In:
Anti-Cancer Agents in Medicinal Chemistry, Bentham Science Publishers Ltd., Vol. 20, No. 8 ( 2020-07-24), p. 982-988
Abstract:
Cassane-type diterpenoids are widely distributed in the medical plants of genus Caesalpinia.
To date, plenty of cassane diterpenoids have been isolated from the genus Caesalpinia, and some of them were documented to exhibit multiple biological activities. However, the effects of these compounds on
autophagy have never been reported. Objective: To investigate the effects and mechanisms of the cassane diterpenoids including Phanginin R (PR) on
autophagy in Non-Small Cell Lung Cancer (NSCLC) A549 cells. Methods: Western blot analysis and immunofluorescence assay were performed to investigate the effects of the
compounds on autophagic flux in A549 cells. The pathway inhibitor and siRNA interference were used to investigate the mechanism of PR. MTT assay was performed to detect cell viability. Results: PR treatment upregulated the expression of phosphatidylethanolamine-modified microtubule-associated
protein Light-Chain 3 (LC3-II) in A549 cells. Immunofluorescence assay showed that PR treatment increased the production of red-fluorescent puncta in mRFP-GFP-LC3 plasmid-transfected cells, indicating PR promoted autophagic flux in A549 cells. PR treatment activated the c-Jun N-terminal Kinase (JNK) signaling pathway
while it did not affect the classical Akt/mammalian Target of Rapamycin (mTOR) pathway. Pretreatment with the JNK inhibitor SP600125 or siRNA targeting JNK or c-Jun suppressed PR-induced autophagy. In addition,
cotreatment with the autophagy inhibitor Chloroquine (CQ) or inhibition of the JNK/c-Jun signaling pathway increased PR-induced cytotoxicity. Conclusion: PR induced cytoprotective autophagy in NSCLC A549 cells via the JNK/c-Jun signaling pathway,
and autophagy inhibition could further improve the anti-cancer potential of PR.
Type of Medium:
Online Resource
ISSN:
1871-5206
DOI:
10.2174/1871520620666200414095828
Language:
English
Publisher:
Bentham Science Publishers Ltd.
Publication Date:
2020
SSG:
15,3
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