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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Renal+Physiol
2015 ; 308
(7
): F713-9
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Cross-talk between insulin and IGF-1 receptors in the cortical collecting duct
principal cells: implication for ENaC-mediated Na+ reabsorption
#MMPMID25651558
Ilatovskaya DV
; Levchenko V
; Brands MW
; Pavlov TS
; Staruschenko A
Am J Physiol Renal Physiol
2015[Apr]; 308
(7
): F713-9
PMID25651558
show ga
Insulin and IGF-1 are recognized as powerful regulators of the epithelial Na+
channel (ENaC) in the aldosterone-sensitive distal nephron. As previously
described, these hormones both acutely increase ENaC activity in freshly isolated
split open tubules and cultured principal cortical collecting duct cells. The
present study was aimed at differentiating the effects of insulin and IGF-1 on
Na+ transport in immortalized mpkCCDcl4 cells and defining their interrelations.
We have shown that both insulin and IGF-1 applied basolaterally, but not
apically, enhanced transepithelial Na+ transport in the mpkCCDcl4 cell line with
EC50 values of 8.8 and 14.5 nM, respectively. Insulin treatment evoked
phosphorylation of both insulin and IGF-1 receptors, whereas the effects of IGF-1
were more profound on its own receptor rather than the insulin receptor. AG-1024
and PPP, inhibitors of IGF-1 and insulin receptor tyrosine kinase activity,
diminished insulin- and IGF-1-stimulated Na+ transport in mpkCCDcl4 cells. The
effects of insulin and IGF-1 on ENaC-mediated currents were found to be additive,
with insulin likely stimulating both IGF-1 and insulin receptors. We hypothesize
that insulin activates IGF-1 receptors in addition to its own receptors, making
the effects of these hormones interconnected.