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Cytokine circuits in brain. Implications for AIDS dementia complex
1Department of Cell Biology, University of Alabama, Birmingham 35294.
Research Publications - Association for Research in Nervous and Mental Disease
|January 1, 1994
Summary
Immune and glial cells in the central nervous system (CNS) use shared cytokines for communication. Their interactions, influenced by factors like blood-brain barrier damage, determine whether CNS inflammation is propagated or suppressed, impacting conditions like HIV-1 expression.
Area of Science:
- Neuroimmunology
- Cellular Communication in the CNS
Background:
- Immune cells and central nervous system (CNS) glial cells utilize common cytokines for signaling.
- Activated astrocytes and microglia are primary cytokine sources in the CNS, with oligodendrocytes also expressing certain cytokines.
Purpose of the Study:
- To summarize studies on cytokine-mediated communication between immune and glial cells in the CNS.
- To explore the complex circuitry of cytokine interactions during CNS inflammation and blood-brain barrier damage.
Main Methods:
- Review and synthesis of existing research on cytokine signaling in the CNS.
- Analysis of the roles of astrocytes, microglia, and infiltrating immune cells in cytokine production.
- Examination of factors influencing the propagation or suppression of CNS immune responses.
Main Results:
- Cytokine production by activated glial cells and infiltrating macrophages can propagate neuroinflammation.
- Pro-inflammatory cytokines (e.g., IL-1, TNF-alpha, IL-6) from glial cells can enhance HIV-1 expression in the CNS.
- Immunosuppressive cytokines (e.g., TGF-beta) can potentially suppress ongoing cytokine cascades.
Conclusions:
- The balance between immune-enhancing and immunosuppressive cytokines, along with cellular activation states and cytokine concentrations, dictates the outcome of CNS immune responses.
- Interplay of various parameters, including cytokine levels and cellular exposure timing, determines the overall impact on CNS immunity and HIV expression.