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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/03/817/08 $2.00
Volume 185, Number 5, March 3, 1997 817-824

Regulation of the Interleukin (IL)-12R beta 2 Subunit Expression in Developing T Helper 1 (Th1) and Th2 Cells

By Susanne J. Szabo,* Anand S. Dighe,* Ueli Gubler,Dagger and Kenneth M. Murphy*

From the * Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110; and the Dagger  Department of Inflammation/Autoimmune Diseases Hoffmann La-Roche Inc., Nutley, New Jersey 07110

The developmental commitment to a T helper 1 (Th1)- or Th2-type response can significantly influence host immunity to pathogens. Extinction of the IL-12 signaling pathway during early Th2 development provides a mechanism that allows stable phenotype commitment. In this report we demonstrate that extinction of IL-12 signaling in early Th2 cells results from a selective loss of IL-12 receptor (IL-12R) beta 2 subunit expression. To determine the basis for this selective loss, we examined IL-12R beta 2 subunit expression during Th cell development in response to T cell treatment with different cytokines. IL-12R beta 2 is not expressed by naive resting CD4+ T cells, but is induced upon antigen activation through the T cell receptor. Importantly, IL-4 and IFN-gamma were found to significantly modify IL-12 receptor beta 2 expression after T cell activation. IL-4 inhibited IL-12R beta 2 expression leading to the loss of IL-12 signaling, providing an important point of regulation to promote commitment to the Th2 pathway. IFN-gamma treatment of early developing Th2 cells maintained IL-12R beta 2 expression and restored the ability of these cells to functionally respond to IL-12, but did not directly inhibit IL-4 or induce IFN-gamma production. Thus, IFN-gamma may prevent early Th cells from premature commitment to the Th2 pathway. Controlling the expression of the IL-12R beta 2 subunit could be an important therapeutic target for the redirection of ongoing Th cell responses.


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