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Title: The role of apelin in the pulmonary circulation
Author: Brash, Lauren
ISNI:       0000 0004 6347 3227
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 2017
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Background – Apelin agonism causes vasodilatation and increased cardiac contractility in humans and improves pulmonary arterial hypertension in animal models. We here aimed to determine the pulmonary haemodynamic effects of apelin in patients with pulmonary arterial hypertension (PAH) and to determine the effects of apelin on rat pulmonary artery fibroblasts in the lab. Methods and Results – In a double-blind randomized crossover study, 19 patients with PAH received intravenous (Pyr1)apelin-13 (10-100 nmol/min) and matched saline placebo during invasive right heart catheterization and measurement of pulmonary artery pressure, pulmonary artery wedge pressure, cardiac output. Acute (Pyr1)apelin-13 infusion caused a reduction in pulmonary vascular resistance (p=0.001), increased cardiac output (p < 0.0001) and an increase in stroke volume (p < 0.0001). Apelin also prevented the hypoxic hyperproliferation and migration of rat pulmonary artery fibroblasts and reduced the activity of p38 MAP kinase. Conclusions – Acute intravenous (Pyr1)apelin infusion reduces pulmonary vascular resistance and increases cardiac output and stroke volume in patients with PAH. It also prevented fibroblast proliferation and migration and reduced the activity of the p38 MAP kinase pathway. Apelin agonism is an novel potential therapeutic target for the treatment of PAH and appears to improve both the haemodynamic consequences of pulmonary hypertension as well as potentially improving the remodelling seen in the pulmonary vasculature of patients with pulmonary hypertension.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (M.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Q Science (General) ; R Medicine (General)