CD11c/CD18 (p150,95) is a beta 2 integrin expressed by myeloid, natural killer and certain lymphoid cells such as some cytotoxic T cell clones and B cell malignancies. We have studied the expression and function of CD11c on resting and activated B lymphocytes. Flow cytometry, immunoprecipitation, and mRNA analyses showed that cell activation with phorbol esters or with a variety of stimuli such as Staphylococcus aureus or anti-mu antibodies in combination with cytokines induced de novo CD11c/CD18 cell surface expression on most B cells while CD11b expression was not affected. Functional analysis of CD11c/CD18 on B cells revealed that it plays a dual role. First, CD11c/CD18 is implicated in B cell proliferation, as demonstrated by the ability of several anti-CD11c monoclonal antibodies to trigger comitogenic signals; and second, the newly expressed CD11c/CD18 mediates B cell binding to fibrinogen. Our data conclusively demonstrate the role of CD11c/CD18 on both B cell activation and adhesion processes.
Regulated expression and function of CD11c/CD18 integrin on human B lymphocytes. Relation between attachment to fibrinogen and triggering of proliferation through CD11c/CD18.
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A A Postigo, A L Corbí, F Sánchez-Madrid, M O de Landázuri; Regulated expression and function of CD11c/CD18 integrin on human B lymphocytes. Relation between attachment to fibrinogen and triggering of proliferation through CD11c/CD18.. J Exp Med 1 December 1991; 174 (6): 1313–1322. doi: https://doi.org/10.1084/jem.174.6.1313
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