Abstract
β-adrenergic signaling is thought to facilitate cancer progression and blockade of β-adrenergic receptors (β-ARs) may slow down tumor growth. A possible role of β3-ARs in tumor growth has not been investigated so far and the lack of highly specific antagonists makes difficult the evaluation of this role. In the present study, β3-AR expression in mouse B16F10 melanoma cells was demonstrated and the effects of two widely used β3-AR blockers, SR59230A and L-748,337, were evaluated in comparison with propranolol, a β1-/β2-AR blocker with poor affinity for β3-ARs, and with siRNAs targeting specific β-ARs. Both SR59230A and L-748,337 reduced cell proliferation and induced apoptosis, likely through the involvement of the inducible isoform of nitric oxide synthase. In addition, hypoxia upregulated β3-ARs and vascular endothelial growth factor (VEGF) in B16F10 cells, whereas SR59230A or L-748,337 prevented the hypoxia-induced VEGF upregulation. Melanoma was induced in mice by inoculation of B16F10 cells. Intra-tumor injections of SR59230A or L-748,337 significantly reduced melanoma growth by reducing cell proliferation and stimulating apoptosis. SR59230A or L-748,337 treatment also resulted in significant decrease of the tumor vasculature. The decrease in tumor vasculature was due to apoptosis of endothelial cells and not to downregulation of angiogenic factors. These results demonstrate that SR59230A and L-748,337 significantly inhibit melanoma growth by reducing tumor cell proliferation and activating tumor cell death. In addition, both drugs reduce tumor vascularization by inducing apoptosis of endothelial cells. Together, these findings indicate β3-ARs as promising, novel targets for anti-cancer therapy.
Key message
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β3-ARs are expressed in B16F10 melanoma cells
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β3-ARs are involved in B16F10 cell proliferation and apoptosis
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Reduced β3-AR function decreases the growth of melanoma induced by B16F10 cell inoculation
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Drugs targeting β3-ARs reduce tumor vasculature
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β3-ARs can be regarded as promising, novel targets for anti-cancer therapy
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Acknowledgements
This work was supported by a grant of the Ente Cassa di Risparmio of Florence to LF. We thank Dr. Antonio Gazzano and Gino Bertolini for their assistance in maintaining the mouse colony. We also thank Dr. Elisabetta Catalani (Department for Innovation in Biological, Agro-food and Forest systems, University of Tuscia, Italy) and Dr. Irene Fornaciari (Department of Biology, University of Pisa) for helping in the double-label immunohistochemistry and confocal microscopy, Dr. Francesca Felice (Department of Surgical, Medical and Molecular Pathology and Critic Area, University of Pisa) for cytofluorimetric analysis, and Dr. Valentina Latina for assistance in the early stage of this work.
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Massimo Dal Monte and Giovanni Casini contributed equally to this study.
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Dal Monte, M., Casini, G., Filippi, L. et al. Functional involvement of β3-adrenergic receptors in melanoma growth and vascularization. J Mol Med 91, 1407–1419 (2013). https://doi.org/10.1007/s00109-013-1073-6
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DOI: https://doi.org/10.1007/s00109-013-1073-6