Melatonin Reduces Angiogenesis in Serous Papillary Ovarian Carcinoma of Ethanol-Preferring Rats

Autor(es)

Zonta, Yohan Ricci ; Martinez, Marcelo ; Camargo, Isabel Cristina C. ; Domeniconi, Raquel F. ; Lupi Junior, Luiz Antonio ; Pinheiro, Patricia Fernanda F. ; Reiter, Russel J. ; Martinez, Francisco Eduardo ; Chuffa, Luiz Gustavo A.

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES; v. 18, n. 4, p. 16-pg., 2017-04-01.

Resumo

Angiogenesis is a hallmark of ovarian cancer (OC); the ingrowth of blood vessels promotes rapid cell growth and the associated metastasis. Melatonin is a well-characterized indoleamine that possesses important anti-angiogenic properties in a set of aggressive solid tumors. Herein, we evaluated the role of melatonin therapy on the angiogenic signaling pathway in OC of an ethanol-preferring rat model that mimics the same pathophysiological conditions occurring in women. OC was chemically induced with a single injection of 7,12-dimethylbenz(a) anthracene (DMBA) under the ovarian bursa. After the rats developed serous papillary OC, half of the animals received intraperitoneal injections of melatonin (200 mu g/100 g body weight/day) for 60 days. Melatonin-treated animals showed a significant reduction in OC size and microvessel density. Serum levels of melatonin were higher following therapy, and the expression of its receptor MT1 was significantly increased in OC-bearing rats, regardless of ethanol intake. TGF beta 1, a transforming growth factor-beta1, was reduced only after melatonin treatment. Importantly, vascular endothelial growth factor (VEGF) was severely reduced after melatonin therapy in animals given or not given ethanol. Conversely, the levels of VEGF receptor 1 (VEGFR1) was diminished after ethanol consumption, regardless of melatonin therapy, and VEGFR2 was only reduced following melatonin. Hypoxia-inducible factor (HIF)-1 alpha was augmented with ethanol consumption, and, notably, melatonin significantly reduced their levels. Collectively, our results suggest that melatonin attenuates angiogenesis in OC in an animal model of ethanol consumption; this provides a possible complementary therapeutic opportunity for concurrent OC chemotherapy. (AU)

• Processo FAPESP: 13/02466-7 - Indução tumoral ovariana e influência da melatonina sobre o processo inflamatório via sinalização mediada pelo receptor Toll-like 4 em ratas UChB
• Beneficiário: Luiz Gustavo de Almeida Chuffa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/03993-9 - Efeito do imunomodulador P-MAPA associado a interleucina-12 no Câncer de Ovário: abordagens in vitro e in vivo sobre o processo inflamatório e sistema imune
• Beneficiário: Luiz Gustavo de Almeida Chuffa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/16315-6 - Indução tumoral ovariana e influência da terapia com melatonina sobre a angiogênese em ratas UChB
• Beneficiário: Yohan Ricci Zonta
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica