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Butyrate protects endothelial function through PPARδ/miR-181b signaling

Tian, Qinqin, Leung, Fung Ping, Chen, Francis M., Tian, Xiao Yu, Chen, Zhenyu, Tse, Gary, Ma, Shuangtao, Wong, Wing Tak (2021) Butyrate protects endothelial function through PPARδ/miR-181b signaling. Pharmacological Research, 169 . Article Number 105681. ISSN 1043-6618. (doi:10.1016/j.phrs.2021.105681) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:98741)

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Reports of the beneficial roles of butyrate in cardiovascular diseases, such as atherosclerosis and ischemic stroke, are becoming increasingly abundant. However, the mechanisms of its bioactivities remain largely unknown. In this study, we explored the effects of butyrate on endothelial dysfunction and its potential underlying mechanism. In our study, ApoE-/- mice were fed with high-fat diet (HFD) for ten weeks to produce atherosclerosis models and concurrently treated with or without sodium butyrate daily. Thoracic aortas were subsequently isolated from C57BL/6 wild-type (WT), PPARδ-/-, endothelial-specific PPARδ wild-type (EC-specific PPARδ WT) and endothelial-specific PPARδ knockout (EC-specific PPARδ KO) mice were stimulated with interleukin (IL)-1β with or without butyrate ex vivo. Our results demonstrated that butyrate treatment rescued the impaired endothelium-dependent relaxations (EDRs) in thoracic aortas of HFD-fed ApoE-/- mice. Butyrate also rescued impaired EDRs in IL-1β-treated thoracic aorta ring ex vivo. Global and endothelial-specific knockout of PPARδ eliminated the protective effects of butyrate against IL-1β-induced impairment to EDRs. Butyrate abolished IL-1β-induced reactive oxygen species (ROS) production in endothelial cells while the inhibitory effect was incapacitated by genetic deletion of PPARδ or pharmacological inhibition of PPARδ. IL-1β increased NADPH oxidase 2 (NOX2) mRNA and protein expressions in endothelial cells, which were prevented by butyrate treatment, and the effects of butyrate were blunted following pharmacological inhibition of PPARδ. Importantly, butyrate treatment upregulated the miR-181b expression in atherosclerotic aortas and IL-1β-treated endothelial cells. Moreover, transfection of endothelial cells with miR-181b inhibitor abolished the suppressive effects of butyrate on NOX2 expressions and ROS generation in endothelial cells. To conclude, butyrate prevents endothelial dysfunction in atherosclerosis by reducing endothelial NOX2 expression and ROS production via the PPARδ/miR-181b pathway.

Item Type: Article
DOI/Identification number: 10.1016/j.phrs.2021.105681
Subjects: R Medicine
Divisions: Divisions > Division of Natural Sciences > Kent and Medway Medical School
Depositing User: Manfred Gschwandtner
Date Deposited: 06 Dec 2022 10:42 UTC
Last Modified: 07 Dec 2022 11:40 UTC
Resource URI: (The current URI for this page, for reference purposes)

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