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Single Cell and Spatial Transcriptomics Identify Novel Immune-Stromal Interactions in Cardiac Allograft Vasculopathy.

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Cardiac allograft vasculopathy (CAV), a major cause of heart transplant failure, involves neointimal hyperplasia. This study identifies type 1 interferon-mediated inflammation driven by vascular smooth muscle cells and macrophages as a key driver, suggesting Ruxolitinib as a potential therapy.

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Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Transplantation Science

Background:

  • Cardiac allograft vasculopathy (CAV) is the primary cause of death in heart transplant recipients, characterized by neointimal hyperplasia.
  • Current therapeutic options for CAV are limited, often necessitating retransplantation.
  • The specific cellular and molecular mechanisms driving CAV pathogenesis remain largely undefined.

Purpose of the Study:

  • To transcriptionally characterize CAV and define its neointimal microenvironment using advanced single-cell and spatial transcriptomic techniques.
  • To identify unique cellular players and molecular signals involved in CAV pathogenesis.
  • To explore potential therapeutic targets for preventing or reversing CAV progression.

Main Methods:

  • Single-cell RNA sequencing and spatial transcriptomics of human coronary arteries from CAV patients, atherosclerotic disease patients, and controls.
  • Comparative transcriptional analysis to identify a unique CAV signature.
  • In vivo validation using a mouse model of CAV treated with interferon blockade (Ruxolitinib).

Main Results:

  • A distinct transcriptional signature for CAV was identified, differentiating it from other coronary artery diseases.
  • Modulated vascular smooth muscle cells and specific macrophage subsets were found to dominate the CAV neointima.
  • These cell types appear to interact, propagating type 1 interferon (IFN)-mediated inflammation.
  • Interferon blockade with Ruxolitinib significantly reduced CAV incidence and improved allograft survival in a mouse model.

Conclusions:

  • This study provides a comprehensive characterization of the cellular and transcriptional landscape of CAV.
  • Type 1 interferon signaling, driven by vascular smooth muscle cells and macrophages, is implicated as a key pathway in CAV pathogenesis.
  • Targeting interferon signaling, for example with Ruxolitinib, represents a promising therapeutic strategy for CAV.