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[Neuromotor dyskinesia occurring during repeated injections of enkephalins into the rat striatum]
Abstract:
The effect of 3-week daily injection of 5 or 15 mg enkephalin-like tetrapeptides (TP) into the rostral neostriatum was studied in chronic experiments on rats with implanted microcannulas. According to the type of TP, hyperkinesia or a pathological cataleptic status was registered in disorder of conditioned reflex behavior of rats. Myoclonus of the muscles of the face and the muscles of the front limbs was encountered from the 10th till the 120th minute after the injection and was characterized by dynamic changes during chronic administration of the agent and clearly defined stage of generalization. A pathologic cataleptic status (rigidity) in an animal kept in a suspended position occurred 120-140 minutes after the microinjection and lasted for up to 100 sec. The effect of the agent depended on the dose and stage of its chronic injection. The results of the study allow the conclusion on the principal possibility of the striatal enkephalinergic system being involved in the genesis of neuromotor dyskinesia and dysfunction of the basal ganglia, which is manifested by disorders of conditioned reflex behavior and motor extrapyramidal deviations.
Insights
Enkephalin-like tetrapeptides (TP) administered to rats induced hyperkinesia or cataleptic status, affecting conditioned reflexes. These findings suggest the striatal enkephalinergic system
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Context:
- The basal ganglia play a crucial role in motor control and behavior.
- Enkephalinergic systems are implicated in various neurological functions.
- Disorders of the basal ganglia can lead to significant motor and behavioral deficits.
Purpose:
- To investigate the effects of enkephalin-like tetrapeptides (TP) on motor behavior and conditioned reflexes in rats.
- To explore the role of the striatal enkephalinergic system in neuromotor functions.
Summary:
- Daily injections of enkephalin-like tetrapeptides (TP) into the rat neostriatum over 3 weeks caused dose-dependent motor abnormalities, including hyperkinesia and pathological cataleptic status.
- These effects were observed as disorders in conditioned reflex behavior, myoclonus, and rigidity, with dynamic changes during chronic administration.
- The study demonstrated that TP administration led to extrapyramidal motor deviations and altered conditioned behavior.
Impact:
- Provides evidence for the involvement of the striatal enkephalinergic system in the development of neuromotor dyskinesia.
- Suggests a potential link between enkephalinergic pathways and basal ganglia dysfunction.
- Offers insights into the neurobiological mechanisms underlying motor control and behavioral disorders.