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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 J+Biol+Chem
2017 ; 292
(14
): 5665-5675
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Hydrogen sulfide inhibits high glucose-induced NADPH oxidase 4 expression and
matrix increase by recruiting inducible nitric oxide synthase in kidney proximal
tubular epithelial cells
#MMPMID28188286
Lee HJ
; Lee DY
; Mariappan MM
; Feliers D
; Ghosh-Choudhury G
; Abboud HE
; Gorin Y
; Kasinath BS
J Biol Chem
2017[Apr]; 292
(14
): 5665-5675
PMID28188286
show ga
High-glucose increases NADPH oxidase 4 (NOX4) expression, reactive oxygen species
generation, and matrix protein synthesis by inhibiting AMP-activated protein
kinase (AMPK) in renal cells. Because hydrogen sulfide (H(2)S) inhibits high
glucose-induced matrix protein increase by activating AMPK in renal cells, we
examined whether H(2)S inhibits high glucose-induced expression of NOX4 and
matrix protein and whether H(2)S and NO pathways are integrated. High glucose
increased NOX4 expression and activity at 24 h in renal proximal tubular
epithelial cells, which was inhibited by sodium hydrosulfide (NaHS), a source of
H(2)S. High glucose decreased AMPK phosphorylation and activity, which was
restored by NaHS. Compound C, an AMPK inhibitor, prevented NaHS inhibition of
high glucose-induced NOX4 expression. NaHS inhibition of high glucose-induced
NOX4 expression was abrogated by N(?)-nitro-l-arginine methyl ester, an inhibitor
of NOS. NaHS unexpectedly augmented the expression of inducible NOS (iNOS) but
not endothelial NOS. iNOS siRNA and 1400W, a selective iNOS inhibitor, abolished
the ameliorative effects of NaHS on high glucose-induced NOX4 expression,
reactive oxygen species generation, and, matrix laminin expression. Thus, H(2)S
recruits iNOS to generate NO to inhibit high glucose-induced NOX4 expression,
oxidative stress, and matrix protein accumulation in renal epithelial cells; the
two gasotransmitters H(2)S and NO and their interaction may serve as therapeutic
targets in diabetic kidney disease.
|AMP-Activated Protein Kinases/antagonists & inhibitors/metabolism
[MESH]