Holmboe, S;
Andersen, A;
Johnsen, J;
Nielsen, JM;
Nørregaard, R;
Bøtker, HE;
Clapp, LH;
(2017)
Inotropic Effects of Prostacyclins on the Right Ventricle Are Abolished in Isolated Rat Hearts With Right-Ventricular Hypertrophy and Failure.
Journal of Cardiovascular Pharmacology
, 69
(1)
pp. 1-12.
10.1097/FJC.0000000000000435.
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Abstract
BACKGROUND: Prostacyclin mimetics are vasodilatory agents used in the treatment of pulmonary arterial hypertension. The direct effects of prostanoids on right-ventricular (RV) function are unknown. We aimed to investigate the direct effects of prostacyclin mimetics on RV function in hearts with and without RV hypertrophy and failure. METHODS: Wistar rats were subjected to pulmonary trunk banding to induce compensated RV hypertrophy (n = 32) or manifest RV failure (n = 32). Rats without banding served as healthy controls (n = 30). The hearts were excised and perfused in a Langendorff system and subjected to iloprost, treprostinil, epoprostenol, or MRE-269 in increasing concentrations. The effect on RV function was evaluated using a balloon-tipped catheter inserted into the right ventricle. RESULTS: In control hearts, iloprost, treprostinil, and MRE-269 improved RV function. The effect was, however, absent in hearts with RV hypertrophy and failure. Treprostinil and MRE-269 even impaired RV function in hearts with manifest RV failure. CONCLUSIONS: Iloprost, treprostinil, and MRE-269 improved RV function in the healthy rat heart. RV hypertrophy abolished the positive inotropic effect, and in the failing right ventricle, MRE-269 and treprostinil impaired RV function. This may be related to changes in prostanoid receptor expression and reduced coronary flow reserve in the hypertrophic and failing right ventricle.
| Type: | Article |
|---|---|
| Title: | Inotropic Effects of Prostacyclins on the Right Ventricle Are Abolished in Isolated Rat Hearts With Right-Ventricular Hypertrophy and Failure |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1097/FJC.0000000000000435 |
| Publisher version: | http://dx.doi.org/10.1097/FJC.0000000000000435 |
| Language: | English |
| Additional information: | © 2017 Wolters Kluwer Health, Inc. All rights reserved. This is a non-final version of an article published in final form Holmboe, S; Andersen, A; Johnsen, J; Nielsen, JM; Nørregaard, R; Bøtker, HE; Clapp, LH; (2017) Inotropic Effects of Prostacyclins on the Right Ventricle Are Abolished in Isolated Rat Hearts With Right-Ventricular Hypertrophy and Failure. Journal of Cardiovascular Pharmacology , 69 (1) pp. 1-12. 10.1097/FJC.0000000000000435. |
| Keywords: | Prostacyclin, contractility, right-ventricular failure, prostanoid receptors, pulmonary arterial hypertension |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science > Pre-clinical and Fundamental Science |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1517858 |
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