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• W2076820121 abstract "The gastrointestinal tract of vertebrate species contains melatonin, which participates in several physiological functions. Some of these effects are mediated via specific membrane receptors (MT(1) and MT(2)). In the present study, the distribution of the MT(2) receptor protein in the gastrointestinal tract was localized, and changes in MT(2) receptor density were observed in relation to the expected circadian changes in melatonin concentrations. Immunohistochemistry was performed in the rat stomach, duodenum, colon and pancreas. The amount of MT(2) was determined by Western blot. Melatonin concentrations were measured by radioimmunoassay (RIA). In the stomach, duodenum and colon, the most intense immunoreactivity was observed in the Muscularis mucosae and in the Muscularis externa. In the pancreas, the immunolabelling was less intense. There was a clear daily rhythm of melatonin concentrations in the stomach, duodenum and pancreas, with higher levels during the dark period. The density of MT(2) receptors did not exhibit circadian variation. Moreover, circadian changes in melatonin concentrations were not found in the colon. The density of MT(2) was the highest in the colon. Our results provide evidence for the heterogeneous distribution of MT(2) receptors in different parts and layers of the gastrointestinal tract, which could indicate a physiological role of melatonin in the gastrointestinal tract." @default.
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• W2076820121 date "2010-01-01" @default.
• W2076820121 modified "2023-10-12" @default.
• W2076820121 title "Immunohistochemical definition of MT2 receptors and melatonin in the gastrointestinal tissues of rat" @default.
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• W2076820121 doi "https://doi.org/10.1016/j.acthis.2008.03.004" @default.
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