title: Epigallocatechin-3-gallate induces mitochondrial membrane depolarization and caspase-dependent apoptosis in pancreatic cancer cells.
abstract: Polyphenols such as epigallocatechin-3-gallate (EGCG) from green tea extract can exert a growth-suppressive effect on human pancreatic cancer cells in vitro. In pursuit of our investigations to dissect the molecular mechanism of EGCG action on pancreatic cancer, we observed that the antiproliferative action of EGCG on pancreatic carcinoma is mediated through programmed cell death or apoptosis as evident from nuclear condensation, caspase-3 activation and poly-ADP ribose polymerase (PARP) cleavage. EGCG-induced apoptosis of pancreatic cancer cells is accompanied by growth arrest at an earlier phase of the cell cycle. In addition, EGCG invokes Bax oligomerization and depolarization of mitochondrial membranes to facilitate cytochrome c release into cytosol. EGCG-induced downregulation of IAP family member X chromosome linked inhibitor of apoptosis protein (XIAP) might be helpful to facilitate cytochrome c mediated downstream caspase activation. On the other end, EGCG elicited the production of intracellular reactive oxygen species (ROS), as well as the c-Jun N-terminal kinase (JNK) activation in pancreatic carcinoma cells. Interestingly, inhibitor of JNK signaling pathway as well as antioxidant N-acetyl-L-cysteine (NAC) blocked EGCG-induced apoptosis. To summarize, our studies suggest that EGCG induces stress signals by damaging mitochondria and ROS-mediated JNK activation in MIA PaCa-2 pancreatic carcinoma cells.
authors.affiliation: Department of Research, Pharmacology, Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH 44109, USA.
authors.forename: Suparna
authors.initials: S
authors.lastname: Qanungo
authors.forename: Madhusudan
authors.initials: M
authors.lastname: Das
authors.forename: Subrata
authors.initials: S
authors.lastname: Haldar
authors.forename: Aruna
authors.initials: A
authors.lastname: Basu
mesh_terms: D000975:Antioxidants / Q000378:metabolism / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects* / Q000502:physiology; D020169:Caspases / Q000378:metabolism; D002392:Catechin / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D045304:Cytochromes c / Q000378:metabolism; D003600:Cytosol / Q000378:metabolism; D016195:G2 Phase / Q000187:drug effects; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D008564:Membrane Potentials / Q000187:drug effects*; D008928:Mitochondria / Q000187:drug effects*; D010190:Pancreatic Neoplasms / Q000188:drug therapy* / Q000201:enzymology; D015398:Signal Transduction / Q000187:drug effects; D013662:Tea / Q000378:metabolism
chemical_list: D000975:Antioxidants; D013662:Tea; D002392:Catechin; D045304:Cytochromes c; C045651:epigallocatechin gallate; D048031:JNK Mitogen-Activated Protein Kinases; D020169:Caspases