Rapamycin Inhibits Growth of Premalignant and Malignant Mammary Lesions in a Mouse Model of Ductal Carcinoma In situ
| Autor: | Ruria Namba, Craig K. Abbey, Robert D. Cardiff, Jeffrey P. Gregg, Lawrence J. T. Young, Alexander D. Borowsky, Carol L. MacLeod, Clifford G. Tepper, Jinyi Qi, Lisa Kim, Patrizia Damonte |
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| Rok vydání: | 2006 |
| Předmět: |
Male
Cancer Research Pathology medicine.medical_specialty Time Factors Angiogenesis Antigens Polyomavirus Transforming Mammary gland Apoptosis Mice Transgenic Biology Lesion Mice Phosphatidylinositol 3-Kinases Cell Line Tumor medicine Animals Phosphorylation PI3K/AKT/mTOR pathway Cell Proliferation Sirolimus Antibiotics Antineoplastic Dose-Response Relationship Drug Cell growth TOR Serine-Threonine Kinases Carcinoma in situ Mammary Neoplasms Experimental Ductal carcinoma medicine.disease Carcinoma Intraductal Noninfiltrating medicine.anatomical_structure Oncology Positron-Emission Tomography Female medicine.symptom Precancerous Conditions Protein Kinases Signal Transduction |
| Zdroj: | Clinical Cancer Research. 12:2613-2621 |
| ISSN: | 1557-3265 1078-0432 |
| DOI: | 10.1158/1078-0432.ccr-05-2170 |
| Popis: | Purpose: Rapamycin has been shown to have antitumor effects in various tumor models. To study the effect of rapamycin at different stages of breast cancer development, we used two unique mouse models of breast cancer with activated phosphatidylinositol 3-kinase (PI3K) pathway. Met-1 tumors are highly invasive and metastatic, and mammary intraepithelial neoplasia-outgrowths (MIN-O), a model for human ductal carcinoma in situ, are transplantable premalignant mammary lesions that develop invasive carcinoma with predictable latencies. Both of these models were derived from mammary lesions in Tg(MMTV-PyV-mT) mice. Experimental Design: Met-1 tumors were used to study the effect of rapamycin treatment on invasive disease. Transplanted MIN-O model was used to study the effect of rapamycin on premalignant mammary lesions. Animals were in vivo micro–positron emission tomography imaged to follow the lesion growth and transformation to tumor during the treatment. Cell proliferation, angiogenesis, and apoptosis was assayed by immunohistochemistry. Results: Rapamycin inhibited in vitro tumor cell proliferation and in vivo Met-1 tumor growth. The growth inhibition was correlated with dephosphorylation of mammalian target of rapamycin (mTOR) targets. Rapamycin treatment significantly reduced the growth of the premalignant MIN-O lesion, as well as tumor incidence and tumor burden. Growth inhibition was associated with reduced cell proliferation and angiogenesis and increased apoptosis. Conclusions: In PyV-mT mouse mammary models, rapamycin inhibits the growth of premalignant lesions and invasive tumors. Although the inhibitory effect of rapamycin was striking, rapamycin treatment did not completely obliterate the lesions. |
| Databáze: | OpenAIRE |
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