Endothelial antigen presentation: stimulation of previously activated but not naïve TCR-transgenic mouse T cells.

Published

Journal Article

In vitro experiments have shown that endothelial cells can function as antigen-presenting cells to CD4(+) T lymphocytes. The studies presented here address the question of whether naïve versus previously activated CD4(+) helper T cells differ in their responses to endothelial antigen presentation. TCR-transgenic mice were used as a source of naive T cells of defined antigen specificity. These cells were stimulated in vitro with antigen and splenic antigen-presenting cells to generate populations of T lymphocytes with a previously activated/memory phenotype. Two different types of mouse endothelial cells were used as antigen-presenting cells, including the SVEC4-10 line derived from lymph node endothelium and primary murine pulmonary microvascular endothelium. Monolayer cultures of both types of endothelium were capable of antigen-dependent stimulation of previously activated TCR-transgenic CD4(+) cells. In contrast, neither endothelial type could activate naïve CD4(+) T cells. When costimulatory signals were provided in trans by the addition of MHC-mismatched mouse spleen cells, activation of naïve T cells by endothelial antigen presentation could be demonstrated. The expression of ICAM-1 or VCAM-1 on the endothelial cells was not sufficient to activate naïve T cells. Furthermore, the mouse lung endothelium constitutively expresses B7-1, and therefore, the inability of endothelium to stimulate naïve T cells could not be attributed to a lack of CD28-ligands. These studies suggest that the potential role of endothelial antigen presentation in immune responses is restricted to promoting responses by T cells which have previously encountered antigen presented by other antigen-presenting cells.

Full Text

Duke Authors

Cited Authors

  • Perez, VL; Henault, L; Lichtman, AH

Published Date

  • October 10, 1998

Published In

Volume / Issue

  • 189 / 1

Start / End Page

  • 31 - 40

PubMed ID

  • 9758692

Pubmed Central ID

  • 9758692

International Standard Serial Number (ISSN)

  • 0008-8749

Digital Object Identifier (DOI)

  • 10.1006/cimm.1998.1362

Language

  • eng

Conference Location

  • Netherlands