T lymphocytes compartmentalized on the epithelial surface of the lower respiratory tract express the very late activation antigen complex VLA-1

Cesare Saltini, Martin E. Hemler, Ronald G. Crystal

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T lymphocytes on the epithelial surface of the lower respiratory tract are thought to represent a relatively compartmentalized population of T cells that exchanges slowly with the blood. Since the lung is chronically burdened with antigens, "resident" T cells likely have a history of past activation. To evaluate this concept, we analyzed resident lung T cells for VLA-1 expression, which is indicative of a history of past stimulation. Lung lavage and blood T cells were evaluated in 13 normal nonsmokers using the monoclonal antibodies Leu4 (pan T cells), Leu3 (helper/inducer T cells), Leu2 (supressor/cytotoxic T cells), TS2 7 (α1 subunit of VLA-1), and A-1A5 (β subunit of VLA-1) using immunoflourescence and immunoprecipitation. In contrast to normal blood T cells which did not express VLA-1, lung T cells expressed the 210-kDa α1 and 130-kDa β subunits of the VLA-1 complex, the same as blood T cells activated in culture for 3 weeks. Two-color immunofluorescence with Leu4 and TS2 7 showed that 19 ± 6% of the lung T cells were VLA-1+, suggesting that a significant proportion of T lymphocytes on the alveolar epithelial surface are in a separate compartment from the VLA-1 blood cells. In sarcoidosis, a disease characterized by exaggerated numbers of active Leu3+ T cells in the lower respiratory tract, increased numbers of lung Leu3+ T cells expressing VLA-1 were present on the epithelial surface of the lung (P < 0.05 compared to normals). These observations are consistent with compartmentalized, chronically stimulated T lymphocytes on the alveolar epithelial surface that exchange with the systemic immune system very slowly.

Original languageEnglish
Pages (from-to)221-233
Number of pages13
JournalClinical Immunology and Immunopathology
Issue number2
Publication statusPublished - Feb 1988


ASJC Scopus subject areas

  • Immunology and Allergy
  • Pathology and Forensic Medicine
  • Immunology

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