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Compound K induced apoptosis via endoplasmic reticulum Ca 2+ release through ryanodine receptor in human lung cancer cells

Compound K induced apoptosis via endoplasmic reticulum Ca 2+ release through ryanodine receptor in human lung cancer cells

Dong-Hyun Shin, Dong-Gyu Leem, Ji-Sun Shin, Joo-Il Kim, Kyung-Tack Kim, Sang Yoon Choi, Myung-Hee Lee, Jung-Hye Choi, Kyung-Tae Lee

J Ginseng Res. 2018 Apr;42(2):165-174.

PMID: 29719463

Abstract:

Background:
Extended endoplasmic reticulum (ER) stress may initiate apoptotic pathways in cancer cells, and ER stress has been reported to possibly increase tumor death in cancer therapy. We previously reported that caspase-8 played an important role in compound K-induced apoptosis via activation of caspase-3 directly or indirectly through Bid cleavage, cytochrome c release, and caspase-9 activation in HL-60 human leukemia cells. The mechanisms leading to apoptosis in A549 and SK-MES-1 human lung cancer cells and the role of ER stress have not yet been understood.
Methods:
The apoptotic effects of compound K were analyzed using flow cytometry, and the changes in protein levels were determined using Western blot analysis. The intracellular calcium levels were monitored by staining with Fura-2/AM and Fluo-3/AM.
Results:
Compound K-induced ER stress was confirmed through increased phosphorylation of eIF2α and protein levels of GRP78/BiP, XBP-1S, and IRE1α in human lung cancer cells. Moreover, compound-K led to the accumulation of intracellular calcium and an increase in m-calpain activities that were both significantly inhibited by pretreatment either with BAPTA-AM (an intracellular Ca2+ chelator) or dantrolene (an RyR channel antagonist). These results were correlated with the outcome that compound K induced ER stress-related apoptosis through caspase-12, as z-ATAD-fmk (a specific inhibitor of caspase-12) partially ameliorated this effect. Interestingly, 4-PBA (ER stress inhibitor) dramatically improved the compound K-induced apoptosis.
Conclusion:
Cell survival and intracellular Ca2+ homeostasis during ER stress in human lung cancer cells are important factors in the induction of the compound K-induced apoptotic pathway.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP301359057	Dantrolene Related Compound A		301359-05-7	Price
IAR424959	Calpain 1 human			Price

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