The Journal of Immunology, Vol 148, Issue 1 177-181, Copyright © 1992 by American Association of Immunologists

ARTICLES

Neutrophil stimulation and priming by direct contact with activated human T lymphocytes

JH Zhang, A Ferrante, AP Arrigo and JM Dayer
Department of Medicine, Hopital Cantonal Universitaire, Geneve, Switzerland.

The concept that T lymphocytes regulate neutrophil function has an important implication in the understanding of the role of these cells in immunity against infection and in inflammatory diseases, but evidence for this concept is primarily derived from the effects of lymphokines on neutrophils. We now present evidence to show that living or paraformaldehyde-fixed mitogen-activated T lymphocytes, as well as an activated T cell line (HUT-78), induce by cell-cell contact, an oxygen-dependent respiratory burst measured by both the lucigenin- dependent chemiluminescence assay and superoxide production. Neutrophils reacted with purified human T lymphocytes which had been activated by culture in the presence of PHA and PMA for 72 h showed a marked and significant respiratory burst compared with neutrophils treated with T lymphocytes cultured in the absence of these mitogens. Similar results were observed with the paraformaldehyde-fixed T cell line (HUT-78). The ability to stimulate neutrophils required intact paraformaldehyde-fixed T cells, and neutrophil stimulation failed to occur if the T cells and neutrophils were separated by membrane filters. mAb to TNF-alpha, and TNF-beta blocked the ability of rTNF- alpha and TNF-beta to stimulate neutrophils but did not block the neutrophil response induced by activated T cells. Pretreatment of neutrophils with the activated T lymphocytes enhanced the response to the tripeptide, FMLP. It is therefore conceivable that activated T lymphocytes attracted at sites of inflammation influence neutrophil activity by direct plasma membrane interaction which clearly represents an efficient microbial defence mechanism, minimizing tissue damage during inflammation.

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