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2016 ; 11
(3
): e0150001
Nephropedia Template TP
Leventhal JS
; Ni J
; Osmond M
; Lee K
; Gusella GL
; Salem F
; Ross MJ
PLoS One
2016[]; 11
(3
): e0150001
PMID26990086
show ga
Sepsis related acute kidney injury (AKI) is a common in-hospital complication
with a dismal prognosis. Our incomplete understanding of disease pathogenesis has
prevented the identification of hypothesis-driven preventive or therapeutic
interventions. Increasing evidence in ischemia-reperfusion and nephrotoxic mouse
models of AKI support the theory that autophagy protects renal tubular epithelial
cells (RTEC) from injury. However, the role of RTEC autophagy in septic AKI
remains unclear. We observed that lipopolysaccharide (LPS), a mediator of
gram-negative bacterial sepsis, induces RTEC autophagy in vivo and in vitro
through TLR4-initiated signaling. We modeled septic AKI through intraperitoneal
LPS injection in mice in which autophagy-related protein 7 was specifically
knocked out in the renal proximal tubules (ATG7KO). Compared to control
littermates, ATG7KO mice developed more severe renal dysfunction (24hr BUN
100.1mg/dl +/- 14.8 vs 54.6mg/dl +/- 11.3) and parenchymal injury. After
injection with LPS, analysis of kidney lysates identified higher IL-6 expression
and increased STAT3 activation in kidney lysates from ATG7KO mice compared to
controls. In vitro experiments confirmed an altered response to LPS in RTEC with
genetic or pharmacological impairment of autophagy. In conclusion, RTEC autophagy
protects against endotoxin induced injury and regulates downstream effects of
RTEC TLR4 signaling.