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HLA-B∗1502–bound peptides: Implications for the pathogenesis of carbamazepine-induced Stevens-Johnson syndrome

2007; Elsevier BV; Volume: 120; Issue: 4 Linguagem: Inglês

10.1016/j.jaci.2007.06.017

1097-6825

Chih-Wen Ou Yang, Wen‐Hung Chung, Chiun‐Gung Juo, Ya‐Ping Lin, Wu-Hsiang Fang, I-Ling Lu, Shui‐Tein Chen, Yuan-Tsong Chen,

Pneumocystis jirovecii pneumonia detection and treatment

BackgroundStevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) can involve MHC-restricted presentation of a drug or its metabolites for T-cell activation. HLA-B∗1502 tightly associated with carbamazepine (CBZ) induced these conditions in a Han Chinese population.ObjectiveWe sought to identify HLA-B∗1502–bound peptides that might be involved in CBZ-induced SJS/TEN.MethodsSoluble HLA-B∗1502 was used to identify bound peptides in the presence and absence of CBZ by using liquid chromatography–tandem mass spectrometry. Peptide-binding assays were performed to detect the specific interaction between the HLA molecule and the identified peptides. Mass spectra were compared to detect CBZ-modified peptides.ResultsWe identified more than 145 peptides bound to HLA-B∗1502. In 13 of 15 peptides examined, we functionally confirmed their specificity with binding assays. Preferable uses of these peptides at the anchoring residues P2 and P9 were similar to those observed in other HLA-B alleles in the Han Chinese population. However, the preferable use of serine residues at the nonanchoring position (P) 5, P6, P7, and P8 appeared to be unique for the B∗1502 peptides. No specific CBZ-modified peptides were detected when we compared the mass spectra of peptides detected in the presence or absence of the drug.ConclusionNoncovalent interaction between a drug and an HLA complex might contribute to cytotoxic T cell–mediated cell death in patients with SJS/TEN.Clinical implicationsAn understanding of pharmacologic interaction of drugs with an HLA complex might lead to safer drugs that avoid SJS/TEN. Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) can involve MHC-restricted presentation of a drug or its metabolites for T-cell activation. HLA-B∗1502 tightly associated with carbamazepine (CBZ) induced these conditions in a Han Chinese population. We sought to identify HLA-B∗1502–bound peptides that might be involved in CBZ-induced SJS/TEN. Soluble HLA-B∗1502 was used to identify bound peptides in the presence and absence of CBZ by using liquid chromatography–tandem mass spectrometry. Peptide-binding assays were performed to detect the specific interaction between the HLA molecule and the identified peptides. Mass spectra were compared to detect CBZ-modified peptides. We identified more than 145 peptides bound to HLA-B∗1502. In 13 of 15 peptides examined, we functionally confirmed their specificity with binding assays. Preferable uses of these peptides at the anchoring residues P2 and P9 were similar to those observed in other HLA-B alleles in the Han Chinese population. However, the preferable use of serine residues at the nonanchoring position (P) 5, P6, P7, and P8 appeared to be unique for the B∗1502 peptides. No specific CBZ-modified peptides were detected when we compared the mass spectra of peptides detected in the presence or absence of the drug. Noncovalent interaction between a drug and an HLA complex might contribute to cytotoxic T cell–mediated cell death in patients with SJS/TEN.