These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Characterization of two monoclonal idiotype-binding suppressor T cell factors specific for the antibody response to L-glutamic acid60-L-alanine30-L-tyrosine10 (GAT).
    Author: Poon RY, Kapp JA, Pierce CW, Sorensen CM.
    Journal: J Immunol; 1986 Dec 15; 137(12):3709-16. PubMed ID: 2946767.
    Abstract:
    We have previously identified and described two distinct types of suppressor T cell factors specific for the PFC response to L-glutamic acid60-L-alanine30-L-tyrosine10 (GAT) or L-glutamic acid50-L-tyrosine50 (GT). Both of these factors are antigen-specific and I-J+. GAT-TsF1 is not MHC-restricted and is composed of a single polypeptide chain, whereas GAT-TsF2 is MHC-restricted and is composed of two different polypeptide chains. We have not previously found evidence for an obligatory, idiotype-specific suppressor T cell in this suppressor pathway. However, we now report that idiotype-specific suppressor T cells can be elicited by exposing normal spleen cells to GAT-TsF1 or GAT-TsF2 in the absence of antigen in vitro. These factor (TsF1/TsF2)-induced cells have been fused with the AKR thymoma, BW5147, and hybridomas were selected for production of suppressor factors that inhibit GAT-specific antibody responses in vitro. In this report, we characterize one monoclonal factor from each fusion. Neither factor binds GAT or the related co-polymer, GT; both factors have binding sites for GAT-specific idiotypes but not for unrelated idiotypes either in the form of antibody immobilized on Sepharose or as cell surface determinants expressed by B cell hybridomas. Moreover, their reactivities for a panel of monoclonal anti-GAT antibodies are overlapping but not identical. Both factors are composed of two polypeptide chains, and both chains are required for suppressive activity; one chain bears the I-J determinant, whereas the other possesses the idiotype-binding activity of the intact molecule. Both idiotype-binding factors are restricted by MHC- and Igh-linked genes, and transcomplementation is observed in the F1 mice between MHC-congenic and Igh-congenic parents. Both factors are active late in Mishell-Dutton cultures. These data support the contention that these two factors are similar but nonidentical members of an anti-idiotypic class of GAT-specific suppressor factors.
    [Abstract] [Full Text] [Related] [New Search]