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From the * Neuroimmunology Branch, National Institue of Neurological Disorders and Stroke,
National Institutes of Health, Bethesda, Maryland 20892-1400; CD4+ class II-restricted T cells specific for self antigens are thought to be involved in the
pathogenesis of most human autoimmune diseases and molecular mimicry between foreign and
self ligands has been implicated as a possible mechanism for their activation. In this report we
introduce combinatorial peptide libraries as a powerful tool to identify cross-reactive ligands for
these T cells. The antigen recognition of a CD4+ T cell clone (TCC) specific for myelin basic
protein peptide (MBP) (86-96) was dissected by the response to a set of 220 11-mer peptide
sublibraries. Based on the results obtained with the libraries for each position of the antigen, artificial peptides were found that induced proliferative responses at much lower concentrations than MBP(86-96). In addition stimulatory ligands derived from protein sequences of self and
microbial proteins were identified, some of them even more potent agonists than MBP(86-96).
These results indicate that: (a) for at least some autoreactive CD4+ T cells antigen recognition
is highly degenerate; (b) the autoantigen used to establish the TCC represents only a suboptimal ligand for the TCC; (c) a completely random and unbiased approach such as combinatorial
peptide libraries can decrypt the spectrum of stimulatory ligands for a T cell receptor (TCR).
Institut für Organische Chemie,
Universität Tübingen, 72076 Tübingen, Germany; § Naturwissenschaftliches und Medizinisches
Institut an der Universität Tübingen, 72762 Reutlingen, Germany; and
Department of Neurology,
Tübingen University Medical School, 72076 Tübingen, Germany
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