Related Experiment Videos
Computerized rotometer apparatus for recording circling behavior.
E Etemadzadeh1, L Koskinen, S Kaakkola
1Orion Pharmaceutica, Research Center, Espoo, University of Helsinki, Finland.
Summary
This study presents an automated rotometer system for precisely measuring rat behavior. This innovation accelerates the screening of potential anti-Parkinsonian drugs by efficiently analyzing data from lesioned rats.
Area of Science:
- Neuroscience
- Pharmacology
- Biomedical Engineering
Background:
- Rotational behavior in rodents is a validated model for studying dopaminergic system function and Parkinson's disease.
- Unilateral lesions of the nigrostriatal dopamine pathway in rats induce characteristic ipsilateral or contralateral rotational responses to dopaminergic agents.
- Accurate and efficient measurement of this rotational behavior is crucial for preclinical drug screening.
Purpose of the Study:
- To describe a computerized rotometer system for on-line recording and analysis of rotational behavior in rats.
- To validate the system using known dopaminergic drugs (apomorphine, amphetamine) in a 6-hydroxydopamine (6-OHDA) lesioned rat model.
- To assess the system's utility in evaluating the effects of a catechol-O-methyltransferase (COMT) inhibitor on L-dopa-induced rotation.
Main Methods:
- Development of a computerized rotometer utilizing infrared photocell detection for rotational tracking.
- Integration with a microcomputer for on-line data acquisition and subsequent processing on a VAX computer using SAS software.
- Administration of apomorphine, amphetamine, and L-dopa (with and without OR-611) to rats with unilateral 6-OHDA-induced nigrostriatal lesions.
Main Results:
- The system accurately recorded drug-induced contralateral and ipsilateral rotations in 6-OHDA lesioned rats.
- Demonstrated potentiation of L-dopa-induced contralateral rotation by the COMT inhibitor OR-611.
- The automated system provided rapid statistical and graphical analysis of behavioral data.
Conclusions:
- The automated rotometer system offers a reliable and efficient method for quantifying rotational behavior in preclinical models of Parkinson's disease.
- This technology facilitates high-throughput screening of novel antiparkinsonian drug candidates.
- The system's speed and accuracy enhance the evaluation of drug efficacy and mechanisms of action in rodent models.