Adopted cognitive tests for gerbils: validation by studying ageing and ischemia

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Gerontology

Background:

• Transient forebrain ischemia models are crucial for studying neuroprotection and cognitive consequences.
• Existing behavioral tests in gerbils may not fully capture attention and learning deficits post-ischemia.

Purpose of the Study:

• To validate novel object recognition and hole-board learning tests for assessing cognitive function in gerbils.
• To investigate the effects of aging and transient forebrain ischemia on gerbil cognitive performance.

Main Methods:

• Gerbils of different ages (4, 9, 18 months) were subjected to transient forebrain ischemia via bilateral carotid occlusion.
• Cognitive functions were assessed using novel object recognition and hole-board learning tests.
• Neuronal cell death in the hippocampus was quantified using TUNEL and caspase-3 staining.

Main Results:

• Aging did not significantly impact attention and memory in gerbils within the tested range.
• Transient ischemia induced selective neuronal damage in the hippocampus (CA1, CA2 regions).
• Ischemic gerbils exhibited hyperactivity, reduced attention, and impaired spatial memory compared to controls.

Conclusions:

• Novel object recognition and hole-board learning tests are reliable for assessing ischemia-induced cognitive impairment in gerbils.
• These validated tests can be incorporated into standard behavioral batteries for gerbil research.
• The proposed methods offer valuable tools for evaluating neuroprotective strategies against ischemic brain injury.