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[Content of biogenic amines in brain under artificial and natural cooling of animals].

The catecholamines and serotonin contents in different brain areas were studies in rats under hypothermia of 30 degrees and 20-19 degrees C and in Citellus pigmaeus Pallas on the 7th, 15th and 30th day after hibernation. The artificial and natural drop in the body temperature is shown to increase the catecholamines and serotonin contents in cerebral hemispheres, cerebellum, thalamus, hypothalamus and medulla oblongata. A long artificial cooling is accompanied by a decrease in the value of the catecholamines/serotonin ratio in the brain due to an increase in the serotonin content and a long hibernation by redistribution of the content both of catecholamines and serotonin without changing their ratio.

Animals↗
PubMed1985

An immunohistochemical study of seasonal changes in luteinizing hormone-releasing hormone and vasotocin in the forebrain and the neurohypophysis of the toad, Bufo japonicus.

Seasonal changes in luteinizing hormone-releasing hormone (LH-RH) and arginine vasotocin (AVT) were examined immunohistochemically in the toad forebrains and neurohypophyses. Strongly immunoreactive (ir-) LH-RH perikarya, from which dense ir-LH-RH fibers project to the median eminence, were localized in the medial septal nucleus and the nucleus of the diagonal band of Broca in the animals captured in the spring and the autumn. While, in the animals collected in the summer, ir-LH-RH perikarya and fibers were sparse, and immunoreactivity in the median eminences was weak. Artificially induced hibernation decreased the density of ir-LH-RH in the median eminence, in contrast with strong immunoreactivity in the control animals kept at room temperature. The amounts of ir-LH-RH in the median eminences of hibernating toads which were captured shortly before the breeding period varied conspicuously among individuals. The median eminences in migrating toads showed relatively weak LH-RH immunoreactivity. After the breeding, the immunoreactivity returned to the strong level that was observed in the spring and the autumn. These seasonal changes in ir-LH-RH seem to correspond to seasonal reproductive activity in this species. However, significant seasonal variations were not found in ir-AVT.

Acclimatization↗