Salud Mental

Effect of postictal process in motor deficit and monoaminergic concentration in hippocampus, cerebellum, and cortex

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Alberto Avila-Luna
Antonio Bueno-Nava
José Luis Cortes-Altamirano
Samuel Reyes-Long
Cindy Bandala
Alfonso Alfaro-Rodríguez

Abstract

Introduction. Systemic administration of pentylenetetrazole (PTZ) causes brain damage (BD), and triggers a series of morphological and neurochemical changes, which in turn bring about behavioral, cognitive, and motor deficits. Serotonin (5-HT), dopamine (DA), and noradrenaline (NA) levels are controlled by various brain structures and these levels are related to motor activity; however, the concentration of these neurotransmitters during the postictal process remains unknown.

Objective. We investigated the concentration of 5-HT, NA and DA in the hippocampus, cerebellum, and cortex on motor deficit during the postictal stage.

Method. Eighteen male Wistar rats (300 g) assigned to two groups: control (n = 9, saline solution) and experimental (n = 9, PTZ) were used. Myoclonic shakes were counted and motor behavior assessments were recorded during three hours post PTZ injection (90 mg/kg). The cortex, cerebellum, and hippocampus of each rat were dissected to determine the 5-HT, DA, and NA concentration by high performance liquid chromatography.

Results. PTZ induced a significant increase in total 5-HT and DA levels in the hippocampus and cortex; in the cerebellum there was a significant increase in the concentration of 5-HT and NA. The presence of myoclonic shakes as well as a marked motor deficit in the experimental group were significantly different in comparison to the control.

Discussion and conclusion. 5-HT modifies the concentration of other monoamines directly involved in motor aspects such as NA and DA in the hippocampus, cerebellum, and cortex during the postictal process.
Keywords:
Pentylenetetrazole, serotonin, monoamines, postictal, motor deficit, rat

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