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- W2017112346 abstract "Exposure of dark-adapted chicks to near ultraviolet (UV-A) light significantly decreased melatonin (MEL) content and the activity of serotonin N-acetyltransferase (AA-NAT; the penultimate and key regulatory enzyme in MEL production) in the pineal glands. Significant reduction in MEL level and AA-NAT activity was also found in pineals of animals whose heads were covered with black opaque tape, an observation suggesting that in the chicken UV-A light perceived by the eyes alone is capable of affecting MEL synthesis in the pineal gland. Covering the chick's eyes, in addition to the head, totally blocked the studied UV-A action. Although SCH 23390 (a selective D1-dopamine receptor antagonist), injected directly into both eyes at a dose of 10 nmol/eye, prevented the decline in pineal AA-NAT activity produced by retinal illumination with white light, the drug did not modify the UV-A light-evoked decrease in the enzyme activity. MK-801 (a selective antagonist of NMDA glutamate receptors; 1 nmol/eye) abolished the suppressive action of UV-A light on pineal AA-NAT activity, but it was inactive in the case of white light. Intraocularly injected sulpiride and CNQX (selective antagonists of D2-dopamine and AMPA/kainite glutamate receptors, respectively) had no effect on the actions of both UV-A and white light (acting on the eyes only) on pineal AA-NAT activity. It is concluded that in the chick retinally perceived UV-A light generates a signal which suppresses MEL production in the pineal gland. At the level of the retina, such signal does not involve dopamine, but is dependent on the stimulation of NMDA glutamate receptors." @default.
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- W2017112346 date "2005-05-01" @default.
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- W2017112346 title "Near-ultraviolet light perceived by the retina generates the signal suppressing melatonin synthesis in the chick pineal gland—an involvement of NMDA glutamate receptors" @default.
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- W2017112346 doi "https://doi.org/10.1016/j.neulet.2004.12.075" @default.
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