Antitumor effect of a farnesyl protein transferase inhibitor in mammary and lymphoid tumors overexpressing N-ras in transgenic mice.

Abstract

We tested the antineoplastic effect of the farnesyltransferase inhibitor L-744,832 in mammary and lymphoid tumors overexpressing the N-ras proto-oncogene in transgenic mice. Mice bearing mammary tumors were randomly assigned to receive daily 40 mg/kg s.c. injections of this compound (experimental group, n = 6) or vehicle (control group, n = 6) per day for 5.5 weeks. Treatment with the compound significantly reduced the mammary tumor mean growth rate in the experimental group (-0.7 mm3/day), as compared with the control group (+28.2 mm3/day; P < 0.001). There was a significant difference in lymphoma incidence at the end of the treatment between the experimental (0 of 6) and the control (3 of 6) groups (P < 0.05). Therefore, this compound is effective in treating in vivo mammary carcinomas and lymphomas in which an activated N-Ras pathway drives tumorigenesis. The number of apoptotic figures in mammary tumors was significantly higher (P = 0.04) in the experimental (14.7 +/- 8.1) than it was in the control (5.7 +/- 3.5) group, indicating that apoptotic induction could contribute to the mechanism of antitumor activity of this compound. We analyzed the level of processing of N-Ras and H-Ras after immunoprecipitation and Western blotting of protein extracts obtained from mammary tumors treated with L-744,832 or vehicle, either in vivo or in vitro (after primary culture of the same tumors), and from several in vitro treated control cell lines. In all compound-treated mammary tumors and cell lines, H-Ras was mostly unprocessed (more so after in vitro than after in vivo treatment), whereas N-Ras remained mostly processed. Both H-Ras and N-Ras remained fully processed in all vehicle-treated samples. These findings are consistent with a less intense antineoplastic effect of the treatment with the compound in our N-ras model than the effect previously reported for the same compound in H-ras transgenics. In addition, the finding that, in compound-treated mammary tumors, the N-Ras protein remains mainly processed suggests that, in our model, other proteins in addition to Ras may be a target for the compound. Our results and the previous findings of frequent N-ras activation in human hematopoietic malignancies support a role for L-744,832 in the treatment of lymphomas and of mammary carcinomas with an activated N-Ras pathway, as well as the testing of a farnesyl protein transferase inhibitor in humans to establish its clinical relevance.

• Authors: R Mangues, T Corral, N E Kohl, W F Symmans, S Lu, M Malumbres, J B Gibbs, A Oliff, A Pellicer
• Journal: Cancer research (Cancer Res) Vol. 58 Issue 6 Pg. 1253-9 (Mar 15 1998) ISSN: 0008-5472 [Print] United States
• PMID: 9515813 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antineoplastic Agents
• L 744832
• MAS1 protein, human
• Proto-Oncogene Mas
• Methionine
• Alkyl and Aryl Transferases
• Farnesyltranstransferase
• Proto-Oncogene Proteins p21(ras)

Topics

• Alkyl and Aryl Transferases (antagonists & inhibitors)
• Animals
• Antineoplastic Agents (pharmacology)
• Farnesyltranstransferase
• Gene Expression Regulation, Neoplastic
• Genes, ras
• Lymphoma (drug therapy)
• Mammary Neoplasms, Experimental (drug therapy)
• Methionine (analogs & derivatives, pharmacology)
• Mice
• Mice, Transgenic
• Protein Processing, Post-Translational (drug effects)
• Proto-Oncogene Mas
• Proto-Oncogene Proteins p21(ras) (genetics, metabolism)