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1,25-dihydroxyvitamin d

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https://www.readbyqxmd.com/read/28795340/vertebral-fractures-assessed-with-dual-energy-x-ray-absorptiometry-in-patients-with-addison-s-disease-on-glucocorticoid-and-mineralocorticoid-replacement-therapy
#1
Valentina Camozzi, Corrado Betterle, Anna Chiara Frigo, Veronica Zaccariotto, Martina Zaninotto, Erica De Caneva, Paola Lucato, Walter Gomiero, Silvia Garelli, Chiara Sabbadin, Monica Salvà, Miriam Dalla Costa, Marco Boscaro, Giovanni Luisetto
PURPOSE: to assess bone damage and metabolic abnormalities in patients with Addison's disease given replacement doses of glucocorticoids and mineralocorticoids. METHODS: A total of 87 patients and 81 age-matched and sex-matched healthy controls were studied. The following parameters were measured: urinary cortisol, serum calcium, phosphorus, creatinine, 24-h urinary calcium excretion, bone alkaline phosphatase, parathyroid hormone, serum CrossLaps, 25 hydroxyvitamin D, and 1,25 dihydroxyvitamin D...
August 9, 2017: Endocrine
https://www.readbyqxmd.com/read/28768837/vitamin-d-in-the-spectrum-of-prediabetes-and-cardiovascular-autonomic-dysfunction
#2
REVIEW
Rumyana Dimova, Tsvetalina Tankova, Nevena Chakarova
Vitamin D is a fat-soluble secosteroid hormone with pleiotropic effects. 1,25-Dihydroxyvitamin D coordinates the biosynthesis of neurotransmitters in the central nervous system, which regulate cardiovascular autonomic function and may explain its putative role in the development of cardiovascular autonomic neuropathy (CAN). CAN is an independent risk factor for mortality in patients with diabetes and prediabetes and is associated with an increased risk of developing type 2 diabetes and cardiovascular disease...
August 2, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28768705/effects-of-vitamin-d2-supplementation-on-vitamin-d3-metabolism-in-health-and-ckd
#3
Zona Batacchi, Cassianne Robinson-Cohen, Andrew N Hoofnagle, Tamara Isakova, Bryan Kestenbaum, Kevin J Martin, Myles S Wolf, Ian H de Boer
BACKGROUND AND OBJECTIVES: Vitamin D supplements are prescribed to correct low circulating concentrations of 25-hydroxyvitamin D. In CKD, vitamin D metabolism is complicated by decreased conversion of 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D by CYP27B1 and possibly decreased conversion of 25-hydroxyvitamin D to 24,25-dihydroxyvitamin D by CYP24A1. The aim of this study was to determine the effects of vitamin D2 supplementation on vitamin D metabolism in health and CKD. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We conducted a treatment-only intervention study of 25 individuals with CKD (eGFR<60 ml/min per 1...
August 2, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28765038/synergistic-effect-of-1%C3%AE-25-dihydroxyvitamin-d3-and-17%C3%AE-estradiol-on-osteoblast-differentiation-of-pediatric-mscs
#4
Jing Li, Bonnie L Padwa, Shuanhu Zhou, Julia Mullokandova, Meryl S LeBoff, Julie Glowacki
Vitamin D is essential for mineral homeostasis and contributes to bone metabolism by stimulating osteoblast differentiation of marrow stromal cells (MSCs). In this study, we used MSCs from pre-pubertal girls and boys to test the hypothesis that 1α,25(OH)2D and 17β-estradiol have synergistic effects on these MSCs, and what mechanism is involved. With IRB approval, we isolated MSCs from discarded excess iliac marrow graft from children undergoing alveolar cleft repair. Plasma was available from 8 female (9...
July 29, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28765037/vitamin-d-effects-on-monocytes%C3%AC-ccl-2-il6-and-cd14-transcription-in-addison-s-disease-and-hla-susceptibility
#5
A U Kraus, M Penna-Martinez, G Meyer, K Badenhoop
Addisońs disease is a rare autoimmune disorder leading to adrenal insufficiency and life-long glucocorticoid dependency. Vitamin D receptor (VDR) polymorphisms and vitamin D deficiency predispose to Addisońs disease. Aim of the current study was, to investigate potential anti-inflammatory vitamin D effects on monocytes in Addisońs disease, focusing on inflammatory CCL-2 and IL6, as well on monocyte CD14 markers. Addisońs disease is genetically linked to distinct HLA susceptibility alleles. Therefore we analyzed, whether HLA genotypes differed for vitamin D effects on monocyte markers...
July 29, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28757397/low-utility-of-serum-25-hydroxyvitamin-d3-and-1-25-dihydroxyvitamin-d3-in-predicting-peripheral-treg-and-th17-cell-counts-in-esrd-and-renal-transplant-patients
#6
Mostafa G Aly, Li Zhu, Rolf Weimer, Gerhard Opelz, Christian Morath, Ruben Kuon, Mohammed Tohamy, Gamal Saadi, Mona Soliman, Walaa Ibrahim, Volker Daniel
BACKGROUND: Vitamin D has shown an immune-modulatory effect in different studies. Vitamin D stimulates Tregs and inhibits Th17 cells. The immune-modulatory role of vitamin D in chronic kidney disease (CKD) and renal transplant patients is unclear. We measured whether different serum levels of vitamin D were associated with an increased or decreased presence of lymphocyte subsets including Treg and Th17 cells in end-stage renal disease (ESRD) and renal transplant recipients. METHODS: Eighty-seven renal transplant recipients and 53 end-stage renal disease (ESRD) patients were enrolled in this study...
July 27, 2017: Transplant Immunology
https://www.readbyqxmd.com/read/28756682/vitamin-d-status-and-kidney-function-decline-in-hiv-infected-men-a-longitudinal-study-in-the-multicenter-aids-cohort-study-macs
#7
Adrienne Tin, Long Zhang, Michelle M Estrella, Andrew Hoofnagle, Casey Rebholz, Todd Brown, Frank J Palella, Mallory D Witt, Lisa Jacobson, Lawrence Kingsley, Alison Abraham
Vitamin D may play an important role in a range of disease processes. In the general population, lower vitamin D levels have been associated with kidney dysfunction. HIV-infected populations have a higher risk of chronic kidney disease. Few studies have examined the link between lower vitamin D levels and kidney function decline among HIV-infected persons. We investigated the associations of serum 25-hydroxyvitamin D [25(OH)D] and 1,25-dihydroxyvitamin D [1,25(OH)2D] with kidney function decline in a cohort of HIV-infected white and black men under HAART treatment in the vitamin D ancillary study of the Multicenter AIDS Cohort Study (MACS)...
July 31, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28741469/interlaboratory-comparison-for-the-determination-of-24-25-dihydroxyvitamin-d%C3%A2-in-human-serum-using-liquid-chromatography-with-tandem-mass-spectrometry
#8
Stephen Wise, Susan Tai, Michael Nelson, Carolyn Burdette, Johanna Camara, Andrew Hoofnagle, Thomas Laha, Graham Carter, Julia Jones, Emma Williams, Zoe Barclay, Glenville Jones, Martin Kaufmann, Neil Binkley, Amita Kapoor, Toni Ziegler, Kevin Cashman, Kirsten Dowling, Christopher Sempos
Six laboratories associated with the Vitamin D Standardization Program (VDSP) participated in an interlaboratory comparison of LC with tandem MS (MS/MS) methods for the determination of 24,25-dihydroxyvitamin D₃ [24,25(OH)₂D₃] in human serum. The laboratories analyzed two different serum-based Standard Reference Materials (SRMs) intended for use in the determination of 25-hydroxyvitamin D and 30 samples from the Vitamin D External Quality Assessment Scheme (DEQAS). All laboratory methods for 24,25(OH)₂D₃ were based on isotope dilution LC-MS/MS; three of the methods used derivatization of the vitamin D metabolites before LC-MS/MS...
July 24, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28741468/development-of-standard-reference-material-srm-2973-vitamin-d-metabolites-in-frozen-human-serum-high-level
#9
Susan Tai, Michael Nelson, Mary Bedner, Brian Lang, Karen Phinney, Lane Sander, James Yen, Joseph Betz, Christopher Sempos, Stephen Wise
The National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of Health Office of Dietary Supplements and the Vitamin D Standardization Program, has recently issued a new serum-matrix Standard Reference Material (SRM): 2973 Vitamin D Metabolites in Frozen Human Serum (High Level). SRM 2973 was designed to provide a serum material with a total 25-hydroxyvitamin D [25(OH)D] concentration near 100 nmol/L to complement the existing serum-based SRMs with values assigned for total 25(OH)D between 20 and 80 nmol/L...
July 24, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28737765/adrenocorticotropic-hormone-and-1-25-dihydroxyvitamin-d3-enhance-human-osteogenesis-in-vitro-by-synergistically-accelerating-the-expression-of-bone-specific-genes
#10
Irina L Tourkova, Li Liu, Nareerat Sutjarit, Quitterie C Larrouture, Jianhua Luo, Lisa J Robinson, Harry C Blair
To improve definition of the physical and hormonal support of bone formation, we studied differentiation of human osteoblasts in vitro at varying combinations of ACTH, 1α,25-dihydroxyvitamin D3 (1,25(OH)2D), and extracellular calcium, with and without added cortisol. Bone mineralization, alkaline phosphatase activity, and osteoblast-specific markers RunX2, osterix, and collagen I increased with 10 pM ACTH, 10 nM 1,25(OH)2D, or at 2 mM calcium with important synergistic activity of combinations of any of these stimuli...
July 24, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28729125/comparative-effects-of-vitamin-d-and-methylprednisolone-against-ischemia-reperfusion-injury-of-rabbit-spinal-cords
#11
Bora Gürer, Abdullah Karakoç, Pınar Kuru Bektaşoğlu, Hayri Kertmen, Mehmet Ali Kanat, Ata Türker Arıkök, Berrin İmge Ergüder, Mustafa Fevzi Sargon, Özden Çağlar Öztürk, Erhan Çelikoğlu
INTRODUCTION: Recent studies have demonstrated the neuroprotective and immunomodulatory effects of 1,25-dihydroxyvitamin D3 (calcitriol), but no previous study has examined these effects on spinal cord ischemia/reperfusion (I/R) injury. Therefore, the present study aimed to evaluate whether calcitriol protects the spinal cord from I/R injury. METHODS: Rabbits were randomized into four groups of eight animals: group 1 (laparotomy control), group 2 (ischemia control), group 3 (30mg/kg intraperitoneal methylprednisolone at surgery), and group 4 (0...
July 18, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28720522/patients-with-non-ambulatory-cerebral-palsy-have-higher-sclerostin-levels-and-lower-bone-mineral-density-than-patients-with-ambulatory-cerebral-palsy
#12
Yoon-Kyum Shin, Young Kwon Yoon, Kyung Bae Chung, Yumie Rhee, Sung-Rae Cho
Bone loss is a serious clinical issue in patients with cerebral palsy (CP). Sclerostin has garnered interest as a key mechanosensor in osteocytes, leading to considerations of the therapeutic utilization of anti-sclerostin medications. This study was undertaken to determine associations among mechanical unloading, sclerostin levels, and bone imbalance in patients with CP. A total of 28 patients with CP participated in this cross-sectional study. The following measurements were taken: anthropometrics, clinical diagnosis of CP subtype and ambulatory status, bone mineral density (BMD) z-scores at the lumbar spine and hip, and blood biochemical markers, including sclerostin, parathyroid hormone (PTH), osteocalcin, C-terminal telopeptide, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D, creatinine, calcium, and phosphorus...
July 15, 2017: Bone
https://www.readbyqxmd.com/read/28716760/properties-of-purified-cyp2r1-in-a-reconstituted-membrane-environment-and-its-25-hydroxylation-of-20-hydroxyvitamin-d3
#13
Chloe Y S Cheng, Tae-Kang Kim, Saowanee Jeayeng, Andrzej T Slominski, Robert C Tuckey
Recent studies indicate that CYP2R1 is the major 25-hydroxylase catalyzing the first step in vitamin D activation. Since the catalytic properties of CYP2R1 have been poorly studied to date and it is a membrane protein, we examined the purified enzyme in a membrane environment. CYP2R1 was expressed in E. coli and purified by nickel affinity- and hydrophobic interaction-chromatography and assayed in a reconstituted membrane system comprising phospholipid vesicles plus purified human NADPH-P450 oxidoreductase...
July 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28713755/tumor-induced-osteomalacia-a-sherlock-holmes-approach-to-diagnosis-and-management
#14
G V Chanukya, Manoj Mengade, Jagadishwar Goud, I Satish Rao, Anuj Jain
Tumor-induced osteomalacia (TIO) is a subtype of paraneoplastic syndrome associated with hypophosphatemia due to renal phosphate wasting in adults. The humoral factor responsible for clinical picture known as fibroblast growth factor 23 (FGF23) is most often secreted by benign yet elusive mesenchymal tumors, difficult to localize, access, and excise completely; rarely, they are multiple and malignant. Paradoxical inappropriately normal or low levels of 1,25-dihydroxyvitamin D in the setting of hypophosphatemia is due to suppressive effect of FGF23...
January 2017: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28707894/vitamin-d-receptor-regulates-amyloid-beta-1-42-production-with-protein-disulfide-isomerase-a3
#15
Duygu Gezen-Ak, Irem L Atasoy, Esin Candas, Merve Alaylioglu, Selma Yilmazer, Erdinc Dursun
The challenge of understanding the biology of neuronal amyloid processing could provide a basis for understanding the amyloid pathology in Alzheimer's disease (AD). Based on our previous studies we have suggested that AD might be the consequence of a hormonal imbalance in which the critical hormone is vitamin D. The present study primarily focused on the creation of a condition that prevents the genomic or non-genomic action of vitamin D by disrupting vitamin D receptors (VDR or PDIA3/1,25MARRS); the effects of these disruptions on the series of proteins involved in secretases that play a crucial role in amyloid pathology and on amyloid beta (Aβ) production in primary cortical neurons were observed...
July 14, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28699886/interleukin-1-inhibition-chronic-kidney-disease-mineral-and-bone-disorder-and-physical-function%C3%A2
#16
Kristen L Nowak, Adriana Hung, Talat Alp Ikizler, Heather Farmer-Bailey, Natjalie Salas-Cruz, Sudipa Sarkar, Andrew Hoofnagle, Zhiying You, Michel Chonchol
OBJECTIVE: Epidemiologic studies have suggested a link between chronic systemic inflammation and chronic kidney disease-mineral and bone disorder (CKD-MBD). Additionally, declining renal function is associated with worsening physical and cognitive function, which may potentially be explained by systemic inflammation, CKD-MBD, or both. We hypothesized that inhibiting inflammation with an interleukin-1 (IL-1) trap would improve markers of CKD-MBD as well as physical/cognitive function in patients with moderate-to-severe CKD...
July 12, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28698609/functional-analyses-of-a-novel-missense-and-other-mutations-of-the-vitamin-d-receptor-in-association-with-alopecia
#17
Mayuko Tamura, Michiyasu Ishizawa, Tsuyoshi Isojima, Samim Özen, Akira Oka, Makoto Makishima, Sachiko Kitanaka
Hereditary 1,25-dihydroxyvitamin D-resistant rickets (HVDRR) is a rare disorder, caused by bialellic mutations of the vitamin D receptor (VDR) gene, sometimes associated with alopecia. The aim of this study is to elucidate the mechanism of functional disruption of a novel mutation, detected in a patient with HVDRR, comparing to other mutations with or without alopecia. The patient was a 2-year-old girl with alopecia, who was clinically diagnosed as HVDRR. Genetic analysis revealed a novel homozygous mutation, S360P, located in ligand binding domain (LBD)...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28690912/atypical-skeletal-manifestations-of-rickets-in-a-familial-hypocalciuric-hypercalcemia-patient
#18
Bo Wu, Ou Wang, Yan Jiang, Mei Li, Xiaoping Xing, Weibo Xia
Familial hypocalciuric hypercalcemia (FHH) is caused by inactivating mutations in the calcium-sensing receptor (CaSR) gene. The loss of function of CaSR presents with rickets as the predominant skeletal abnormality in mice, but is rarely reported in humans. Here we report a case of a 16-year-old boy with FHH who presented with skeletal manifestations of rickets. To identify the possible pathogenic mutation, the patient was evaluated clinically, biochemically, and radiographically. The patient and his family members were screened for genetic mutations...
2017: Bone Research
https://www.readbyqxmd.com/read/28670298/in-vitro-differentiation-of-preosteoblast-like-cells-mc3t3-e1-to-adipocytes-is-enhanced-by-1-25-oh-2-vitamin-d3
#19
Elisha Pendleton, Nalini Chandar
Osteoblasts and adipocytes originate from common mesenchymal progenitor cells and are controlled by specific transcription factors. While 1,25-dihydroxyvitamin D3 (vitamin D) is known to be an important factor for osteoblast differentiation, there are conflicting reports regarding its effect on adipogenesis. In this study, we attempted to understand the effect of exposure of preosteoblasts (MC3T3-E1) to adipogenic media with and without vitamin D and determined the expression of adipogenic genes during this process...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28669663/1-25-oh-2-vitamin-d-3-contributes-to-osteoclast-like-trans-differentiation-of-malignant-plasma-cells
#20
Paola Cafforio, Stella D'Oronzo, Claudia Felici, Sandra Sigala, Martina Fragni, Francesco Silvestris
1,25-dihydroxyvitamin D (1,25(OH)2D) exerts pleiotropic effects including bone turnover and immune system regulation. It inhibits both T and B cell proliferation while decreasing the secretion of inflammatory cytokines and immunoglobulins. 1,25(OH)2D also modulates monocyte-macrophage and osteoclast (OC) maturation. Since we have previously described that malignant plasma cells may trans-differentiate towards the myeloid lineage participating to skeletal devastation in multiple myeloma (MM), we here evaluated in vitro the role of 1,25(OH)2D in this lineage switch...
June 29, 2017: Experimental Cell Research
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