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2017 ; 12
(5
): e0178147
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Upregulation of TLR4 via PKC activation contributes to impaired wound healing in
high-glucose-treated kidney proximal tubular cells
#MMPMID28542370
Peng J
; Zheng H
; Wang X
; Cheng Z
PLoS One
2017[]; 12
(5
): e0178147
PMID28542370
show ga
Acute kidney injury (AKI) leads to a worse prognosis in diabetic patients
compared with prognoses in non-diabetic patients, but whether and how diabetes
affects kidney repair after AKI remains unknown. Here, we used scratch-wound
healing and transwell migration models to examine whether and how wound healing
is affected by high glucose levels in cultured kidney proximal tubular cells
(RPTC). The results show that scratch-wound healing and transwell migration were
significantly slower in high-glucose-treated kidney tubular cells (30 mM glucose)
than in low-glucose-treated cells (5.5 mM). Toll-like receptor 4 (TLR4), MyD88,
phospho-protein kinase C (PKC), phospho-p38 MAPK and monocyte chemoattractant
protein-1 (MCP-1) mRNA levels were upregulated after high glucose treatments.
Staurosporine, a selective PKC inhibitor, inhibited TLR4, MyD88 and p-p38
upregulation in the high-glucose-treated cells, indicating the involvement of PKC
in high-glucose-induced TLR4 upregulation. The pharmacological inhibition of TLR4
or shRNA-mediated TLR4 knockdown improved wound healing and transwell migration
in high-glucose-treated RPTC. In contrast, the overexpression of TLR4 in
low-glucose-treated RPTC suppressed wound healing, mimicking the effects of high
glucose levels. These results suggest that the upregulation of TLR4 expression
via PKC activation contributes to defective wound healing in high-glucose-treated
kidney tubular cells.