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- W2037272800 abstract "In previous studies we showed that in mice the pineal gland modulates the immune response via the circadian synthesis and release of melatonin. Exogenous melatonin proved also to exert immunoenhancing effects and to counteract completely the immunologic effect of acute stress. Melatonin was active only in vivo, in mice primed with T-dependent antigens and its effects on the primary antibody response and thymus weight were abolished by the specific opioid antagonist naltrexone. Here we demonstrate that physiologic concentrations of melatonin, in vitro, activated L3T4+ (CD4+) cells to release opioid agonist(s) that can reproduce in vivo the immunoenhancing and anti-stress effects on thymus cellularity and antibody production of melatonin and compete with specific binding of [3H]naloxone to mouse brain membranes. Similar results were obtained when mitogen-activated human immunocompetent cells were incubated with melatonin. In the human model the results were, however, less consistent than those obtained with murine cells, in that only four out of ten blood donors provided cells that were responsive to melatonin. This finding elucidates the mechanism of a novel immuno-neuroendocrine connection with relevant implications for our understanding of the neuroendocrine factors that may influence the immune response in vivo in normal and stressful situations. In addition, it opens new perspectives in a wide range of research fields" @default.
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- W2037272800 date "1990-07-01" @default.
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- W2037272800 title "The pineal neurohormone melatonin stimulates activated CD4+, Thy-1+ cells to release opioid agonist(s) with immunoenhancing and anti-stress properties" @default.
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- W2037272800 doi "https://doi.org/10.1016/0165-5728(90)90031-h" @default.
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