Abstract
Expression of an interferon inducible gene 6-16, G1P3, increases not only in type I interferon-treated cells but also in human senescent fibroblasts. However, the function of 6-16 protein is unknown. Here we report that 6-16 is 34 kDa glycosylated protein and localized at mitochondria. Interestingly, 6-16 is expressed at high levels in gastric cancer cell lines and tissues. One of exceptional gastric cancer cell line, TMK-1, which do not express detectable 6-16, is sensitive to apoptosis induced by cycloheximide (CHX), 5-fluorouracil (5-FU) and serum-deprivation. Ectopic expression of 6-16 gene restored the induction of apoptosis and inhibited caspase-3 activity in TMK-1 cells. Thus 6-16 protein has anti-apoptotic function through inhibiting caspas-3. This anti-apoptotic function is expressed through inhibition of the depolarization of mitochondrial membrane potential and release of cytochrome c. By two-hybrid screening, we found that 6-16 protein interacts with calcium and integrin binding protein, CIB/KIP/Calmyrin (CIB), which interacts with presenilin 2, a protein involved in Alzheimer’s disease. These protein interactions possibly play a pivotal role in the regulation of apoptosis, for which further detailed analyses are need. These results overall indicate that 6-16 protein may have function as a cell survival protein by inhibiting mitochondrial-mediated apoptosis.
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Acknowledgements
Yeast L-40 strain and pBTM116/HA for yeast two-hybrid screening were kindly supplied by Dr Y Takai (Osaka University, Japan). Anti-GST rabbit pAb was kindly provided by Dr. M. Nakata (Sumitomo Electric Industries, Japan). Anti-human CIB/KIP/calmyrin antibody was kindly provided by Leslie V. Parise (North Carolina University, USA). A mammalian expression plasmid, pCXN was kindly provided by Dr J. Miyazaki (Osaka University, Japan). This work was supported by Grant-in Aid from the Ministry of Education, Science, Sports and Culture of Japan.
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Tahara, E., Tahara, H., Kanno, M. et al. G1P3, an interferon inducible gene 6-16, is expressed in gastric cancers and inhibits mitochondrial-mediated apoptosis in gastric cancer cell line TMK-1 cell. Cancer Immunol Immunother 54, 729–740 (2005). https://doi.org/10.1007/s00262-004-0645-2
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DOI: https://doi.org/10.1007/s00262-004-0645-2