of Pediatrics, Center for Clinical and Translational Sciences (C.H.), and Department of Nutrition Sciences (B.A.G.), University of Alabama, Birmingham, Birmingham, Alabama 35233; and Division of Endocrinology (J.A.A.), Emory University School of Medicine, Atlanta, Georgia 30322
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Higashi T, Hijikuro M, Yamagata K, Ogawa S. Overestimation of salivary 25-hydroxyvitamin D3 level when using stimulated saliva with gum-chewing. Steroids 2013; 78:884-7. [PMID: 23688971 DOI: 10.1016/j.steroids.2013.05.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 04/26/2013] [Accepted: 05/08/2013] [Indexed: 12/19/2022]
Abstract
BACKGROUND The measurement of 25-hydroxyvitamin D3 [25(OH)D3] in whole saliva can be a noninvasive tool for assessing vitamin D status. Gum-chewing increases salivation and is often used to collect an adequate sample volume of saliva within a shorter time. The aim of this study was to clarify whether the concentration of 25(OH)D3 in whole saliva is influenced by gum-chewing. METHODS Stimulated saliva was collected from healthy volunteers chewing a tasteless and flavorless chewing gum after unstimulated saliva was collected without gum-chewing. The salivary 25(OH)D3 and albumin concentrations were measured. RESULTS The salivary 25(OH)D3 concentration was reproducibly measured when saliva was collected without gum-chewing, whereas the concentration was significantly increased by gum-chewing (p<0.05, paired t-test). One of the causes for the gum-chewing-induced increase in the 25(OH)D3 concentration may be the increased amount of protein-bound 25(OH)D3 in whole saliva. CONCLUSION Stimulated saliva by gum-chewing should be used with caution in the measurement of 25(OH)D3. The protein binding rate in plasma is a significant consideration when predicting whether the salivary concentration of a compound is varied by gum-chewing.
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Affiliation(s)
- Tatsuya Higashi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
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24
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Porter A, Gilmartin C, Srisakul U, Arruda J, Akkina S. Prevalence of 25-OH vitamin D deficiency in a population of hemodialysis patients and efficacy of an oral ergocalciferol supplementation regimen. Am J Nephrol 2013; 37:568-74. [PMID: 23735861 DOI: 10.1159/000351185] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 04/06/2013] [Indexed: 01/08/2023]
Abstract
BACKGROUND/AIMS Optimal dosing regimens for 25-OH vitamin D (VitD) deficiency are unknown in hemodialysis (HD) patients. Our aim was to evaluate the efficacy of prescribing ergocalciferol supplementation based on KDOQI guidelines for chronic kidney disease (CKD) stages III-IV in HD patients. METHODS We conducted a retrospective study of 96 urban, predominately African-American HD patients at a single-center dialysis unit with VitD insufficiency or deficiency treated with ergocalciferol. Patients were classified as either compliant or non-compliant with supplementation as determined by review of pharmacy records. The primary outcome was VitD levels 6 months after initiation of treatment and secondary outcomes were VitD levels at 11 months, bone/mineral and anemia parameters. RESULTS The population was predominately African-American (69%) and Hispanic (28%). There were 61 individuals in the compliant group and 35 individuals in the non-compliant group. The compliant group was older but otherwise similar in demographics and co-morbid conditions to the non-compliant group. After 6 months of treatment, the compliant group had a significant increase in VitD level (14.7 ± 6.0 to 28.7 ± 10.0 ng/ml, p < 0.0001) compared to the non-compliant group (14.7 ± 5.5 to 14.8 ± 7.1 ng/ml, p = 0.95). There were no differences in the incidence of hypercalcemia between the two groups. Except for a decrease in phosphorus in the compliant group (5.6 ± 1.6 to 4.9 ± 1.7 mg/dl, p = 0.004), there were no significant difference in bone/mineral or anemia parameters including dosing of darbepoetin. CONCLUSION An ergocalciferol-prescribing strategy using the KDOQI guidelines for stage III-IV kidney disease in HD patients with VitD deficiency or insufficiency is inadequate to achieve repletion or maintenance of normal VitD levels.
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Affiliation(s)
- Anna Porter
- Department of Medicine, University of Illinois Hospital and Health Sciences System, Chicago, Ill., USA
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Kühn T, Kaaks R, Becker S, Eomois PP, Clavel-Chapelon F, Kvaskoff M, Dossus L, Tjønneland A, Olsen A, Overvad K, Chang-Claude J, Lukanova A, Buijsse B, Boeing H, Trichopoulou A, Lagiou P, Bamia C, Masala G, Krogh V, Sacerdote C, Tumino R, Mattiello A, Buckland G, Sánchez MJ, Menéndez V, Chirlaque MD, Barricarte A, Bueno-de-Mesquita HB, van Duijnhoven FJ, van Gils CH, Bakker MF, Weiderpass E, Skeie G, Brustad M, Andersson A, Sund M, Wareham N, Khaw KT, Travis RC, Schmidt JA, Rinaldi S, Romieu I, Gallo V, Murphy N, Riboli E, Linseisen J. Plasma 25-hydroxyvitamin D and the risk of breast cancer in the European prospective investigation into cancer and nutrition: A nested case-control study. Int J Cancer 2013; 133:1689-700. [DOI: 10.1002/ijc.28172] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 02/07/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Tilman Kühn
- Division of Cancer Epidemiology; German Cancer Research Center DKFZ; Heidelberg; Germany
| | - Rudolf Kaaks
- Division of Cancer Epidemiology; German Cancer Research Center DKFZ; Heidelberg; Germany
| | | | - Piia-Piret Eomois
- Division of Cancer Epidemiology; German Cancer Research Center DKFZ; Heidelberg; Germany
| | | | | | | | - Anne Tjønneland
- Institute of Cancer Epidemiology, Danish Cancer Society; Copenhagen; Denmark
| | - Anja Olsen
- Institute of Cancer Epidemiology, Danish Cancer Society; Copenhagen; Denmark
| | - Kim Overvad
- Section for Epidemiology, Department of Public Health; Aarhus University; Aarhus; Denmark
| | - Jenny Chang-Claude
- Division of Cancer Epidemiology; German Cancer Research Center DKFZ; Heidelberg; Germany
| | - Annekatrin Lukanova
- Division of Cancer Epidemiology; German Cancer Research Center DKFZ; Heidelberg; Germany
| | - Brian Buijsse
- Department of Epidemiology; German Institute of Human Nutrition (DIfE) Potsdam-Rehbrücke; Nuthetal; Germany
| | - Heiner Boeing
- Department of Epidemiology; German Institute of Human Nutrition (DIfE) Potsdam-Rehbrücke; Nuthetal; Germany
| | | | | | - Christina Bamia
- WHO Collaborating Center for Food and Nutrition Policies, Department of Hygiene, Epidemiology and Medical Statistics; University of Athens Medical School; Athens; Greece
| | - Giovanna Masala
- Molecular and Nutritional Epidemiology Unit; Cancer Research and Prevention Institute-ISPO; Florence; Italy
| | - Vittorio Krogh
- Epidemiology and Prevention Unit; Fondazione IRCCS Istituto Nazionale dei Tumori; Milano; Italy
| | | | - Rosario Tumino
- Cancer Registry and Histopathology Unit; “Civile - M.P.Arezzo” Hospital ASP; Ragusa; Italy
| | - Amalia Mattiello
- Dipartimento di Medicina Clinica e Chirurgia; Federico II University; Naples; Italy
| | - Genevieve Buckland
- Unit of Nutrition, Environment and Cancer, Cancer Epidemiology Research Programme; Catalan Institute of Oncology (ICO-IDIBELL); Barcelona; Spain
| | | | | | | | | | | | | | - Carla H. van Gils
- Julius Center for Health Sciences and Primary Care; University Medical Center; Utrecht; The Netherlands
| | - Marije F. Bakker
- Julius Center for Health Sciences and Primary Care; University Medical Center; Utrecht; The Netherlands
| | | | - Guri Skeie
- Department of Community Medicine, Faculty of Health Sciences; University of Tromsø; Tromsø; Norway
| | - Magritt Brustad
- Department of Community Medicine, Faculty of Health Sciences; University of Tromsø; Tromsø; Norway
| | - Anne Andersson
- Department of Radiation Sciences; Umeå University; Umeå; Sweden
| | - Malin Sund
- Department of Surgery and Perioperative Sciences; Umeå University; Umeå; Sweden
| | - Nick Wareham
- MRC Epidemiology Unit; Institute of Metabolic Science; Cambridge; United Kingdom
| | - Kay Tee Khaw
- Department of Public Health and Primary Care; University of Cambridge; Cambridge; United Kingdom
| | - Ruth C. Travis
- Cancer Epidemiology Unit, Nuffield Department of Clinical Medicine; University of Oxford; Oxford; United Kingdom
| | - Julie A. Schmidt
- Cancer Epidemiology Unit, Nuffield Department of Clinical Medicine; University of Oxford; Oxford; United Kingdom
| | - Sabina Rinaldi
- Nutrition and Metabolism Section; International Agency for Research on Cancer, IARC; Lyon; France
| | - Isabelle Romieu
- Nutrition and Metabolism Section; International Agency for Research on Cancer, IARC; Lyon; France
| | | | - Neil Murphy
- School of Public Health; Imperial College London; London; United Kingdom
| | - Elio Riboli
- School of Public Health; Imperial College London; London; United Kingdom
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26
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Affiliation(s)
- Lahbib AÏDA
- Laboratory of Integrative Physiology, Faculty of Sciences of Bizerte, Carthage University, Jarzouna, Tunisia
| | - Lecomte FRÉDÉRIC
- Laboratory of Analytical Chemistry, CIRM, Institute of Pharmacy, University of Liège, CHU, B36, Tour 4, Avenue de l’Hôpital 1, B-4000 Liège, Belgium
| | - Ghodbane SOUMAYA
- Laboratory of Integrative Physiology, Faculty of Sciences of Bizerte, Carthage University, Jarzouna, Tunisia
| | - Hubert PHILIPPE
- Laboratory of Analytical Chemistry, CIRM, Institute of Pharmacy, University of Liège, CHU, B36, Tour 4, Avenue de l’Hôpital 1, B-4000 Liège, Belgium
| | - Sakly MOHSEN
- Laboratory of Integrative Physiology, Faculty of Sciences of Bizerte, Carthage University, Jarzouna, Tunisia
| | - Abdelmelek HAFEDH
- Laboratory of Integrative Physiology, Faculty of Sciences of Bizerte, Carthage University, Jarzouna, Tunisia
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