The extrafollicular-to-follicular transition of human B lymphocytes: induction of functional globotriaosylceramide (CD77) on high threshold occupancy of CD40
UNSPECIFIED (1999) The extrafollicular-to-follicular transition of human B lymphocytes: induction of functional globotriaosylceramide (CD77) on high threshold occupancy of CD40. EUROPEAN JOURNAL OF IMMUNOLOGY, 29 (10). pp. 3236-3244. ISSN 0014-2980Full text not available from this repository.
Amongst lymphocytes, expression of CD77 (globotriaosylceramide, Gb3) is exclusive to B cells of the germinal center (GC). Its acquisition by extrafollicular B cells may thus herald their commitment to a follicular response. Here we show that high threshold occupancy of CD40 by its cognate ligand (CD40L) promotes rapid induction of CD77 expression in non-GC (CD38(lo)) B cells. The kinetics of CD77 acquisition mirrored those of GC-related markers CD95 and CD86 but contrasted with the more delayed increase in CD38 expression. Induction of CD77 was not a simple consequence of cell cycle entry: other conditions of stimulation equally capable of driving proliferation failed to promote CD77 expression. CD77 was functional in that cells were now sensitive to Verotoxin-l, an Escherichia coil-derived ligand of Gb3. These data indicate that acquisition by extrafollicular B cells of CD77 results from high threshold occupancy of CD40, a situation that should be reached physiologically only once a critical level of T cell priming has been achieved.
|Item Type:||Journal Article|
|Subjects:||Q Science > QR Microbiology > QR180 Immunology|
|Journal or Publication Title:||EUROPEAN JOURNAL OF IMMUNOLOGY|
|Publisher:||WILEY-V C H VERLAG GMBH|
|Number of Pages:||9|
|Page Range:||pp. 3236-3244|
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