Impact of Environmental Light-Dark Conditions on Gut Melatonin in a Surface-dwelling Carp Catla catla (original) (raw)

Abstract

The present study was performed on Indian major carp Catla catla, which because of its natural surface dwelling habit maintains close contact with environmental light and thereby considered as an ideal model for study of photo-response mechanisms in any melatonin synthesizing tissue. The study carryout on carp under natural photo-thermal conditions revealed that the concentrations of melatonin (N-acetyl-5-methoxytryptamine) and the band intensity of a ~23kDa arylalkylamine N-acetyltransferase (AANAT) protein, the key regulator of melatoninergic pathway in each (anterior, middle and hind) segment of gut irrespective of sampling months, undergo significant diurnal variations with a peak at midday, while both the variables in the pineal and melatonin in serum show a peak either in late night (in March) or at midnight (in the remaining part of year). Statistical analysis of the data for searching a temporal relationship between the profiles of melatonin in gut, pineal and serum, as well...

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