TY - JOUR
T1 - Curcumin induces human colon cancer cell death via p62/SQSTM1 degradation, phospho-ERK Up-regulation and ceramide generation
AU - Patel, Mahendra
AU - Thayyullathil, Faisal
AU - Chathoth, Shahanas
AU - Hago, Abdulkader
AU - Pallichankandy, Siraj
AU - Rahman, Anees
AU - Galadari, Sehamuddin
PY - 2012
Y1 - 2012
N2 - Curcumin is a natural yellow phenolic compound extracted from the Indian spice, turmeric (Curcuma longa). Several studies demonstrated the ability of curcumin to inhibit events associated with the promotion of cancer. We investigated the effects curcumin on human colon cancer cells in vitro and further examined the molecular mechanisms of curcumin induced cell death. The signaling adapter p62/SQSTM1, a multifunctional protein implicated in autophagy, apoptosis, cell signaling pathways and tumorigenesis, is one of the potential targets for anti-cancer therapy. In this study, we demonstrate a dose and time-dependent down-regulation of p62/SQSTM1 expression by curcumin that correlates with increase in the loss of viability of human colon cancer cells. We also found that curcumin enhanced phospho-ERK expression and ceramide (Cer) generation in human colon cancer cells. However, the present study also shows that, curcumin-induced p62/SQSTM1 degradation, up-regulation of ERK phosphorylation, Cer generation and cell death can be reversed by extracellular anti-oxidants such as glutathione (GSH) and N-acetyl cysteine (NAC). Overall, our results suggest that down regulation of p62/SQSTM1 and up-regulation of phospho-ERK and Cer generation may contribute to the anti-proliferative effects of curcumin against human colon cancer cells.
AB - Curcumin is a natural yellow phenolic compound extracted from the Indian spice, turmeric (Curcuma longa). Several studies demonstrated the ability of curcumin to inhibit events associated with the promotion of cancer. We investigated the effects curcumin on human colon cancer cells in vitro and further examined the molecular mechanisms of curcumin induced cell death. The signaling adapter p62/SQSTM1, a multifunctional protein implicated in autophagy, apoptosis, cell signaling pathways and tumorigenesis, is one of the potential targets for anti-cancer therapy. In this study, we demonstrate a dose and time-dependent down-regulation of p62/SQSTM1 expression by curcumin that correlates with increase in the loss of viability of human colon cancer cells. We also found that curcumin enhanced phospho-ERK expression and ceramide (Cer) generation in human colon cancer cells. However, the present study also shows that, curcumin-induced p62/SQSTM1 degradation, up-regulation of ERK phosphorylation, Cer generation and cell death can be reversed by extracellular anti-oxidants such as glutathione (GSH) and N-acetyl cysteine (NAC). Overall, our results suggest that down regulation of p62/SQSTM1 and up-regulation of phospho-ERK and Cer generation may contribute to the anti-proliferative effects of curcumin against human colon cancer cells.
KW - Apoptosis
KW - Ceramide
KW - Curcumin
KW - GSH
KW - p62/SQSTM1
KW - phospho-ERK
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UR - http://www.scopus.com/inward/citedby.url?scp=84871702665&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84871702665
SN - 0973-8916
VL - 6
SP - 407
EP - 417
JO - Current Trends in Biotechnology and Pharmacy
JF - Current Trends in Biotechnology and Pharmacy
IS - 4
ER -