[Circadian rhythm of total histone concentration in noradrenalinergic and serotoninergic neurons and their glial satellite cells].

By means of photoelectric aperture cytospectrophotometry of fast green FCF strain sections the total histone content was determined in the nuclei and whole bodies of the neurons of the reticular formation, as well as in the nuclei of their glial satellite cells during various periods of the 24-hour cycle. In the noradrenalinergic neurons of the reticular formation of the lateral nucleus ther was revealed a circadian rhythm of the changes in the total histone content with the two maxima and the two minima per 24 hours in the neuronal bodies, but with only one period of fluctuations per 24 hours in their nuclei. On the contrary, in the 5-hydroxytryptaminergic (serotoninergic) neurons of the paragiant-cell nucleus of the reticular formation the total histone content changes once in 24 hours in the cell bodies, but twice within the same period in the neuronal nuclei. The amplitude of fluctuations was markedly lower than in the corresponding neurons in the cells of the perineuronal neuroganglia,