Abstract
Antibiotic-refractory Lyme arthritis is believed to result from an infection-induced autoimmune response triggered by the spirochete Borrelia burgdorferi (Bb). Disease susceptibility is associated with the HLA alleles DRB1*0101, 0401, 0402, 0404, 0405 and DRB5*0101, and all these MHC molecules bind the Bb epitope OspA(163-175.) However, not all patients have a proliferative response to this epitope. To identify other possible Bb epitopes involved in this disease process, the algorithm TEPITOPE was used to scan 17 immunogenic Bb proteins for potential T cell epitopes with a refractory arthritis-associated MHC binding profile, and the Bb proteome was searched for peptides with sequence homology to OspA(165-173). Sixteen promising T epitopes were identified and their MHC binding profiles to 13 MHC molecules were verified using in vitro MHC/peptide binding assays. One peptide, BBK32(392-404), had a strong refractory arthritis-associated MHC binding profile, and another GK(297-306) shared sequence homology to OspA(165-173). However, patient cells did not proliferate in response to either peptide making it highly unlikely they were involved in a refractory course. A comparison of the in silico and in vitro results revealed that TEPIT...Continue Reading
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