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PLCγ contributes to metastasis of in situ-occurring mammary and prostate tumors

Abstract

Phospholipase C-γ (PLCγ) has been implicated in tumor cell motility required for invasiveness and metastasis. Diminished tumor dissemination has been demonstrated in xenograft models, but studies in naturally-occurring tumors are lacking, having been limited by the timing of the interventions. Therefore, we generated mice that express a doxycycline (DOX)-inducible dominant-negative fragment of PLCγ, PLCz; this approach avoids the in utero lethality caused by the absence of PLCγ. As we targeted two de novo-occurring carcinomas of the mammary (MMTV-driven polyoma middle T antigen model, PyVmT) and prostate (TRAMP model) glands, we limited expression to these epithelial cells by driving DOX transactivator from the prostatein C3 promoter. This avoids the confounding variable of potentially abrogating motility in stromal and endothelial cells. These mice developed normally in the presence of DOX, except for limited mammary development if treated before 6 weeks and immaturity of the prostate gland if treated before 2 weeks of age. DOX-mediated induction of PLCz from age 8 to 16 weeks in PyVmT mice decreased the number of lung metastases by >10-fold (P<0.06) without a detectable effect on in situ tumor cell proliferation or tumor size. Lung metastases were also significantly decreased in the TRAMP model in which the mice expressed the PLCz fragment (P<0.05). DOX treatment itself had no effect on tumor size or metastasis in control mice, nor did it affect tumor dissemination in nontransgenic littermates. In conclusion, abrogation of the PLCγ signaling pathway can limit the metastatic potential of carcinomas.

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Acknowledgements

We thank Norman Greenberg for the gift of the TRAMP mice and Dr William Muller for the gift of the MMTV-PyV mice. Dr Peter Barry kindly provided the prostatein promoter construct. This work was supported in part by grants from the Department of Defense Congressionally Mandated Medical Research Program on Prostate and Breast Cancer and a VA Merit Award.

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Correspondence to A Wells.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Shepard, C., Kassis, J., Whaley, D. et al. PLCγ contributes to metastasis of in situ-occurring mammary and prostate tumors. Oncogene 26, 3020–3026 (2007). https://doi.org/10.1038/sj.onc.1210115

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