Targeting mTOR and p53 Signaling Inhibits Muscle Invasive Bladder Cancer In Vivo
| Autor: | Laura Biddick, Vernon E. Steele, Xue-Ru Wu, Venkateshwar Madka, Jagan M.R. Patlolla, Altaf Mohammed, Levy Kopelovich, Chinthalapally V. Rao, Yuting Zhang, Stan Lightfoot, Qian Li, Rheal A. Towner |
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| Rok vydání: | 2016 |
| Předmět: |
Male
0301 basic medicine Cancer Research Pathology medicine.medical_specialty Transgene Urinary Bladder Mice Transgenic Inflammation Biology Article Neovascularization Mice 03 medical and health sciences 0302 clinical medicine In vivo Biomarkers Tumor Polyamines medicine Animals Neoplasm Invasiveness PI3K/AKT/mTOR pathway Cell Proliferation Sirolimus Bladder cancer Neovascularization Pathologic Cell growth Muscles TOR Serine-Threonine Kinases medicine.disease Magnetic Resonance Imaging Gene Expression Regulation Neoplastic 030104 developmental biology Transitional cell carcinoma Urinary Bladder Neoplasms Oncology 030220 oncology & carcinogenesis Cancer research Tumor Suppressor Protein p53 medicine.symptom Signal Transduction |
| Zdroj: | Cancer Prevention Research. 9:53-62 |
| ISSN: | 1940-6215 1940-6207 |
| DOI: | 10.1158/1940-6207.capr-15-0199 |
| Popis: | Urothelial tumors, accompanied by mutations of the tumor suppressor protein TP53 and dysregulation of mTOR signaling, are frequently associated with aggressive growth and invasiveness. We investigated whether targeting these two pathways would inhibit urothelial tumor growth and progression. Six-week-old transgenic UPII-SV40T male mice (n = 15/group) were fed control diet (AIN-76A) or experimental diets containing mTOR inhibitor (rapamycin, 8 or 16 ppm), p53 stabilizing agent [CP31398 (CP), 150 ppm], or a combination. Mice were euthanized at 40 weeks of age. Urinary bladders were collected and evaluated to determine tumor weight and histopathology. Each agent alone, and in combination, significantly inhibited tumor growth. Treatment with rapamycin alone decreased tumor weight up to 67% (P < 0.0001). Similarly, CP showed approximately 77% (P < 0.0001) suppression of tumor weight. The combination of low-dose rapamycin and CP led to approximately 83% (P < 0.0001) inhibition of tumor weight. There was no significant difference in tumor weights between rapamycin and CP treatments (P > 0.05). However, there was a significant difference between 8 ppm rapamycin and the combination treatment. Tumor invasion was also significantly inhibited in 53% (P < 0.005) and 66% (P < 0.0005) mice after 8 ppm and 16 ppm rapamycin, respectively. However, tumor invasion was suppressed in 73% (P < 0.0001) mice when CP was combined with 8 ppm rapamycin. These results suggest that targeting two or more pathways achieve better treatment efficacy than a single-agent high-dose strategy that could increase the risk of side effects. A combination of CP and rapamycin may be a promising method of inhibiting muscle-invasive urothelial transitional cell carcinoma. Cancer Prev Res; 9(1); 53–62. ©2015 AACR. |
| Databáze: | OpenAIRE |
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