Abstract
Background
Hemangiomas are benign vascular tumors that are characterised by excessive angiogenesis. While there is no definitive treatment for these tumors, several angiogenesis inhibitors, including bleomycin, have been employed. To better understand the mechanism of bleomycin in accelerating haemangioma regression, we investigated the effects of the drug on hemangiomagenesis using a previously described mouse hemangioma model.
Materials and methods
The effects of bleomycin were tested in mice injected with endothelioma cells to induce hemangioma development. At termination, tissue samples from bleomycin-treated and control mice were stained with hematoxylin and eosin for histological examination. Bcl-2, flk-1 and vWF expression were studied by immunofluorescence microscopy. Hematological analysis was undertaken using a hemocounter. Akt activity was analyzed in tissue homogenates and endothelioma cells using ELISA. Also, caspase activity was analysed in endothelioma cells by ELISA.
Results
Bleomycin inhibited tumor growth in vivo in a dose-dependant manner. Our findings also revealed that bleomycin inhibited Akt activation and suppressed bcl-2. In vitro bleomycin increased caspase activation.
Conclusion
Our observations reveal possible mechanisms for the inhibitory effects of bleomycin on hemangiomagenesis, and raise the possibility that bcl-2 might be an important therapeutic target in the treatment of hemangiomas.
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Acknowledgments
We thank Dr Ben Loos (Department of Physiological Sciences, Stellenbosch University) for his assistance with fluorescence microscopy and Prof Piet Bekker (Biostats Unit, Medical Research Foundation) for his assistance with statistical analysis. This study was supported by the National Research Foundation, the Medical Research Council and the University of Pretoria.
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Mabeta, P., Pepper, M.S. Inhibition of hemangioma development in a syngeneic mouse model correlates with bcl-2 suppression and the inhibition of Akt kinase activity. Angiogenesis 15, 131–139 (2012). https://doi.org/10.1007/s10456-011-9248-7
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DOI: https://doi.org/10.1007/s10456-011-9248-7