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T-lymphocyte entry into the central nervous system.

W F Hickey1, B L Hsu, H Kimura

  • 1Department of Pathology, Washington University School of Medicine, Saint Louis, Missouri 63110.

Journal of Neuroscience Research
|February 1, 1991
PubMed
Summary
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T-lymphoblasts, but not other T cells, can enter the central nervous system (CNS). This entry is crucial for immune-mediated diseases and depends on lymphocyte activation, not antigen specificity.

Area of Science:

  • Neuroimmunology
  • Cellular Immunology
  • Pathogenesis of Immune-Mediated Diseases

Background:

  • T-lymphocyte entry into the central nervous system (CNS) is a key early event in immune-mediated diseases.
  • The precise mechanisms governing T-cell infiltration into the CNS remain unclear.

Purpose of the Study:

  • To investigate the physiological mechanisms controlling T-lymphocyte entry into the rat CNS.
  • To determine factors influencing T-cell extravasation into the CNS parenchyma.

Main Methods:

  • Introduction of T-lymphoblasts and non-activated T cells into the circulation of rats.
  • Quantification of lymphocyte concentration in CNS tissue over time.
  • Observation of lymphocyte exit from CNS tissue.

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Main Results:

  • T-lymphoblasts readily enter the CNS, while non-activated T cells are excluded.
  • CNS entry is dependent on lymphocyte activation state, not antigen specificity or MHC compatibility.
  • Peak T-lymphoblast concentration in CNS occurs between 9-12 hours post-introduction.
  • Infiltrated lymphocytes exit the CNS within 1-2 days.
  • Antigen-specific T cells may remain in the CNS or re-enter to initiate inflammation.

Conclusions:

  • Lymphocyte activation state is the primary determinant of T-cell entry into the CNS.
  • This mechanism of entry appears to be a general principle for activated T cells entering various tissues.
  • Understanding T-cell entry mechanisms is vital for developing therapies for CNS immune-mediated diseases.