scholarly journals Rosiglitazone Attenuated Endothelin-1-Induced Vasoconstriction of Pulmonary Arteries in the Rat Model of Pulmonary Arterial Hypertension via Differential Regulation of ET-1 Receptors

PPAR Research ◽  
2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Yahan Liu ◽  
Xiao Yu Tian ◽  
Yu Huang ◽  
Nanping Wang
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Pulmonary Arteries ◽  
Progressive Increase ◽  
Differential Regulation ◽  
Peroxisome Proliferator ◽  
Sprague Dawley ◽  
Peroxisome Proliferator Activated Receptor ◽  
Sprague Dawley Rats ◽  
Pulmonary Arterial

Pulmonary arterial hypertension (PAH) is a fatal disease characterized by a progressive increase in pulmonary arterial pressure leading to right ventricular failure and death. Activation of the endothelin (ET)-1 system has been demonstrated in plasma and lung tissue of PAH patients as well as in animal models of PAH. Recently, peroxisome proliferator-activated receptorγ(PPARγ) agonists have been shown to ameliorate PAH. The present study aimed to investigate the mechanism for the antivasoconstrictive effects of rosiglitazone in response to ET-1 in PAH. Sprague-Dawley rats were exposed to chronic hypoxia (10% oxygen) for 3 weeks. Pulmonary arteries from PAH rats showed an enhanced vasoconstriction in response to ET-1. Treatment with PPARγagonist rosiglitazone (20 mg/kg per day) with oral gavage for 3 days attenuated the vasocontractive effect of ET-1. The effect of rosiglitazone was lost in the presence ofL-NAME, indicating a nitric oxide-dependent mechanism. Western blotting revealed that rosiglitazone increasedETBRbut decreasedETARlevel in pulmonary arteries from PAH rats.ETBRantagonist A192621 diminished the effect of rosiglitazone on ET-1-induced contraction. These results demonstrated that rosiglitazone attenuated ET-1-induced pulmonary vasoconstriction in PAH through differential regulation of the subtypes of ET-1 receptors and, thus, provided a new mechanism for the therapeutic use of PPARγagonists in PAH.

scholarly journals PGC-1αInduction in Pulmonary Arterial Hypertension

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Manuel Mata ◽  
Irene Sarrion ◽  
Lara Milian ◽  
Gustavo Juan ◽  
Mercedes Ramon ◽  
...  
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Pulmonary Arteries ◽  
Total Antioxidant Status ◽  
Peroxisome Proliferator ◽  
Mrna Levels ◽  
Peroxisome Proliferator Activated Receptor ◽  
Potential Biomarker ◽  
Pulmonary Arterial ◽  
Gpx Activity

Idiopathic Pulmonary arterial hypertension (IPAH) is characterized by the obstructive remodelling of pulmonary arteries, and a progressive elevation in pulmonary arterial pressure (PAP) with subsequent right-sided heart failure and dead. Hypoxia induces the expression of peroxisome proliferator activated receptorγcoactivator-1α(PGC-1α) which regulates oxidative metabolism and mitochondrial biogenesis. We have analysed the expression of PGC-1α, cytochrome C (CYTC), superoxide dismutase (SOD), the total antioxidant status (TAS) and the activity of glutathione peroxidase (GPX) in blood samples of IPAH patients. Expression of PGC-1αwas detected in IPAH patients but not in healthy volunteers. The mRNA levels of SOD were lower in IPAH patients compared to controls (3.93 ± 0.89 fold change). TAS and GPX activity were lower too in patients compared to healthy donors, (0.13 ± 0.027 versus 0.484 ± 0.048 mM and 56.034 ± 10.37 versus 165.46 ± 11.38 nmol/min/mL, resp.). We found a negative correlation between expression levels of PGC-1αand age, PAP and PVR, as well as a positive correlation with CI, PaO2, mRNA levels of CYTC and SOD, TAS and GPX activity. These results taken together are indicative of the possible role of PGC-1αas a potential biomarker of the progression of IPAH.

Abstract 15120: Nanoparticle-Mediated Delivery of Pitavastatin into Small Pulmonary Arteies by Intravenous Administration Attenuated the Progression of Already Established Monocrotaline-induced Pulmonary Arterial Hypertension in Rats

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Kenzo Ichimura ◽  
Tetsuya Matoba ◽  
Ryoji Nagahama ◽  
Kaku Nakano ◽  
Kenji Sunagawa ◽  
...  
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Pulmonary Artery ◽  
Arterial Hypertension ◽  
Intravenous Administration ◽  
Pulmonary Arteries ◽  
Intratracheal Instillation ◽  
Poly Lactic Acid ◽  
Bolus Administration ◽  
Sprague Dawley ◽  
Pulmonary Arterial

Background: Pulmonary arterial hypertension (PAH) is an intractable disease of small pulmonary artery in which multiple pathogenetic factors are involved. We have previously reported that poly(lactic acid/glycolic acid) (PLGA) nanoparticle (NP)-mediated targeting of pitavastatin into lungs by intratracheal instillation attenuated the development of PAH. In the present study we examined the effects of intravenous treatment with pitavastatin-NPs on the progression of already established PAH induced by monocrotaline (MCT). Methods and Results: Male Sprague-Dawley rats (200 to 230 g) were injected subcutaneously with 60 mg/kg MCT to induce PAH. At day 17 after MCT injection when PAH had been already established, animals were randomly divided into 4 groups, which treated with intravenous daily bolus administration of the following drugs for consecutive 4 days from 17 to 20 days after MCT injection; 1) vehicle, 2) FITC-NPs, 3) pitavastatin alone (1, 3, 10 or 30 mg/kg), or 4) pitavastatin-NPs (containing 1 or 3 mg/kg pitavastatin). Treatment with pitavastatin-NPs, but not with pitavastatin alone attenuated the progression of established PAH (Fig. A) associated with the reduction of inflammation and small pulmonary artery remodeling (stenosis and obstruction of pulmonary arterial branches) (Fig. B). In trace experiments, intravenous administration of FITC-NPs revealed the targeting of FITC-NPs into small pulmonary artery in rats with MCT-induced PAH, but not in normal animals. Importantly, in a separate protocol, treatment with pitavastatin-NPs improved the survival rate at day 35 (30% in pitavastatin-NP group vs. 61% in FITC-NP group, P<0.05 by Kaplan-Meier). Conclusion: A novel NP-mediated targeting of pitavastatin into small pulmonary arteries by intravenous administration attenuated the progression of established PAH and improved survival associated with anti-inflammatory and anti-remodeling effects in a rat model of MCT-induced PAH.

scholarly journals Echocardiography and Pulmonary Arterial Hypertension

2016 ◽  
Vol 68 (4) ◽  
Author(s):  
Eduardo Bossone ◽  
Rodolfo Citro ◽  
Alberto Ruggiero ◽  
Bettina Kuersten ◽  
Giovanni Gregorio ◽  
...  
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Structural Changes ◽  
Pulmonary Arteries ◽  
Progressive Increase ◽  
Accurate Estimate ◽  
Therapeutic Interventions ◽  
Wide Range ◽  
Advanced Stages ◽  
Pulmonary Arterial

Pulmonary Arterial Hypertension (PAH) is an heterogeneous condition brought on by a wide range of causes. It is characterized by structural changes in small pulmonary arteries, that produce a progressive increase in pulmonary artery pressure and pulmonary vascular resistance, ultimately leading to right ventricle failure and death. Given the non-specific nature of its early symptoms and signs, PAH is often diagnosed in its advanced stages. Along with a careful clinical assessment and an accurate electrocardiogram/Chest X-ray interpretation, echocardiography is an essential test in the evaluation of patient with PAH. In fact it not only provides an accurate estimate of pulmonary pressure at rest and during exercise, but may also help to exclude any secondary causes, predict the prognosis, monitor the efficacy of specific therapeutic interventions and detect the preclinical stage of the disease.

Effect of TSN3015 on the development of pulmonary arterial hypertension in male Sprague-Dawley rats

2019 ◽  
Vol 99 ◽  
pp. 106595
Author(s):  
Peter B. Senese ◽  
Kimberly Doherty ◽  
David Bullough ◽  
Vinicius Carreira ◽  
Michael Gralinski
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Sprague Dawley ◽  
Sprague Dawley Rats ◽  
Pulmonary Arterial

scholarly journals Prostanoid EP4 agonist L-902,688 activates PPARγ and attenuates pulmonary arterial hypertension

2018 ◽  
Vol 314 (3) ◽  
pp. L349-L359 ◽  
Author(s):  
Hsin-Hsien Li ◽  
Hsao-Hsun Hsu ◽  
Gwo-Jyh Chang ◽  
I-Chen Chen ◽  
Wan-Jing Ho ◽  
...  
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Vascular Remodeling ◽  
Peroxisome Proliferator ◽  
Dependent Manner ◽  
Arterial Remodeling ◽  
Peroxisome Proliferator Activated Receptor ◽  
Pulmonary Arterial ◽  
And Migration ◽  
Pparγ Expression

Prostacyclin agonists that bind the prostacyclin receptor (IP) to stimulate cAMP synthesis are effective vasodilators for the treatment of idiopathic pulmonary arterial hypertension (IPAH), but this signaling may occur through nuclear peroxisome proliferator-activated receptor-γ (PPARγ). There is evidence of scant IP and PPARγ expression but stable prostanoid EP4 receptor (EP4) expression in IPAH patients. Both IP and EP4 functionally couple with stimulatory G protein (Gs), which activates signal transduction. We investigated the effect of an EP4-specific agonist on pulmonary arterial remodeling and its regulatory mechanisms in pulmonary arterial smooth muscle cells (PASMCs). Immunoblotting evealed IP, EP4, and PPARγ expression in human pulmonary arterial hypertension (PAH) and monocrotaline (MCT)-induced PAH rat lung tissue. Isolated PASMCs from MCT-induced PAH rats (MCT-PASMCs) were treated with L-902,688, a selective EP4 agonist, to investigate the anti-vascular remodeling effect. Scant expression of IP and PPARγ but stable expression of EP4 was observed in IPAH patient lung tissues and MCT-PASMCs. L-902,688 inhibited IP-insufficient MCT-PASMC proliferation and migration by activating PPARγ in a time- and dose-dependent manner, but these effects were reversed by AH-23848 (an EP4 antagonist) and H-89 [a protein kinase A (PKA) inhibitor], highlighting the crucial role of PPARγ in the activity of this EP4 agonist. L-902,688 attenuated pulmonary arterial remodeling in hypoxic PAH mice and MCT-induced PAH rats; therefore, we conclude that the selective EP4 agonist L-902,688 reverses vascular remodeling by activating PPARγ. This study identified a novel EP4-PKA-PPARγ pathway, and we propose EP4 as a potential therapeutic target for PAH.

scholarly journals Survival of patients with pulmonary arterial hypertension during therapy PAH-specific drugs

2017 ◽  
Vol 14 (3) ◽  
pp. 58-64
Author(s):  
D Yu Platonov ◽  
N A Tsareva ◽  
S N Avdeev
Keyword(s):  
Clinical Trials ◽  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Patient Survival ◽  
Morphological Changes ◽  
Pulmonary Arteries ◽  
Progressive Increase ◽  
Functional Disorders ◽  
Life Threatening ◽  
Pulmonary Arterial

Pulmonary arterial hypertension (PAH) is a life threatening syndrome, which is characterized by a progressive increase in pulmonary vascular resistance (PVR), medium pulmonary artery pressure and functional disorders and morphological changes of pulmonary arteries. Despite the relative abundance of PAH-specific drugs, the choice of a suitable agent for the treatment of a particular patient remains challenging. One of the most important parameters measured in clinical studies is patient survival or, in some cases, mortality. Survival or mortality as secondary or components of the primary endpoint one way or another has been studied in clinical trials of drugs for the treatment of PAH. For tablets drugs for the treatment of some forms of PAH (sildenafil, riociguat, bosentan, macitentan, ambrisentan) currently available data studies, which studied the survival.

scholarly journals Cathepsin S promotes the development of pulmonary arterial hypertension

2019 ◽  
Vol 317 (1) ◽  
pp. L1-L13 ◽  
Author(s):  
Chi-Jen Chang ◽  
Hsiu-Chi Hsu ◽  
Wan-Jing Ho ◽  
Gwo-Jyh Chang ◽  
Jong-Hwei S. Pang ◽  
...  
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Vascular Remodeling ◽  
Elastic Fibers ◽  
Cathepsin S ◽  
Peroxisome Proliferator ◽  
Peroxisome Proliferator Activated Receptor ◽  
Pulmonary Vascular Remodeling ◽  
Cathepsin Proteases ◽  
Pulmonary Arterial

Cysteine cathepsin proteases play critical roles in cardiovascular disease progression and are implicated in extracellular matrix (ECM) degradation. Patients with pulmonary arterial hypertension (PAH) exhibit increased elastase production by pulmonary arterial smooth muscle cells (PASMCs), which is related to the degradation of elastic fibers and pulmonary vascular remodeling. However, the mechanism by which cathepsins regulate the ECM and PASMC proliferation in PAH remains unclear. We hypothesized that cathepsin proteases in PASMCs promote the development of PAH. Here, we show overexpression of cathepsin S (Cat S) and degradation of elastic laminae in the lungs of patients with idiopathic PAH and in the PASMCs of monocrotaline-induced PAH model (MCT-PAH) rats. In addition, pulmonary hypertension can be treated in MCT-PAH rats by administering a selective Cat S inhibitor, Millipore-219393, which stimulates peroxisome proliferator-activated receptor-γ (PPARγ) to inhibit the expression of Cat S, thus suppressing the proliferation and migration of MCT-PAH PASMCs. We then reduced Cat S or PPARγ expression by using small interfering RNA in human PASMCs to demonstrate a mechanistic link between Cat S signaling and PPARγ protein, and the results suggest that PPARγ is upstream of Cat S signaling. In conclusion, the activity of Cat S in pulmonary vascular remodeling and degradation of elastin fibers through the disruption of PPARγ is pathophysiologically significant in PAH.

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