The Journal of Immunology, Vol 141, Issue 6 2050-2056, Copyright © 1988 by American Association of Immunologists

ARTICLES

The effects of IL-4 and IL-5 on the IgA response by murine Peyer's patch B cell subpopulations

DA Lebman and RL Coffman
DNAX Research Institute, Palo Alto, CA 94304-1104.

IL-5 has been shown to specifically enhance IgA secretion in LPS- stimulated splenic B cell cultures. Maximum enhancement of IgA in such cultures, however, requires IL-4 in addition to IL-5. Because the Peyer's patches (PP), compared with spleen and lymph nodes, are enriched for precursors of IgA-secreting cells, we tested whether IL-4 and IL-5 would have a more profound effect on IgA secretion by polyclonally stimulated PP cells than spleen cells. The combination of IL-4 and IL-5 causes a comparable enhancement of IgA secretion in both LPS-stimulated PP and splenic B cell cultures. The majority of IgA secreted in LPS-stimulated PP cell cultures is derived from the sIgA- population. Furthermore, the binding high level of peanut agglutinin, germinal center subpopulation of PP cells is essentially nonresponsive to LPS, even in the presence of lymphokines; the majority of secreted IgA in these cultures is derived from the binding low level of peanut agglutinin population. In contrast to LPS-stimulated cultures, PP B cells secrete considerably more IgA than splenic B cells when polyclonally stimulated by a clone of autoreactive T cells in the presence of IL-4 and IL-5. The majority of IgA made by T cell- stimulated PP cell cultures is derived from the sIgA+ population. In these cultures, sIgA- PP cells and spleen cells secrete comparable levels of IgA and other non-IgM isotypes suggesting that sIgA- PP B cells are similar to splenic B cells in their potential to switch to IgA. In T cell-stimulated cultures the majority of IgA as well as of all other isotypes is also derived from the nongerminal center, binding low level of peanut agglutinin population.

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