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2017 ; 8
(49
): 86227-86239
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Kaempferol induces autophagic cell death of hepatocellular carcinoma cells via
activating AMPK signaling
#MMPMID29156790
Han B
; Yu YQ
; Yang QL
; Shen CY
; Wang XJ
Oncotarget
2017[Oct]; 8
(49
): 86227-86239
PMID29156790
show ga
In the present study, we demonstrate that Kaempferol inhibited survival and
proliferation of established human hepatocellular carcinoma (HCC) cell lines
(HepG2, Huh-7, BEL7402, and SMMC) and primary human HCC cells. Kaempferol
treatment in HCC cells induced profound AMP-activated protein kinase (AMPK)
activation, which led to Ulk1 phosphorylation, mTOR complex 1 inhibition and cell
autophagy. Autophagy induction was reflected by Beclin-1/autophagy gene 5
upregulation and p62 degradation as well as light chain 3B (LC3B)-I to LC3B-II
conversion and LC3B puncta formation. Inhibition of AMPK, via AMPK?1 shRNA or
dominant negative mutation, reversed above signaling changes. AMPK inhibition
also largely inhibited Kaempferol-induced cytotoxicity in HCC cells. Autophagy
inhibition, by 3-methyaldenine or Beclin-1 shRNA, also protected HCC cells from
Kaempferol. Kaempferol downregulated melanoma antigen 6, the AMPK ubiquitin
ligase, causing AMPK?1 stabilization and accumulation. We conclude that
Kaempferol inhibits human HCC cells via activating AMPK signaling.