High-Dimensional Vitreous Proteomics Identifies Epigenetic Pathway Signatures in Vitreoretinal Lymphoma

Area of Science:

• Ophthalmology
• Oncology
• Proteomics

Background:

• Vitreoretinal lymphoma (VRL) is an intraocular malignancy often presenting as diffuse large B-cell lymphoma (DLBCL).
• Understanding the intraocular molecular landscape of VRL is crucial for diagnosis and targeted therapy.

Purpose of the Study:

• To characterize systemic vitreous proteomic alterations in VRL.
• To determine if DLBCL-associated proteomic signatures are present in the intraocular microenvironment.

Main Methods:

• A cross-sectional study involving 11 VRL patients and 4 macular hole controls.
• Vitreous samples analyzed using the SomaScan 7K proteomic platform to quantify 6981 proteins.
• Differential expression analysis and pathway enrichment (Gene Ontology, Reactome) were performed.

Main Results:

• VRL vitreous samples exhibited a distinct proteomic signature with 2499 differentially expressed proteins.
• Significant enrichment of nuclear, chromatin-related, and epigenetic regulatory pathways (e.g., DNA methylation, histone modification) was observed in VRL.
• Pathways related to extracellular matrix organization and growth factor signaling were relatively reduced in VRL.

Conclusions:

• VRL is characterized by increased nuclear/epigenetic proteins and decreased extracellular proteins, indicating significant intraocular microenvironment remodeling.
• High-dimensional vitreous proteomics can capture lymphoma-related proteomic features.
• This approach provides a framework for molecular characterization and biomarker discovery in intraocular lymphoma.