Please use this identifier to cite or link to this item: https://doi.org/10.1158/1541-7786.MCR-10-0545
Title: Curcumin sensitizes acute promyelocytic leukemia cells to unfolded protein response-induced apoptosis by blocking the loss of misfolded N-CoR protein
Authors: Ng, A.P.P.
Chng, W.J.
Khan, M. 
Issue Date: Jul-2011
Citation: Ng, A.P.P., Chng, W.J., Khan, M. (2011-07). Curcumin sensitizes acute promyelocytic leukemia cells to unfolded protein response-induced apoptosis by blocking the loss of misfolded N-CoR protein. Molecular Cancer Research 9 (7) : 878-888. ScholarBank@NUS Repository. https://doi.org/10.1158/1541-7786.MCR-10-0545
Abstract: Acute promyelocytic leukemia (APL) is characterized by accumulation of apoptosis-resistant immature promyelocytic cells in the bone marrow and peripheral blood. We have shown that endoplasmic reticulum (ER)-associated degradation (ERAD) and protease-mediated degradation of misfolded nuclear receptor corepressor (N-CoR) confer resistance to unfolded protein response (UPR)-induced apoptosis in APL. These findings suggest that therapeutic inhibition of N-CoR misfolding or degradation may promote growth arrest in APL cells by sensitizing them to UPR-induced apoptosis. On the basis of this hypothesis, we tested the effects of several known protein conformation- modifying agents on the growth and survival of APL cells and identified curcumin, a natural component of turmeric, as a potent growth inhibitor of APL cells. Curcumin selectively inhibited the growth and promoted apoptosis in both primary and secondary leukemic cells derived from APL. The curcumin-nduced apoptosis of APL cells was triggered by an amplification of ER stress, possibly from the accumulation of misfolded N-CoR protein in the ER. Curcumin promoted this net accumulation of aberrantly phosphorylated misfolded N-CoR protein by blocking its ERAD and protease-mediated degradation, which then led to the activation of UPR-induced apoptosis in APL cells. The activation of UPR by curcumin was manifested by phosphorylation of protein kinase RNA-like endoplasmic reticulum kinase (PERK) and eukaryotic translation initiation factor 2 alpha (eIF2α), and upregulation of C/EBP homologous protein (CHOP) and GADD34, the principal mediators of proapoptotic UPR. These findings identify the therapeutic potential of curcumin in APL and further establish the rationale of misfolded N-CoR protein as an attractive molecular target in APL. ©2011 AACR.
Source Title: Molecular Cancer Research
URI: http://scholarbank.nus.edu.sg/handle/10635/110730
ISSN: 15417786
DOI: 10.1158/1541-7786.MCR-10-0545
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