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2018 ; 4
(ä): 2
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Autophagy activation contributes to lipid accumulation in tubular epithelial
cells during kidney fibrosis
#MMPMID30062051
Yan Q
; Song Y
; Zhang L
; Chen Z
; Yang C
; Liu S
; Yuan X
; Gao H
; Ding G
; Wang H
Cell Death Discov
2018[]; 4
(ä): 2
PMID30062051
show ga
Sustained activation of autophagy and lipid accumulation in tubular epithelial
cells (TECs) are both associated with the kidney fibrosis progression. Autophagy
has been found involved in the lipid metabolism regulation through a
bi-directional mechanism of inducing lipolysis as well as promoting lipid droplet
formation. However, whether and how autophagy influences lipid accumulation in
kidney fibrosis remain unclear. In the current study, we show that UUO-induced
lipid accumulation in tubular cells was significantly reduced when the
pharmacological inhibitor 3-MA or CQ was administrated both in vivo and in vitro.
Of interest, colocalization of LDs and autophagosomes, as well as colocalization
of LDs and lysosomes were undetected in UUO-induced fibrotic kidneys, although
lysosome function remained robust, indicating the lipid accumulation is
lipophagy-lysosome pathway independent. TGF-?1-induced lipid droplets formation
in HK-2 cells were decreased when the Beclin-1 expression was silenced, implying
that autophagy-upregulated lipid droplets formation is Beclin-1 dependent.
Finally, CQ treatment of UUO-induced fibrotic kidneys reduced the expression of
?-SMA and tubular cell apoptosis and rescued the expression of E-cadherin, which
was associated with the ameliorated lipid deposition. Therefore, our work
documented that autophagy promotes lipid droplet formation in TECs in a
Beclin-1-dependent manner, which causes renal lipotoxicity and contributes to the
progression of kidney fibrosis.