Cleaving Beclin 1 to suppress autophagy in chemotherapy-induced apoptosis

 Abstract

Autophagy is often found in apoptosis-defective cancer cells and contributes to chemotherapy resistance. However, it is far from clear how the coordination of apoptosis and autophagy determines sensitivity of cancer cells to chemotherapy. Our recent study showed that Beclin 1, a key regulator of autophagy, is cleaved by caspase 8 at the execution stage of chemotherapy-induced and mitochondria-mediated apoptosis. Perturbation of Beclin 1 cleavage, by knock-in of a mutation, phenocopies the autophagy observed in apoptosis-defective cancer cells, and renders chemotherapy resistance in vitro and in vivo. These results demonstrate an important role of caspases in suppressing autophagy by cleaving autophagic machinery.

 Related Article:

ZB Ding, YH Shi, J Zhou, SJ Qiu, Y Xu, Z Dai, GM Shi, XY Wang, AW Ke, B Wu, J Fan. Association of autophagy defect with a malignant phenotype and poor prognosis of hepatocellular carcinoma. Cancer Res 2008; 68: 9167- 75.
PMID: 21199803 DOI: 10.1158/0008-5472.CA

Full Text Options
Article
Metrics
 Share
 Full Text
 Info
Pages
1239 - 1241
doi
10.4161/auto.7.10.16490
Type
Autophagic Punctum
 Metrics
 Cite This Article
 Permissions
 Permissions
 Reprints
Cleaving Beclin 1 to suppress autophagy in chemotherapy-induced apoptosis