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Medial prefrontal transection enhances social interaction. I: behavioral studies
L E Gonzalez1, M Rujano, S Tucci
1Laboratory of Behavioral Physiology, Department of Physiology, School of Medicine, Los Andes University, Merida, Venezuela. gorey@ing.ula.ve
Abstract:
Behavioral effects of a medial prefrontal cortex (MPFC) transection were assessed in animal tests of anxiety. Social investigation and plus-maze open arm exploration increased in MPFC damaged animals relative to sham ones. MPFC lesions prevented D-amphetamine (2 mg/kg, i.p.) induced social investigation decrease and exaggerated general locomotion increase. Diazepam (1 mg/kg, i.p.) and MPFC synergistically increased open arm exploration on a second (repeated) plus-maze trial. These results suggest that the MPFC would be implicated in a generalized mechanism of warning enabling emission of appropriate responses to anxiogenic stimuli. Although, this lesion did not modify motor activity itself, the pattern of the motor activation induced by amphetamine was altered. The role of the MPFC areas in the behavioral response associated with fear is discussed.
Insights
The medial prefrontal cortex (MPFC) plays a key role in anxiety responses. MPFC lesions altered behavioral reactions to anxiety-inducing stimuli and drugs like amphetamine and diazepam.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Animal Models
Background:
- The medial prefrontal cortex (MPFC) is involved in regulating emotional and behavioral responses.
- Understanding the MPFC's role in anxiety is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the behavioral effects of medial prefrontal cortex (MPFC) transection in animal models of anxiety.
- To determine how MPFC lesions influence responses to anxiogenic stimuli and psychotropic drugs.
Main Methods:
- Assessment of anxiety-related behaviors in MPFC-lesioned and sham-lesioned animals.
- Administration of D-amphetamine and diazepam to evaluate drug-induced behavioral changes.
- Utilized social investigation tests and elevated plus-maze paradigms.
Main Results:
- MPFC lesions increased social investigation and elevated plus-maze open arm exploration.
- Lesions prevented amphetamine-induced decreases in social investigation and exaggerated locomotion increases.
- Diazepam and MPFC lesions synergistically enhanced open arm exploration in repeated trials.
Conclusions:
- The MPFC is implicated in a generalized warning mechanism for responding to anxiogenic stimuli.
- MPFC lesions alter behavioral responses to amphetamine, affecting motor activity patterns.
- The MPFC plays a significant role in fear-related behavioral responses.