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1,25(OH)2D3

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https://www.readbyqxmd.com/read/29465363/inhibitory-effect-and-mechanism-of-1-25-dihydroxy-vitamin-d3-on-rankl-expression-in-fibroblast-like-synoviocytes-and-osteoclast-like-cell-formation-induced-by-il-22-in-rheumatoid-arthritis
#1
Hongyan Wen, Yang Liu, Jinchan Li, Dandan Wei, Dandan Liu, Fangfang Zhao
OBJECTIVES: To explore the inhibitory effect and mechanism of 1,25-dihydroxy vitamin D3 (l,25(OH)2D3) on receptor activator of nuclear factor-κB ligand (RANKL) expression in fibroblast-like synoviocytes (FLSs) and osteoclastogenesis induced by interleukin (IL)-22 in patients with rheumatoid arthritis (RA). METHODS: Fibroblast-like synoviocytes from patients with rheumatoid arthritis (RA-FLSs) were cultured and stimulated for RANKL expression with IL-22 in the absence or presence of various concentrations of l,25(OH)2D3, and JAK-2 inhibitor or p38 MAPK inhibitor at the optimised time point of IL-22 treatment...
February 15, 2018: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29425808/metabolism-of-2%C3%AE-2-tetrazol-2-yl-ethyl-1%C3%AE-25-dihydroxyvitamin-d-3-by-cyp24a1-and-biological-activity-of-its-24r-hydroxylated-metabolite
#2
Kaori Yasuda, Eri Tohyama, Masashi Takano, Atsushi Kittaka, Miho Ohta, Shinichi Ikushiro, Toshiyuki Sakaki
Our previous study revealed that the 2α-substituted vitamin D analog 2α-[2-(tetrazol-2-yl)ethyl]-1α,25(OH)2D3(AH-1) exhibited a higher osteocalcin promoter transactivation activity in human osteosarcoma cells and a greater effect on bone mineral density in a rat model of osteoporosis than 1α,25(OH)2D3 without increasing blood calcium concentration. Thus, we hypothesized that AH-1 could be a promising therapeutic agent for osteoporosis without any serious side effects. In this study, we compared the CYP24A1-dependent metabolism of AH-1 with that of 1α,25(OH)2D3...
February 6, 2018: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29420306/dose-dependent-effects-of-vitamin-1-25-oh-2d3-on-oxidative-stress-and-apoptosis
#3
Cagri Cakici, Turkan Yigitbasi, Sule Ayla, Hadi Karimkhani, Feyza Bayramoglu, Pakize Yigit, Ertugrul Kilic, Nesrin Emekli
Background The purpose of this study is to examine the dose-dependent effects of vitamin 1,25(OH)2D3 on apoptosis and oxidative stress. Methods In this study, 50 male Balb/c mice were used as control and experiment groups. The mice were divided into 5 groups each consisting of 10 mice. Calcitriol was intraperitoneally administered as low dose, medium dose, medium-high dose and high dose vitamin D groups (at 0.5, 1, 5 and 10 μg/kg, respectively), for three times a week during 14 days. At the end of the study, annexin V was measured by enzyme-linked immunosorbent assay method, and total antioxidant capacity and total oxidant status values were measured by colorimetric method in serum...
February 8, 2018: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/29416624/1-25-dihydroxyvitamin-d3-inhibits-the-proliferation-of-rat-mesangial-cells-induced-by-high-glucose-via-ddit4
#4
Da-Peng Chen, Ye-Ping Ma, Li Zhuo, Zheng Zhang, Gu-Ming Zou, Yue Yang, Hong-Mei Gao, Wen-Ge Li
1,25-Dihydroxyvitamin D3(1,25(OH)2 D3) is a secosteroid with antiproliferative property. It also plays a pivotal renoprotective role in diabetic nephropathy. We investigated whether 1,25(OH)2D3 could inhibit the proliferation of rat mesangial cells exposed to high glucose via the DNA-damage-inducible transcript 4/mammalian target of rapamycin(DDIT4/mTOR) pathway. The cell proliferation rate and cell cycle duration were measured using cell counting kit-8 assay and flow cytometry. Protein expression was assayed by Western blot...
January 2, 2018: Oncotarget
https://www.readbyqxmd.com/read/29403195/vitamin-d-and-gastrointestinal-cancer
#5
REVIEW
Ashish Mahendra, Karishma, Basanta Kumar Choudhury, Tamanna Sharma, Neha Bansal, Richa Bansal, Shivangi Gupta
Vitamin D serves as a precursor to the potent steroid hormone calcitriol, which has widespread actions throughout the body. Calcitriol regulates numerous cellular pathways that could have a role in determining cancer risk and prognosis. Low Vitamin D levels have been implicated in numerous disease processes including fracture risk, falls, cardiovascular disease, hypertension, diabetes mellitus, and cancers. Metabolite of 1, 25-dihydroxyvitamin D3 (1,25[OH]2D3) regulates numerous genes that control gut physiology and homeostasis...
January 2018: Journal of Laboratory Physicians
https://www.readbyqxmd.com/read/29402723/reduction-of-respiratory-infections-in-asthma-patients-supplemented-with-vitamin-d-is-related-to-increased-serum-il-10-and-ifn%C3%AE-levels-and-cathelicidin-expression
#6
E Ramos-Martínez, M R López-Vancell, J C Fernández de Córdova-Aguirre, J Rojas-Serrano, A Chavarría, A Velasco-Medina, G Velázquez-Sámano
BACKGROUND: Vitamin D is a molecule that modulates the immune response and shows anti-inflammatory effects that are beneficial for the control of chronic diseases such as asthma. The trial aim was to explore the effect of vitamin D supplementation on the colonization of pathogenic bacteria in the upper respiratory tract of allergic asthmatic patients. METHODS: This study was conducted in 86 patients between 18 and 50 years of age who were randomly divided into two groups...
February 2, 2018: Cytokine
https://www.readbyqxmd.com/read/29374760/partial-body-uv-exposure-in-chronic-kidney-disease-and-extrarenal-vitamin-d-metabolism
#7
Rolfdieter Krause, Rainer Stange, Heinz Jürgen Roth, Heinrich Kaase, Andreas Michalsen, Michael F Holick
BACKGROUND/AIM: Exposure of the skin to sunshine is the major natural source of vitamin D. In order to imitate this natural production of vitamin D for patients with chronic kidney disease, hemodialysis patients were exposed three times a week to radiation of the front part of both legs to normalize the vitamin D status. PATIENTS AND METHODS: Partial body UVB irradiation was performed during the routine dialysis session. Twenty-two patients took part, with a mean age of 61...
February 2018: Anticancer Research
https://www.readbyqxmd.com/read/29371396/the-cytochrome-p450-24a1-interaction-with-adrenodoxin-relies-on-multiple-recognition-sites-that-vary-among-species
#8
D Fernando Estrada
Mitochondrial cytochromes P450 (P450s) are responsible for important metabolic reactions, including steps involved in steroid and vitamin D metabolism. The mitochondrial P450 24A1 (CYP24A1) is responsible for deactivation of the bioactive form of vitamin D, 1,25(OH)2D3. Its function relies on formation of a P450-redox partner complex with the ferredoxin and electron donor adrenodoxin (Adx). However, very little is known about how the Adx-CYP24A1 complex forms. In this study, we report the results of solution NMR in which we monitor isotopically labeled full-length Adx as it binds CYP24A1 in complex with the P450 inhibitor clotrimazole...
January 25, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29351464/vitamin-d-and-regulation-of-vascular-cell-function
#9
Nasim Jamali, Christine M Sorenson, Nader Sheibani
Vitamin D deficiency is linked to pathogenesis of many diseases including cardiovascular, cancer, and various eye diseases. In recent years, important roles for vitamin D in regulation of immune function, inflammation, angiogenesis, and aging have been demonstrated. Thus, vitamin D and its analogs have been evaluated for treatment of various types of cancer and chronic diseases. We previously showed that the active form of vitamin D (1, 25(OH)2D3) is a potent inhibitor of angiogenesis. This activity is consistent with the important role proposed for vitamin D and its analogs in the mitigation of tumor growth through inhibition of angiogenesis...
December 22, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29345296/vitamin-d-derivatives-potentiate-the-anticancer-and-anti-angiogenic-activity-of-tyrosine-kinase-inhibitors-in-combination-with-cytostatic-drugs-in-an-a549-non-small-cell-lung-cancer-model
#10
Ewa Maj, Beata Filip-Psurska, Magdalena Milczarek, Mateusz Psurski, Andrzej Kutner, Joanna Wietrzyk
Numerous in vitro and in vivo studies have demonstrated that calcitriol [1,25(OH)2D3] and different vitamin D analogs possess antineoplastic activity, regulating proliferation, differentiation and apoptosis, as well as angiogenesis. Vitamin D compounds have been shown to exert synergistic effects when used in combination with different agents used in anticancer therapies in different cancer models. The aim of this study was to evaluate the mechanisms of the cooperation of the vitamin D compounds [1,24(OH)2D3 (PRI‑2191) and 1,25(OH)2D3] with tyrosine kinase inhibitors (imatinib and sunitinib) together with cytostatics (cisplatin and docetaxel) in an A549 non-small cell lung cancer model...
February 2018: International Journal of Oncology
https://www.readbyqxmd.com/read/29345249/effects-of-1-25-dihydroxyvitamin-d3-on-the-prevention-of-chronic-obstructive-pulmonary-disease-copd-in-rats-exposed-to-air-pollutant-particles-less-than-2-5-micrometers-in-diameter-pm2-5
#11
Lerong Chen, Xiaolan Yuan, Luru Zou, Jianping Peng, Xinchun Hu
BACKGROUND This study aimed to investigate the effects of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) on airway changes in chronic obstructive pulmonary disease (COPD) rats exposed to air pollutant particles less than 2.5 micrometers in diameter (PM2.5), and to evaluate the mechanisms. MATERIAL AND METHODS Three groups were included in this study: a normal group, a COPD model group, and a COPD with 1,25(OH)2D3 treatment group. In each group, the rats were divided into four subgroups: control and different doses of PM2...
January 18, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29317227/prolonged-exposure-to-1-25-oh-2d3-and-high-ionized-calcium-induces-fgf-23-production-in-intestinal-epithelium-like-caco-2-monolayer-a-local-negative-feedback-for-preventing-excessive-calcium-transport
#12
Mayuree Rodrat, Kannikar Wongdee, Nattapon Panupinthu, Jirawan Thongbunchoo, Jarinthorn Teerapornpuntakit, Nateetip Krishnamra, Narattaphol Charoenphandhu
Overdose of oral calcium supplement and excessive intestinal calcium absorption can contribute pathophysiological conditions, e.g., nephrolithiasis, vascular calcification, dementia, and cardiovascular accident. Since our previous investigation has indicated that fibroblast growth factor (FGF)-23 could abolish the 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]-enhanced calcium absorption, we further hypothesized that FGF-23 produced locally in the enterocytes might be part of a local negative feedback loop to regulate calcium absorption...
January 6, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29290431/targeting-antimicrobial-defenses-of-the-udder-through-an-intrinsic-cellular-pathway
#13
Corwin D Nelson, Kathryn E Merriman, Michael B Poindexter, Mercedes F Kweh, Leslie P Blakely
The bovine innate immune system has a strong repertoire of antimicrobial defenses to rapidly attack infectious pathogens that evade physical barriers of the udder. Exploration of the intracrine vitamin D pathway of bovine macrophages has improved understanding of the signals that initiate antimicrobial defenses that protect the udder. In the intracrine vitamin D pathway, pathogen recognition receptors upregulate CYP27B1 mRNA that encodes for the enzyme that converts 25-hydroxyvitamin D [25(OH)D3] to the active vitamin D hormone, 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]...
December 28, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29282249/phosphate-dependent-luminal-atp-metabolism-regulates-transcellular-calcium-transport-in-intestinal-epithelial-cells
#14
Atsushi Uekawa, Hitoki Yamanaka, Liesbet Lieben, Yoshifumi Kimira, Mariko Uehara, Yoko Yamamoto, Shigeaki Kato, Kosei Ito, Geert Carmeliet, Ritsuko Masuyama
Extracellular low phosphate strongly enhances intestinal calcium absorption independently of active vitamin D [1,25(OH)2D3] signaling, but the underlying mechanisms remain poorly characterized. To elucidate the phosphate-dependent regulation of calcium transport, we investigated part of the enteral environment that is involved in 1,25(OH)2D3-independent calcium absorption, which responds to dietary phosphate levels in mice that lack intestinal vitamin D receptor (Vdr) activity. Impaired calcium absorption in intestinal Vdr-null mice was improved by dietary phosphate restriction...
December 27, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29258892/enhanced-repair-of-uv-induced-dna-damage-by-1-25-dihydroxyvitamin-d-3-in-skin-is-linked-to-pathways-that-control-cellular-energy
#15
Mark Stephen Rybchyn, Warusavithana Gunawardena Manori De Silva, Vanessa Bernadette Sequeira, Bianca Yuko McCarthy, Anthony Vincent Dilley, Katie Marie Dixon, Gary Mark Halliday, Rebecca Sara Mason
Inadequately repaired post-UV DNA damage results in skin cancers. DNA repair requires energy but skin cells have limited capacity to produce energy after UV insult. We examined whether energy supply is important for DNA repair after UV exposure, in the presence of 1α,25-dihydroxyvitamin D3(1,25(OH)2D3), which reduces UV-induced DNA damage and photocarcinogenesis in a variety of models. After UV exposure of primary human keratinocytes, the addition of 1,25(OH)2D3increased unscheduled DNA synthesis, a measure of DNA repair...
December 16, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29250167/associations-between-abnormal-vitamin-d-metabolism-pathway-function-and-non-small-cell-lung-cancer
#16
Nan Ge, Xiu-Mei Chu, Yun-Peng Xuan, Dun-Qiang Ren, Yongjie Wang, Kai Ma, Hui-Jiang Gao, Wen-Jie Jiao
Lung cancer is a type of malignant tumor derived from the respiratory system, which is the leading cause of cancer-associated mortality worldwide, of which ~80% of cases are attributable to non-small cell lung cancer (NSCLC). A previous study demonstrated that 1α,25-Dihydroxyvitamin D3 (1α,25(OH)2D3), derived from the vitamin D metabolic pathway contributes an antitumor effect. Aberrant expression of the essential enzyme encoding genes, Cytochrome P450 Family 27 Subfamily A Member 1 (CYP27A1), Cytochrome P450 Family 27 Subfamily B Member 1 (CYP27B1), and Cytochrome P450 Family 24 Subfamily A Member 1 (CYP24A1) may be associated with lung cancer...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29237505/1-25-dihydroxyvitamin-d3-modulates-the-phenotype-and-function-of-monocyte-derived-dendritic-cells-in-cattle
#17
Yolanda Corripio-Miyar, Richard J Mellanby, Katy Morrison, Tom N McNeilly
BACKGROUND: The active form of the vitamin D3, 1,25-Dihydroxyvitamin D3 (1,25-(OH)2D3) has been shown to have major effects not only on physiological processes but also on the regulation of the immune system of vertebrates. Dendritic cells are specialised antigen presenting cells which are in charge of the initiation of T-cell dependant immune responses and as such are key regulators of responses towards pathogens. In this study we set out to evaluate the effects of 1,25-(OH)2D3 on the phenotype of cattle monocyte-derived dendritic cells (MoDCs) and how the conditioning with this vitamin affects the function of these myeloid cells...
December 13, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29233620/regulation-of-extracellular-matrix-vesicles-via-rapid-responses-to-steroid-hormones-during-endochondral-bone-formation
#18
REVIEW
Niels Asmussen, Zhao Lin, Michael J McClure, Zvi Schwartz, Barbara D Boyan
Endochondral bone formation is a precise and highly ordered process whose exact regulatory framework is still being elucidated. Multiple regulatory pathways are known to be involved. In some cases, regulation impacts gene expression, resulting in changes in chondrocyte phenotypic expression and extracellular matrix synthesis. Rapid regulatory mechanisms are also involved, resulting in release of enzymes, factors and micro RNAs stored in extracellular matrisomes called matrix vesicles. Vitamin D metabolites modulate endochondral development via both genomic and rapid membrane-associated signaling pathways...
December 9, 2017: Steroids
https://www.readbyqxmd.com/read/29225815/hypercalcaemia-preceding-diagnosis-of-pneumocystis-jirovecii-pneumonia-in-renal-transplant-recipients
#19
Jonathan Ling, Tara Anderson, Sanchia Warren, Geoffrey Kirkland, Matthew Jose, Richard Yu, Steven Yew, Samantha Mcfadyen, Alison Graver, William Johnson, Lisa Jeffs
Background: The overall incidence of Pneumocystis jirovecii pneumonia (PJP) in solid organ transplant recipients is 5-15%. A timely diagnosis of PJP is difficult and relies on imaging and detection of the organism. Methods: We present a case series of four patients displaying hypercalcaemia with an eventual diagnosis of PJP and document the management of the outbreak with a multidisciplinary team approach. We discuss the underlying pathophysiology and previous reports of hypercalcaemia preceding a diagnosis of PJP...
December 2017: Clinical Kidney Journal
https://www.readbyqxmd.com/read/29217650/serum-and-urine-vitamin-d-metabolite-analysis-in-early-preeclampsia
#20
Jennifer Tamblyn, Carl Jenkinson, Dean Larner, Martin Hewison, Mark Kilby
Vitamin D-deficiency is common in pregnant women, and may contribute to adverse events in pregnancy such as preeclampsia (PET). To date, studies of vitamin D and PET have focused primarily on serum concentrations vitamin D, 25-hydroxyvitamin D3 (25(OH)D3) later in pregnancy. The aim here was to determine whether a more comprehensive analysis of vitamin D metabolites earlier in pregnancy could provide predictors of PET. Using samples from the SCOPE pregnancy cohort, multiple vitamin D metabolites were quantified by liquid chromatography-tandem mass spectrometry in paired serum and urine prior to the onset of PET symptoms...
December 7, 2017: Endocrine Connections
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