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Characterization of melatonin synthesis in the gastrointestinal tract of rainbow trout (Oncorhynchus mykiss): distribution, relation with serotonin, daily rhythms and photoperiod regulation
Melatonin production in the rainbow trout gut: its location, link to serotonin, daily patterns, and light cycle effects
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Abstract
Melatonin was detected in all regions of the rainbow trout gastrointestinal tract, with higher concentrations in the muscular wall than in the mucosa.
- Melatonin synthesis occurs locally in the gastrointestinal tract of rainbow trout.
- Serotonin (5-HT) levels showed a similar distribution pattern to melatonin across the GIT.
- Transcripts for enzymes involved in melatonin synthesis were more abundant in the mucosa than in the muscular wall.
- Pinealectomy did not impact melatonin levels in the midgut and hindgut during day or night.
- Daily rhythms were not observed for melatonin content in gut tissues, although increases were noted during the late light phase and at midnight.
- The abundance of melatonin synthesis enzyme mRNAs exhibited clear daily rhythms, with peaks occurring at night, even under constant darkness.
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