Prenatal treprostinil improves pulmonary arteriolar hypermuscularization in the rabbit model of congenital diaphragmatic hernia

Felix R. De Bie, Yannick Regin, Antoine Dubois, Marianna Scuglia, Tomohiro Arai, Ewout Muylle, David Basurto, Marius Regin, Siska Croubels, Marc Cherlet, Emily A. Partridge, Karel Allegaert, Francesca M. Russo, Jan A. Deprest*

*Corresponding author for this work

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Abstract

Congenital diaphragmatic hernia (CDH) is a congenital malformation characterized by pulmonary hypoplasia, pulmonary hypertension, and cardiac dysfunction. Pulmonary hypertension represents the major cause of neonatal mortality and morbidity. Prenatal diagnosis allows assessment of severity and selection of foetal surgery candidates. We have shown that treprostinil, a prostacyclin analogue with an anti-remodelling effect, attenuates the relative hypermuscularization of the pulmonary vasculature in rats with nitrofen-induced CDH. Here we confirm these observations in a large animal model of surgically-created CDH. In the rabbit model, subcutaneous maternal administration of treprostinil at 150 ng/kg/min consistently reached target foetal concentrations without demonstrable detrimental foetal or maternal adverse effects. In pups with CDH, prenatal treprostinil reduced pulmonary arteriolar proportional medial wall thickness and downregulated inflammation and myogenesis pathways. No effect on alveolar morphometry or lung mechanics was observed. These findings provide further support towards clinical translation of prenatal treprostinil for CDH.

Original languageEnglish
Article number115996
JournalBiomedicine and Pharmacotherapy
Volume170
DOIs
Publication statusPublished - Jan 2024

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