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2015 ; 46
(ä): 172-85
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MMP-9- and NMDA receptor-mediated mechanism of diabetic renovascular remodeling
and kidney dysfunction: hydrogen sulfide is a key modulator
#MMPMID25659756
Kundu S
; Pushpakumar S
; Sen U
Nitric Oxide
2015[Apr]; 46
(ä): 172-85
PMID25659756
show ga
Previously we reported that matrix metalloproteinase-9 (MMP-9) plays an important
role in extracellular matrix (ECM) remodeling in diabetic kidney. Induction of
NMDA-R and dysregulation of connexins (Cxs) were also observed. We concluded that
this was due to decreased H2S production by downregulation of CBS and CSE
enzymes. However, the potential role of H2S to mitigate ECM dysregulation and
renal dysfunction was not clearly understood. The present study was undertaken to
determine whether H2S supplementation reduces MMP-9-induced ECM remodeling and
dysfunction in diabetic kidney. Wild type (C57BL/6J), diabetic (Akita,
C57BL/6J-Ins2(Akita)), MMP-9 knockout (MMP-9(-/-), M9KO) and double KO of
Akita/MMP-9(-/-) (DKO) mice were treated without or with 0.005 g/l of NaHS (as a
source of H2S) in drinking water for 30 days. Decreased tissue production and
plasma content of H2S in Akita mice were ameliorated with H2S supplementation.
Dysregulated expression of MMP-9, CBS, CSE, NMDA-R1 and Cxs-40, -43 was also
normalized in Akita mice treated with H2S. In addition, increased renovascular
resistive index (RI), ECM deposition, plasma creatinine, and diminished renal
vascular density and cortical blood flow in Akita mice were normalized with H2S
treatment. We conclude that diminished H2S production in renal tissue and plasma
levels in diabetes mediates adverse renal remodeling, and H2S therapy improves
renal function through MMP-9- and NMDA-R1-mediated pathway.