血管平滑肌
细胞生物学
祖细胞
转录组
生物
血管紧张素II
癌症研究
干细胞
受体
基因
基因表达
遗传学
内分泌学
平滑肌
作者
Tarik Hadi,Michele Silvestro,Cristobal Rivera Martinez,Rayan Sleiman Tellaoui,ariadne zias,Bhama Ramkhelawon
出处
期刊:Circulation
[Ovid Technologies (Wolters Kluwer)]
日期:2020-11-17
卷期号:142 (Suppl_3)
标识
DOI:10.1161/circ.142.suppl_3.16808
摘要
Introduction: Loss of vascular smooth-muscle cells (vSMC) and subsequent defective replenishment of functional vSMC de novo are pathological hallmarks of abdominal aortic aneurysm (AAA). Evidence suggests that clusters of progenitors can be reprogrammed into vSMC lineage following vascular injury. However, the landscape of vSMC precursors and reprograming signatures that determine their fate in AAA is undefined. Hypothesis: We hypothesize that quiescent progenitor pools reside in aorta and undergo spatiotemporal fate decision into mature vSMC in AAA. We speculate that distinct ligand-receptor and transcriptional signals gear their pathogenic trajectories into dysfunctional vSMC in AAA. Methods & Results: Single-cell RNA-sequencing (scRNA-seq) identified vascular progenitor cells (Cd34 + Pdgfrα+) in murine (angiotensin II-induced) and human AAA. Pseudotime analysis tracked two differentiation fates of progenitors into divergent mature vSMC pools characterized by enrichment in contractile cytoskeleton machinery (Acta2 + Myh11 + ) or abnormally supplemented with matrix remodeling genes (Mmp2 + Col8a1 + ). Mmp2 + Col8a1 + clusters were dominant in AAA suggesting pathological reprograming in AAA. Gene regulatory network analysis mapped distinct libraries of upstream transcription factors in each mature vSMC states in AAA. Acta2 + Myh11 + and Mmp2 + Col8a1 + transcriptomes were driven by opposing actions of Pparγ and its repressor Runx1 respectively. Interestingly, cellular interaction analysis revealed that platelet-derived Pdgfβ fueled the phenotypic switch into Mmp2 + Col8a1 + vSMC via its receptor Pdgfrα. Dampening Pdgfrα signaling by systemic platelet depletion repressed Runx1 activation thereby increasing Pparγ transcriptomic activity in progenitors in the aortic wall. This rescued functional regeneration of vSMC (Acta2 + Myh11 + ) with contractile properties consistent with reduced aortic damage and diminished AAA incidence. Conclusions: Our data demonstrate that platelets are novel actors capable of awakening progenitor pools by coding their fate into pathogenic vSMC lineage in AAA. We provide evidence suggesting that strategies aimed at sustaining vSMC contractile destiny could encourage repair of vascular damage in AAA.
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