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- W4232928670 abstract "β2 integrins are of critical importance for leukocyte extravasation through vascular endothelia and for T cell activation. To elucidate the role of β2 integrins in T cell–mediated immune responses, allergic contact dermatitis (ACD), irritant dermatitis, and delayed-type hypersensitivity (DTH) were assessed in mice lacking the β2 integrin subunit, CD18. ACD and DTH responses, but not edema formation, were severely suppressed in CD18–/– mice. Extravasation of CD18–/– T cells into eczematous skin lesions was greatly impaired, whereas migration of Langerhans cell precursors and dendritic cells was normal in CD18–/– mice. CD18–/–lymph nodes (LNs) contained an abnormal population of CD3–CD44high lymphocytes and showed evidence of widespread T cell activation. T cells from regional LNs of sensitized CD18–/– mice proliferated in response to hapten challenge, and subcutaneous injection of sensitized syngeneic LN cells directly into ears of hapten-challenged naive recipients restored the defective ACD in CD18–/– mice, suggesting that CD18 is not required for priming of naive T cells but is indispensable for T cell extravasation. Thus, a dysfunction of T cells, in addition to granulocytes, may contribute to the pathophysiology of leukocyte adhesion deficiency type I, which arises from mutations in the human CD18 gene." @default.
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- W4232928670 date "2002-01-15" @default.
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- W4232928670 title "β2 integrins are required for skin homing of primed T cells but not for priming naive T cells" @default.
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- W4232928670 doi "https://doi.org/10.1172/jci0211703" @default.
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