Abstract:
:M proteins are coiled-coil dimers expressed on group A streptococcal cell surfaces. They have an important role in host antistreptococcal immunity and in poststreptococcal autoimmune sequelae. Controversy has arisen regarding whether type 5 M proteins are superantigenic for human T cells. To investigate this, we have produced and tested M5 in the form of two novel recombinant proteins. We found no evidence of superantigenicity using either recombinant whole M5 protein (rM5) or recombinant pep M5 protein (rpepM5) to activate peripheral blood mononuclear cells (PBMC) from healthy adult volunteers. Short-term, rM5-specific T-cell lines from different subjects were uniformly self-APC restricted and showed no consistent pattern of TCR V beta usage. A synthetic peptide of M5 residues 217-237 was found to contain epitope(s) recognized by some rM5-specific human T cells. PBMC responses to rM5 and rpepM5 in 3- and 7-day proliferation assays were characteristic of antigenic rather than superantigenic stimulation. We conclude that type 5 M protein activates human T cells as a conventional antigen.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Degnan B,Taylor J,Hawkes C,O'Shea U,Smith J,Robinson JH,Kehoe MA,Boylston A,Goodacre JAdoi
10.1016/S0198-8859(97)00028-1subject
Has Abstractpub_date
1997-04-01 00:00:00pages
206-15issue
2eissn
0198-8859issn
1879-1166pii
S0198-8859(97)00028-1journal_volume
53pub_type
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