title: Protein kinase C involvement in aloe-emodin- and emodin-induced apoptosis in lung carcinoma cell.
abstract: 1. This study demonstrated aloe-emodin- and emodin-induced apoptosis in lung carcinoma cell lines CH27 (human lung squamous carcinoma cell) and H460 (human lung non-small cell carcinoma cell). Aloe-emodin- and emodin-induced apoptosis was characterized by nuclear morphological changes and DNA fragmentation. 2. During apoptosis, an increase in cytochrome c of cytosolic fraction and activation of caspase-3, identified by the cleavage of its proform, were observed. 3. To elucidate whether the expression of protein kinase C (PKC) isozymes are involved in aloe-emodin- and emodin-induced apoptosis, this study examined the changes of PKC isozymes by Western blotting techniques during aloe-emodin- and emodin-induced apoptosis. 4. The expression of PKC isozymes involved in aloe-emodin- and emodin-induced apoptosis of CH27 and H460 cells. In this study, aloe-emodin and emodin induced the changes of each of PKC isozymes in CH27 and H460 cells. 5. The decrease in the expression of PKC delta and epsilon may play a critical role in aloe-emodin- and emodin-induced apoptosis in CH27 and H460 cells. 6. The present study also demonstrated that PKC stimulation occurs at a site downstream of caspase-3 in the emodin-mediated apoptotic pathway.
authors.affiliation: School of Pharmacy, China Medical College, 91 Hsueh-Shih Road, Taichung, 404, Taiwan. hong@mail.cmc.edu.tw
authors.forename: H Z
authors.initials: HZ
authors.lastname: Lee
mesh_terms: D000880:Anthraquinones; D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D053148:Caspase 3; D020169:Caspases / Q000187:drug effects / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects; D003574:Cytochrome c Group / Q000187:drug effects / Q000378:metabolism; D004247:DNA / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D053938:DNA Fragmentation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004642:Emodin / Q000031:analogs & derivatives* / Q000494:pharmacology*; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005434:Flow Cytometry; D006801:Humans; D007527:Isoenzymes / Q000378:metabolism; D008175:Lung Neoplasms / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control; D009842:Oligopeptides / Q000494:pharmacology; D011493:Protein Kinase C / Q000378:metabolism*; D013997:Time Factors; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000201:enzymology
chemical_list: D000880:Anthraquinones; D000970:Antineoplastic Agents; D003574:Cytochrome c Group; D004791:Enzyme Inhibitors; D007527:Isoenzymes; D009842:Oligopeptides; C099158:acetyl-aspartyl-glutamyl-valyl-aspartal; C059635:aloe emodin anthrone; D004247:DNA; C518327:aloe emodin; D011493:Protein Kinase C; C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases; D004642:Emodin