NDLI: CGK733-induced LC3 II formation is positively associated with the expression of cyclin-dependent kinase inhibitor p21Waf1/Cip1 through modulation of the AMPK and PERK/CHOP signaling pathways

Content Provider	PubMed Central
Author	Wang, Yufeng Kuramitsu, Yasuhiro Baron, Byron Kitagawa, Takao Tokuda, Kazuhiro Akada, Junko Nakamura, Kazuyuki
Copyright Year	2015
Abstract	Microtubule-associated protein 1A/1B-light chain 3 (LC3)-II is essential for autophagosome formation and is widely used to monitor autophagic activity. We show that CGK733 induces LC3 II and LC3-puncta accumulation, which are not involved in the activation of autophagy. The treatment of CGK733 did not alter the autophagic flux and was unrelated to p62 degradation. Treatment with CGK733 activated the AMP-activated protein kinase (AMPK) and protein kinase RNA-like endoplasmic reticulum kinase/CCAAT-enhancer-binding protein homologous protein (PERK/CHOP) pathways and elevated the expression of p21Waf1/Cip1. Inhibition of both AMPK and PERK/CHOP pathways by siRNA or chemical inhibitor could block CGK733-induced p21Waf1/Cip1 expression as well as caspase-3 cleavage. Knockdown of LC3 B (but not LC3 A) abolished CGK733-triggered LC3 II accumulation and consequently diminished AMPK and PERK/CHOP activity as well as p21Waf1/Cip1 expression. Our results demonstrate that CGK733-triggered LC3 II formation is an initial event upstream of the AMPK and PERK/CHOP pathways, both of which control p21Waf1/Cip1 expression.
Related Links	http://dx.doi.org/10.18632/oncotarget.5625
Ending Page	39701
Page Count	10
Starting Page	39692
File Format	PDF
ISSN	19492553
e-ISSN	19492553
Journal	Oncotarget
Issue Number	37
Volume Number	6
Language	English
Publisher	Impact Journals LLC
Publisher Date	2015-11-01
Access Restriction	Open
Rights Holder	Impact Journals LLC
Subject Keyword	Medicine(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Oncology

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