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Updated: May 11, 2026
Measurement of Antibody Effects on Cellular Function of Isolated Cardiomyocytes
Published on: March 8, 2013
Reduced plakoglobin immunoreactivity in arrhythmogenic cardiomyopathy: methodological considerations
Maartje Noorman1, Sara Hakim, Angeliki Asimaki
1Department of Medical Physiology, University Medical Center Utrecht, 3584CM Utrecht, The Netherlands; Interuniversity Cardiology Institute, The Netherlands.
Background:
Arrhythmogenic cardiomyopathy (AC) primarily is considered to be a desmosomal disease with a predominant right ventricular phenotype. Reduced signal intensity for junctional plakoglobin (JUP) at the intercalated disks has been proposed as a marker that contributes to diagnosis of the disease. In this technical study, we investigated how methodology-related differences caused by tissue preservation and antibody dilutions affect an appropriate diagnosis.
Methods:
Autopsy and biopsy material was available from a total of 7 control and 25 AC patients that fulfilled the diagnostic Task Force Criteria as proposed in 2010. Immunohistochemical analysis was performed on cryosections and formalin-fixed material using antibodies against JUP and N-Cadherin.
Results:
Immunohistochemistry (1:1000 antibody dilution) on formalin-fixed material showed a reduced signal for JUP in 7/10 AC patients in a bidirectional, double-blinded exchange experiment in which 77% of individuals were correctly classified. Unmasking this disturbed JUP pattern was highly dependent on tissue preservation and antibody dilution since on cryosections the disturbed pattern in patients could only be unmasked at a very strong antibody dilution of 1:100000.
Conclusions:
Reduced immunoreactive signal of JUP at the intercalated disks can be observed in a majority of AC patients. These changes can comparably be detected on both cryo- (74%) and formalin-fixed material (70%) but demand a different, highly defined, and uniformly used approach.
Insights
Diagnosing arrhythmogenic cardiomyopathy (AC) relies on detecting reduced junctional plakoglobin (JUP) signals. Optimal detection depends on specific tissue preservation and antibody dilutions for accurate AC diagnosis.
Area of Science:
- Cardiology
- Pathology
- Molecular Biology
Background:
- Arrhythmogenic cardiomyopathy (AC) is a desmosomal disease often affecting the right ventricle.
- Reduced junctional plakoglobin (JUP) signal at intercalated disks is a potential diagnostic marker for AC.
- Methodological variations in tissue preservation and antibody dilutions may impact JUP signal detection.
Purpose of the Study:
- To investigate the impact of tissue preservation and antibody dilutions on the detection of junctional plakoglobin (JUP) in arrhythmogenic cardiomyopathy (AC).
- To assess the reliability of JUP signal intensity as a diagnostic marker for AC under varying technical conditions.
Main Methods:
- Immunohistochemical analysis of autopsy and biopsy samples from 7 control and 25 AC patients (diagnosed by 2010 Task Force Criteria).
- Comparison of JUP and N-Cadherin signals on cryosections and formalin-fixed tissues.
- Evaluation of different antibody dilutions (e.g., 1:1000, 1:100000) in a blinded experimental setup.
Main Results:
- Reduced JUP signal was observed in 7/10 AC patients using formalin-fixed tissue with a 1:1000 antibody dilution, correctly classifying 77% of individuals.
- The disturbed JUP pattern on cryosections required a significantly higher antibody dilution (1:100000) for unmasking.
- Comparable detection rates were achieved on cryo-fixed (74%) and formalin-fixed (70%) material, provided a highly defined approach.
Conclusions:
- Reduced JUP immunoreactive signal at intercalated disks is detectable in a majority of AC patients.
- Detection of JUP changes is feasible on both cryo- and formalin-fixed tissues.
- Standardized and highly defined methodologies are crucial for reliable JUP detection in AC diagnosis.
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