Right ventricular (RV) failure is by far the most common cause of death in patients with pulmonary arterial hypertension (PAH). At present, little is known of the mechanisms contributing to RV failure in the setting of PAH. It is increasingly appreciated that it is not due simply to distal pulmonary microvascular disease and high pulmonary vascular resistance but rather to complex interactions between the pulmonary circulation and the RV. Inflammation is known to contribute significantly to changes in vascular remodeling in both large and small vessels as well as to RV dysfunction, especially in scleroderma associated PAH (SSc-PAH). Circulating mononuclear-fibrogenic cells have been implicated in inflammation, vascular remodeling, and RV dysfunction by our group and others. We have shown that fibroblasts in PAH patients and in animal models acquire an activated and epigenetically altered phenotype that is capable of generating a microenvironment, which promotes recruitment and activation of circulating mononuclear fibrogenic cells and that these cells contribute directly to tissue fibrosis and cardiac dysfunction. Our proposal will directly examine the mechanisms involved in fibroblast directed recruitment and activation of mononuclear fibrogenic cells and ultimately the role of these cells in driving abnormalities of large and small vessels, RV function and ultimately RV failure. Studies will be conducted in patients and also in unique large animal models of disease that have great fidelity to the human condition. Further, because we have shown that histone modifications are involved in the epigenetic change in fibroblast phenotype and that histone deacetylase inhibitors (HDACi) can turn off inflammatory signaling by activated fibroblasts, we will pursue studies to determine whether isoform selective HDAC inhibition can reverse pre-existing pulmonary hypertension and cardiac dysfunction by reprogramming epigenetically imprinted pro-inflammatory fibroblasts in the vasculature and right ventricle. Our proposal involves a multi- disciplinary approach with Principal Investigators with expertise in clinical pulmonary hypertension, in molecular cardiology, and in cell and molecular biology of fibroblasts and circulating mononuclear cells. Collectively, work by this interdisciplinary group will provide insight into abnormalities of RV-pulmonary arterial interactions in the setting of severe pulmonary hypertension and will lay the groundwork for potential new therapies.
The most common cause of death in patients with pulmonary hypertension is failure of the right side of the heart. Much remains to be learned about why the right heart fails in pulmonary hypertension especially because current therapies are not particularly effective in improving right heart function. We are proposing studies in humans and animals to better understand why the right heart fails and to evaluate the potential for a novel drug therapy beginning with testing in animals.
|Lapel, Martin; Weston, Philip; Strassheim, Derek et al. (2017) Glycolysis and oxidative phosphorylation are essential for purinergic receptor-mediated angiogenic responses in vasa vasorum endothelial cells. Am J Physiol Cell Physiol 312:C56-C70|
|Loomis, Zoe; Eigenberger, Paul; Redinius, Katherine et al. (2017) Correction: Hemoglobin induced cell trauma indirectly influences endothelial TLR9 activity resulting in pulmonary vascular smooth muscle cell activation. PLoS One 12:e0173652|
|Murakami, A; Wang, L; Kalhorn, S et al. (2017) Context-dependent role for chromatin remodeling component PBRM1/BAF180 in clear cell renal cell carcinoma. Oncogenesis 6:e287|
|Mouradian, Gary C; Gaurav, Rohit; Pugliese, Steve et al. (2017) Superoxide Dismutase 3 R213G Single-Nucleotide Polymorphism Blocks Murine Bleomycin-Induced Fibrosis and Promotes Resolution of Inflammation. Am J Respir Cell Mol Biol 56:362-371|
|Rashid, Jahidur; Patel, Brijeshkumar; Nozik-Grayck, Eva et al. (2017) Inhaled sildenafil as an alternative to oral sildenafil in the treatment of pulmonary arterial hypertension (PAH). J Control Release 250:96-106|
|Yuan, Jason X J; Morrell, Nicholas W; Stenmark, Kurt R et al. (2016) Our readership grows by leaps and bounds. Pulm Circ 6:405-406|
|Nozik-Grayck, Eva; Woods, Crystal; Stearman, Robert S et al. (2016) Histone deacetylation contributes to low extracellular superoxide dismutase expression in human idiopathic pulmonary arterial hypertension. Am J Physiol Lung Cell Mol Physiol 311:L124-34|
|Bartels, Karsten; Brown, R Dale; Fox, Daniel L et al. (2016) Right Ventricular Longitudinal Strain Is Depressed in a Bovine Model of Pulmonary Hypertension. Anesth Analg 122:1280-6|
|Li, Min; Riddle, Suzette; Zhang, Hui et al. (2016) Metabolic Reprogramming Regulates the Proliferative and Inflammatory Phenotype of Adventitial Fibroblasts in Pulmonary Hypertension Through the Transcriptional Corepressor C-Terminal Binding Protein-1. Circulation 134:1105-1121|
|Stenmark, Kurt R; Frid, Maria; Perros, Frédéric (2016) Endothelial-to-Mesenchymal Transition: An Evolving Paradigm and a Promising Therapeutic Target in PAH. Circulation 133:1734-7|
Showing the most recent 10 out of 71 publications