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Circuit-Specific Plasticity of Callosal Inputs Underlies Cortical Takeover
Emily Petrus1, Sarah Dembling2, Ted Usdin3
1Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892 emily.petrus@nih.gov.
Summary
Neural circuits reorganize after sensory loss, impacting brain function. Specificity in this reorganization influences beneficial adaptations or maladaptive pain, enhancing intact sensory processing.
Area of Science:
- Neuroscience
- Neuroplasticity
- Somatosensory System
Background:
- Sensory loss from injury or amputation triggers widespread neural reorganization, including interhemispheric cortical interactions.
- This reorganization can lead to enhanced sensory function in intact areas or maladaptive outcomes like phantom limb pain.
- Understanding the specific circuitry alterations is crucial for differentiating beneficial from detrimental neural adaptations.
Purpose of the Study:
- To investigate the specific circuitry alterations underlying interhemispheric cortical reorganization after unilateral sensory deprivation.
- To determine if the projection targets of neurons in the deprived somatosensory cortex dictate the nature of plasticity.
- To elucidate the mechanisms contributing to both enhanced sensory processing and maladaptive pain phenotypes.
Main Methods:
- Utilized a mouse model of unilateral whisker denervation to study somatosensory cortex (S1BC) plasticity.
- Examined synaptic strength, excitability, and inhibitory input onto deep S1BC neurons projecting to various cortical areas.
- Stimulated the corpus callosum (CC) to assess interhemispheric connectivity changes.
Main Results:
- Neurons projecting from deprived S1BC to intact S1BC showed hyperexcitability and reduced inhibition upon CC stimulation.
- M1-projecting neurons exhibited increased excitability and CC input, balanced by enhanced inhibition.
- S2- and ACC-projecting neurons displayed no significant changes in excitability or CC input, indicating target-specific plasticity.
Conclusions:
- Subgroups of output neurons undergo specific plasticity following peripheral injury, with distinct changes based on projection targets.
- Plasticity in S1BC-projecting neurons likely underlies enhanced reciprocal S1BC connectivity, supporting intact sensory processing.
- These findings demonstrate specific circuit alterations that may explain enhanced sensory function and provide insights into maladaptive pain.
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