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2011 ; 80
(1
): 61-7
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Decreased bone density and increased phosphaturia in gene-targeted mice lacking
functional serum- and glucocorticoid-inducible kinase 3
#MMPMID21451460
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
Kidney Int
2011[Jul]; 80
(1
): 61-7
PMID21451460
show ga
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.