Up-regulation of ras-GAP genes is reversed by a MEK inhibitor and doxorubicin in v-Ki-ras-transformed NIH/3T3 fibroblasts |
| |
Authors: | Hashii Minako Fukuda Mitsunori Nomura Hideki Ito Naoko Takahashi Hiroto Hattori Seisuke Mikoshiba Katsuhiko Noda Makoto Higuchi Yoshihiro |
| |
Institution: | Department of Biophysical Genetics, Kanazawa University Graduate School of Medicine, Kanazawa, Japan. mhashii@med.kanazawa-u.ac.jp |
| |
Abstract: | Ras-GTPase-activating proteins (Ras-GAPs) have been implicated both as suppressors of Ras and as effectors in regulating cellular activities. To study whether Ras-GAPs have roles in tumor cell survival or not, mRNA levels of ras-related genes were measured in v-Ki-ras-transformed (DT) and the parental NIH/3T3 cells, using real-time PCR. mRNA levels of p120-Gap, Gap1(m), and PIK3CA were increased in DT cells compared with NIH/3T3 cells. p120-Gap and PIK3CA genes were induced by addition of serum or epidermal growth factor to serum-starved DT cells. Three anti-cancer drugs, an ERK kinase (MEK) inhibitor PD98059, a topoisomerase II poison doxorubicin (adriamycin), and a histone deacetylase inhibitor trichostatin A, selectively blocked the overexpression of p120-Gap and Gap1(m) genes in DT cells. These drugs also caused reversion of DT cells to the adherent shape associated with growth arrest. Our results suggest that p120-Gap and Gap1(m) genes provide important biomarkers for cancer therapies. |
| |
Keywords: | ras ras-GAP Gap1m Expression MEK Doxorubicin Trichostatin A |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|