Abstract 19241: Downregulation of microRNA-494 Facilitates Smooth Muscle Cell Proliferation and Vascular Remodeling

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Katrin Donde ◽  
Jan-Marcus Daniel ◽  
Jochen Dutzmann ◽  
Johann Bauersachs ◽  
Daniel Sedding
Keyword(s):  
Smooth Muscle ◽  
Vascular Remodeling ◽  
Luciferase Reporter ◽  
Brdu Incorporation ◽  
Dependent Manner ◽  
Functional Impact ◽  
Potential Target ◽  
Cell Counts ◽  
Vascular Proliferative Diseases

Introduction: Proliferation of vascular smooth muscle cells (VSMC) plays a crucial role in the development of vascular proliferative diseases such as atherosclerosis and in-stent-restenosis. MicroRNAs (miR) are small noncoding RNAs that modulate gene expression in a posttranscriptional manner. Hypothesis: in this project we aimed to determine the functional impact of a micro-RNA which is strongly regulated during vascular remodeling. Methods and Results: Neointima formation was induced by a wire-mediated injury of the femoral artery in C57BL/6 mice. Microarray analysis of the developing neointimal lesion showed a strong reduction of miR-494 (0.411±0.04) at 7 days after injury as compared to uninjured controls, which could be confirmed by qPCR. Interestingly, miR-494 was found to be predominantly expressed in SMC as determined by in situ hybridization. The regulation of miR-494 expression was further analyzed in vitro after stimulation of SMC with 10% FCS. Following this mitogenic stimulation, mir-494 expression dropped robustly and significantly in a time-dependent manner at 6, 9, and 24 hours. To investigate the functional impact of miR-494 on SMC proliferation, miR-494 was overexpressed using miR-494-mimics (20μM). Overexpression of miR-494 significantly reduced the FCS-induced proliferation of SMC as assessed by BrdU-incorporation and total cell counts. In silico analyses of potential target genes for miR-494 identified survivin, an important molecule for cell cycle regulation, as potential target of miR-494. Indeed, survivin was found down-regulated on the mRNA and protein level after transfection of SMC with miR-494 mimics and could be confirmed as direct target using luciferase reporter assays. Conclusions: Taken together, our results show that mir-494 is strongly down-regulated in proliferating SMC in vitro as well as during neointimal lesion formation in vivo. Moreover, the anti-proliferative effect of miR-494-reconstitution reveals a crucial functional role of miR-494 in the mitogenic response of SMC. Thus, miR-494 might represent a novel and promising SMC-specific target for future therapeutic strategies in the treatment of vascular proliferative diseases.

Abstract 424: Vascular Smooth Muscle Cell Expression of S100a12 in Vivo Induces Enhanced Oxidative Stress & Vascular Remodeling

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Marion Hofmann Bowman ◽  
Jeannine Wilk ◽  
Gene Kim ◽  
Yanmin Zhang ◽  
Jalees Rehman ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Dna Damage ◽  
Smooth Muscle ◽  
Vascular Remodeling ◽  
Oxidative Dna Damage ◽  
Fold Increase ◽  
Brdu Incorporation ◽  
Elastic Fibers ◽  
Nuclear Staining

S100A12 is a small calcium binding protein that is a signal transduction ligand of the receptor for advance glycation endproducts (RAGE). S100A12, like RAGE, is expressed in the vessel wall of atherosclerotic vasculature, particularly in smooth muscle cells (SMC). While RAGE has been extensively implicated in inflammatory states such as atherosclerosis, the role of S100A12 is less clear. We tested the hypothesis that expression of human S100A12 directly exacerbates vascular inflammation. Several lines of Bl6/J transgenic mice (tg) expressing human S100A12 in SMC under control of the SM22a promoter were generated. Primary aortic SMC from tg and wild type (wt) littermates were isolated and analyzed for (i) proliferation using MTS/Formazan Assay and BrdU incorporation, (ii) oxidative stress using using flow cytometry with MitoSOX antibody, oxidative DNA damage using immunofluorescence microscopy with anti-8-oxo-dG antibody, and NF-kB activation measured by EMSA and (iii) cytokine expression measured by IL-6 ELISA. Furthermore, the aortas from tg and wt mice were examined. Results: Tg but not wt SMC expressed S100A12 protein. Tg SMC had a significant 1.9 to 2.7 fold increase in conversion of MTS into Formazan at 24–96 hours likely reflective of increased metabolic activity since BrdU incorporation into DNA was less in tg compared to wt SMC (4% vs 21% positive BrdU nuclei, p <0.05). Tg SMC showed significantly higher levels of mitochondrial generated ROS, nuclear staining for oxidative DNA damage which was not detected in the nuclei of wt SMC’s, and a 2.5 fold increase in NFkB activity. IL-6 production at baseline was higher in tg SMC’s (615 vs 213 pg/ml, p< 0.05) and increased dramatically after LPS treatment (10 ng/ml) in tg SMC’s (2130 vs 415 pg/ml). Histologic examination of the thoracic aorta at 10 weeks of age revealed increased collagen deposition in the aortic media with fragmentation and disarray of elastic fibers. In vivo ultrasound revealed a progressive dilation of the aortic arch from age 10 weeks to 16 weeks of age (1.27 to 1.60 mm, p<0.05) in tg but not in wt littermate mice (1.30 to 1.33 mm, p=0.1). These data reveal the novel finding that targeted expression of human S100A12 in SMC modulates oxidative stress, inflammation and vascular remodeling.

scholarly journals Protective Effect of Phillyrin on Lethal LPS-Induced Neutrophil Inflammation in Zebrafish

2017 ◽  
Vol 43 (5) ◽  
pp. 2074-2087 ◽  
Author(s):  
Liling Yang ◽  
Xiangjun Zhou ◽  
Weijuan Huang ◽  
Qin Fang ◽  
Jianlan Hu ◽  
...  
Keyword(s):  
Signalling Pathway ◽  
Dependent Manner ◽  
Zebrafish Model ◽  
Lps Challenge ◽  
Cell Counts ◽  
Tnf Α ◽  
Forsythia Suspensa ◽  
Anti Inflammatory

Background/Aims: Forsythia suspensa Vahl. (Oleaceae) fruits are widely used in traditional Chinese medicine to treat pneumonia, typhoid, dysentery, ulcers and oedema. Antibacterial and anti-inflammatory activities have been reported for phillyrin (PHN), the main ingredient in Forsythia suspensa Vahl fruits, in vitro. However, the underlying mechanisms in vivo remain poorly defined. In this study, we discovered that PHN exerted potent anti-inflammatory effects in lethal LPS-induced neutrophil inflammation by suppressing the MyD88-dependent signalling pathway in zebrafish. Methods: LPS-yolk microinjection was used to induce a lethal LPS-infected zebrafish model. The effect of PHN on the survival of zebrafish challenged with lethal LPS was evaluated using survival analysis. The effect of PHN on neutrophil inflammation grading in vivo was assessed by tracking neutrophils with a transgenic line. The effects of PHN on neutrophil production and migration were analysed by SB+ cell counts during consecutive hours after modelling. Additionally, key cytokines and members of the MyD88 signalling pathway that are involved in inflammatory response were detected using quantitative RT-PCR. To assess gene expression changes during consecutive hours after modelling, the IL-1β, IL-6, TNF-α, MyD88, TRIF, ERK1/2, JNK, IκBa and NF-κB expression levels were measured. Results: PHN could protect zebrafish against a lethal LPS challenge in a dose-dependent manner, as indicated by decreased neutrophil infltration, reduced tissue necrosis and increased survival rates. Up-regulated IL-1β, IL-6 and TNF-α expression also showed the same tendencies of depression by PHN. Critically, PHN significantly inhibited the LPS-induced activation of MyD88, IκBa, and NF-κB but did not affect the expression of ERK1/2 MAPKs or JNK MAPKs in LPS-stimulated zebrafish. Additionally, PHN regulated the MyD88/IκBα/NF-κB signalling pathway by controlling IκBα, IL-1β, IL-6, and TNF-α expression. Conclusion: This study provides a rationale for the clinical application of PHN as an anti-inflammatory agent.

scholarly journals Effect of Paclitaxel+Hirudin on the TLR4-MyD88 Signaling Pathway During Inflammatory Activation of Human Coronary Artery Smooth Muscle Cells and Mechanistic Analysis

2018 ◽  
Vol 50 (4) ◽  
pp. 1301-1317 ◽  
Author(s):  
Hongmei Li ◽  
Xian Wang ◽  
Anlong Xu
Keyword(s):  
Smooth Muscle ◽  
Coronary Artery ◽  
Smooth Muscle Cells ◽  
Muscle Cells ◽  
Dependent Manner ◽  
Human Coronary Artery ◽  
Post Intervention ◽  
Inflammatory Activation ◽  
Myd88 Pathway

Background/Aims: Approximately 10%-20% of patients with acute cardiovascular disease who have received coronary intervention suffer restenosis and high inflammation. The stent compound paclitaxel+hirudin was prepared for the treatment of post-intervention restenosis. This study aimed to explore the anti-inflammatory and anti-restenosis mechanisms of paclitaxel+hirudin with regard to the TLR4/MyD88/NF-κB pathway. Methods: Human coronary artery smooth muscle cells (HCASMCs) at 4-6 generations after in vitro culture were used as a model. Lipopolysaccharide (LPS) was used as an inducer to maximally activate the TLR4/MyD88/NF-κB inflammation pathway. After MyD88 knockdown and selective blocking of MyD88 degradation with epoxomicin, the effects of paclitaxel+hirudin stenting on key sites of the TLR4/MyD88/NF-κB pathway were detected using ELISA, Q-PCR, and western blot analysis. Results: LPS at 1 μg/mL for 48 h was the optimal modeling condition for inflammatory activation of HCASMCs. Paclitaxel+hirudin inhibited the levels of key proteins and the gene expression, except for that of the MyD88 gene, of the TLR4-MyD88 pathway. The trend of the effect of paclitaxel+hirudin on the pathway proteins was similar to that of MyD88 knockdown. After epoxomicin intervention, the inhibitory effects of paclitaxel+hirudin on the key genes and proteins of the TLR4-MyD88 pathway were significantly weakened, which even reached pre-intervention levels. Paclitaxel+hirudin affected the MyD88 protein in a dosage-dependent manner. Conclusion: The paclitaxel+hirudin compound promotes MyD88 degradation in the TLR4/MyD88/NF-κB pathway to reduce the activity of TLR4 and NF-κB p65 and to weaken the LPS-initiated inflammatory reactions of IL-1β, IL-6, and TNF-α.

scholarly journals Role of α1-adrenergic receptor subtypes in contractility of the rabbit abdominal aorta in vitro

2013 ◽  
Vol 82 (3) ◽  
pp. 331-336 ◽  
Author(s):  
Jan Gnus ◽  
Albert Czerski ◽  
Stanisław Ferenc ◽  
Wojciech Zawadzki ◽  
Wojciech Witkiewicz ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Receptor Antagonist ◽  
Abdominal Aorta ◽  
Adrenergic Receptor ◽  
Receptor Subtypes ◽  
Organ Bath ◽  
Dependent Manner ◽  
Receptor Antagonists ◽  
Selective Antagonists

Investigation of the effect of α1-adrenergic receptor subtypes on the contraction of the abdominal aorta will allow for more effective treatment of hypertension by use of selective antagonists. The aim of the study was to evaluate the participation of α1-adrenergic receptor subtypes in the contractility of the aortic smooth muscle cells in rabbits. The in vitro experiments were performed in isolated tissue preparations from 30 adult female New Zealand rabbits. The abdominal aortic sections were placed in organ bath chambers and contracted with increasing doses of non-selective α1-adrenergic receptor agonist phenylephrine without pre-incubation or after incubation in α1-adrenergic receptor subtype-selective or non-selective antagonists. Separate sections were incubated with increasing concentrations of antagonists. Phenylephrine caused maximal rise in arterial smooth muscle tone to 4.75 ± 0.47 mN. The most potent in blocking phenylephrine induced contraction was 5-metylurapidil (α1A-adrenergic receptor antagonist) followed by phentolamine and prazosin (non-selective α1-adrenergic receptor antagonists); BMY 7378 (α1D-adrenergic receptor antagonist), cyclazosin and L-765.314 (α1B-adrenergic receptor antagonists) were less effective. All antagonists, except BMY 7378 elicited relaxation of non-precontracted aorta in dose dependent manner. Our results indicate that postsynaptic α1A receptors are the most potent in producing rabbit abdominal aorta contraction, while α1B and α1D subtypes are less effective.

ID: 123: ROLE OF MICRORNA-1 IN REGULATING PULMONARY VASCULAR REMODELING IN PULMONARY ARTERIAL HYPERTENSION

2016 ◽  
Vol 64 (4) ◽  
pp. 969.1-969 ◽  
Author(s):  
JR Sysol ◽  
J Chen ◽  
S Singla ◽  
V Natarajan ◽  
RF Machado ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Pulmonary Arterial Hypertension ◽  
Pulmonary Artery ◽  
Arterial Hypertension ◽  
Vascular Remodeling ◽  
Luciferase Reporter ◽  
Pulmonary Vascular Remodeling ◽  
Pulmonary Arterial ◽  
Pulmonary Artery Smooth Muscle

RationalePulmonary arterial hypertension (PAH) is a severe, progressive disease characterized by increased pulmonary arterial pressure and resistance due in part to uncontrolled vascular remodeling. The mechanisms contributing to vascular remodeling in PAH are poorly understood and involve rampant pulmonary artery smooth muscle cell (PASMC) proliferation. We recently demonstrated the important role of sphingosine kinase 1 (SphK1), a lipid kinase producing pro-proliferative sphingosine-1-phosphate (S1P), in the development of pulmonary vascular remodeling in PAH. However, the regulatory processes involved in upregulation of SphK1 in this disease are unknown.ObjectiveIn this study, we aimed to identify novel molecular mechanisms governing the regulation of SphK1 expression, with a focus on microRNA (miR). Using both in vitro studies in pulmonary artery smooth muscle cells (PASMCs) and an in vivo mouse model of experimental hypoxia-mediated pulmonary hypertension (HPH), we explored the role of miR in controlling SphK1 expression in the development of pulmonary vascular remodeling.Methods and ResultsIn silico analysis identified hsa-miR-1-3p (miR-1) as a candidate targeting SphK1. We demonstrate miR-1 is down-regulated by hypoxia in human PASMCs and in lung tissues of mice with HPH, coinciding with upregulation of SphK1 expression. PASMCs isolated from patients with PAH had significantly reduced expression of miR-1. Transfection of human PASMCs with miR-1 mimics significantly attenuated activity of a SphK1-3'-UTR luciferase reporter construct and SphK1 protein expression. miR-1 overexpression in human PASMCs also inhibited proliferation and migration under normoxic and hypoxic conditions, both important in pathogenic vascular remodeling in PAH. Finally, we demonstrated that intravenous administration of miR-1 mimics prevents the development of experimental HPH in mice and attenuates induction of SphK1 in PASMCs.ConclusionThese data demonstrate that miR-1 expression in reduced in PASMCs from PAH patients, is modulated by hypoxia, and regulates the expression of SphK1. Key phenotypic aspects of vascular remodeling are influenced by miR-1 and its overexpression can prevent the development of HPH in mice. These studies further our understanding of the mechanisms underlying pathogenic pulmonary vascular remodeling in PAH and could lead to novel therapeutic targets.Supported by grants NIH/NHLBI R01 HL127342 and R01 HL111656 to RFM, NIH/NHLBI P01 HL98050 and R01 HL127342 to VN, American Heart Association Predoctoral Fellowship (15PRE2190004) to JRS, and NIH/NLHBI NRSA F30 Fellowship (FHL128034A) to JRS.

VIP inhibits basal and histamine-stimulated proliferation of human airway smooth muscle cells

1995 ◽  
Vol 268 (6) ◽  
pp. L1047-L1051 ◽  
Author(s):  
K. Maruno ◽  
A. Absood ◽  
S. I. Said
Keyword(s):  
Smooth Muscle ◽  
Airway Smooth Muscle ◽  
Thymidine Incorporation ◽  
Inhibitory Effect ◽  
Airway Smooth Muscle Cells ◽  
Dependent Manner ◽  
Cyclic Monophosphate ◽  
Cell Counts ◽  
Dependent Protein ◽  
Camp Levels

Airway smooth muscle (ASM) cell proliferation contributes to increased airway resistance in bronchial asthma. We have examined the modulation of ASM proliferation by vasoactive intestinal peptide (VIP), a cotransmitter of airway relaxation. Human ASM cells were grown in culture as a monolayer. VIP (1.0 nM-1.0 microM) inhibited proliferation in a dose-dependent manner by up to 82% on day 2, but the related peptide glucagon had no effect. Histamine (100 nM-100 microM) increased cell counts by 66%, but in the presence of VIP, cell counts and [3H]thymidine incorporation were reduced by up to 55%. Adenosine 3',5'-cyclic monophosphate (cAMP)-promoting agents, including 3-isobutyl-1-methylxanthine, forskolin, and 8-bromo-adenosine 3',5'-cyclic monophosphate, alone and especially combined with VIP, reduced cell counts and [3H]thymidine incorporation, in correlation with cAMP levels. KT-5720 (1.0 nM-1.0 microM), a selective inhibitor of cAMP-dependent protein kinase A (PKA), abolished the inhibitory effect of VIP. The results show that VIP selectively and potently inhibits human ASM cell growth and multiplication, and nullifies the mitogenic effect of histamine, by a PKA-mediated mechanism. A deficiency of VIP may lead to ASM hyperplasia due to unopposed stimulation by endogenous mitogens.

scholarly journals Interleukin-9 Deletion Relieves Vascular Dysfunction and Decreases Blood Pressure via the STAT3 Pathway in Angiotensin II-Treated Mice

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Yunzhao Yang ◽  
Shaoqun Tang ◽  
Chunchun Zhai ◽  
Xin Zeng ◽  
Qingjian Liu ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Smooth Muscle ◽  
Angiotensin Ii ◽  
Inflammatory Response ◽  
Vascular Dysfunction ◽  
Control Group ◽  
Dependent Manner ◽  
Ang Ii ◽  
Stat3 Pathway

Background. Multiple interleukin (IL) family members were reported to be closely related to hypertension. We aimed to investigate whether IL-9 affects angiotensin II- (Ang II-) induced hypertension in mice. Methods. Mice were treated with Ang II, and IL-9 expression was determined. In addition, effects of IL-9 knockout (KO) on blood pressure were observed in Ang II-infused mice. To determine whether the effects of IL-9 on blood pressure was mediated by the signal transducer and activator of the transcription 3 (STAT3) pathway, Ang II-treated mice were given S31-201. Furthermore, circulating IL-9 levels in patients with hypertension were measured. Results. Ang II treatment increased serum and aortic IL-9 expression in a dose-dependent manner; IL-9 levels were the highest in the second week and continued to remain high into the fourth week after the treatment. IL-9 KO downregulated proinflammatory cytokine expression, whereas it upregulated anti-inflammatory cytokine levels, relieved vascular dysfunction, and decreased blood pressure in Ang II-infused mice. IL-9 also reduced smooth muscle 22α (SM22α) expression and increased osteopontin (OPN) levels both in mice and in vitro. The effects of IL-9 KO on blood pressure and inflammatory response were significantly reduced by S31-201 treatment. Circulating IL-9 levels were significantly increased in patients with the hypertension group than in the control group, and elevated IL-9 levels positively correlated with both systolic blood pressure and diastolic blood pressure in patients with hypertension. Conclusions. IL-9 KO alleviates inflammatory response, prevents phenotypic transformation of smooth muscle, reduces vascular dysfunction, and lowers blood pressure via the STAT3 pathway in Ang II-infused mice. IL-9 might be a novel target for the treatment and prevention of clinical hypertension.

SM22α inhibits lamellipodium formation and migration via Ras-Arp2/3 signaling in synthetic VSMCs

2016 ◽  
Vol 311 (5) ◽  
pp. C758-C767 ◽  
Author(s):  
Pin Lv ◽  
Fan Zhang ◽  
Ya-Juan Yin ◽  
Yu-Can Wang ◽  
Min Gao ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Vascular Lesion ◽  
Flavonoid Compound ◽  
Cell Cortex ◽  
Dependent Manner ◽  
Nucleotide Exchange ◽  
Migration Activity ◽  
And Migration

We previously demonstrated that smooth muscle (SM) 22α promotes the migration activity in contractile vascular smooth muscle cells (VSMCs). Based on the varied functions exhibited by SM22α in different VSMC phenotypes, we investigated the effect of SM22α on VSMC migration under pathological conditions. The results demonstrated that SM22α overexpression in synthetic VSMCs inhibited platelet-derived growth factor (PDGF)-BB-induced cell lamellipodium formation and migration, which was different from its action in contractile cells. The results indicated two distinct mechanisms underlying inhibition of lamellipodium formation by SM22α, increased actin dynamic stability and decreased Ras activity via interference with interactions between Ras and guanine nucleotide exchange factor. The former inhibited actin cytoskeleton rearrangement in the cell cortex, while the latter significantly disrupted actin nucleation activation of the Arp2/3 complex. Baicalin, a herb-derived flavonoid compound, inhibited VSMC migration via upregulation of SM22α expression in vitro and in vivo. These data suggest that SM22α regulates lamellipodium formation and cell migration in a phenotype-dependent manner in VSMCs, which may be a new therapeutic target for vascular lesion formation.

scholarly journals In vitro characterization of native mammalian smooth-muscle protein synaptopodin 2

2008 ◽  
Vol 28 (4) ◽  
pp. 195-203 ◽  
Author(s):  
Mechthild M. Schroeter ◽  
Brent Beall ◽  
Hans W. Heid ◽  
Joseph M. Chalovich
Keyword(s):  
Smooth Muscle ◽  
Muscle Protein ◽  
Actin Binding ◽  
Dependent Manner ◽  
In Vitro Characterization ◽  
Purification Scheme ◽  
Synaptopodin 2 ◽  
Muscle Myosin

An analysis of the primary structure of the actin-binding protein fesselin revealed it to be the avian homologue of mammalian synaptopodin 2 [Schroeter, Beall, Heid, and Chalovich (2008) Biochem. Biophys. Res. Commun. 371, 582–586]. We isolated two synaptopodin 2 isoforms from rabbit stomach that corresponded to known types of human synaptopodin 2. The purification scheme used was that developed for avian fesselin. These synaptopodin 2 forms shared several key functions with fesselin. Both avian fesselin and mammalian synaptopodin 2 bound to Ca2+–calmodulin, α-actinin and smooth-muscle myosin. In addition, both proteins stimulated the polymerization of actin in a Ca2+–calmodulin-dependent manner. Synaptopodin 2 has never before been shown to polymerize actin in the absence of α-actinin, to polymerize actin in a Ca2+–calmodulin-dependent manner, or to bind to Ca2+–calmodulin or myosin. These properties are consistent with the proposed function of synaptopodin 2 in organizing the cytoskeleton.

scholarly journals LncRNA-SMILR modulates RhoA/ROCK signaling by targeting miR-141 to regulate vascular remodeling in pulmonary arterial hypertension

2020 ◽  
Vol 319 (2) ◽  
pp. H377-H391 ◽  
Author(s):  
Si Lei ◽  
Fei Peng ◽  
Mei-Lei Li ◽  
Wen-Bing Duan ◽  
Cai-Qin Peng ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Long Noncoding Rna ◽  
Vascular Remodeling ◽  
Noncoding Rna ◽  
In Vivo Models ◽  
Pulmonary Arterial

Smooth muscle-enriched long noncoding RNA (SMILR), as a long noncoding RNA (lncRNA), was increased in pulmonary arterial hypertension (PAH) patients and in vitro and in vivo models. SMILR activated RhoA/ROCK signaling by targeting miR-141 to disinhibit its downstream target RhoA. SMILR knockdown or miR-141 overexpression inhibited hypoxia-induced cell proliferation and migration via repressing RhoA/ROCK signaling in pulmonary arterial smooth muscle cells (PASMCs), which was confirmed in vivo experiments that knockdown of SMILR inhibited vascular remodeling and alleviated PAH in rats. SMILR may be a promising and novel therapeutic target for the treatment and drug development of PAH.

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