Adhesion through the LFA-1 (CD11a/CD18)-ICAM-1 (CD54) and the VLA-4 (CD49d)-VCAM-1 (CD106) pathways prevents apoptosis of germinal center B cells

G. Koopman, R. M. Keehnen, E. Lindhout, W. Newman, Y. Shimizu, G. A. van Seventer, C. de Groot, S. T. Pals

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In the germinal center (GC), B cells are either selected to become memory cells or are eliminated through the process of programmed cell death. FDC which are intimately associated with the GC B cells are thought to be important in this selection process. Previously, we have shown that the LFA-1 (CD11a/CD18)-ICAM-1 (CD54) and VLA-4 (CD49d)-VCAM-1 (CD106) adhesion pathways are involved in FDC-B cell interaction. In the present study, we have explored whether these adhesive interactions contribute to the process of B cell selection by studying the effects on apoptosis of GC B cells. Using FDC and B cells derived from human tonsils, we found that only B cells adherent to FDC remain viable: disruption of FDC-B-cell clusters with mAb against LFA-1 alpha (CD11a), VLA-4 (CD49d), ICAM-1 (CD54), or VCAM-1 (CD106) results in apoptosis of the B cells. Furthermore, we found that GC B cells, upon adhesion to plastic-coated purified ICAM-1 (CD54) or VCAM-1 (CD106), show diminished apoptosis. Importantly, we observed that, at low concentration, ICAM-1 (CD54) and VCAM-1 (CD106) act synergistically with anti-IgM, in inhibiting apoptosis. Together, our data strongly suggest that adhesion of B cells via the LFA-1 (CD11a/CD18)-ICAM-1 (CD54) pathway and VLA-4 (CD49d)-VCAM-1 (CD106) pathway contributes to B cell selection
Original languageEnglish
Pages (from-to)3760-3767
JournalJournal of immunology (Baltimore, Md.
Issue number8
Publication statusPublished - 1994

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