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Angiogenesis inhibitor TNP-470 suppresses tumorigenesis in rat urinary bladder
Y Tanaka1, H Kawamata, K Fujimoto
1Department of Pathology, Northwestern University Medical School, Chicago, Illinois 60611-3008, USA.
Purpose:
The efficacy of the anti-angiogenic factor TNP-470, an analogue of fumagillin, in controlling the development of bladder tumors was investigated.
Materials And Methods:
The anti-angiogenic activity of TNP-470 was evaluated in vitro by its capacity to suppress the growth and migration of bovine capillary endothelial cells. To investigate its effect in vivo on the development of tumors, we instilled 0.5 microgram of TNP-470 dissolved in rat urine into heterotopically transplanted rat urinary bladders in which carcinogenesis had been initiated by N-methyl-N-nitrosourea.
Results:
In vitro, TNP-470 selectively inhibited the growth and migration of endothelial cells. Instillation of TNP-470 shortly after treatment with carcinogen reduced the tumor incidence significantly (p < 0.05) as compared with that in control animals receiving urine only.
Conclusions:
TNP-470 suppresses the development of bladder tumors when the treatment is started at an early stage of neoplasia. It may be useful in preventing recurrences or new growth of bladder tumors.
Insights
The anti-angiogenic factor TNP-470 effectively inhibits bladder tumor development by suppressing endothelial cell growth. Early-stage treatment with TNP-470 shows promise in preventing tumor recurrence and new growth.
Area of Science:
- Oncology
- Pharmacology
- Urology
Background:
- Angiogenesis plays a critical role in tumor growth and metastasis.
- Anti-angiogenic therapies aim to inhibit the formation of new blood vessels that feed tumors.
- TNP-470, a fumagillin analogue, exhibits anti-angiogenic properties.
Purpose of the Study:
- To investigate the efficacy of TNP-470 in controlling bladder tumor development.
- To evaluate the in vitro and in vivo effects of TNP-470 on tumor growth.
Main Methods:
- In vitro assessment of TNP-470's effect on bovine capillary endothelial cell growth and migration.
- In vivo study using a rat bladder cancer model, with TNP-470 instilled via urine after carcinogen exposure.
- Tumor incidence was compared between TNP-470 treated and control groups.
Main Results:
- TNP-470 selectively inhibited endothelial cell growth and migration in vitro.
- Early instillation of TNP-470 significantly reduced bladder tumor incidence in rats (p < 0.05).
- Control animals receiving only urine showed higher tumor incidence.
Conclusions:
- TNP-470 demonstrates efficacy in suppressing bladder tumor development when initiated early.
- The anti-angiogenic factor TNP-470 may serve as a preventative measure against bladder tumor recurrence and new tumor formation.