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2017 ; 8
(32
): 53276-53287
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Infiltrating macrophages in diabetic nephropathy promote podocytes apoptosis via
TNF-?-ROS-p38MAPK pathway
#MMPMID28881810
Guo Y
; Song Z
; Zhou M
; Yang Y
; Zhao Y
; Liu B
; Zhang X
Oncotarget
2017[Aug]; 8
(32
): 53276-53287
PMID28881810
show ga
Macrophage infiltration has been linked to the pathogenesis of diabetic
nephropathy (DN). However, how infiltrating macrophages affect the progression of
DN is unknown. Although infiltrating macrophages produce pro-inflammatory
mediators and induce apoptosis in a variety of target cells, there are no studies
in podocytes. Therefore, we tested the contribution of macrophages to podocytes
apoptosis in DN. in vivo experiments showed that apoptosis in podocytes was
increased in streptozocin (STZ)-induced diabetic rats compared with control rats
and that this apoptosis was accompanied by increased macrophages infiltration in
the kidney. Then, we established a co-culture system to study the interaction
between macrophages and podocytes in the absence or presence of high glucose.
Macrophages did not trigger podocytes apoptosis when they were co-cultured in the
absence of high glucose in a transwell co-culture system. Additionally, although
podocyte apoptosis was increased after high glucose stimulation, there was a
further enhancement of podocyte apoptosis when podocytes were co-cultured with
macrophages in the presence of high glucose compared with podocytes cultured
alone in high glucose. Mechanistically, we found that macrophages were activated
when they were exposed to high glucose, displaying pro-inflammatory M1
polarization. Furthermore, conditioned media (CM) from such high
glucose-activated M1 macrophages (HG-CM) trigged podocytes apoptosis in a
reactive oxygen species (ROS)-p38mitogen-activated protein kinases (p38MAPK)
dependent manner, which was abolished by either a ROS inhibitor (Tempo) or a
p38MAPK inhibitor (SB203580). Finally, we identified tumor necrosis factor
(TNF-?) as a key mediator of high glucose-activated macrophages to induce
podocytes apoptosis because an anti-TNF-? neutralizing antibody blunted the
apoptotic response, excess ROS generation and p38MPAK activation in podocytes
induced by HG-CM. Moreover, addition of recombinant TNF-? similarly resulted in
podocytes apoptosis. In summary, the TNF-? that was released by high
glucose-activated macrophages promoted podocytes apoptosis via ROS-p38MAPK
pathway. Blockade of TNF-? secretion from high glucose activated macrophages and
ROS-p38MAPK pathway might be effective therapeutic options to limit podocytes
apoptosis and delay the progression of diabetic nephropathy.