Interleukin-4 Gene Expression in High and Low IgE Responder Mice

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Abstract
Interleukin-4 (IL-4) gene expression in murine spleen cells was examined by stimulation with con-canavalin A (Con A). Spleen cells from a DBA/2 strain of mice, a high IgE responder, expressed IL-4 mRNA within 3 h after incubation with Con A. Maximal IL-4 mRNA expression was observed 6–9 h after stimulation. The amount of IL-4 mRNA induced by Con A was greatest in spleen cells obtained from high IgE responder strains of mice. A trace amount of mRNA was induced in spleen cells from low IgE responder (SJL) mice. The amount of mRNA induced in spleen cells from an intermediate IgE responder (C57BL/6) was smaller than that from high responders, but significantly greater than that from low responders. Spleen cells from IgE nonresponders (SJA/9) developed only a negligible amount of IL-4 mRNA after stimulation with Con A. Time course and optimal concentration of Con A for the expression of IL-4 mRNA were essentially the saηie in high (DBA/2) and low (SJL) responder strains of mice. The decreased expression of IL-4 mRNA in low IgE responder spleen cells upon stimulation was not due to the decrease in Thy-1-positive cells or L3T4-positive cells in the spleen. The results obtained in the present study may indicate that high and low IgE responder traits are determined depending on their levels of IL-4 mRNA expression.

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