The Journal of Immunology, Vol 140, Issue 9 2989-2993, Copyright © 1988 by American Association of Immunologists

ARTICLES

Lymphocyte recruitment in delayed-type hypersensitivity. The role of IFN-gamma

TB Issekutz, JM Stoltz and P v.d. Meide
Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada.

Lymphocytes are recruited out of the blood into delayed-type hypersensitivity (DTH) reactions, but the factors controlling their migration are poorly understood. Our previous studies have shown that IFN-alpha/beta, its inducers, and T cell lymphokines can induce lymphocyte migration into the skin after intradermal injection. The present studies were designed to determine the effect of rIFN-gamma, IL- 1, and anti-IFN-gamma on lymphocyte recruitment into DTH. Small peritoneal exudate lymphocytes, which preferentially migrate to inflammatory sites, were labelled with 111In and injected i.v. into rats. The intradermal injection of IFN-gamma stimulated the migration of these lymphocytes into the skin. IL-1 induced very little migration by itself, but enhanced the effect of IFN-gamma. Kinetic analysis demonstrated that the migration of lymphocytes to IFN-gamma was rapid, with a peak at 6 h, whereas migration into a DTH reaction was minimal for the first 8 h and reached a peak 24 h after intradermal injection. Polyclonal rabbit anti-IFN-gamma anti-serum, and a Mab to IFN-gamma, DB- 2, could almost completely block lymphocyte migration induced by IFN- gamma. Furthermore, DB-2 inhibited lymphocyte recruitment into DTH reactions by 50 to 90%. This Mab did not affect migration in response to IFN-alpha/beta, although it partially inhibited the response to polyI:C. The effect of IFN-gamma on lymphocyte recruitment was not specific for small peritoneal exudate lymphocytes, because both spleen T cells and lymph node cells migrated in response to IFN-gamma and DB-2 inhibited the recruitment of splenic T cells to DTH. Thus, IFN-gamma is a potent stimulator of lymphocyte migration into the skin and a major mediator of lymphocyte recruitment into DTH.

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