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2 Subunit Expression
in Developing T Helper 1 (Th1) and Th2 Cells
By

From the * Department of Pathology, Washington University School of Medicine, St. Louis, Missouri
63110; and the 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)
Department of Inflammation/Autoimmune Diseases Hoffmann La-Roche Inc.,
Nutley, New Jersey 07110
2 subunit expression. To determine the basis for this selective
loss, we examined IL-12R
2 subunit expression during Th cell development in response to
T cell treatment with different cytokines. IL-12R
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-
were found to significantly modify IL-12 receptor
2 expression after T cell activation. IL-4 inhibited IL-12R
2 expression leading to the loss of IL-12 signaling, providing an
important point of regulation to promote commitment to the Th2 pathway. IFN-
treatment
of early developing Th2 cells maintained IL-12R
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-
production. Thus, IFN-
may prevent early Th cells from premature commitment to the Th2 pathway. Controlling the expression of the IL-12R
2 subunit could be an important therapeutic
target for the redirection of ongoing Th cell responses.
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