Extended Data Fig. 7: Canrenone reverses cold (4 °C) preservation-induced transcriptomic changes in Cardiomyocytes Cluster 1 (CM1) and Cardiomyocytes Cluster 2 (CM2) within human donor hearts during storage.

a. Cold preservation induced gene expression was identified by comparing human donor heart with 10 h of preservation compared to baseline. Red dots indicate upregulated genes in CM1 population during cold storage while blue dots show the effect of canrenone on genes represented by the red dots. Light blue dots indicate downregulated genes in CM1 population during cold storage while purple dots show the effect of canrenone on genes represented by the light blue dots. Volcano plot demonstrates that Canrenone reverses the cold preservation-induced global up- and downregulated genes in CM1. b. Heatmap of gene expression in CM1 of human donor hearts cold (4 °C) preserved for 10 h versus baseline (n = 3/group). Juxtaposed to the right is the HTK+Canr versus HTK+Veh effect on gene expression following 10 h of cold (4°C) preservation of human donor hearts (n = 3/group). c. Cold preservation induced gene expression was identified by comparing human donor heart with 10 h of preservation compared to baseline. Red dots indicate upregulated genes in CM2 population during cold storage while blue dots show the effect of canrenone on genes represented by the red dots. Light blue dots indicate downregulated genes in CM2 population during cold storage while purple dots show the effect of canrenone on genes represented by the light blue dots. Volcano plot demonstrates that Canrenone reverses the cold preservation-induced global up- and downregulated genes in CM2. d. Heatmap of gene expression in CM2 of human donor hearts cold (4 °C) preserved for 10 h versus baseline (n = 3/group). Juxtaposed to the right is the HTK+Canr versus HTK+Veh effect on gene expression following 10 h of cold (4 °C) preservation of human donor hearts (n = 3/group). Baseline is where samples were collected in the back table immediately following preservation solution administration and removal of the donor heart from the surgical field.