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Influence of monoamines and testosterone on thehypothalamo-testicular axis of japanese quail (electrophysiological and morphometric study)
M.E. Dzerzhinsky, A.N. Ptitsa, I.M. Varenyuk
Taras Shevchenko National University, Kiеv
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Abstract
Effects of biogenic amines, testosterone and melatonin
both on the developing electrical activity of hypo-
thalamic arcuate nucleus (NA) and morphology of
testis and NA neurocytes during maturation in birds
(Coturnix coturnix japonica) were tested. Slow д-
frequency was shown to prevail at quail NA electrical
activity. NA spectral power gradually enlarges during
maturation. The data confirm the evidence that cate-
cholamines 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 treat-
4 № ,74 .Т ,1002 ,.нруж .лоізіФ 9848-1020 NSSI57
ments with melatonin (5mkg/100g bw) and evening
ones (50mkg/100g 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 bet-
ween the spectral power of NA neurocytes and profile
area of their cellular nuclei. Total EA was demon-
strated to vary at д1- and, lesser, д2-, и-, and б-ranges
of spectrum, and was insignificant at в-range.
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