Moringa oleifera Seed Extract Alleviates Scopolamine-Induced Learning and Memory Impairment in Mice

Area of Science:

• Neuropharmacology
• Neuroscience
• Natural Product Research

Background:

• Moringa oleifera seeds possess diverse pharmacological properties.
• Cognitive impairment is often linked to reduced cholinergic activity and neurogenesis.
• Scopolamine is a common agent used to induce amnesia in animal models.

Purpose of the Study:

• To investigate the neuropharmacological effects of Moringa oleifera seed extract (MSE) on scopolamine-induced cognitive impairment in mice.
• To elucidate the mechanisms underlying MSE's effects on memory, cholinergic system, and neurogenesis.

Main Methods:

• Administered 70% ethanolic MSE (250 or 500 mg/kg) orally to mice for 7 or 14 days.
• Induced cognitive impairment using intraperitoneal scopolamine injection (4 mg/kg).
• Assessed cognitive function using passive avoidance and Morris water maze (MWM) tests; analyzed hippocampal cholinergic reactivity, neurogenesis, and key protein expressions (p-Akt, p-ERK1/2, p-CREB).

Main Results:

• Scopolamine injection impaired learning, memory, cholinergic system reactivity, and hippocampal neurogenesis.
• MSE pretreatment significantly reversed scopolamine-induced cognitive deficits.
• MSE enhanced cholinergic neurotransmission and neurogenesis, reversing scopolamine-induced decreases in p-Akt, p-ERK1/2, and p-CREB protein expression in the hippocampus.

Conclusions:

• MSE exhibits potent neuropharmacological effects, ameliorating cognitive impairment in mice.
• The mechanism involves enhancing cholinergic neurotransmission and hippocampal neurogenesis.
• MSE's effects are mediated through the activation of Akt, ERK1/2, and CREB signaling pathways, suggesting its potential as a therapeutic agent for amnesia.