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The c-kit tyrosine kinase inhibitor STI571 for colorectal cancer therapy.

The c-kit tyrosine kinase inhibitor STI571 exhibits a substantial therapeutic activity in patients with chronic myeloid leukemia and gastrointestinal stromal tumors respectively associated with constitutive activation of the BCR-ABL and c-kit tyrosine kinases. Human colorectal tumors also express the c-kit proto-oncogene. The present study focuses on the anticancer activity of STI571 in human colorectal tumor cells in vitro and in vivo. The c-kit receptor was identified as a M(r) 145,000 immunoreactive band in human colon cancer cells HT29, HCT8/ S11, and HCT116. Cellular invasion induced by 10 ng/ml stem cell factor (EC(50) = 3 ng/ml) in HT29 cells was blocked by 1 micro M STI571 (IC(50) = 56 nM) and pharmacological inhibitors of several oncogenic signaling pathways, namely, phosphatidylinositol 3-kinase (LY294002), Rho GTPases (Clostridium botulinum exoenzyme C3 transferase), and Rho-kinase (Y27632). STI571 inhibited HT29 cell proliferation (IC(50) = 6 micro M) and induced apoptosis in vitro. These cellular effects were associated with a decrease in tumor growth. We also demonstrated that stem cell factor is a proangiogenic factor in vivo and in vitro. These encouraging results warrant further preclinical investigations and clinical trials on the use of the c-kit inhibitor STI571 as a chemotherapeutic agent in colon cancer prevention and in treatment of advanced colorectal cancers associated with liver metastases.[1]

References

  1. The c-kit tyrosine kinase inhibitor STI571 for colorectal cancer therapy. Attoub, S., Rivat, C., Rodrigues, S., Van Bocxlaer, S., Bedin, M., Bruyneel, E., Louvet, C., Kornprobst, M., André, T., Mareel, M., Mester, J., Gespach, C. Cancer Res. (2002) [Pubmed]
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