ArticleClinical and translational medicine2026
Re-analysis of single-cell transcriptomics reveals a critical role of TNS1 gene in driving contractile VSMC transdifferentiation into macrophage-like SMC and atherosclerotic plaque instability.
Article in Clinical and translational medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundVascular smooth muscle cell (VSMC) phenotype switching plays a significant role in the pathogenesis of atherosclerosis (AS). However, the subtypes of VSMC transdifferentiation and their impact on AS progression and atherosclerotic plaque instability remains unclear.
methodsWe reanalysed scRNA-seq datasets of GSE155513 and GSE253903 and performed single-sample gene set enrichment analysis (ssGSEA) in three transcriptome datasets from unstable plaques to determine the major subtypes contributing the most to plaque instability. Using high-dimensional weighted gene co-expression network analysis (hdWGCNA), we identified hub genes in macrophage (MP)-like smooth muscle cells (SMCs) of unstable plaques. We conducted cell communication analysis according to tensin1 (TNS1) gene levels in VSMCs. TNS1 expression was analysed in human AS plaques. Finally, an AS model was established in VSMC-specific Tns1 knockout ApoE
resultsMP-like SMC was identified as the key subtype for plaque instability. hdWGCNA analysis for MP-like SMC identified blue module as the key gene module involved in unstable plaques. Decreased TNS1 expression in VSMCs was positively correlated with the down-regulation of contractile VSMC marker genes, SRF and MYCOD genes, negatively correlated with the up-regulation of CD68 and KLF4 genes, and activated VCAM, PDGF, THBS and CXCL signalling pathways. TNS1 mRNA expression levels were lower in human atherosclerotic arteries than in healthy arteries, and even lower in unstable plaques than in early and stable plaques. TNS1 protein levels in VSMCs were lower in human atherosclerotic plaques than in healthy arteries, and even lower in advanced plaques than in early plaques. VSMC-specific Tns1 gene deficiency aggravated AS progression and enhanced plaque instability with increased MP-like SMC transdifferentiation.
conclusionThe reduction of TNS1 gene in VSMCs might drive contractile VSMC transdifferentiation into MP-like SMC, the major subtype contributing to plaque instability. In vivo experimental results confirmed the role of Tns1 gene in contractile VSMC transdifferentiation into MP-like SMC and plaque instability.
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