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© The Rockefeller University Press, 0022-1007/1996/12/2341/ $5.00
The Journal of Experimental Medicine, Volume 184, Number 6, December 1, 1996 2341-2352

Articles

The Route of Antigen Entry Determines the Requirement for L-selectin during Immune Responses

Michelle D. Catalina*, Michael C. Carroll§, Helen Arizpe*, Akira Takashima{ddagger}, Pila Estess*, and Mark H. Siegelman*

From the * Laboratory of Molecular Pathology, Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas 75235-9072; {ddagger} Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, Texas 75235-9069; and § Harvard Medical School, Department of Pathology, Boston, Massachusetts 02115

L-selectin, an adhesion molecule constitutively expressed on leukocytes, is important for primary adhesion and extravasation of lymphocytes at specialized high endothelial venules within lymph nodes and other leukocytes at sites of inflammation. We have generated L-selectin–deficient mice by targeted disruption, and have confirmed a previously reported phenotype which includes strikingly impaired contact hypersensitivity (CHS) responses to reactive haptens (Tedder, T.F., D.A. Steeber, and P. Pizcueta. 1995. J. Exp. Med. 181:2259–2264; Xu, J.C., I.S. Grewal, G.P. Geba, and R.A. Flavell. 1996. 183:589–598.). Since the mechanism of this impairment has not been clarified, we sought to define the stage(s) at which the CHS response is affected in L-selectin–deficient mice. We show that epidermal Langerhans cells in L-selectin– deficient mice are normal in number, migrate to peripheral lymph nodes appropriately, and are functional in presenting allogeneic and haptenic antigens. Moreover, T cells, as well as neutrophil and monocyte effector populations, are fully capable of entry into the inflamed skin sites in the absence of L-selectin. Thus, antigen presentation and effector mechanisms are intact in L-selectin deficient mice. In contrast, virtually no antigen-specific T cells can be found within draining peripheral nodes after a contact challenge, suggesting that the defect resides primarily in the inability of antigen-specific T cells to home to and be activated in these nodes. Indeed, L-selectin–deficient mice mount completely normal CHS responses when alternate routes of immunization are used. These studies pinpoint the lesion in CHS to a discrete stage of the afferent limb of the response, clarify the role of L-selectin on effector populations, and illustrate the critical importance of the route of antigen entry to the successful execution of an immune response.

Address correspondence to Pila Estess, Laboratory of Molecular Pathology, Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235-9072.

M.H. Siegelman received support from the National Institute of Health (NIH) (R01 CA57571) and The Welch Foundation (I-227). P. Estess received support from NIH (RO1 AI32855). M.C. Carroll received support from NIH (AI 32544 and HD 1746). A. Takashima received support from NIH (RO1 AR35068 and RO1 AI43777). M.D. Catalina is a student in the Graduate Program of Immunology, Graduate School of Biomedical Sciences, UTSWMCD.

1Abbreviations used in this paper: CHS, contact hypersensitivity; DNBS, 2,4-dinitrobenzene sulfonic acid; DNFB, 2,4-dinitrofluorobenzene; DTH, delayed-type hypersensitivity; ES, embryonic stem; LC, Langerhans cells; MLN, mesenteric lymph node; oxazolone, 2-phenyl-4-ethoxymethylene oxazolone; PGKneo, phosphoglycerate kinase promoter/neomycin resistance gene; PLN, peripheral lymph node; PNAd, peripheral node addressin; TNBS, trinitrobenzene sulfonic acid.


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