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    Eur J Immunol. 1991 Nov;21(11):2871-5.

    Signaling by vascular cell adhesion molecule-1 (VCAM-1) through VLA-4 promotes CD3-dependent T cell proliferation.

    Source

    Biogen, Inc., Cambridge, MA 02142.

    Abstract

    Vascular cell adhesion molecule, VCAM-1, is an adhesion molecule expressed on activated endothelium thought to play a role in leukocyte migration to sites of inflammation. VCAM-1 adheres to leukocytes through the VLA-4 integrin. Recombinant soluble VCAM-1 (rsVCAM) and anti-CD3 mAb OKT3 were utilized to address the role of the VCAM-1/VLA-4 pathway in antigen-dependent T cell activation. Monocyte-depleted T cells proliferated upon exposure to co-immobilized OKT3 and rsVCAM but to neither alone. In contrast, an anti-VLA-4 mAb HP1/2 failed to co-activate with OKT3, despite the fact that both rsVCAM and HP1/2 support T cell adhesion comparably. These data indicate that adhesive function is not sufficient for co-stimulatory activity. They also reveal that VCAM-1 may play a role in regulating T cell immune responses as well as migration in vivo.

    PMID:
    1718763
    [PubMed - indexed for MEDLINE]

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