The Journal of Immunology, Vol 157, Issue 10 4428-4435, Copyright © 1996 by American Association of Immunologists

ARTICLES

IL-5 receptor expression and Ig secretion from murine B lymphocytes requires coordinated signaling by membrane Ig, IL-4, and IL-5

JD Weber, PC Isakson and JM Purkerson
Monsanto Company/Searle Research and Development, Immunoinflammatory Diseases Department, St. Louis, MO 63198, USA.

Interleukin-5 plays a pivotal role in the regulation of Ig secretion from murine B cells. Resting B cells express few, if any, IL-5 receptors and do not respond to the lymphokine. Culture of resting B cells with IL-4 induced expression of the IL-5R alpha-chain, while signaling through membrane Ig stimulated expression of the IL-5R beta- chain. Surprisingly, IL-4 suppressed expression of the beta-chain on activated B cells and inhibited responsiveness to IL-5 in subsequent cultures. Simultaneous culture of B lymphoblasts with IL-4 and IL-5 elicited sustained expression of the beta-chain and promoted secretion of IgM. Thus, expression of IL-5 receptors and induction of Ig secretion requires coordination of signals provided by membrane Ig, IL- 4, and IL-5.

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