Phlorotannin Supplement Improves Scopolamine-Induced Memory Dysfunction by Rescuing Synaptic Damage in Mice.

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• Scopolamine (SCO) is widely used to induce memory deficits in animal models, mimicking aspects of dementia.
• Synaptic dysfunction and impaired signaling pathways are key contributors to memory impairment.

Purpose of the Study:

• To investigate the efficacy of a phlorotannin supplement (PS) in ameliorating SCO-induced memory deficits in mice.
• To elucidate the effects of PS on synaptic function and underlying molecular mechanisms, including the BDNF-ERK-CREB pathway.

Main Methods:

• Male C57BL/6N mice were treated with vehicle, donepezil, or varying doses of PS for 6 weeks.
• Behavioral tests, Golgi staining, immunofluorescence, and immunoblotting were employed to assess memory, synaptic integrity, and molecular signaling.

Main Results:

• PS administration significantly improved memory impairment induced by SCO.
• PS treatment restored the expression of key synaptic proteins, including synaptophysin, synapsin1, and PSD-95, in the hippocampus.
• PS enhanced brain-derived neurotrophic factor (BDNF) signaling and activated the ERK-CREB pathway.

Conclusions:

• Phlorotannin supplement (PS) mitigates scopolamine-induced memory dysfunction by protecting synaptic integrity.
• PS activates the BDNF-ERK-CREB signaling pathway, crucial for synaptic plasticity and memory formation.
• PS shows potential as a natural therapeutic agent for memory deficits.