The Journal of Immunology, Vol 153, Issue 1 21-31, Copyright © 1994 by American Association of Immunologists

ARTICLES

Hyaluronate is costimulatory for human T cell effector functions and binds to CD44 on activated T cells

R Galandrini, E Galluzzo, N Albi, CE Grossi and A Velardi
Department of Clinical Medicine, Pathology, and Pharmacology, University of Perugia, Italy.

Lymphohematopoiesis, cell matrix adhesion, homing of leukocytes, T cell activation, and tumor metastasis are mediated through the CD44 family of cell surface receptors. We have recently shown that anti-CD44 mAb trigger protein tyrosine kinase-dependent activation of T cell effector functions. Here, we show that hyaluronate (HA), a CD44 ligand, in conjunction with CD3/TCR-mediated stimuli, is costimulatory for human peripheral blood T cell proliferation, for IL-2 production by Th clones, and for release of trypsin-like esterase by cytolytic T cell clones. A human T cell line, HUT-78, was found to bind HA and on HA coating it was used as a target for cytolytic T cell clones. After anti- CD3 stimulation, CD3+/CD8+ clones acquire the ability of lysing HA- coated HUT-78 cells more efficiently than the same HA-uncoated targets. Resting peripheral blood T cells and T cell clones do not adhere to HA- coated plates. However, 24-h anti-CD3 mAb stimulation gives them the transient ability to bind HA. HA adhesion of activated T cells and T cell clones, as well as that of T cell lines, is blocked by one anti- CD44 mAb (J-173). Two other anti-CD44 mAbs induce a 10-fold increase in HA adhesiveness of anti-CD3-stimulated peripheral blood T cells. This impressive HA adhesiveness is also readily blocked by J-173 anti-CD44 mAb. These data indicate that 1) HA is costimulatory for human T cell effector functions in conjunction with CD3/TCR-mediated stimuli, 2) the capacity to bind HA is acquired by resting T cells and T cell clones after anti-CD3 stimulation, and 3) HA binding occurs via specific interaction with CD44 molecules expressed on activated T cells.

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