Neurobehavioral deficits in db/db diabetic mice

Area of Science:

• Neuroscience
• Endocrinology
• Behavioral Science

Background:

• Clinical studies suggest neurobehavioral disturbances in type-2 diabetes.
• Preclinical research validating these observations is limited.
• The db/db mouse is a recognized model for type-2 diabetes complications.

Purpose of the Study:

• To comprehensively investigate the db/db mouse as a preclinical model for type-2 diabetes-related neurobehavioral complications.
• To assess depression, psychosis-like symptoms, anxiety, locomotor activity, and working memory in db/db mice.

Main Methods:

• Behavioral testing of juvenile and adult db/db mice.
• Forced Swim Test (FST) for depression.
• Pre-Pulse Inhibition (PPI) test for psychosis-like symptoms.
• Elevated Plus Maze (EPM) for anxiety.
• Open Field Test (OFT) for locomotor activity and thigmotaxis.
• Y-maze test for working memory.

Main Results:

• Both juvenile and adult db/db mice showed increased immobility in FST, indicating behavioral despair.
• Adult db/db mice exhibited age-dependent psychosis-like symptoms with disrupted PPI.
• Db/db mice displayed anxiolytic behavior in the EPM test.
• Hypo-locomotion was observed in db/db mice in the OFT.
• No working memory impairment was detected in the Y-maze test.

Conclusions:

• This study provides the first report of depression, psychosis-like symptoms, and anxiolytic behavior in the db/db mouse strain.
• The db/db mouse demonstrates potential as a valuable preclinical model for investigating type-2 diabetes-associated neurobehavioral complications.
• Findings highlight the need for further research into the neurobiological mechanisms underlying these behavioral changes in type-2 diabetes.