Heemskerk MH, de Paus RA, Lurvink EG, Koning F, Mulder A, Willemze R, van Rood JJ, Falkenburg JH. Dual HLA class I and class II restricted recognition of alloreactive T lymphocytes mediated by a single T cell receptor complex.
Proc Natl Acad Sci U S A 2001;
98:6806-11. [PMID:
11381117 PMCID:
PMC34434 DOI:
10.1073/pnas.111162298]
[Citation(s) in RCA: 71] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The alloreactive human T cell clone MBM15 was found to exhibit dual specificity recognizing both an antigen in the context of the HLA class I A2 molecule and an antigen in the context of the HLA class II DR1. We demonstrated that the dual reactivity that was mediated via a single clonal T cell population depended on specific peptide binding. For complete recognition of the HLA-A2-restricted specificity the interaction of CD8 with HLA class I is essential. Interestingly, interaction of the CD8 molecule with HLA class I contributed to the HLA-DR1-restricted specificity. T cell clone MBM15 expressed two in-frame T cell receptor (TCR) Valpha transcripts (Valpha1 and Valpha2) and one TCR Vbeta transcript (Vbeta13). To elucidate whether two TCR complexes were responsible for the dual recognition or one complex, cytotoxic T cells were transduced with retroviral vectors encoding the different TCR chains. Only T cells transduced with the TCR Valpha1Vbeta13 combination specifically recognized both the HLA-A2(+) and HLA-DR1(+) target cells, whereas the Valpha2Vbeta13 combination did not result in a TCR on the cell surface. Thus a single TCRalphabeta complex can have dual specificity, recognizing both a peptide in the context of HLA class I as well as a peptide in the context of HLA class II. Transactivation of T cells by an unrelated antigen in the context of HLA class II may evoke an HLA class I-specific T cell response. We propose that this finding may have major implications for immunotherapeutic interventions and insight into the development of autoimmune diseases.
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