FGF23 acts directly on renal proximal tubules to induce phosphaturia through activation of the ERK1/2-SGK1 signaling pathway.

FGF23 acts directly on renal proximal tubules to induce phosphaturia through activation of the ERK1/2-SGK1 signaling pathway.
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DOI:
10.1016/j.bone.2012.05.015
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发表时间:
2012-09
期刊:
影响因子:
4.1
通讯作者:
Erben, Reinhold G.
Erben, Reinhold G.
中科院分区:
医学2区
文献类型:
--
作者:
Andrukhova, Olena;Zeitz, Ute;Goetz, Regina;Mohammadi, Moosa;Lanske, Beate;Erben, Reinhold G.

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成纤维细胞生长因子-23 (FGF23)是一种骨源性的磷酸盐稳态内分泌调节剂,可抑制肾小管磷酸盐的再吸收。循环FGF23与细胞膜中FGF受体的结合需要协同受体αKlotho的同时存在。αKlotho是否在肾近端小管中表达仍有争议,近端小管是磷酸再吸收的主要部位。因此,FGF23如何下调肾脏磷酸盐重吸收仍然是一个谜。在这里,我们发现肾近端小管细胞确实与同源FGF受体一起表达共受体αKlotho,并且FGF23通过ERK1/2和血清/糖皮质激素调节的激酶-1信号通路,通过丝氨酸磷酸化支架蛋白Na+/H+交换调节辅助因子(NHERF)-1,直接下调磷酸钠共转运蛋白NaPi-2a的膜表达。
Fibroblast growth factor-23 (FGF23) is a bone-derived endocrine regulator of phosphate homeostasis which inhibits renal tubular phosphate reabsorption. Binding of circulating FGF23 to FGF receptors in the cell membrane requires the concurrent presence of the co-receptor αKlotho. It is still controversial whether αKlotho is expressed in the kidney proximal tubule, the principal site of phosphate reabsorption. Hence, it has remained an enigma as to how FGF23 downregulates renal phosphate reabsorption. Here, we show that renal proximal tubular cells do express the co-receptor αKlotho together with cognate FGF receptors, and that FGF23 directly downregulates membrane expression of the sodium-phosphate cotransporter NaPi-2a by serine phosphorylation of the scaffolding protein Na+/H+ exchange regulatory cofactor (NHERF)-1 through ERK1/2 and serum/glucocorticoid-regulated kinase-1 signaling.
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