The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 155, 1587-1596, Copyright © 1982 by Rockefeller University Press

ARTICLES

Helper T cell recognition of the variable domains of a mouse myeloma protein (315). Effect of the major histocompatibility complex and domain conformation

T Jorgensen and K Hannestad

We have examined the recognition of the variable (V) domain of the heavy (VH) and light (V lambda 2) chains of mouse myeloma protein 315 by helper T cells. Mice were primed with the isolated V domain in complete Freund's adjuvant, and carrier (V domain)-primed spleen cells were transferred together with hapten (NIP)-primed spleen cells to recipient mice that were boosted with NIP3-Fab-315. The helper cell response to both domains was governed by H-2-linked immune response (Ir) genes, and VH-315 and V lambda 2 displayed different Ir phenotypes. H-2k conferred high responsiveness to VH on three different genetic backgrounds, BALB/c, C3H, and B10; mice of the d and b haplotypes were low responders. Conversely, H-2d conferred high responsiveness to V lambda 2 on two backgrounds, BALB/c and C3H, whereas mice of the k haplotype were low responders to this domain. Non- H-2 genes of the B10 background extinguished the helper cell response to V lambda 2 in animals with the high responder d haplotype. The VH Ir gene mapped to the K-A interval of the H-2 complex. Unfolded (completely reduced and alkylated) V domains primed helper cells as efficiently as folded domains for responses to NIP3-Fab-315, indicating that the helper cells recognized an antigenic determinant that was not conformation-dependent. The data indicate that there exists helper T cells which recognize each member of the M315 pair of V domains independent of the other, and that these V domains are recognized like conventional extrinsic protein antigens.
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