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2016 ; 7
(5
): 680-8
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Vitamin D and its receptor regulate lipopolysaccharide-induced transforming
growth factor-?, angiotensinogen expression and podocytes apoptosis through the
nuclear factor-?B pathway
#MMPMID27180929
Xu L
; Zhang P
; Guan H
; Huang Z
; He X
; Wan X
; Xiao H
; Li Y
J Diabetes Investig
2016[Sep]; 7
(5
): 680-8
PMID27180929
show ga
AIMS/INTRODUCTION: To investigate the effects of vitamin D and its receptor on
cytokines expression and podocytes apoptosis. MATERIALS AND METHODS: Cultured
mouse podocytes were pre-incubated with vitamin D or transiently transfected with
small interfering ribonucleic acid (RNA) to knock down the vitamin D receptor.
Lipopolysaccharide was used to mimic the inflammation status of diabetes.
RESULTS: In a lipopolysaccharide-induced state, expressions of transforming
growth factor-?, angiotensinogen and vascular endothelial growth factor were
similarly increased. Transforming growth factor-? and angiotensinogen levels
originally elevated by lipopolysaccharide challenge were distinctly reduced after
pre-incubation with vitamin D. Whereas after vitamin D receptor small interfering
(si)RNA transfection, the aforementioned cytokines had opposite changes as
expected. However, neither vitamin D pretreatment nor vitamin D receptor siRNA
transfection influenced the previously increased vascular endothelial growth
factor expression at messenger RNA or protein levels. When pretreated with
vitamin D, decreases were observed for phosphorylated inhibitor-?B and the
inhibitor kinase proteins. After siRNA transfection, those proteins levels were
further elevated. The originally increased transforming growth factor-? and
angiotensinogen levels as a result of lipopolysaccharide stimulation were reduced
at both the messenger RNA and protein levels after the specific inhibition of the
nuclear factor-?B pathway with pyrrolidine dithiocarbamate. The apoptosis rate of
podocytes was decreased in a parallel manner after vitamin D pre-incubation, and
increased after siRNA transfection, which was also suppressed by pyrrolidine
dithiocarbamate. CONCLUSIONS: Vitamin D and its receptor might be involved in the
progression of diabetic nephropathy by regulating transforming growth factor-?,
angiotensinogen expression and apoptosis of podocytes. The processes are mediated
through the signaling of nuclear factor-?B pathway.