Abstract
Melatonin is a neurohormone mainly produced by the pineal gland following a circadian rhythm. It is characterized as a pleiotropic factor because it not only regulates the wake-sleep rhythm but also exerts antinociceptive, antidepressant, anxiolytic, and immunomodulating properties. Recent studies suggest that dysregulation of melatonin secretion is associated with the pathogenesis of various autoimmune diseases, such as, rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), and multiple sclerosis (MS). MS is an autoimmune disorder characterized by an abnormal immune response directed against the myelin sheath in the central nervous system, demyelination, oligodendrocyte death, and axonal degeneration. Recent evidence reveals that melatonin secretion is dysregulated in MS patients, suggesting that melatonin could be a potential target for therapeutic intervention. Here, we summarize the available literature regarding the role of melatonin in immune processes relevant for experimental autoimmune encephalomyelitis (EAE), MS, and the current clinical trials of melatonin supplementation in MS patients.
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