Cigarette Tar Enhanced ECs Pyroptosis via CAMKII/Drp1/mtDNA: Novel Insight Into the Mechanism of Plaque Erosion.

Smoking is the only cardiovascular risk factor for plaque erosion. We found cigarette tar resulted in erosion-like lesion development in apolipoprotein E mice, with mural thrombosis, discontinuous endothelium, platelet activation, smooth muscle cell proliferation, and hyaluronic acid accumulation in the aorta. Single-cell transcriptomics revealed that genes relating to pyroptosis, platelet activation, and leukocytes adhesion were significantly increased in an endothelial cell subset. Rescue assays indicated cigarette tar caused human coronary artery endothelial cell pyroptosis by enhanced calcium-calmodulin-dependent protein kinase II / dynamin-related protein 1-mediated mitochondrial fission and mitochondrial DNA release via activating Ca signaling. Inhibition of endothelial cell pyroptosis may be a novel therapeutic strategy to reduce plaque erosion.