Abstract
Recent studies demonstrate that the receptor tyrosine kinase (TK) Ron is tumorigenic when overexpressed and plays a role in regulating skin homeostasis. We hypothesized that Ron signaling promotes skin carcinogenesis. To test this hypothesis, mice deficient in the TK domain of Ron (TK−/− mice) were crossed with v-Ha-ras (Tg.AC) transgenic mice; the resulting TK−/− Tg.AC+/− mice, and their controls, were utilized in a model of chemically induced Ras-mediated skin carcinogenesis. The mice were treated with 2.5 μg of 12-O-tetradecanoylphorbol-13-acetate applied weekly to the shaved back of 36 control (TK+/+ Tg.AC+/−) and 35 experimental (TK−/− Tg.AC+/−) mice. In an analysis of the resulting papillomas, a reduction in cellular proliferation and papilloma volume was found in the TK−/− Tg.AC+/− mice compared to controls. Further, Ron protein expression was upregulated during papilloma formation. Ablation of Ron signaling resulted in partial defects in MAPK and Akt signaling that may account for the decreased papilloma growth in the TK−/− Tg.AC+/− mice. The papilloma-bearing mice were monitored for the occurrence of malignant skin tumors and other malignant tumor types for a period of 48 weeks. Loss of Ron receptor signaling significantly reduced the percent of papillomas that underwent malignant conversion as well as the number of mice developing other malignant tumor types. In conclusion, these studies demonstrate that Ron signaling augments papilloma growth and malignant conversion in vivo.
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Abbreviations
- HGFL:
-
hepatocyte growth factor-like protein
- HGF:
-
hepatocyte growth factor
- TK:
-
tyrosine kinase
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Acknowledgements
We wish to acknowledge Drs Sandra Degen, Franklin O Smith and Mike Leonis for insightful comments. We also wish to thank Matt Mauck for the valuable technical assistance, Dr James Lessard for kindly providing the anti-C4 actin antibodies and Dr Joe Palumbo for kindly providing the pDCR-HRas construct. This work was supported in part by research grants from the Ohio Cancer Research Associates (SEW), from the American Cancer Society 92-026-09 (ELC) and from the National Institutes of Health HD-36888 (SEW) as well as T32 HD43005-01 (ELC).
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Chan, E., Peace, B., Collins, M. et al. Ron tyrosine kinase receptor regulates papilloma growth and malignant conversion in a murine model of skin carcinogenesis. Oncogene 24, 479–488 (2005). https://doi.org/10.1038/sj.onc.1208231
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DOI: https://doi.org/10.1038/sj.onc.1208231
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