Transcriptomic Landscape of Circulating Extracellular Vesicles in Heart Transplant Ischemia-Reperfusion

Area of Science:

• Cardiovascular Surgery
• Immunology
• Molecular Biology

Background:

• Ischemia-reperfusion injury (IRI) is a significant complication in heart transplantation, worsening allograft damage.
• The exact molecular mechanisms driving IRI are not fully understood.

Purpose of the Study:

• To investigate changes in plasma extracellular vesicle (EV) gene expression following heart transplantation reperfusion.
• To identify correlations between EV transcriptome profiles and indicators of graft injury and dysfunction.

Main Methods:

• Whole transcriptome RNA sequencing of plasma EVs from 41 heart transplant recipients.
• Analysis of gene expression changes immediately before and 12 hours after reperfusion.
• Correlation analysis between EV gene expression and graft IRI intensity, primary graft dysfunction, and acute rejection.

Main Results:

• Expression of 1317 protein-coding genes in plasma EVs changed 12 hours post-reperfusion.
• Upregulated genes were linked to metabolism and immune activation; downregulated genes to cell survival and ECM organization.
• Four plasma EV genes (ITPKA, DDIT4L, CD19, CYP4A11) correlated with cardiomyocyte injury and primary graft dysfunction.

Conclusions:

• Plasma EVs are sensitive indicators of reperfusion injury in heart transplantation.
• EV gene expression changes reflect lipid metabolism stress and calcium homeostasis imbalance.
• Profiling plasma EV gene expression can elucidate the mechanisms of heart transplant IRI.