Shedding light on left hippocampal mGlu5 in Alzheimer's disease.

Selective inhibition of left hippocampal mGlu5 restores memory and normalizes signaling in AD mice, revealing lateralized hippocampal dysfunction.

• Why it matters: Understanding hemispheric differences in hippocampal signaling is crucial because lateralized disruptions may underlie specific cognitive deficits in Alzheimer's disease, yet this remains unclear.
• What they did: The study examined mGlu5 expression in wild-type and AD mouse models, used light-controllable Alloswitch-1 to inhibit mGlu5 selectively in the left hippocampus, and assessed effects on memory and signaling pathways.
• The result: Inhibition of left hippocampal mGlu5 improved working and short-term memory, normalized downstream signaling including Pyk2, GSK-3β, and tau phosphorylation, and demonstrated the therapeutic potential of region-specific photopharmacology in AD.