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1,25-dihydroxyvitamin d

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https://www.readbyqxmd.com/read/29653103/sterol-regulatory-element-binding-protein-1-trans-activates-25-hydroxy-vitamin-d-3-24-hydroxylase-gene-expression-in-renal-proximal-tubular-cells
#1
Tomohiro Kagawa, Mina Kozai, Masashi Masuda, Nagakatsu Harada, Otoki Nakahashi, Mari Tajiri, Ryouhei Yoshikawa, Mari Nakao, Yuichiro Takei, Masayuki Iwano, Eiji Takeda, Yutaka Taketani, Hironori Yamamoto
The physiological activity of the steroid derived hormone vitamin D is regulated by several enzymatic steps. Both 25-hydroxy vitamin D3 1α-hydroxylase (CYP27B1) and 25-hydroxyvitamin D3 24-hydroxylase (CYP24A1) modulate blood levels of 1,25-dihydroxyvitamin D3 , an activated form of vitamin D. We previously demonstrated that CYP27B1 expression was trans-activated by sterol regulatory element binding protein 1 (SREBP1), although whether SREBP1 also regulates CYP24A1 transcription was unclear. Here we investigated the ability of SREBP1 to affect CYP24A1 transcription...
April 10, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29652819/the-when-what-how-of-measuring-vitamin-d-metabolism-in-clinical-medicine
#2
REVIEW
Niek F Dirks, Mariëtte T Ackermans, Paul Lips, Renate T de Jongh, Marc G Vervloet, Robert de Jonge, Annemieke C Heijboer
We now have the ability to measure a number of different vitamin D metabolites with very accurate methods. The most abundant vitamin D metabolite, 25-hydroxyvitamin D, is currently the best marker for overall vitamin D status and is therefore most commonly measured in clinical medicine. The added value of measuring metabolites beyond 25-hydroxyvitamin D, like 1,25-, and 24,25-dihydroxyvitamin D is not broadly appreciated. Yet, in some more complicated cases, these metabolites may provide just the information needed for a legitimate diagnosis...
April 13, 2018: Nutrients
https://www.readbyqxmd.com/read/29601566/-disturbances-of-calcium-metabolism-and-vitamin-d-supplementation-in-sarcoidosis-two-way-street
#3
REVIEW
Anna Kempisty, Anna Lewandowska, Jan Kuś
The role of vitamin D in the human body is not limited only to the regulation of calcium metabolism and secondary to the impact on bones. Recent studies have shown the influence of vitamin D level on muscles, on the risk of cancer, diabetes, hypertension and pulmonary diseases, including granulomatous diseases. Sarcoidosis is a granulomatous disease of unknown etiology. Hypercalcemia in the course of the disease occurs in up to 10% of cases in the consequence of autonomous overproduction of 1,25-dihydroxyvitamin D by macrophages of sarcoid granulomas...
March 27, 2018: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29599772/the-gut-microbiota-regulates-endocrine-vitamin-d-metabolism-through-fibroblast-growth-factor-23
#4
Stephanie A Bora, Mary J Kennett, Philip B Smith, Andrew D Patterson, Margherita T Cantorna
To determine the effect of the microbiota on vitamin D metabolism, serum 25-hydroxyvitamin D(25D), 24,25-dihydroxyvitamin D (24,25D), and 1,25-dihydroxyvitamin D (1,25D) were measured in germ-free (GF) mice before and after conventionalization (CN). GF mice had low levels of 25D, 24,25D, and 1,25D and were hypocalcemic. CN of the GF mice with microbiota, for 2 weeks recovered 25D, 24,25D, and 1,25D levels. Females had more 25D and 24,25D than males both as GF mice and after CN. Introducing a limited number of commensals (eight commensals) increased 25D and 24,25D to the same extent as CN...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29597237/vitamin-d-and-secondary-hyperparathyroid-states
#5
Cristiana Cipriani, Jessica Pepe, Luciano Colangelo, Salvatore Minisola
The interplay between vitamin D and parathyroid hormone (PTH) represents one of the most important metabolic mechanisms of regulation of the calcium/phosphorus homeostasis. Secondary hyperparathyroidism is therefore a major complication that arises as a result of reduced vitamin D levels, both as primary 25-hydroxy-vitamin D (25[OH]D) and/or 1,25-dihydroxyvitamin D (1,25[OH]2D) reduction. Different metabolic pathways are involved, as well as target organs and tissues, with several clinical complications. The skeleton is primarily involved, but many other extra-skeletal organs expressing the vitamin D and/or PTH receptors may theoretically be affected by vitamin D inadequacy and secondary hyperparathyroidism...
2018: Frontiers of Hormone Research
https://www.readbyqxmd.com/read/29597236/extra-skeletal-effects-of-vitamin-d
#6
Roger Bouillon
There are very solid data to confirm that the vitamin D endocrine system is important not only for calcium transport or bone homeostasis but also for operational functions in most cells of the body. Preclinical studies convincingly demonstrated coherent actions of the vitamin D endocrine system on the proliferation/differentiation of most cells (and thus possibly on the evolution of cancer). The most plausible target tissues include skeletal and cardiac muscle, all immune cells, many cells involved in cardiovascular homeostasis, brain cells, and reproductive tissues...
2018: Frontiers of Hormone Research
https://www.readbyqxmd.com/read/29597233/vitamin-d-assays
#7
Daniel D Bikle
The number of requests for vitamin D metabolite measurements has increased dramatically over the past decade leading commercial laboratories to develop rapid high throughput assays. The measurement of 25-hydroxyvitamin D (25[OH]D) and to a lesser extent 1,25-dihydroxyvitamin D (1,25[OH]2D) dominates these requests, but requests for multiple metabolite measurements in the same sample are also increasing. The most commonly used methods include immunoassays and liquid chromatography/mass spectrometry (LC-MS). Each method has its advantages and disadvantages, but with improvements in technology, especially in LC-MS, this method is gaining ascendance due to its greater precision and flexibility...
2018: Frontiers of Hormone Research
https://www.readbyqxmd.com/read/29594503/hyperphosphatemic-tumoral-calcinosis-caused-by-fgf23-compound-heterozygous-mutations-what-are-the-therapeutic-options-for-a-better-control-of-phosphatemia
#8
Debora Claramunt-Taberner, Aurélia Bertholet-Thomas, Marie-Christine Carlier, Frédérique Dijoud, Franck Chotel, Caroline Silve, Justine Bacchetta
BACKGROUND: Hyperphosphatemic familial tumoral calcinosis (HFTC) is a rare autosomal recessive disease caused by mutations in genes encoding FGF23 or its regulators, and leading to functional deficiency or resistance to fibroblast growth factor 23 (FGF23). Subsequent biochemical features include hyperphosphatemia due to increased renal phosphate reabsorption, and increased or inappropriately normal 1,25-dihydroxyvitamin D (1,25-D) levels. CASE-DIAGNOSIS/TREATMENT: A 15-year-old girl was referred for a 1...
March 28, 2018: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29581858/depleting-ovarian-cancer-stem-cells-with-calcitriol
#9
Amit Kumar Srivastava, Asim Rizvi, Tiantian Cui, Chunhua Han, Ananya Banerjee, Imrana Naseem, Yanfang Zheng, Altaf A Wani, Qi-En Wang
Cancer stem cells (CSCs) represent the root of many solid tumors including ovarian cancer. Eradication of CSCs represents a novel cancer therapeutic strategy. Calcitriol, also known as 1,25-dihydroxyvitamin D3 [1,25(OH)2 D3 ], is an active metabolite of vitamin D, functioning as a potent steroid hormone. Calcitriol has shown anti-tumor effects in various cancers by regulating multiple signaling pathways. It has been reported that calcitriol can regulate the properties of normal and CSCs. However, the effect of calcitriol on the ovarian cancer growth and ovarian CSCs is still unclear...
March 6, 2018: Oncotarget
https://www.readbyqxmd.com/read/29575997/1-25-oh-2d3-protects-trophoblasts-against-insulin-resistance-and-inflammation-via-suppressing-mtor-signaling
#10
Guanlin Li, Li Lin, Yan-Ling Wang, Huixia Yang
Gestational diabetes mellitus (GDM) is the primary cause of maternal and fetal morbidity and mortality. Insulin resistance (IR) is pivotal to GDM pathogenesis, and mammalian target of rapamycin (mTOR) is a critical regulator of GDM. An increasing amount of evidence indicates that vitamin D deficiency is a risk factor for GDM. However, there are few reports on the effect of IR on GDM placentas. The present study aims to verify that 1,25-dihydroxyvitamin D3 (1,25(OH)2 D3 ) can ameliorate trophoblast IR by suppressing mTOR signaling...
January 1, 2018: Reproductive Sciences
https://www.readbyqxmd.com/read/29575677/vitamin-d-analogues-tacalcitol-and-calcipotriol-inhibit-proliferation-and-migration-of-t98g-human-glioblastoma-cells
#11
Ida Emanuelsson, Kjell Wikvall, Tomas Friman, Maria Norlin
The active form of vitamin D (1α,25-dihydroxyvitamin D) acts as a steroid hormone and binds to the vitamin D receptor (VDR). This receptor is expressed in most cell types including cells in the CNS. Vitamin D has several functions in the body including effects on brain development, neuroprotection and immunological regulation. It has been shown that vitamin D has anti-proliferative activities in different cancer cell lines. Tacalcitol and calcipotriol are synthetic analogues of 1α,25-dihydroxyvitamin D with reduced effect on calcium metabolism...
March 25, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29573957/vitamin-d-improves-cardiac-function-after-myocardial-infarction-through-modulation-of-resident-cardiac-progenitor-cells
#12
Thi Y L Le, Masahito Ogawa, Eddy Kizana, Jenny E Gunton, James J H Chong
BACKGROUND: Vitamin D has been implicated in the prevention of heart failure. However the underlying mechanism remains unclear. We hypothesised that these effects may be partially mediated by cardiac stem/progenitor cells (CPCs). Therefore, we examined the effects of 1,25-dihydroxyvitamin D3 (1,25D) on cell cycle activity and differentiation of a previously described CPC population called cardiac colony-forming unit fibroblasts (cCFU-Fs). METHODS: cCFU-Fs were isolated from adult male C57Bl/6 mouse hearts using fluorescence-activated cell sorting...
February 3, 2018: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29560610/investigating-the-effect-of-testosterone-by-itself-and-in-combination-with-letrozole-on-1-25-dihydroxy-vitamin-d-and-fgf23-in-male-rats
#13
F Saki, S R Kasaee, F Sadeghian, F Koohpeyma, G H R Omrani
BACKGROUND: Testosterone deficiency might be associated with vitamin D levels in hypogonadal men, but it is not clear whether testosterone can affect vitamin D and fibroblast growth factor-23 (FGF23), either directly or indirectly via aromatization to estradiol. We aimed to investigate the role of testosterone on vitamin D metabolism and serum FGF23 in male rats. METHODS: A total of 48 male rats were divided into 4 equal groups: sham; O, orchiectomy; O + T, orchiectomized rats treated with testosterone; and O + T + L, orchiectomized rats treated with combination of testosterone and letrozole...
March 20, 2018: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/29553126/potential-use-of-1-25-dihydroxyvitamin-d-in-the-diagnosis-and-treatment-of-papillary-thyroid-cancer
#14
Ting Zhang, Hao Zhang, Liang He, Zhihong Wang, Wenwu Dong, Wei Sun, Ping Zhang
BACKGROUND Low levels of 1-25-dihydroxyvitamin D3 [1,25(OH)2D3] in serum may be a risk factor for several tumor types. Also, high cathelicidin antimicrobial peptide (CAMP) expression is regarded to be important against tumor progression. We evaluated the potential importance of 1,25(OH)2D3 in the diagnosis and treatment of papillary thyroid cancer (PTC). MATERIAL AND METHODS The preoperative serum level of 1,25(OH)2D3 was measured using a double-antibody sandwich enzyme-linked immunosorbent assay. Vitamin D3 receptor (VDR) expression was detected by streptavidin-peroxidase immunohistochemical staining in PTC specimens...
March 19, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29550140/comparison-of-0-46-calcium-diets-with-and-without-added-anions-with-a-0-7-calcium-anionic-diet-as-a-means-to-reduce-periparturient-hypocalcemia
#15
Jesse P Goff, Nicholas J Koszewski
Most studies demonstrating that diets with low dietary cation-anion difference (DCAD) reduce hypocalcemia in cows add enough anions to the diet to reduce urine pH below 7.0. One objective of these experiments was to determine whether there is any benefit to periparturient plasma Ca concentration if diet anion addition results in a lesser degree of acidification of the cow and urine pH does not go below 7.0. Another method for reducing hypocalcemia involves feeding a prepartal diet that is Ca deficient. This places the cow in negative Ca balance before calving, stimulating parathyroid hormone (PTH) and 1,25-dihydroxyvitamin D secretion before calving and thus promoting Ca homeostasis at calving...
March 14, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29548779/dialysis-as-a-treatment-option-for-a-patient-with-normal-kidney-function-and-familial-tumoral-calcinosis-due-to-a-compound-heterozygous-fgf23-mutation
#16
Patrícia T Goldenstein, Precil D Neves, Bruno E Balbo, Rosilene M Elias, Alexandre C Pereira, Luiz F Onuchic, Harald Jüppner, Vanda Jorgetti, Hugo Abensur, Rosa Maria Moysés
Primary tumoral calcinosis is a rare autosomal recessive disorder characterized by ectopic calcified tumoral masses. Mutations in 3 genes (GALNT3, FGF23, and KL) have been linked to this human disorder. We describe a case of a 28-year-old man with a history of painful firm masses over his right and left gluteal region, right clavicle region, knees, and left elbow. Biochemical analysis disclosed hyperphosphatemia (phosphate, 9.0 mg/dL) and normocalcemia (calcium, 4.8 mg/dL), with normal kidney function and fractional excretion of phosphate of 3%...
March 14, 2018: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/29538679/advanced-glycation-end-products-alter-steroidogenic-gene-expression-by-granulosa-cells-an-effect-partially-reversible-by-vitamin-d
#17
Z Merhi, E Buyuk, M J Cipolla
STUDY QUESTION: Does vitamin D attenuate the adverse effects of advanced glycation end products (AGEs) on steroidogenesis by human granulosa cells (GCs)? SUMMARY ANSWER: AGEs alter the expression of genes important in steroidogenesis while 1,25-dihydroxyvitamin D3 (vit D3) in vitro attenuates some of the actions of AGEs on steroidogenic gene expression, possibly by downregulating the expression of the pro-inflammatory cell membrane receptor for AGEs (RAGE). WHAT IS KNOWN ALREADY: Vitamin D attenuates the pro-inflammatory effects of AGEs in non-ovarian tissues...
March 12, 2018: Molecular Human Reproduction
https://www.readbyqxmd.com/read/29536989/corrigendum-1-25-dihydroxyvitamin-d-inhibits-lps-induced-high-mobility-group-box-1-hmgb1-secretion-via-targeting-the-nf-e2-related-factor-2-hemeoxygenase-1-hmgb1-pathway-in-macrophages
#18
Zebing Rao, Na Zhang, Ning Xu, Ying Pan, Mengjun Xiao, Junxian Wu, Hong Zhou, Shuo Yang, Yunzi Chen
[This corrects the article on p. 1308 in vol. 8, PMID: 29085368.].
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29535889/effects-of-1-25-dihydroxyvitamin-d-3-on-the-differentiation-of-mc3t3-e1-osteoblast-like-cells
#19
Hyun-Soo Kim, Mingzhen Zheng, Do-Kyung Kim, Won-Pyo Lee, Sang-Joun Yu, Byung-Ock Kim
Purpose: The purpose of this study was to evaluate the effects of 1,25-dihydroxyvitamin D3 on the proliferation, differentiation, and matrix mineralization of MC3T3-E1 osteoblast-like cells in vitro. Methods: MC3T3-E1 osteoblastic cells and 1,25-dihydroxyvitamin D3 were prepared. Cytotoxic effects and osteogenic differentiation were evaluated using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, alkaline phosphatase (ALP) activity assay, ALP staining, alizarin red S staining, and reverse transcription-polymerase chain reaction (RT-PCR) for osteogenic differentiation markers such as ALP, collagen type I (Col-I), osteocalcin (OCN), vitamin D receptor (VDR), and glyceraldehyde 3-phosphate dehydrogenase...
February 2018: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/29534438/expression-of-txnip-in-cancer-cells-and-regulation-by-1-25-oh-%C3%A2-d%C3%A2-is-it-really-the-vitamin-d%C3%A2-upregulated-protein
#20
Mohamed A Abu El Maaty, Fadi Almouhanna, Stefan Wölfl
Thioredoxin-interacting protein (TXNIP) was originally identified in HL-60 cells as the vitamin D₃ upregulated protein 1, and is now known to be involved in diverse cellular processes, such as maintenance of glucose homeostasis, redox balance, and apoptosis. Besides the initial characterization, little is known about if and how 1,25-dihydroxyvitamin D₃ [1,25(OH)₂D₃] induces TXNIP expression. We therefore screened multiple cancerous cell lines of different tissue origins, and observed induction, repression, or no change in TXNIP expression in response to 1,25(OH)₂D₃...
March 10, 2018: International Journal of Molecular Sciences
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