Dopamine-dependent cyclic AMP generating system in chick retina and its relation to melatonin biosynthesis☆
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Cited by (13)
Physiology and pharmacology of melatonin in relation to biological rhythms
2009, Pharmacological ReportsCitation Excerpt :D4/D2-dopamine receptors appear to be involved in the phase-shifting effect of light on the circadian melatonin/AANAT rhythm in the retina of Xenopus [53], but not the chicken [351]. D4-dopamine receptors that regulate melatonin biosynthesis in the retina may be indirectly linked, in a negative manner, to the cAMP generating system [136, 354]. Melatonin receptors were originally divided into two classes, ML1 and ML2, based on their different affinity and binding kinetics for an agonist radioligand 2-[125I]iodomelatonin ([125I]Mel), and differential pharmacological profiles of synthetic ligands.
Dopamine D4 receptors regulate intracellular calcium concentration in cultured chicken cone photoreceptor cells: Relationship to dopamine receptor-mediated inhibition of cAMP formation
2008, Brain ResearchCitation Excerpt :Dopamine and quinpirole inhibit the stimulation of cAMP formation in response to K+-evoked depolarization, which opens voltage-gated Ca2+ channels, but have no effect on the stimulation of cAMP elicited by the Ca2+ ionophore A23187. Moreover, quinpirole had no effect on forskolin- or calmodulin-stimulated adenylyl cyclase activity in membranes prepared from the cultured cells, consistent with previous studies that were unable to show an effect of quinpirole on adenylyl cyclase activity in chick retina homogenate (Zawilska et al., 1995). These findings suggest that dopamine D4 receptors may not be directly coupled to adenylyl cyclase and that activation of dopamine receptors on chicken photoreceptor cells reduces cAMP formation, at least in part, by reducing Ca2+ influx through voltage-gated channels.
Melatonin time line: From discovery to therapy
2011, Melatonin in the Promotion of Health: Second Edition
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Part of these data were presented at the International Symposium “Eye-Pineal Relationships”, held in Łódź, Poland (21–25 September 1994) and organized by J.Z. Nowak and R.J. Reiter. J.Z. Nowak acted as executive editor in the refereeing of this work.