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Tang B, Myers LK, Rosloniec EF, Whittington KB, Stuart JM, Kang AH. Characterization of Signal Transduction Through the TCR-ζ Chain Following T Cell Stimulation with Analogue Peptides of Type II Collagen 260–267. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.160.7.3135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
The immunodominant T cell determinant of type II collagen (CII) recognized by DBA/1 mice (I-Aq) is CII 260–267. The aims of this study were to determine the role of the amino acid residues within CII 245–270 in T cell signal transduction. To that end, we utilized I-Aq-restricted, CII-specific T cell hybridomas and examined tyrosine phosphorylation of TCR-ζ following stimulation with either wild-type CII 245–270 or a panel of analogue peptides. A variety of patterns occurred, ranging from increased phosphorylation of TCR-ζ to either partial or a complete abrogation of phosphorylation. Critical substitutions also completely abrogated the phosphorylation of ZAP70, a downstream molecule in TCR-ζ signaling. Evaluation of the supernatants of the T cell hybridomas for cytokine production in response to the peptides revealed a close correlation between the induction of phosphorylation of TCR-ζ and the amount of cytokine induced. Selected analogue peptides were tested as tolerogens in neonatal mice. Analogues that did not induce the phosphorylation of ζ chain, such as B3 (CII 251–270s263F→N), were completely unable to induce tolerance, while analogues that caused a partial phosphorylation, such as B6 (CII 251–270s267Q→T) and A3 (CII 245–270s269P→A), induced partial tolerance judged by intermediate degrees of suppression of arthritis. We conclude that discrete alterations in specific amino acid residues of antigenic peptides had profound effects on T cell signaling and that the signaling correlated with T cell cytokine secretion and T cell function in the induction of tolerance and suppression of arthritis.
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Affiliation(s)
| | - Linda K. Myers
- †Pediatrics, University of Tennessee, Memphis, TN 38163; and
| | | | | | - John M. Stuart
- *Medicine and
- ‡Veterans Affairs Medical Center, Memphis, TN 38104
| | - Andrew H. Kang
- *Medicine and
- ‡Veterans Affairs Medical Center, Memphis, TN 38104
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