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Suppressing autophagy enhances disulfiram/copper-induced apoptosis in non-small cell lung cancer.

Identifieur interne : 000087 ( PubMed/Checkpoint ); précédent : 000086; suivant : 000088

Suppressing autophagy enhances disulfiram/copper-induced apoptosis in non-small cell lung cancer.

Auteurs : Xi Wu [République populaire de Chine] ; Xue Xue [République populaire de Chine] ; Lihui Wang [République populaire de Chine] ; Wenjing Wang [République populaire de Chine] ; Jian Han [République populaire de Chine] ; Xiaoxue Sun [République populaire de Chine] ; Haotian Zhang [République populaire de Chine] ; Yueyang Liu [République populaire de Chine] ; Xiaohang Che [République populaire de Chine] ; Jingyu Yang [République populaire de Chine] ; Chunfu Wu [République populaire de Chine]

Source :

RBID : pubmed:29547841

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English descriptors

Abstract

Autophagy, a cellular survival mechanism, is thought to allow the recycling of cellular breakdown products when cancer cells are subjected to chemotherapy, thus decreasing drug-induced apoptosis. Disulfiram (DSF), a drug widely used to control alcoholism, possesses anticancer activity by inducing apoptosis in vitro and in vivo in a copper (Cu)-dependent manner. Our previous studies proved that DSF/Cu exerts increased anti-tumor effects on non-small cell lung cancer (NSCLC) xenograft models, and inhibits NSCLC recurrence driven by ALDH-positive cancer stem cells. The present study is designed to investigate whether DSF/Cu can induce autophagy in NSCLC cells and to determine the relationship between autophagy and apoptosis. First, we observed that DSF/Cu induced significant cytotoxicity and caspase-dependent apoptosis in NSCLC cells, accompanied by the formation of vacuoles in the cytoplasm. Next, we investigated the levels of autophagic markers, including LC3II (microtubule-associated protein 1 light chain 3), ATG5 and p62 with or without chloroquine by Western blot. In addition, we observed co-localization of LC3 and the lysosomal protein LAMP2 (lysosome-associated membrane protein 2) after treatment with DSF/Cu. The results showed that DSF/Cu induced autophagy. Finally, we demonstrated that DSF/Cu-induced apoptosis was greatly enhanced when autophagy was suppressed with Atg5 siRNA or 3-MA in NSCLC cells. This synergistic effect of DSF/Cu and 3-MA was further confirmed in the NSCLC xenograft model. Taken together, our results show that DSF/Cu stimulates autophagy in NSCLC cells, which is an impediment to DSF/Cu-induced apoptosis.

DOI: 10.1016/j.ejphar.2018.02.039
PubMed: 29547841


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<div type="abstract" xml:lang="en">Autophagy, a cellular survival mechanism, is thought to allow the recycling of cellular breakdown products when cancer cells are subjected to chemotherapy, thus decreasing drug-induced apoptosis. Disulfiram (DSF), a drug widely used to control alcoholism, possesses anticancer activity by inducing apoptosis in vitro and in vivo in a copper (Cu)-dependent manner. Our previous studies proved that DSF/Cu exerts increased anti-tumor effects on non-small cell lung cancer (NSCLC) xenograft models, and inhibits NSCLC recurrence driven by ALDH-positive cancer stem cells. The present study is designed to investigate whether DSF/Cu can induce autophagy in NSCLC cells and to determine the relationship between autophagy and apoptosis. First, we observed that DSF/Cu induced significant cytotoxicity and caspase-dependent apoptosis in NSCLC cells, accompanied by the formation of vacuoles in the cytoplasm. Next, we investigated the levels of autophagic markers, including LC3II (microtubule-associated protein 1 light chain 3), ATG5 and p62 with or without chloroquine by Western blot. In addition, we observed co-localization of LC3 and the lysosomal protein LAMP2 (lysosome-associated membrane protein 2) after treatment with DSF/Cu. The results showed that DSF/Cu induced autophagy. Finally, we demonstrated that DSF/Cu-induced apoptosis was greatly enhanced when autophagy was suppressed with Atg5 siRNA or 3-MA in NSCLC cells. This synergistic effect of DSF/Cu and 3-MA was further confirmed in the NSCLC xenograft model. Taken together, our results show that DSF/Cu stimulates autophagy in NSCLC cells, which is an impediment to DSF/Cu-induced apoptosis.</div>
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<AbstractText>Autophagy, a cellular survival mechanism, is thought to allow the recycling of cellular breakdown products when cancer cells are subjected to chemotherapy, thus decreasing drug-induced apoptosis. Disulfiram (DSF), a drug widely used to control alcoholism, possesses anticancer activity by inducing apoptosis in vitro and in vivo in a copper (Cu)-dependent manner. Our previous studies proved that DSF/Cu exerts increased anti-tumor effects on non-small cell lung cancer (NSCLC) xenograft models, and inhibits NSCLC recurrence driven by ALDH-positive cancer stem cells. The present study is designed to investigate whether DSF/Cu can induce autophagy in NSCLC cells and to determine the relationship between autophagy and apoptosis. First, we observed that DSF/Cu induced significant cytotoxicity and caspase-dependent apoptosis in NSCLC cells, accompanied by the formation of vacuoles in the cytoplasm. Next, we investigated the levels of autophagic markers, including LC3II (microtubule-associated protein 1 light chain 3), ATG5 and p62 with or without chloroquine by Western blot. In addition, we observed co-localization of LC3 and the lysosomal protein LAMP2 (lysosome-associated membrane protein 2) after treatment with DSF/Cu. The results showed that DSF/Cu induced autophagy. Finally, we demonstrated that DSF/Cu-induced apoptosis was greatly enhanced when autophagy was suppressed with Atg5 siRNA or 3-MA in NSCLC cells. This synergistic effect of DSF/Cu and 3-MA was further confirmed in the NSCLC xenograft model. Taken together, our results show that DSF/Cu stimulates autophagy in NSCLC cells, which is an impediment to DSF/Cu-induced apoptosis.</AbstractText>
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<Keyword MajorTopicYN="N">Non-small cell lung cancer</Keyword>
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<Month>02</Month>
<Day>26</Day>
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<name sortKey="Wang, Wenjing" sort="Wang, Wenjing" uniqKey="Wang W" first="Wenjing" last="Wang">Wenjing Wang</name>
<name sortKey="Wu, Chunfu" sort="Wu, Chunfu" uniqKey="Wu C" first="Chunfu" last="Wu">Chunfu Wu</name>
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