Mildronate enhances learning/memory and changes hippocampal protein expression in trained rats

Area of Science:

• Neuroscience
• Pharmacology

Background:

• Mildronate protects mitochondrial metabolism and exhibits neuroprotective effects in models of neurotoxicity and Parkinson's disease.
• Previous findings suggest mildronate may stimulate cell survival and alter neurogenic protein expression.

Purpose of the Study:

• To investigate the effects of mildronate on learning and memory in rats using passive avoidance response (PAR) and active conditioned avoidance response (CAR) tests.
• To assess the impact of mildronate on neural progenitor cell proliferation and hippocampal protein biomarker expression related to memory.

Main Methods:

• Rats were trained in CAR tests, with some receiving bromodeoxyuridine (BrdU) to label proliferating cells.
• Immunohistochemistry was used to evaluate hippocampal BrdU incorporation and the expression of biomarkers: GAD65/67, AChE, GAP-43, and c-jun/AP-1.
• Protein expression was compared between trained, mildronate-treated rats and non-trained controls.

Main Results:

• Mildronate significantly enhanced learning and memory formation in the CAR test.
• A notable increase in hippocampal neural progenitor cell proliferation was observed in mildronate-treated rats.
• Mildronate modulated the expression of biomarker proteins involved in glutamatergic and cholinergic pathways, transcription factors, and adhesion molecules.

Conclusions:

• Mildronate administration improves cognitive functions, specifically learning and memory.
• The cognitive enhancement is associated with increased neurogenesis and altered expression of key memory-related proteins.
• Mildronate shows promise as a potential cognitive enhancer for treating dementia associated with neurodegenerative diseases.