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Pinealocytes and astrocytes are the main cell types in the pineal gland. The objective of this work was to investigate the interactions between astrocytes and pinealocytes as a part of the glutamate inhibitory effect on melatonin synthesis. Rat pinealocytes isolated or in coculture with astrocytes were incubated with glutamate in the presence of norepinephrine, and the melatonin content, was quantified. The expression of glutamate receptors, the intracellular calcium content and the NF-<jats:italic>\u03ba<\/jats:italic>B activation were analyzed in astrocytes and pinealocytes. TNF-<jats:italic>\u03b1<\/jats:italic>'s possible mediation of the effect of glutamate was also investigated. The results showed that glutamate's inhibitory effect on melatonin synthesis involves interactions between astrocytes and pinealocytes, possibly through the release of TNF-<jats:italic>\u03b1<\/jats:italic>. Moreover, the activation of the astrocytic NF-<jats:italic>\u03ba<\/jats:italic>B seems to be a necessary step. In astrocytes and pinealocytes, AMPA, NMDA, and group I metabotropic glutamate receptors were observed, as well as the intracellular calcium elevation. In conclusion, there is evidence that the modulation of melatonin synthesis by glutamate involves paracrine interactions between pinealocytes and astrocytes through the activation of the astrocytic NF-<jats:italic>\u03ba<\/jats:italic>B transcription factor and possibly by subsequent TNF-<jats:italic>\u03b1<\/jats:italic>release.<\/jats:p>","DOI":"10.1155\/2013\/618432","type":"journal-article","created":{"date-parts":[[2013,8,5]],"date-time":"2013-08-05T21:22:06Z","timestamp":1375737726000},"page":"1-14","source":"Crossref","is-referenced-by-count":25,"title":["Modulation of Pineal Melatonin Synthesis by Glutamate Involves Paracrine Interactions between Pinealocytes and Astrocytes through NF-<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mrow><mml:mi>\u03ba<\/mml:mi><\/mml:mrow><\/mml:math>B Activation"],"prefix":"10.1155","volume":"2013","author":[{"given":"Darine","family":"Villela","sequence":"first","affiliation":[{"name":"Laboratory of 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