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25 March 2013

Detection of clonal T-cell-receptor (TCR) Vbeta rearrangements in explanted dilated cardiomyopathy hearts by semi-nested PCR, GeneScan, and direct sequencing

Jan-Henrik BlohmBCDE, Nadine BlohmBC, Michael HummelABDEFG, Hans-Henning MüllerBCD, Roland HetzerAEG, Maria RohdeBCF, Hans LehmkuhlAEG, Michel NoutsiasABCDEFG

DOI: 10.12659/MSMBR.883851

Med Sci Monit Basic Res 2013; 19:111-117

Abstract

BACKGROUND: Viral infection and anti-cardiac immunity are involved in the pathogenesis of dilated cardiomyopathy (DCM). Immunity targeting particular antigens may evoke expansion of reactive T-cell clones.

MATERIAL AND METHODS: Myocardial tissues from explanted hearts were investigated for clonal T-cell-receptor- (TCR-) ß rearrangements by an established semi-nested polymerase chain reaction (PCR), followed by high-resolution GeneScan analysis and direct sequencing. From 17 explanted DCM hearts, 3 myocardial samples each were obtained from the right ventricle, the septum, and the left ventricle (total: 9 myocardial samples per case). Six explanted hearts with non-DCM cardiomyopathy entities served as controls.

RESULTS: GeneScan analysis revealed polyclonal TCR-ß rearrangements in all controls. In contrast, at least 1 myocardial sample in 9 out of 17 DCM hearts (total: 20 of the 81 DCM specimens) displayed single dominant TCR-ß PCR products consistent with the presence of clonal T-cell populations. Direct sequencing of the clonal TCR-ß PCR-products disclosed an involvement of Vß 19.01 segments in 14 of the dominant amplificates (70%). Further TCR-Vß segments involved in clonal TCR-ß rearrangements of DCM hearts were Vß 6-1.01 (n=1), Vß 6-3.01 (n=2), Vß 6-5.01 (n=1), Vß 10-3.02 (n=1), and Vß 19.03 (n=1).

CONCLUSIONS: The detectability of clonal TCR-ß rearrangements indicates a pathogenic relevance of this finding in DCM. The predominance of Vß 19.01 segments suggests that the immune response in DCM patients targets particular epitopes. However, the partly heterogenic TCR-ß populations in various myocardial samples from the respective cases support the notion that T-cell immunity may target multiple epitopes in human DCM.

Keywords: Myocardium - pathology, Myocarditis - pathology, Gene Rearrangement, beta-Chain T-Cell Antigen Receptor - genetics, Epitopes - chemistry, Cardiomyopathy, Dilated - pathology, Antigens - chemistry, Polymerase Chain Reaction - methods, Sequence Analysis, DNA - methods

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Medical Science Monitor Basic Research eISSN: 2325-4416
Medical Science Monitor Basic Research eISSN: 2325-4416