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Alterations in immune cell phenotype and function after experimental spinal cord injury
P G Popovich1, S Stuckman, I E Gienapp
1Department of Molecular Virology, Immunology & Medical Genetics, Ohio State University College of Medicine and Public Health, Columbus, 43210, USA. popovich.2@osu.edu
Journal of Neurotrauma
|September 22, 2001
Summary
Spinal cord injury alters immune cell balance and function, increasing CD4+ and decreasing CD8+ lymphocytes. This immune response is linked to hypothalamic-pituitary-adrenal axis activation and elevated corticosterone levels.
Area of Science:
- Neuroimmunology
- Traumatic Injury Research
Background:
- Spinal cord injury (SCI) triggers neuroinflammation and impacts systemic immunity.
- Peripheral immune responses, including lymphocyte function, may be altered post-SCI.
Purpose of the Study:
- To investigate the effects of spinal contusion injury on lymphocyte phenotype and function.
- To assess the correlation between immune changes and hypothalamic-pituitary-adrenal (HPA) axis activation.
Main Methods:
- Flow cytometry was used to analyze lymphocyte populations (CD4+, CD8+) from lymph nodes and spleen over time post-injury.
- Lymphocyte proliferation assays were performed using myelin basic protein (MBP) and a mitogen.
- Circulating corticosterone (CORT) levels were measured.
Main Results:
- SCI led to an increase in CD4+ and a decrease in CD8+ lymphocytes within the first week.
- Lymphocytes showed increased proliferation to MBP in lymph nodes by day 3.
- Lymphocyte proliferation to mitogen increased in both lymph nodes and spleen by week 1.
- Elevated CORT levels were observed within 24 hours and persisted for up to 1 month post-SCI.
Conclusions:
- Spinal cord injury induces significant changes in lymphocyte phenotype and function.
- These immune alterations are associated with HPA axis activation and elevated corticosterone levels.