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2017 ; 8
(6
): e2863
Nephropedia Template TP
gab.com Text
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English Wikipedia
Autophagy blockade and lysosomal membrane permeabilization contribute to
lead-induced nephrotoxicity in primary rat proximal tubular cells
#MMPMID28594408
Song XB
; Liu G
; Liu F
; Yan ZG
; Wang ZY
; Liu ZP
; Wang L
Cell Death Dis
2017[Jun]; 8
(6
): e2863
PMID28594408
show ga
Lead (Pb) is a known nephrotoxicant that causes damage to proximal tubular cells.
Autophagy has an important protective role in various renal injuries, but the
role of autophagy in Pb-elicited nephrotoxicity remains largely unknown. In this
study, Pb promoted the accumulation of autophagosomes in primary rat proximal
tubular (rPT) cells, and subsequent findings revealed that this autophagosome
accumulation was caused by the inhibition of autophagic flux. Moreover, Pb
exposure did not affect the autophagosome-lysosome fusion in rPT cells. Next, we
found that Pb caused lysosomal alkalinization, may be through suppression of two
V-ATPase subunits. Simultaneously, Pb inhibited lysosomal degradation capacity by
affecting the maturation of cathepsin B (CTSB) and cathepsin D (CTSD).
Furthermore, translocation of CTSB and CTSD from lysosome to cytoplasm was
observed in this study, suggesting that lysosomal membrane permeabilization (LMP)
occurred in Pb-exposed rPT cells. Meanwhile, Pb-induced caspase-3 activation and
apoptosis were significantly but not completely inhibited by CTSB inhibitor (CA
074) and CTSD inhibitor (pepstatin A), respectively, demonstrating that
LMP-induced lysosomal enzyme release was involved in Pb-induced apoptosis in rPT
cells. In conclusion, Pb-mediated autophagy blockade in rPT cells is attributed
to the impairment of lysosomal function. Both inhibition of autophagic flux and
LMP-mediated apoptosis contribute to Pb-induced nephrotoxicity in rPT cells.