Single-cell transcriptomic atlas of human cardiac arteries
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE198750 | GEO | 2025/03/15
REPOSITORIES: GEO
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Project description:Dysfunction of pulmonary arterial endothelial cells (PAECs) is associated with the development and progression of vascular pathology. However, it remains unknown how pulmonary hypertension (PH) affects cellular composition and transcriptomic profile of pulmonary endothelium. Here, we have undertaken a single-cell, compartment specific approach to characterise alterations in PAECs associated with two different types of PH, i.e., pulmonary arterial hypertension (PAH) and pulmonary hypertension associated with pulmonary fibrosis (PHPF). Our unbiased analysis showed that endothelium of medium / small caliber pulmonary arteries is composed of three subsets of endothelial cells (ECs). The analysis of healthy and PH endothelium revealed that the three populations are persistently represented in remodelled arteries. Additionally, an exploratory analysis of human aorta (AO) and coronary arteries (CA) endothelium revealed that, although similar gene expression patterns were noticeable, PAECs subpopulations proportions differs significantly from pulmonary arteries (PA) endothelium. To address whether EC heterogeneity is a prime feature of human endothelium, we also performed a similar analysis in a murine model of hypoxia, revealing that similar EC populations were evident in this animal model. Comparative analysis of EC subpopulations in healthy and PH EC identified a common genetic deregulation accompanying vascular remodelling. Even though murine EC displayed some similarities with human EC subpopulations, the intense re-programming associated with hypoxia associated vascular remodelling displayed significant differences compared to the human disease. Finally, in depth comparative analysis of PAH and PHPF EC highlighted the development of disease-specific transcriptomic alterations in the three populations. Therefore, characterisation of transcriptomic differences in the endothelial bed of PAH and PHPF patients can facilitate identification of novel, disease-specific therapeutic targets.
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Project description:Background: The vascular wall of small arteries is heavily affected by high blood pressure. However, the underlying mechanisms causing vascular changes are not fully elucidated. Using a novel data-independent acquisition mass spectrometry (DIA-MS) approach, we aimed to determine the proteomic changes in small mesenteric arteries during early-onset high blood pressure in a rat model of hypertension. Methods: Snap frozen small mesenteric and renal arteries from the spontaneous hypertension rat (SHR) model and Wistar Kyoto (WKY) control rats were collected from two time points (6- and 12-weels of age) and analyzed by a label free quantitative DIA-MS workflow. Mesenteric arteries from Wister Hannover rats were included as an additional control to clarify genetic drift caused by selective inbreeding. Results: We identified a total of 3956 consistent proteins in the mesenteric artery wall and found that 286 proteins were significantly regulated in 12-weeks old SHRs compared to WKY controls. Comparing to an in silico matrisome database, we identified 38 extracellular matrix-associated proteins that could distinguish SHRs from WKY controls. Furthermore, when comparing the significantly regulated proteins identified in mesenteric and renal arteries, we identified 18 proteins, including Serpina3l, Igg-2a, ENSRNOG00000049829, Acyp2, Enpp3, Lss, Acaa1a, Basp1, an isoform of Basp1, Flot1, Flot2, Gstt1, Nit1, Ppid, Ikbkap, Poglut3, P4ha2 and Usp15, that were changed in both vascular beds. These proteins were associated with vital cellular processes, such as dyslipidemia, protease inhibition, remodeling and generation of reactive oxygen species. Majority of the identified proteins and pathways were associated with hypertension, and mapping the underlying changes help understanding the pathological processes occurring in the arterial wall during early-onset hypertension. Conclusions: Our data provides an in-depth analysis of the proteomic architecture of the mesenteric and renal artery wall from SHRs and WKY control rats. We identified 18 novel candidate proteins that highlights critical changes in small arteries of the SHR.
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