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2018 ; 8
(1
): 5958
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Hedgehog Interacting Protein Promotes Fibrosis and Apoptosis in Glomerular
Endothelial Cells in Murine Diabetes
#MMPMID29654303
Zhao XP
; Chang SY
; Liao MC
; Lo CS
; Chenier I
; Luo H
; Chiasson JL
; Ingelfinger JR
; Chan JSD
; Zhang SL
Sci Rep
2018[Apr]; 8
(1
): 5958
PMID29654303
show ga
We investigated whether renal hedgehog interacting protein (Hhip) expression
contributes to the progression of diabetic nephropathy (DN) and studied its
related mechanism(s) in vivo and in vitro. Here, we show that Hhip expression is
highly elevated in glomerular endothelial cells of adult type 1 diabetic (T1D)
Akita and T2D db/db mouse kidneys as compared to non-diabetic control
littermates. Hyperglycemia enhances reactive oxygen species (ROS) generation via
NADPH oxidase 4 (Nox4) activation and stimulates renal Hhip gene expression, and
that elevated renal Hhip gene expression subsequently activates the TGF?1-
Smad2/3 cascade and promotes endothelial to mesenchymal transition associated
with endothelial cell fibrosis/apoptosis in vivo and in vitro. Furthermore,
kidneys of low-dose streptozotocin-induced diabetic heterozygous Hhip deficient
(Hhip(+/-)) mice displayed a normal albumin/creatinine ratio with fewer features
of DN (glomerulosclerosis/fibrosis and podocyte apoptosis/loss) and less evidence
of renal compensation (glomerular hypertrophy and hyperfiltration) as compared to
diabetic wild type controls (Hhip(+/+)). Thus, our studies demonstrated that
renal Hhip expression is associated with nephropathy development in diabetes and
that hyperglycemia-induced renal Hhip expression may mediate glomerular
endothelial fibrosis and apoptosis in diabetes, a novel finding.