Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain

In the freshwater catfish, Mystus cavasius, locally known as gulsha, ovarian maturation is triggered by long-day conditions. Using dopaminergic neuronal activity in the brain, the purpose of this study was to identify the brain’s detection of a nocturnal light pulse that induced ovarian development....

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Autores principales:	Muhammad Badruzzaman, Chayon Goswami, Md. Abu Sayed
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Brain Catfish Circadian Dopamine Melatonin Photoperiod Environmental pollution TD172-193.5 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/caff25b0f2b544ebad8edc355b5a33e0
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spelling	oai:doaj.org-article:caff25b0f2b544ebad8edc355b5a33e02021-11-06T04:18:51ZPhotoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain0147-651310.1016/j.ecoenv.2021.112941https://doaj.org/article/caff25b0f2b544ebad8edc355b5a33e02021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0147651321010538https://doaj.org/toc/0147-6513In the freshwater catfish, Mystus cavasius, locally known as gulsha, ovarian maturation is triggered by long-day conditions. Using dopaminergic neuronal activity in the brain, the purpose of this study was to identify the brain’s detection of a nocturnal light pulse that induced ovarian development. Since direct inhibition of pituitary gonadotropin release is exerted by dopamine (DA), it may serve as a neuromodulator of photoperiodic stimulation in teleosts. We studied functional effects of photoperiodicity on dopaminergic rhythmicity in gulsha brain. Nocturnal illumination and Nanda-Hamner photocycles revealed that ovarian development is induced by a 1 h light pulse between zeitgeber time (ZT) 12 and 13. Daily fluctuations in DA, 3, 4-dihydroxyphenylacetic acid (DOPAC) and DOPAC/DA were observed under a 12L:12D photoperiod. Fish exhibited increased levels during the daytime and decreased levels at night. Rhythmic patterns of dopaminergic activity also showed clear circadian oscillations under constant light, but not constant dark conditions. After 7 days of exposure to long photoperiod (14L:10D), DA, DOPAC and DOPAC/DA in the brain at ZT12 and ZT16 were significantly higher than during a short photoperiod (10L:14D). Melatonin-containing water inhibited the release of DA and DOPAC 6 h and 24 h after treatment, respectively, and DOPAC/DA 6 h after treatment. This inhibition was blocked by the melatonin receptor antagonist, luzindole. These results suggest that a 1 h nocturnal light pulse induces ovarian development through alteration of dopaminergic neuronal excitability in the brain, via oscillation in melatonin triggered by photic stimuli, which may interfere with the reproductive endocrine axis in gulsha.Muhammad BadruzzamanChayon GoswamiMd. Abu SayedElsevierarticleBrainCatfishCircadianDopamineMelatoninPhotoperiodEnvironmental pollutionTD172-193.5Environmental sciencesGE1-350ENEcotoxicology and Environmental Safety, Vol 227, Iss , Pp 112941- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Brain Catfish Circadian Dopamine Melatonin Photoperiod Environmental pollution TD172-193.5 Environmental sciences GE1-350
spellingShingle	Brain Catfish Circadian Dopamine Melatonin Photoperiod Environmental pollution TD172-193.5 Environmental sciences GE1-350 Muhammad Badruzzaman Chayon Goswami Md. Abu Sayed Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain
description	In the freshwater catfish, Mystus cavasius, locally known as gulsha, ovarian maturation is triggered by long-day conditions. Using dopaminergic neuronal activity in the brain, the purpose of this study was to identify the brain’s detection of a nocturnal light pulse that induced ovarian development. Since direct inhibition of pituitary gonadotropin release is exerted by dopamine (DA), it may serve as a neuromodulator of photoperiodic stimulation in teleosts. We studied functional effects of photoperiodicity on dopaminergic rhythmicity in gulsha brain. Nocturnal illumination and Nanda-Hamner photocycles revealed that ovarian development is induced by a 1 h light pulse between zeitgeber time (ZT) 12 and 13. Daily fluctuations in DA, 3, 4-dihydroxyphenylacetic acid (DOPAC) and DOPAC/DA were observed under a 12L:12D photoperiod. Fish exhibited increased levels during the daytime and decreased levels at night. Rhythmic patterns of dopaminergic activity also showed clear circadian oscillations under constant light, but not constant dark conditions. After 7 days of exposure to long photoperiod (14L:10D), DA, DOPAC and DOPAC/DA in the brain at ZT12 and ZT16 were significantly higher than during a short photoperiod (10L:14D). Melatonin-containing water inhibited the release of DA and DOPAC 6 h and 24 h after treatment, respectively, and DOPAC/DA 6 h after treatment. This inhibition was blocked by the melatonin receptor antagonist, luzindole. These results suggest that a 1 h nocturnal light pulse induces ovarian development through alteration of dopaminergic neuronal excitability in the brain, via oscillation in melatonin triggered by photic stimuli, which may interfere with the reproductive endocrine axis in gulsha.
format	article
author	Muhammad Badruzzaman Chayon Goswami Md. Abu Sayed
author_facet	Muhammad Badruzzaman Chayon Goswami Md. Abu Sayed
author_sort	Muhammad Badruzzaman
title	Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain
title_short	Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain
title_full	Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain
title_fullStr	Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain
title_full_unstemmed	Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain
title_sort	photoperiodic light pulse induces ovarian development in the catfish, mystus cavasius: possible roles of dopamine and melatonin in the brain
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/caff25b0f2b544ebad8edc355b5a33e0
work_keys_str_mv	AT muhammadbadruzzaman photoperiodiclightpulseinducesovariandevelopmentinthecatfishmystuscavasiuspossiblerolesofdopamineandmelatonininthebrain AT chayongoswami photoperiodiclightpulseinducesovariandevelopmentinthecatfishmystuscavasiuspossiblerolesofdopamineandmelatonininthebrain AT mdabusayed photoperiodiclightpulseinducesovariandevelopmentinthecatfishmystuscavasiuspossiblerolesofdopamineandmelatonininthebrain
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Photoperiodic light pulse induces ovarian development in the catfish, Mystus cavasius: Possible roles of dopamine and melatonin in the brain

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