Increase in activin A may counteract decline in synaptic plasticity with age

Area of Science:

• Neuroscience
• Molecular Biology
• Aging Research

Background:

• Activin A, part of the TGF-β family, supports brain development and injury repair.
• In adult brains, Activin A improves cognitive performance by modulating synaptic signaling.
• Cerebrospinal fluid Activin A levels increase with age, suggesting a role in mitigating cognitive decline.

Purpose of the Study:

• To investigate the role of Activin A in synaptic plasticity within the aging brain.
• To determine if Activin A signaling can counteract age-related impairments in cognitive function.

Main Methods:

• Utilized a transgenic mouse model with forebrain-specific disruption of Activin A receptor signaling (dnActRIB).
• Assessed long-term potentiation (LTP), a measure of synaptic plasticity, in hippocampal slices from young and middle-aged mice.
• Administered recombinant Activin A to evaluate its effect on LTP in young dnActRIB mice.

Main Results:

• Young dnActRIB mice exhibited impaired NMDA receptor-dependent and -independent LTP compared to wild-type.
• This difference in LTP was absent in middle-aged dnActRIB mice, correlating with elevated Activin A and ActRIB levels.
• Recombinant Activin A restored normal LTP in young dnActRIB mice.

Conclusions:

• Endogenous Activin A receptor signaling strengthens in the middle-aged brain, potentially to prevent cognitive decline.
• These findings suggest a compensatory mechanism in aging that aims to preserve cognitive function.
• Targeting Activin A signaling may offer therapeutic avenues for cognitive preservation in the aged brain.