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Decreased bone density and increased phosphaturia in gene-targeted mice lacking functional serum- and glucocorticoid-inducible kinase 3.

Abstract：

:Insulin and growth factors activate the phosphatidylinositide-3-kinase pathway, leading to stimulation of several kinases including serum- and glucocorticoid-inducible kinase isoform SGK3, a transport regulating kinase. Here, we explored the contribution of SGK3 to the regulation of renal tubular phosphate transport. Coexpression of SGK3 and sodium-phosphate cotransporter IIa significantly enhanced the phosphate-induced current in Xenopus oocytes. In sgk3 knockout and wild-type mice on a standard diet, fluid intake, glomerular filtration and urine flow rates, and urinary calcium ion excretion were similar. However, fractional urinary phosphate excretion was slightly but significantly larger in the knockout than in wild-type mice. Plasma calcium ion, phosphate concentration, and plasma parathyroid hormone levels were not significantly different between the two genotypes, but plasma calcitriol and fibroblast growth factor 23 concentrations were significantly lower in the knockout than in wild-type mice. Moreover, bone density was significantly lower in the knockouts than in wild-type mice. Histological analysis of the femur did not show any differences in cortical bone but there was slightly less prominent trabecular bone in sgk3 knockout mice. Thus, SGK3 has a subtle but significant role in the regulation of renal tubular phosphate transport and bone density.

journal_name

Kidney Int

journal_title

Kidney international

authors

Bhandaru M,Kempe DS,Rotte A,Capuano P,Pathare G,Sopjani M,Alesutan I,Tyan L,Huang DY,Siraskar B,Judenhofer MS,Stange G,Pichler BJ,Biber J,Quintanilla-Martinez L,Wagner CA,Pearce D,Föller M,Lang F

doi

10.1038/ki.2011.67

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

61-7

issue

1

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)54939-9

journal_volume

80

pub_type

杂志文章

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