T lymphocytes from rats infected with Nippostrongylus brasiliensis (Nb) release a soluble factor with affinity for IgE that selectively potentiates the IgE response to an unrelated antigen. The factor is derived from Fc(ε) receptors on T cells, binds to surface IgE on precursors of IgE-forming cells, and enhances their differentiation. The factor has a molecular weight of between 10,000 to 20,000 and an affinity for lentil lectin. T cells from Nb-infected rats formed another IgE-binding factor upon incubation with rat IgE. The factor has the ability to suppress rather than enhance the IgE response. The IgE-specific suppressive factor is comparable to IgE-potentiating factor with respect to molecular weight and affinity for IgE but it fails to bind to lentil lectin. The IgE-specific suppressive factor is formed by lymphocytes from complete Freund's adjuvant-treated rats. The results strongly suggest that IgE-binding factors are involved in the regulation of IgE response.
|Original language||English (US)|
|Number of pages||5|
|State||Published - Dec 1 1981|
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