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FoxO1 AND Vitamin D

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https://www.readbyqxmd.com/read/28161531/skeletal-muscle-vitamin-d-in-patients-with-end-stage-osteoarthritis-of-the-knee
#1
Tara C Brennan-Speranza, David Mor, Rebecca S Mason, John R Bartlett, Gustavo Duque, Itamar Levinger, Pazit Levinger
Muscle function is often impaired in patients with knee osteoarthritis (OA), with reduced strength and increased pain. The role of vitamin D and the vitamin D-endocrine pathway in muscle health has recently been placed in the spotlight, with various groups reporting positive effects on muscle development, function and health. Recently, it has been shown that uptake into muscle of the specialized vitamin D binding protein (DBP) is dependent on the endocytic receptor, megalin. Here we analyse circulating vitamin D, and muscle DBP, megalin and the cognate vitamin D receptor (VDR) in patients with knee OA and compare them to asymptomatic controls...
February 1, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/26462119/foxo1-mediates-vitamin-d-deficiency-induced-insulin-resistance-in-skeletal-muscle
#2
Songcang Chen, S Armando Villalta, Devendra K Agrawal
Prospective epidemiological studies have consistently shown a relationship between vitamin D deficiency, insulin resistance, and type 2 diabetes mellitus (DM2). This is supported by recent trials showing that vitamin D supplementation in prediabetic or insulin-resistant patients with inadequate vitamin D levels improves insulin sensitivity. However, the molecular mechanisms underlying vitamin D deficiency-induced insulin resistance and DM2 remain unknown. Skeletal muscle insulin resistance is a primary defect in the majority of patients with DM2...
March 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/23098692/influence-of-vitamin-d-on-cisplatin-sensitivity-in-testicular-germ-cell-cancer-derived-cell-lines-and-in-a-ntera2-xenograft-model
#3
Anne Jørgensen, Martin Blomberg Jensen, John Erik Nielsen, Anders Juul, Ewa Rajpert-De Meyts
The active form of vitamin D, 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) has anti-proliferative, pro-apoptotic, and pro-differentiating effects in somatic cancer cells in vitro and in vivo. 1,25(OH)2D3 also augments the anti-tumor effects of several chemotherapeutic agents, including cisplatin, which may have clinical relevance. Given the pro-differentiation effect of vitamin D recently demonstrated in testicular germ cell tumors (TGCTs), we hypothesized that 1,25(OH)2D3 could be a beneficial adjunctive to existing chemotherapy regime used to treat these tumors...
July 2013: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/22989484/1-25-dihydroxyvitamin-d3-and-the-aging-related-forkhead-box-o-and-sestrin-proteins-in-osteoblasts
#4
Guy Eelen, Lieve Verlinden, Mark B Meyer, Rik Gijsbers, J Wesley Pike, Roger Bouillon, Annemieke Verstuyf
Forkhead Box O (FoxO) transcription factors and Sestrins (SESN) are highly conserved and related stress-responsive proteins that protect the organism against age-related pathologies. For FoxOs, growing evidence shows a crucial role in osteoblast function. Here we investigated the role of different FoxO and SESN isoforms in 1,25(OH)2D3-treated MC3T3-E1 osteoblasts. 1,25(OH)2D3 rapidly and strongly induced the expression of SESN1 and FoxO3a but down-regulated the expression of SESN3 and FoxO1. SESN2 and FoxO4 levels were hardly affected by 1,25(OH)2D3...
July 2013: Journal of Steroid Biochemistry and Molecular Biology
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