Микроэлектрофизиологическое изучение соотношения возбудительных и тормозных синаптических процессов в кортиконигральной проекции к SNс на модели болезни Паркинсона

Abstract

In series experiments on 9 Albino rats (250 g) the comparative analyses of single neuron’s impulse activity of Substantia nigra compacta – SNc at high frequency stimulation (HFS) of the brain primary motor cortex (M1) in norm (107 neurons, n=4) and on the model of Parkison’s disease (PD) (105 neurons, n=5) has been conducted. Analyses of relative degree of depressor and excitatory effects frequency intensity on the base of spikes average frequency diagrams, represented as a disc diagram (in %) resulted in the following conclusions. In SNc neurons on the model of PD the poststimulus manifestations of depressor activity completely absent, but tetanic potentiation in both sequences 1,65- and 2,02-multiple exceeded of those in the norm. The comparative analyses of pre- and poststimulus frequency activity of SNc neurons on the model of PD, led to the conclusion that it is considerably higher in comparison with the norm. It has been revealed vulnerability of depressor poststimulus effects of SNc neurons, even their full absence, that in its turn, testifies about more involvement of SNc in PD.