Abstract:

Intercellular adhesion molecule 1 (ICAM-1) is a member of the immunoglobulin superfamily that interacts with two integrins, LFA-1 and Mac-1. These interactions are critical for leukocyte extravasation into inflamed tissue. To assess the role of ICAM-1 expression in the pathogenesis of bacterial infection, homozygously mutant mice lacking the ICAM-1 gene were exposed to Staphylococcus aureus. Within 6 days after inoculation 50% of the animals in the ICAM-1(-/-) group, but none of the controls, had died. Despite the high level of mortality, ICAM-1(-/-) mice developed less frequent and less severe arthritis than their wild-type littermates. In agreement, normal mice inoculated with staphylococci and administered anti-ICAM-1 antibodies exhibited a higher frequency of mortality but less severe arthritis than the controls. Our results indicate that ICAM-1 on the one hand provides protection against systemic disease but on the other hand aggravates the local disease manifestation.

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Reprint Status: In File