Puerarin Alleviates Vascular Cognitive Impairment in Vascular Dementia Rats

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• Cerebral ischemia causes vascular dementia (VD), leading to cognitive deficits and brain vascular injury.
• Puerarin (Pur), a key compound from Radix Puerariae, shows known neuroprotective and cardiovascular benefits.

Purpose of the Study:

• To evaluate Puerarin's efficacy in ameliorating cognitive impairment and vascular damage in a rat model of VD.
• To investigate the underlying mechanisms, focusing on the role of the TRPM2 channel in Pur's therapeutic effects.

Main Methods:

• Vascular dementia was induced in rats via permanent occlusion of bilateral common carotid arteries (BCCAO).
• Rats were treated with varying doses of Puerarin (50, 100, 150 mg/kg).
• Cognitive function, synaptic plasticity, oxidative stress markers, and the TRPM2/NMDAR pathway were assessed.

Main Results:

• Puerarin dose-dependently reduced VD-induced pathological changes and cognitive deficits in BCCAO rats.
• Pur treatment increased synaptic structural plasticity and decreased oxidative stress (ROS, MDA) while boosting antioxidant capacity (SOD).
• Pur's benefits were associated with modulation of the ROS-dependent TRPM2/NMDAR pathway, affecting apoptosis-related proteins (Bax, Bcl2) and NMDA receptor subunits (NR2A).

Conclusions:

• Puerarin demonstrates significant therapeutic potential for vascular dementia.
• Pur alleviates neuronal apoptosis and vascular injury, likely through regulating the ROS-dependent TRPM2/NMDAR signaling pathway.
• These findings suggest Pur as a promising agent for treating VD and related cognitive impairments.