HER kinase activation confers resistance to MET tyrosine kinase inhibition in MET oncogene-addicted gastric cancer cells Journal Article
| Authors: | Bachleitner-Hofmann, T.; Sun, M. Y.; Chen, C. T.; Tang, L.; Song, L.; Zeng, Z.; Shah, M.; Christensen, J. G.; Rosen, N.; Solit, D. B.; Weiser, M. R. |
| Article Title: | HER kinase activation confers resistance to MET tyrosine kinase inhibition in MET oncogene-addicted gastric cancer cells |
| Abstract: | Tumor cells with genomic amplification of MET display constitutive activation of the MET tyrosine kinase, which renders them highly sensitive to MET inhibition. Several MET inhibitors have recently entered clinical trials; however, as with other molecularly targeted agents, resistance is likely to develop. Therefore, elucidating possible mechanisms of resistance is of clinical interest. We hypothesized that collateral growth factor receptor pathway activation can overcome the effects of MET inhibition in MET-amplified cancer cells by reactivating key survival pathways. Treatment of MET-amplified GTL-16 and MKN-45 gastric cancer cells with the highly selective MET inhibitor PHA-665752 abrogated MEK/mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K)/AKT signaling, resulting in cyclin D1 loss and G1 arrest. PHA-665752 also inhibited baseline phosphorylation of epidermal growth factor receptor (EGFR) and HER-3, which are transactivated via MET-driven receptor cross-talk in these cells. However, MET-independent HER kinase activation using EGF (which binds to and activates EGFR) or heregulin-β1 (which binds to and activates HER-3) was able to overcome the growth-inhibitory effects of MET inhibition by restimulating MEK/MAPK and/or PI3K/AKT signaling, suggesting a possible escape mechanism. Importantly, dual inhibition of MET and HER kinase signaling using PHA-665752 in combination with the EGFR inhibitor gefitinib or in combination with inhibitors of MEK and AKT prevented the above rescue effects. Our results illustrate that highly targeted MET tyrosine kinase inhibition leaves MET oncogene-"addicted" cancer cells vulnerable to HER kinase-mediated reactivation of the MEK/MAPK and PI3K/AKT pathways, providing a rationale for combined inhibition of MET and HER kinase signaling in MET-amplified tumors that coexpress EGFR and/or HER-3. Copyright © 2008 American Association for Cancer Research. |
| Keywords: | signal transduction; epidermal growth factor; mitogen activated protein kinase; protein kinase b; controlled study; human tissue; unclassified drug; human cell; antineoplastic agents; cell proliferation; enzyme inhibition; epidermal growth factor receptor; protein; receptor, epidermal growth factor; enzyme activation; drug resistance, neoplasm; enzyme inhibitor; cell line, tumor; transfection; phosphorylation; phosphatidylinositol 3 kinase; protein kinase inhibitors; oncogene; cancer cell; 1-phosphatidylinositol 3-kinase; gefitinib; cell cycle arrest; stomach cancer; indoles; cyclin d1; stomach neoplasms; phosphotransferase; mitogen-activated protein kinase kinases; cell cycle g1 phase; 5 (2,6 dichlorobenzylsulfonyl) 3 [3,5 dimethyl 4 [2 (1 pyrrolidinylmethyl) 1 pyrrolidinylcarbonyl] 1h pyrrol 2 ylmethylene] 1,3 dihydro 2h indol 2 one; sulfones; scatter factor receptor; growth inhibition; n (2,3 dihydroxypropoxy) 3,4 difluoro 2 (2 fluoro 4 iodoanilino)benzamide; protein kinase b inhibitor; proto-oncogene proteins c-met; neu differentiation factor; growth factor receptor; api 2; her 3 protein; her kinase; heregulin beta 1; oncogene met; receptor, erbb-3 |
| Journal Title: | Molecular Cancer Therapeutics |
| Volume: | 7 |
| Issue: | 11 |
| ISSN: | 1535-7163 |
| Publisher: | American Association for Cancer Research |
| Date Published: | 2008-11-01 |
| Start Page: | 3499 |
| End Page: | 3508 |
| Language: | English |
| DOI: | 10.1158/1535-7163.mct-08-0374 |
| PUBMED: | 18974395 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 34" - "Export Date: 17 November 2011" - "CODEN: MCTOC" - "Source: Scopus" |
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