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- W2015093334 abstract "Leptin is the LEP (ob) gene product secreted by adipocytes. We previously reported that leptin decreases renal expression of the 25-hydroxyvitamin D(3) 1alpha-hydroxylase (CYP27B1) gene through the leptin receptor (ObRb) by indirectly acting on the proximal tubules. This study focused on bone-derived fibroblast growth factor 23 (FGF-23) as a mediator of the influence of leptin on renal 1alpha-hydroxylase mRNA expression in leptin-deficient ob/ob mice. Exposure to leptin (200 ng/mL) for 24 hours stimulated FGF-23 expression by primary cultured rat osteoblasts. Administration of leptin (4 mg/kg i.p. at 12-hour intervals for 2 days) to ob/ob mice markedly increased the serum FGF-23 concentration while significantly reducing the serum levels of calcium, phosphate, and 1alpha,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)]. Administration of FGF-23 (5 microg i.p. at 12-hour intervals for 2 days) to ob/ob mice suppressed renal 1alpha-hydroxylase mRNA expression. The main site of FGF-23 mRNA expression was the bone, and leptin markedly increased the FGF-23 mRNA level in ob/ob mice. In addition, leptin significantly reduced 1alpha-hydroxylase and sodium-phosphate cotransporters (NaP(i)-IIa and NaP(i)-IIc) mRNA levels but did not affect Klotho mRNA expression in the kidneys of ob/ob mice. Furthermore, the serum FGF-23 level and renal expression of 1alpha-hydroxylase mRNA were not influenced by administration of leptin to leptin receptor-deficient (db/db) mice. These results indicate that leptin directly stimulates FGF-23 synthesis by bone cells in ob/ob mice, suggesting that inhibition of renal 1,25(OH)(2)D(3) synthesis in these mice is at least partly due to elevated bone production of FGF-23." @default.
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- W2015093334 date "2010-02-08" @default.
- W2015093334 modified "2023-10-10" @default.
- W2015093334 title "Leptin stimulates fibroblast growth factor 23 expression in bone and suppresses renal 1α,25-dihydroxyvitamin D3 synthesis in leptin-deficient ob/ob Mice" @default.
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- W2015093334 doi "https://doi.org/10.1002/jbmr.65" @default.
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