The Journal of Experimental Medicine
Torrey Pines Biolabs
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Journal of Experimental Medicine, Vol 159, 1096-1104, Copyright © 1984 by Rockefeller University Press

ARTICLES

Functional roles of two polypeptide chains that compose an antigen- specific suppressor T cell factor

M Taniguchi, T Tokuhisa, T Itoh and M Kanno

The functional roles of the two polypeptide chains that compose the T cell suppressor factor (TsF) that mediates the antigen-specific and genetically restricted suppressor function were studied by using the heavy or light chains isolated from the conventional TsF or the 11S and 13S mRNA translation products of TsF. Either the heavy or the light chain of mRNA translation products reconstitutes the active TsF that suppresses the antibody response in an antigen-specific and genetically restricted manner when it is combined with the isolated heavy or light chain from the conventional TsF. As a consequence, the antigen-binding heavy chain mediates the antigen specificity of TsF. On the other hand, the I-J-positive light chain works as an element to determine the genetic restriction specificity. Thus, the identity of the histocompatibility between the I-J haplotypes on the light chain and the responding cell is essential for the functional expression of TsF. No genetic preference, however, was observed, in the association of the heavy and light chains of TsF.
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