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Modulation of Anti-apoptosis by Endogenous IAP Expression in MKN45 Human Gastric Cancer Cells
Background: This study was designed to clarify differences in apoptotic signal transduction between gastric cancer cells and leukemia cells. Materials and Methods: In order to study apoptotic signal transduction of gastric cancer cells, MKN45 gastric cancer cells expressing the wild-type p53 gene an...
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Published in: | Anticancer research 2005-07, Vol.25 (4), p.2713-2717 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | Background: This study was designed to clarify differences in apoptotic signal transduction between gastric cancer cells and
leukemia cells. Materials and Methods: In order to study apoptotic signal transduction of gastric cancer cells, MKN45 gastric
cancer cells expressing the wild-type p53 gene and U937 myeloid leukemia cells expressing a mutated p53 gene were prepared.
Cisplatin (CDDP) was used to induce apoptosis. We compared apoptotic signal transduction downstream to mitochondria between
those two lines. Results: In contrast to U937 cells, MKN45 gastric cancer cells revealed delayed response in release of mitochondrial
cytochrome c into the cytosol following caspase 3 activation. In signal pathways downstream of caspase 3 cleavage, of the
three substrates detected, poly (ADP-ribose) polymerase (PARP) and PKC (protein kinase c) %thou were not activated in MKN45
cells compared with U937 cells, resulting in delayed appearance of DNA ladder formation during CDDP-induced apoptosis. MKN45
constitutively expressed cIAP1, regardless of CDDP treatment, compared with no expression in U937. Drug sensitivity testing
showed that MKN45 was more resistant to CDDP than U937 cells. Conclusion: We demonstrated that there is a delayed mitochondrial
response and incomplete activation of caspase 3 in MKN45 gastric cancer cells compared with U937 leukemia cells. In addition,
there was endogenous cIAP1 expression in MKN45 cells, which may be a factor in the presumed anti-apoptotic system in these
human gastric cancer cells. |
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ISSN: | 0250-7005 1791-7530 |