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Self la-recognizing T cells undergo an ordered series of interactions with ia-bearing substrate cells of defined function during their development: A model

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Conclusion

A four-step scheme of cell interactions between self la-recognizing T cells in the helper T cell lineage and la-bearing substrate cells is proposed. The first interaction, with a veto cell, clears the repertoire of helper T cells specific for self Ia, or self antigens in association with self Ia. The second interaction, between helper T cells and Ia on thymic epithelium expands self Ia-recognizing T cells; T cell diotopes displayed on the epithelial cell surface may play the role of an internal antigenic image for this expansion. The third interaction occurs between antigen-presenting cell Ia plus nominal antigen and virgin Lyl T cells, leading to T cell activation and expansion. The fourth interaction involves B cells binding specific antigen via their Ig receptor and displaying self Ia, and this antigen-Ia complex is recognized by helper T cells, causing B cell proliferation and differentiation to antibody secretion. A regulatory pathway, involving suppressor T cells that recognize activated helper T cells via self Ia bound to the anti-self Ia receptor on the T cell surface, is also proposed. This model permits any or all of the proposed mechanisms of Ir gene ac tion, and is compatible with one or two site models of T cell receptors. Its main predictions are that Ia density is carefully regulated in substrate cells to allow both self tolerance and self recognition, in an ordered scheme of development.

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Supported by NIH grant AI-14579 and the Howard Hughes Medical Institute.

Investigator, Howard Hughes Medical Institute.

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Janeway, C.A., Katz, M.E. Self la-recognizing T cells undergo an ordered series of interactions with ia-bearing substrate cells of defined function during their development: A model. Surv. immunol. Res. 3, 45–54 (1984). https://doi.org/10.1007/BF02918597

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