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Amber A Bokhari, Laura R Lee, Dewayne Raboteau, Jane Turbov, Isabel V Rodriguez, J Wesley Pike, Chad A Hamilton, G Larry Maxwell, Gustavo C Rodriguez, Viqar Syed
Here, we evaluated the expression of CYP24A1, a protein that inactivates vitamin D in tissues. CYP24A1 expression was increased in advanced-stage endometrial tumors compared to normal tissues. Similarly, endometrial cancer cells expressed higher levels of CYP24A1 than immortalized endometrial epithelial cells. RT-PCR and Western blotting were used to examine CYP24A1 mRNA and protein levels in endometrial cancer cells after 8, 24, 72, and 120 h of exposure to progesterone, progestin derivatives and calcitriol, either alone or in combination...
October 18, 2016: Oncotarget
David Jarrard, Badrinath Konety, Wei Huang, Tracy Downs, Jill Kolesar, Kyung Mann Kim, Tom Havighurst, Joel Slaton, Margaret G House, Howard L Parnes, Howard H Bailey
INTRODUCTION AND OBJECTIVES: Prostate cancer (PCa) represents an important target for chemoprevention given its prolonged natural history and high prevalence. Epidemiologic and laboratory data suggest that vitamin D and genistein (soy isoflavone) may decrease PCa progression. The effect of vitamin D on prostate epithelial cell proliferation and differentiation is well documented and genistein may augment this affect through inhibition of the CYP24 enzyme, which is responsible for intracellular vitamin D metabolism...
2016: American Journal of Clinical and Experimental Urology
E Corden, E Higgins, C Smith
A 55-year-old man with severe plaque psoriasis presented with a 2-week history of feeling generally unwell with lethargy and thirst. His symptoms had developed 6 weeks after commencement of the topical vitamin D3 analogue calcitriol. Investigations revealed hypercalcaemia and acute-on-chronic kidney injury, probably directly induced by systemic absorption of vitamin D3 following extensive topical use. Topical calcitriol had been started as a steroid-sparing agent to reduce the patient's liberal potent corticosteroid usage during anti-tumour necrosis factor-alfa therapy...
October 20, 2016: Clinical and Experimental Dermatology
Paige M Kulling, Kristine C Olson, Thomas L Olson, David J Feith, Thomas P Loughran
Commonly known for its critical role in calcium homeostasis and bone mineralization, more recently vitamin D has been implicated in haematological cancer pathogenesis and shows promise as an anti-cancer therapy. Serum levels of 25(OH)D3 , the precursor to the active form of vitamin D, calcitriol, are typically lower in patients with haematological disease compared to healthy individuals. This often correlates with worse disease outcome. Furthermore, diseased cells typically highly express the vitamin D receptor (VDR), which is required for many of the anti-cancer effects observed in multiple in vivo and in vitro cancer models...
October 15, 2016: European Journal of Haematology
Richard X Davey
BACKGROUND: The misnamed 'vitamin' D is actually the hormone calcitriol (1,25 dihydroxyhydroxyvitamin D). It has a central regulatory role in calcium metabolism, and more widely in the immune system. The prohormone calcifediol (25 hydroxyvitamin D) is more easily measured in the laboratory and is the analyte used in reference interval formulation. Being highly lipid soluble, both calcifediol and calcitriol travel in the bloodstream on carriage proteins, principally on vitamin D binding protein, DBP...
October 13, 2016: Annals of Clinical Biochemistry
Weibin Zhou, Min Chen
INTRODUCTION: Parathyroid crisis due to ectopic parathyroid adenomas can pose diagnostic and management challenges, since it is quite rare in clinical practice. CLINICAL FINDINGS/PATIENT CONCERNS: A 67-year-old Chinese male presented as a parathyroid crisis due to an ectopic mediastinal parathyroid adenoma with his serum calcium and PTH markedly increased in short time. An ultrasonography and computed tomography (CT) scan of the neck did not reveal any parathyroid adenoma...
October 2016: Medicine (Baltimore)
Fabiana Gatti de Menezes, Rodrigo Martins Abreu, Alexander Itria
Introduction: Secondary hyperparathyroidism (SHPT) is a consequence of chronic kidney disease. The treatment at the Brazilian Unified Heath System (SUS) is performed with calcitriol, a drug which favors hypercalcemia and/or hyperphosphatemia, hindering the control of SHPT. Another option is paricalcitol, which causes parathormone (PTH) suppression faster than calcitriol, with minor changes in calcium-phosphorus product and calcium and phosphorus serum levels. Objective: This study aims to develop a cost-effectiveness analysis of paricalcitol versus calcitriol for patients in dialytic treatment with SHPT, from the SUS perspective...
July 2016: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
Cameron C Wick, Sharon J Lin, Heping Yu, Cliff A Megerian, Qing Yin Zheng
HYPOTHESIS: Phosphorus and vitamin D (calcitriol) supplementation in the Phex mouse, a murine model for endolymphatic hydrops (ELH), will improve otic capsule mineralization and secondarily ameliorate the postnatal development of ELH and sensorineural hearing loss (SNHL). BACKGROUND: Male Phex mice have X-linked hypophosphatemic rickets (XLH), which includes osteomalacia of the otic capsule. The treatment for XLH is supplementation with phosphorus and calcitriol...
September 28, 2016: American Journal of Otolaryngology
Hamid Lorvand Amiri, Shahram Agah, Javad Tolouei Azar, Sharieh Hosseini, Farzad Shidfar, Seyedeh Neda Mousavi
BACKGROUND & AIMS: Despite evidence for beneficial effects of vitamin D, to our knowledge, no study has compared the effects of calcium supplementation with vitamin D on non-alcoholic fatty liver disease (NAFLD) regression during a hypo-energetic program. We compared the effect of the vitamin D supplementation with and without calcium on anthropometric measures and biochemical parameters in NAFLD patients during a weight-loss program. METHODS: A 12-week, randomized, controlled, double-blind trial was conducted in 120 NAFLD patients randomly assigned to receive 25 μg calcitriol (n = 37), 500 mg calcium carbonate + 25 μg calcitriol (n = 37), or placebo (n = 36) every day with their lunch meals while following a weight-loss program...
September 28, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
Kristine C Olson, Paige M Kulling, Thomas L Olson, Su-Fern Tan, Rebecca J Rainbow, David J Feith, Thomas P Loughran
Large granular lymphocyte leukemia (LGLL) is a rare incurable chronic disease typically characterized by clonal expansion of CD3+ cytotoxic T-cells. Two signal transducer and activator of transcription factors, STAT1 and STAT3, are constitutively active in T-LGLL. Disruption of this activation induces apoptosis in T-LGLL cells. Therefore, considerable efforts are focused on developing treatments that inhibit STAT activation. Calcitriol, the active form of vitamin D, has been shown to decrease STAT1 and STAT3 phosphorylation in cancer cell lines and autoimmune disease mouse models...
October 7, 2016: Cancer Biology & Therapy
Shunsuke Goto, Hideki Fujii, Keiji Kono, Kentaro Watanabe, Kentaro Nakai, Shinichi Nishi
Fibroblast growth factor 23 (FGF23) is regulated by sustained phosphate supplementation and restriction. However, few studies have investigated FGF23 levels in patients with Fanconi syndrome. Therefore, we evaluated intact and C-terminal FGF23 and FGF23-associated parameters in four patients with Fanconi syndrome. Serum intact and C-terminal FGF23 levels were extremely low. Although serum phosphate and 1,25-dihydroxyvitamin D levels improved to or above the normal range within 1 year of treatment with oral phosphate and calcitriol, serum FGF23 levels remained low...
October 2016: Clinical Kidney Journal
Giuseppe Cianciolo, Mario Cozzolino
During the last decade, a new view into the molecular mechanisms of chronic kidney disease-mineral bone disorder (CKD-MBD) has been proposed, with fibroblast growth factor 23 (FGF23) as a novel player in the field. Enhanced serum FGF23 levels cause a reduction in serum phosphate, together with calcitriol suppression and consequent hyperparathyroidism (HPT). In contrast, reduced serum FGF23 levels are associated with hyperphosphatemia, higher calcitriol levels and parathyroid hormone (PTH) suppression. In addition, serum FGF23 levels are greatly increased and positively correlated with serum phosphate levels in CKD patients...
October 2016: Clinical Kidney Journal
Zhe Wei, Jin-Wei He, Wen-Zhen Fu, Zhen-Lin Zhang
CONTEXT: Adefovir dipivoxil (ADV) was an important cause of adult-onset hypophosphatemic osteomalacia. However, its clinical characteristics and mechanisms have not been well defined. OBJECTIVE: The objective of the study was to summarize the clinical characteristics of ADV-induced osteomalacia and to explore the association between ADV-associated tubulopathy and polymorphisms in genes encoding drug transporters. DESIGN, SETTING, PATIENTS, AND MAIN OUTCOME MEASURE: Seventy-six affected patients were clinically studied...
September 21, 2016: Bone
Marta Pelczyńska, Teresa Grzelak, Marcelina Walczak, Krystyna Czyżewska
In recent years, attention has been focused on pleiotropic directions of effects exerted by vitamin D. Epidemiological data indicate that deficiency of vitamin D in various population groups represents an increasingly widespread phenomenon, while a decreased serum concentration of calcitriol correlates with manifestation of civilization-linked diseases, including visceral obesity. This study aims at a review and synthesis of data linked to relationships between lowered vitamin D concentrations in blood and manifestation of obesity, and potential mechanisms which affect the concentration of the vitamin in conditions of an excessive accumulation of adipose tissue...
September 2016: Annals of Agricultural and Environmental Medicine: AAEM
S Cheng, W Y So, D Zhang, Q Cheng, B J Boucher, P S Leung
OBJECTIVES: The present study was designed to investigate the effects of calcitriol (the active hormonal metabolite of vitamin D) on hepatic metabolic abnormalities in type 2 diabetes. METHODS: Type 2 diabetic db/db mice were used to investigate the effects of calcitriol on hepatic and systemic metabolic disorders. HepG2 cells cultured in insulin-resistant conditions were used to examine the potential mechanisms for calcitriol-induced changes in hepatic lipid and glucose metabolism...
September 20, 2016: Current Molecular Medicine
Anna Y Belorusova, Nanjoo Suh, Hong Jin Lee, Jae Young So, Hubert Maehr, Natacha Rochel
Gemini analogs of calcitriol, characterized by the extension of the C21-methyl group of calcitriol with a second chain, act as agonists of the vitamin D receptor (VDR). This second side chain of gemini is accommodated in a new cavity inside the VDR created by the structural rearrangement of the protein core. The resulting conformational change preserves the active state of the receptor and bestows gemini compounds with biological activities that exceed those of calcitriol. Of particular interest are gemini's anti-cancer properties, and in this study we demonstrate anti-proliferative and tumor-reducing abilities of BXL0124 and BXL0097, differing only by the presence or absence, respectively, of the methylene group on the A ring...
September 17, 2016: Journal of Steroid Biochemistry and Molecular Biology
Janice García-Quiroz, Rocío García-Becerra, Galia Lara-Sotelo, Euclides Avila, Sofía López, Nancy Santos-Martínez, Ali Halhali, David Ordaz-Rosado, David Barrera, Andrea Olmos-Ortiz, María J Ibarra-Sánchez, José Esparza-López, Fernando Larrea, Lorenza Díaz
Factors affecting vitamin D metabolism may preclude anti-carcinogenic effects of its active metabolite calcitriol. Chronic ethanol consumption is an etiological factor for breast cancer that affects vitamin D metabolism; however, the mechanisms underlying this causal association have not been fully clarified. Using a murine model, we examined the effects of chronic moderate ethanol intake on tumoral and renal CYP27B1 and CYP24A1 gene expression, the enzymes involved in calcitriol synthesis and inactivation, respectively...
September 14, 2016: Journal of Steroid Biochemistry and Molecular Biology
Hamid Lorvand Amiri, Shahram Agah, Seyedeh Neda Mousavi, Agha Fatemeh Hosseini, Farzad Shidfar
OBJECTIVE: Evidence indicates that NAFLD patients are vitamin D deficient. Vitamin D has new roles in lipid and glucose metabolism. The aim of this study was to examine the effects of calcitriol supplementation on the NAFLD progression based on liver lipid accumulation, serum lipid profile and insulin resistance. METHODS: We randomly assigned 73 patients with NAFLD-confirmed by ultra-sonography to 12 weeks of treatment with hypocaloric diet (reduction of 500 kcal per day) plus 25 µg of calcitriol supplement or a hypocaloric diet plus placebo...
September 2016: Archives of Iranian Medicine
Rita Sigüeiro, Rocio Otero, Patricia González-Berdullas, Julian Loureiro, Antonio Mouriño, Miguel A Maestro
A new approach to 19-nor-A-ring phosphine oxide 5 together with a convergent synthesis of the vitamin D3 analogue 1α,25-dihydroxy-19-norvitamin D3 (3) have been developed. The 19-nor-A-ring is constructed from (SR)-carvone. The triene system is assembled by a Wittig-Horner coupling.
August 31, 2016: Journal of Steroid Biochemistry and Molecular Biology
Emilio Martínez de Victoria
El calcio (Ca) es el elemento mineral más abundante en nuestro organismo, ya que forma parte importante del esqueleto y los dientes. Supone alrededor del 2% del peso corporal. Las funciones del calcio son: a) funciones esqueléticas y b) funciones reguladoras. El hueso está formado por una matriz proteica que se mineraliza de forma mayoritaria con calcio (el más abundante), fosfato y magnesio; para ello es imprescindible un correcto aporte dietético de Ca, fósforo y vitamina D. El Ca iónico (Ca2+) es un componente celular imprescindible para mantener y/o realizar las diferentes funciones especializadas de prácticamente todas las células del organismo...
July 12, 2016: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
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