Abstract
Recent research in our laboratory has indicated that in sparrows the visual suprachiasmatic nucleus (vSCN) is metabolically rhythmic such that 2-deoxy[14C]glucose (2DG) uptake and specific binding of 2[125I]iodomelatonin (IMEL) are high during subjective day for up to 10 circadian cycles in constant darkness (DD). These rhythms damp to arrhythmicity in pinealectomized birds (PINX). The present study was designed to test the hypothesis that exogenous melatonin rhythmically applied can restore disrupted behavioral and cerebral rhythmicity. Pinealectomized house sparrows were placed in constant dim light and allowed to become arrhythmic. Experimental birds received 0.86 mM melatonin in 0.01% ethanol (ETOH) to drink for 12 of every 24 h for 14 days. Control birds received 0.01% ETOH only. Behavioral rhythmicity was restored by melatonin but not by ETOH. Birds were injected with 2DG 6 or 18 h following the beginning of melatonin (for experimental birds: MT06 and MT18 respectively) or ETOH (for control birds: ET06 and ET18 respectively) administration, allowed to survive 1 h and killed for 2DG and IMEL autoradiography. The data indicated 2DG rhythmicity such that uptake was high at MT18 in vSCN and several visual, auditory and limbic system structures in birds receiving melatonin but not in birds receiving ETOH. Similarly, IMEL binding rhythms were restored in vSCN and other visual, auditory and limbic system structures in birds receiving melatonin but not in those receiving ETOH. These data indicate that melatonin cycles are responsible for generating and/or driving a wide array of cerebral metabolic rhythms and that this influence is inhibitory.
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Lu, J., Cassone, V.M. Daily melatonin administration synchronizes circadian patterns of brain metabolism and behavior in pinealectomized house sparrows,Passer domesticus . J. Comp. Physiol. 173, 775–782 (1993). https://doi.org/10.1007/BF02451908
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DOI: https://doi.org/10.1007/BF02451908