Direct delivery of microRNA96 to the lungs reduces progression of sugen/hypoxia-induced pulmonary hypertension in the rat

Docherty, Craig K. and Denver, Nina and Fisher, Simon and Nilsen, Margaret and Hillyard, Dianne and Openshaw, Rebecca L. and Labazi, Hicham and MacLean, Margaret R. (2020) Direct delivery of microRNA96 to the lungs reduces progression of sugen/hypoxia-induced pulmonary hypertension in the rat. Molecular Therapy - Nucleic Acids, 22. pp. 396-405. ISSN 2162-2531 (https://doi.org/10.1016/j.omtn.2020.09.002)

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Abstract

The 5HT1B receptor (5HT1BR) contributes to the pathogenic effects of serotonin in pulmonary arterial hypertension. Here, we determine the effect of a microRNA96 (miR96) mimic delivered directly to the lungs on development of severe pulmonary hypertension in rats. Female rats were dosed with sugen (30 mg/kg) and subjected to 3 weeks of hypobaric hypoxia. In normoxia, rats were dosed with either a 5HT1BR antagonist SB216641 (7.5 mg/kg/day for 3 weeks), miR96, or scramble sequence (50 μg per rat), delivered by intratracheal (i.t) administration, once a week for 3 weeks. Cardiac hemodynamics were determined, pulmonary vascular remodeling was assessed, and gene expression was assessed by qRT-PCR, and in situ hybridization and protein expression were assessed by western blot and ELISA. miR96 expression was increased in pulmonary arteries and associated with a downregulation of the 5HT1BR protein in the lung. miR96 reduced progression of right ventricular systolic pressure, pulmonary arterial remodeling, right ventricular hypertrophy, and the occurrence of occlusive pulmonary lesions. Importantly, miR96 had no off-target effects and did not affect fibrotic markers of liver and kidney function. In conclusion, direct delivery of miR96 to the lungs was effective, reducing progression of sugen/hypoxia-induced pulmonary hypertension with no measured off-target effects. miR96 may be a novel therapy for pulmonary arterial hypertension, acting through downregulation of 5HT1BR.

  • Item type:Article
    ID code:75323
    Dates:
    Date
    Event
    4 December 2020
    Published
    5 September 2020
    Published Online
    2 September 2020
    Accepted
    Keywords:pulmonary hypertension, serotonin, microRNA96, Internal medicine, Molecular Medicine
    Subjects:Medicine > Internal medicine
    Department:Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
    Depositing user: Pure Administrator
    Date deposited:04 Feb 2021 15:54
    Last modified:14 Nov 2021 02:20
    URI:https://strathprints.strath.ac.uk/id/eprint/75323
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