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Integrative Molecular Analyses of Inflammatory and Autoimmune Signals in Cardiac Sarcoidosis - PubMed

2 hours ago
  • #cardiac_sarcoidosis
  • #autoimmunity
  • #transcriptomics
  • Single-cell and spatial transcriptomic analyses reveal distinct cellular and gene expression profiles in preserved, granulomatous, and fibrotic regions of cardiac sarcoidosis (CS) hearts.
  • Cardiomyocytes upregulate arrhythmogenic and inflammasome transcripts, while fibroblasts and cardiomyocytes produce chemoattractant cytokines that sustain immune cell infiltration.
  • Granulomas contain macrophages with cell-cell fusion modulators and Th17-skewed T cells that promote B-cell activation and antibody production via B-cell-activating factor.
  • Fibrotic regions feature tertiary lymphoid structures with clonally expanded mature B and plasma cells, producing autoantibodies reactive to cardiac proteins like periplakin (PPL).
  • Identification of PPL as a CS autoantigen may explain shared clinical features with desmosomal cardiomyopathies and offers therapeutic targets to limit granuloma formation and B-cell activation.