PI3K/AKT/mTOR通路
细胞毒性T细胞
翻译(生物学)
激酶
蛋白激酶A
化学
细胞生物学
癌症研究
生物
生物化学
信号转导
体外
基因
信使核糖核酸
作者
Tirawit Meerod,Rapeepat Sangsuwan,Kanawut Klumthong,Bunkuea Chantrathonkul,Nadgrita Phutubtim,Piyarat Govitrapong,Somsak Ruchirawat,Poonsakdi Ploypradith,Pattarawut Sopha
出处
期刊:PubMed
日期:2024-04-26
摘要
Analogs of pyrrole alkaloid lamellarins exhibit anticancer activity by modulating multiple cellular events. Lethal doses of several lamellarins were found to enhance autophagy flux in HeLa cells, suggesting that lamellarins may modulate protein homeostasis through the interference of proteins or kinases controlling energy and nutrient metabolism. To further delineate molecular mechanisms and their targets, our results herein show that azalamellarin D (AzaD) cytotoxicity could cause translational attenuation, as indicated by a change in eIF2α phosphorylation. Intriguingly, acute AzaD treatment promoted the phosphorylation of GCN2, a kinase that transduces the integrated stress response (ISR), and prolonged exposure to AzaD could increase the levels of the phosphorylated forms of eIF2α and the other ISR kinase PKR. However, the effects of AzaD on ISR signaling were marginally abrogated in cells with genetic deletion of GCN2 and PKR, and evaluation of protein target engagement by CETSA revealed no significant interaction between AzaD and ISR kinases. Further investigation revealed that acute AzaD treatment negatively affected mTOR phosphorylation and signaling. The analyses by CETSA and computational modeling indicated that mTOR may be a possible protein target for AzaD. These findings indicate the potential for developing lamellarins as novel agents for cancer treatment.
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