Estrogen-signaling pathway: a link between breast cancer and melatonin oncostatic actions

Cancer Detection and Prevention
Samuel CosEmilio J Sánchez-Barceló

Abstract

Melatonin exerts oncostatic effects on different kinds of tumors, especially on endocrine-responsive breast cancer. The most common conclusion is that melatonin reduces the incidence and growth of chemically induced mammary tumors, in vivo, and inhibits the proliferation and metastatic behavior of human breast cancer cells, in vitro. Both studies support the hypothesis that melatonin oncostatic actions on hormone-dependent mammary tumors are mainly based on its anti-estrogenic actions. Two different mechanisms have been proposed to explain how melatonin reduces the development of breast cancer throughout its interactions with the estrogen-signaling pathways: (a) the indirect neuroendocrine mechanism which includes the melatonin down-regulation of the hypothalamic-pituitary reproductive axis and the consequent reduction of circulating levels of gonadal estrogens and (b) direct melatonin actions at tumor cell level. Melatonin's direct effect on mammary tumor cells is that it interferes with the activation of the estrogen receptor, thus behaving as a selective estrogen receptor modulator. Melatonin also regulates the activity of the aromatases, the enzymes responsible for the local synthesis of estrogens, thus behaving as a select...Continue Reading

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