Lithium rescues synaptic plasticity and memory in Down syndrome mice

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• Down syndrome (DS) is associated with impaired hippocampal memory.
• Adult hippocampal neurogenesis is crucial for memory and impaired in DS.
• The therapeutic potential of enhancing neurogenesis in DS remains unclear.

Purpose of the Study:

• To investigate if increasing adult neurogenesis can improve hippocampal plasticity and memory in a mouse model of DS.
• To explore the efficacy of lithium in restoring neurogenesis and cognitive function in DS.

Main Methods:

• Utilized the Ts65Dn mouse model of Down syndrome.
• Administered chronic lithium to activate the Wnt/β-catenin pathway and promote neurogenesis.
• Assessed hippocampal synaptic plasticity and behavioral performance in memory tasks.

Main Results:

• Lithium treatment restored adult hippocampal neurogenesis in DS mice to physiological levels.
• Neurogenesis restoration normalized newborn neuron synaptic plasticity in the dentate gyrus.
• Behavioral deficits in fear conditioning and recognition memory were fully rescued.

Conclusions:

• Restoring adult hippocampal neurogenesis in DS mice rescues synaptic plasticity and memory deficits.
• Adult neurogenesis is a promising therapeutic target for cognitive impairments in Down syndrome.