The Contribution of the External Globus Pallidus to Basal Ganglia Circuit Oscillatory Activity in an Experimental Model of Parkinson’s Diseaseстатья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:Aberrant synchronous β oscillations in motor neural networks in dopamine (DA) deficiency are associated with motor impairments in Parkinson’s disease (PD). The sources and mechanisms of their development are unclear. The aim of the present work was to determine the role of the external part of the globus pallidus (GPe) and the central component of the basal ganglia (BG) in generating and transmitting β oscillations in motor neural networks in a model of PD in rats. Analysis of local field potentials (LFP) in traces from the motor area of the cerebral cortex (MCx) and BG nuclei revealed the greatest β-oscillation (30–36 Hz) power and coherence levels in the MCx and reticular part of the substantia nigra (SNr) of hemispheres with DA deficit, while their levels in the dorsal segment of the lateral striatum (dStr) and GPe and coherence with the MCx and Snr were significantly lower. Apart from β oscillations, increases in the coherence of γ oscillations in the range 50–56 Hz were observed exclusively in the dStr and GPe in DA deficiency and their transient appearance in control rats coincided with the onset of difficulties with walking. Stimulation of DA receptors with levodopa decreased synchronization in the neural networks of hemispheres with DA deficiency and restored normal locomotion. Differences between the two types of activity (β and γ oscillations) in traces from the GPe in DA deficiency provide evidence of the complexity of the organization of motor neural networks which in normal conditions control different aspects of locomotion.