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2017 ; 40
(4
): 1185-1193
Nephropedia Template TP
gab.com Text
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English Wikipedia
Advanced glycation end products induce the apoptosis of and inflammation in mouse
podocytes through CXCL9-mediated JAK2/STAT3 pathway activation
#MMPMID28849106
Yu J
; Wu H
; Liu ZY
; Zhu Q
; Shan C
; Zhang KQ
Int J Mol Med
2017[Oct]; 40
(4
): 1185-1193
PMID28849106
show ga
Diabetic nephropathy (DN) is a serious and one of the most common microvascular
complications of diabetes. There is accumulating evidence to indicate that
advanced glycation end products (AGEs), senescent macroprotein derivatives formed
at an accelerated rate under conditions of diabetes, play a role in DN. In this
study, we found that the serum and urine levels of C-X-C motif chemokine
ligand 9 (CXCL9) were significantly elevated in patients with DN compared with
healthy controls. Based on an in vitro model of mouse podocyte injury, AGEs
decreased the proliferation of podocytes and increased the expression of CXCL9
and C-X-C motif chemokine receptor 3 (CXCR3), and promoted the activation of
signal transducer and activator of transcription 3 (STAT3). The knockdown of
CXCL9 by the transfection of mouse podoyctes with specific siRNA significantly
increased the proliferation and decreased the apoptosis of the podoyctes.
Moreover, the levels of inflammatory factors, such as tumor necrosis
factor (TNF)?? and interleukin (IL)?6 were also decreased in the podoyctes
transfected with siRNA-CXCL9, accompanied by the increased expression of nephrin
and podocin, and decreased levels of Bax/Bcl-2 and activated caspase-3. The
knockdown of CXCL9 also led to the inactivation of the Janus
kinase 2 (JAK2)/STAT3 pathway. Importantly, the use of the JAK2 inhibitor, AG490,
and valsartan (angiotensin II receptor antagonist) attenuated the injury induced
to mouse podoyctes by AGEs. On the whole, and to the best of our knowledge, this
study demonstrates for the first time that AGEs exert pro-apoptotic and
pro-inflammatory effects in mouse podoyctes through the CXCL9-mediated activation
of the JAK2/STAT3 pathway. Thus, our data provide a potential therapeutic target
for DN.