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Proteomic Signatures of Thymomas
Linan Wang1,2, Owen E Branson1,2, Konstantin Shilo3
1Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, United States of America.
Plos One
|November 11, 2016
Summary
This study characterized thymoma subtypes using proteomics, identifying desmoyokin as a potential marker for distinguishing type A thymomas, which originate from the thymic medulla.
Area of Science:
- Proteomics
- Oncology
- Histopathology
Background:
- The World Health Organization (WHO) classifies thymomas into subtypes A, AB, B1, B2, and B3 based on histology and patient outcomes.
- Thymoma subtypes A and B are hypothesized to originate from the thymic medulla and cortex, respectively.
- Histological overlap between thymoma subtypes complicates accurate diagnosis.
Purpose of the Study:
- To perform proteomic characterization of thymoma subtypes.
- To identify potential immunohistochemical markers for improved tissue diagnosis.
- To differentiate between thymoma subtypes based on protein expression profiles.
Main Methods:
- Proteomic analysis using liquid chromatography tandem mass spectrometry (LC-MS/MS) on formalin-fixed paraffin-embedded tissues.
- Pair-wise comparison of neoplastic and normal thymus tissue.
- Hierarchical clustering to segregate thymoma subtypes.
- Immunohistochemistry to validate protein expression and localization.
Main Results:
- Identified 61 differentially expressed proteins in thymomas compared to normal thymus.
- Hierarchical clustering revealed distinct groupings for subtypes AB, B1, B2, and A/B3.
- Desmoyokin (encoded by the AHNAK gene) was significantly associated with type A thymomas and the thymic medulla.
- Desmoyokin demonstrated potential as an immunohistochemical marker for differentiating type A from type B3 thymomas.
Conclusions:
- Global proteomic characterization identified unique proteins for different thymic compartments and thymoma subtypes.
- Desmoyokin is a medulla-specific protein with potential as an immunohistochemical marker for distinguishing type A and B3 thymomas.
- Proteomic analysis aids in understanding thymoma heterogeneity and improving diagnostic accuracy.
