The Journal of Immunology, Vol 135, Issue 1 223-228, Copyright © 1985 by American Association of Immunologists

ARTICLES

A myelin basic protein-specific T lymphocyte line that mediates experimental autoimmune encephalomyelitis

AA Vandenbark, T Gill and H Offner

A T lymphocyte line, BP-1, expressing the T helper phenotype was selected from Lewis rats immunized with guinea pig myelin basic protein (GP-BP) in complete Freund's adjuvant (CFA). The BP-1 line responded specifically to GP-BP but not to PPD after the first round of selection, and responded to rat but not human or bovine BP. When injected i.p. into histocompatible Lewis or F1 (Lewis X P2) recipients, the BP-1 line induced both clinical signs of experimental autoimmune encephalomyelitis (EAE) and delayed type hypersensitivity (DTH) reactions in ears challenged intradermally with GP-BP but not PPD. The severity of clinical signs and the degree of ear swelling were dependent on the dose of BP-1 cells injected. Both activities were detectable with as few as 0.1 X 10(6) BP-1 line cells and required prior activation of the line cells with GP-BP presented by accessory cells. Lewis rats that had recovered from EAE induced by injection of GP-BP in CFA were more susceptible than naive rats to BP-1 line- mediated disease, requiring as few as 0.03 X 10(6) line cells. Clinical EAE and DTH could be serially transferred into F1 (Lewis X P2) recipients with BP-1 cells and back to nonirradiated Lewis parents with activated splenocytes, suggesting that BP-1 cells persist in recipient rats. These results demonstrate the potent biologic activities of an autoreactive BP-specific T lymphocyte line. This line possesses properties similar to BP lines described previously as well as to culture-conditioned splenic T effector cells; thus, the data presented here bridge the gap between these two approaches for studying T effector lymphocyte functions.

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