Treadmill Running Regulates Adult Neurogenesis, Spatial and Non-spatial Learning, Parvalbumin Neuron Activity by...

Area of Science:

• Neuroscience
• Cell Biology
• Molecular Psychiatry

Background:

• Exercise promotes adult neurogenesis and improves mental health via parvalbumin (PV)-positive GABAergic interneurons.
• ErbB4, a receptor for neuregulin 1, is primarily expressed in PV-positive interneurons.

Purpose of the Study:

• Investigate if ErbB4 in PV-positive neurons mediates exercise's beneficial effects on adult neurogenesis and mental disorders.
• Examine the impact of an ErbB4 inhibitor on memory and neurogenesis.

Main Methods:

• Conducted a four-week study using AG1478, an ErbB4 inhibitor.
• Assessed memory performance using T-maze, Morris water maze, and contextual fear conditioning.
• Measured total ErbB4 (T-ErbB4), phosphorylated ErbB4 (p-ErbB4), and intracellular calcium levels in PV neurons.

Main Results:

• AG1478 impaired memory tasks and downregulated T-ErbB4 and the p-ErbB4/T-ErbB4 ratio.
• ErbB4 inhibition was associated with neurogenesis impairment and decreased intracellular calcium in PV neurons.
• Exercise reversed the AG1478-induced decrease in intracellular calcium levels in PV neurons.

Conclusions:

• Exercise may regulate adult neurogenesis and PV neuron activity through ErbB4 signaling.
• Targeting ErbB4 shows promise for enhancing memory and cognitive functions in mental disorders.
• Findings underscore the importance of exercise for neurogenesis and cognitive health.