We have analyzed requirements for IL-4-induced secretion of IgG1 from anti-Ig-activated B cells. Activated B cell blasts prepared by culture of high density B cells with anti-Ig failed to secrete IgG1 upon subsequent culture with LPS and IL-4. However, IL-4 markedly suppressed IgM secretion in the same cultures. Addition of a mixture of T cell-derived lymphokines or rIL-5 to LPS-stimulated anti-Ig blasts restored IL-4-stimulated IgG1 secretion; rIL-2 further enhanced the response to IL-4 + rIL-5. These results suggest that IL-4, IL-5, and IL-2 cooperate in the regulation of B lymphocyte Ig isotype expression.
Interleukin 5 and interleukin 2 cooperate with interleukin 4 to induce IgG1 secretion from anti-Ig-treated B cells.
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J M Purkerson, M Newberg, G Wise, K R Lynch, P C Isakson; Interleukin 5 and interleukin 2 cooperate with interleukin 4 to induce IgG1 secretion from anti-Ig-treated B cells.. J Exp Med 1 September 1988; 168 (3): 1175–1180. doi: https://doi.org/10.1084/jem.168.3.1175
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