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The antitumor effect of norcantharidin (NCTD) has been widely reported. However, whether NCTD can inhibit cervical cancer remains unknown. In the present study, it was shown that NCTD inhibited the viability of cervical cancer cells and caused cell cycle arrest in a concentration‑dependent manner. Further analysis revealed that the NCTD‑induced reduction in cell viability could be reversed by the inhibitor of apoptosis z‑VAD‑FMK and by the inhibitor of endoplasmic reticulum (ER) stress, 4‑phenylbutyric acid (4‑PBA). Additionally, NCTD led to the accumulation of reactive oxygen species as well as a decrease in the mitochondrial membrane potential in cervical cancer cells, whereas 4‑PBA pre‑treatment attenuated these alterations. In addition, NCTD increased the expression of the apoptosis‑related proteins Bip, activating transcription factor (ATF) 4 and C/EBP homologous protein in a concentration‑dependent manner. Moreover, NCTD significantly increased the expression of the ER stress‑related signaling molecules protein kinase R‑like ER kinase, inositol‑requiring enzyme 1 and ATF6, but 4‑PBA abolished these effects.
Zhang et al. (Thu,) studied this question.
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