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*
Physiology Program, Harvard School of Public Health, Boston, MA 02115;
Department of Comparative Medicine, University of Alabama, Birmingham, AL 35294; and
Department of Pathology, and
§
Department of Molecular and Human Genetics and Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030
Mutant mice triply deficient in ICAM-1, E-selectin, and P-selectin did not develop the neutrophilic skin lesions that spontaneously arise in mutants doubly deficient in E-selectin and P-selectin. Thus, ICAM-1 is essential to skin disease resulting from endothelial selectin deficiency. During experimental dermatitis, acute neutrophil emigration was completely prevented in young mice deficient in both selectins (E/P and E/P/I mutants). However, older E/P mutants with spontaneous skin lesions displayed an endothelial selectin-independent pathway for acute neutrophil emigration. In contrast, emigration remained compromised in E/P/I mutants and CD18 mutants regardless of age or lesions. Experimentally induced chronic lesions elicited this pathway for acute emigration in young E/P mutants. Thus, an endothelial selectin-independent pathway for acute neutrophil emigration is induced in E/P mice by chronic inflammation at distant sites, and this pathway may contribute to skin disease resulting from endothelial selectin deficiency.
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