Pineal Gland's Role in Breast Cancer: Melatonin and Peptides Show Promise

The pineal gland, a small endocrine gland in the brain, produces hormones like melatonin that regulate sleep-wake cycles and other physiological processes. Emerging research suggests a significant link between pineal function and the development of breast cancer. This review specifically addresses how modulation of pineal gland function influences mammary carcinogenesis and explores the therapeutic potential of its hormones and peptides.

The review consistently demonstrates that inhibiting pineal function, either through pinealectomy (surgical removal of the pineal gland) or exposure to a constant light regimen, significantly stimulates mammary carcinogenesis in rodent models. Conversely, light deprivation was shown to inhibit this carcinogenic process. Epidemiological data further supports these experimental findings, revealing an increased risk of breast cancer in night shift workers and a decreased risk in blind women. Treatment with the pineal indole hormone melatonin consistently inhibited mammary carcinogenesis in pinealectomized rats, as well as in animals maintained under standard light/dark cycles or constant illumination. The pineal peptide preparation Epithalamin and the synthetic tetrapeptide Epitalon (Ala-Glu-Asp-Gly) were identified as potent inhibitors of mammary carcinogenesis in rodents, showcasing their significant anti-cancer potential.