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Protective autoimmunity is a physiological response to CNS trauma.
1Department of Neurobiology and Immunology, The Weizmann Institute of Science, 76100 Rehovot, Israel.
Summary
Central nervous system (CNS) trauma triggers a beneficial T cell-dependent immune response that reduces neuronal loss. This neuroprotective response aids in the recovery of spared neurons after CNS injury.
Area of Science:
- Neuroscience
- Immunology
- Neurotrauma
Background:
- Secondary degeneration of neurons after central nervous system (CNS) injury is a significant cause of permanent neurological deficits.
- Previous studies indicated that immunization with CNS myelin-associated self-antigens could mitigate this secondary neuronal loss.
Purpose of the Study:
- To investigate whether CNS trauma itself initiates an endogenous immune response that confers neuroprotection.
- To determine if this response is T cell-dependent and specific to CNS antigens.
Main Methods:
- Rodent models of CNS injury (optic nerve crush, spinal cord contusion) were employed.
- Experiments involved assessing neuronal survival and functional recovery after pre-conditioning injuries or adoptive transfer of immune cells.
- T cell-deficient rodents and transgenic mice with specific T cell receptor (TcR) repertoires were utilized.
Main Results:
- Preceding spinal cord injury enhanced retinal ganglion cell survival after subsequent optic nerve injury.
- Transfer of myelin basic protein (MBP)-activated splenocytes from injured donors improved locomotor function in recipient rats with spinal cord injury.
- Neuronal survival was reduced in T cell-deficient rats and in mice with TcRs specific for non-self antigens compared to controls.
Conclusions:
- Central nervous system (CNS) trauma spontaneously elicits a beneficial, T cell-dependent immune response.
- This endogenous neuroprotective mechanism, potentially involving myelin-specific T cells, reduces secondary neuronal loss after CNS injury.