Loss of plakoglobin immunoreactivity in intercalated discs in arrhythmogenic right ventricular cardiomyopathy: Protein mislocalization versus epitope masking
2016
Aims Examine the relevance and cause of reduced plakoglobin immunofluorescence in intercalated discs for arrhythmogenic right ventricular cardiomyopathy (ARVC) and ARVC-like disease in mouse and human.
Methods and Results Normalized semiquantitative immunofluorescence measurements were performed in a standardized format in desmoglein 2-mutant mice with an ARVC-like phenotype (n=6) and in cardiac biopsies from humans with ARVC and non-ARVC heart disease (n=10). Reduced plakoglobin staining was detectable in ARVC only with one antibody directed against a defined epitope but not with three other antibodies reacting with different epitopes of plakoglobin.
Conclusions Reduced plakoglobin staining in intercalated discs of heart tissue from human ARVC patients and in a murine ARVC model is caused by alterations in epitope accessibility and not by protein relocalization.
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