[Effect of monoamines and testosterone on hypothalamo-gonadal complex of Japanese quail (an electrophysiological and morphometric study)].
Effects of biogenic amines, testosterone and melatonin both on the developing electrical activity of hypothalamic arcuate nucleus (NA) and morphology of testis and NA neurocytes during maturation in birds (Coturnix coturnix japonica) were tested. Slow [symbol: see text]-frequency was shown to prevail at quail NA electrical activity. NA spectral power gradually enlarges during maturation. The data confirm the evidence that catecholamines induce acceleration of sexual maturation in birds mainly via brain alpha-adrenoreceptors, while dopamine- and serotoninergic brain systems cause deceleration of maturation. Morning or evening treatments with melatonin (5 mkg/100 g bw) and evening ones (50 mkg/100 g bw) were revealed to result in activation of hypothalamic-testicular axis, and high-dose morning melatonin injections don't have any influence. Significant correlation was registered between the spectral power of NA neurocytes and profile area of their cellular nuclei. Total EA was demonstrated to vary at [symbol: see text]1- and, lesser, [symbol: see text]2-, [symbol: see text]-, and 6-ranges of spectrum, and was insignificant at B-range.
Dzerzhins'kyĭ
M E
ME
Taras Shevchenko National University, Kiev.
Vareniuk
I M
IM
D000818:Animals; D001111:Arcuate Nucleus of Hypothalamus / Q000166:cytology / Q000187:drug effects; D015306:Biogenic Monoamines / Q000494:pharmacology*; D003370:Coturnix; D004594:Electrophysiology; D012739:Gonadal Steroid Hormones / Q000494:pharmacology*; D007033:Hypothalamus, Middle / Q000187:drug effects* / Q000502:physiology; D008297:Male; D008550:Melatonin / Q000494:pharmacology; D013737:Testis / Q000187:drug effects* / Q000502:physiology; D013739:Testosterone / Q000494:pharmacology*
D015306:Biogenic Monoamines; D012739:Gonadal Steroid Hormones; D013739:Testosterone; D008550:Melatonin