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  Epoxyeicosatrienoic Acid and Prostanoid Crosstalk at the Receptor and Intracellular Signaling Levels to Maintain Vascular Tone

Malacarne, P. F., Bezzenberger, J., Lopez, M., Warwick, T., Mueller, N., Brandes, R. P., et al. (2022). Epoxyeicosatrienoic Acid and Prostanoid Crosstalk at the Receptor and Intracellular Signaling Levels to Maintain Vascular Tone. INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 23(11): 5939. doi:10.3390/ijms23115939.

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 Creators:
Malacarne, Pedro Felipe, Author
Bezzenberger, Justus, Author
Lopez, Melina1, Author              
Warwick, Timothy1, Author              
Mueller, Niklas, Author
Brandes, Ralf P., Author
Rezende, Flavia, Author
Affiliations:
1IMPRS, Max Planck Institute for Heart and Lung Research, Max Planck Society, ou_3242057              

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 Abstract: Epoxyeicosatrienoic acids (EETs) are signaling lipids produced by the cytochrome P450-(CYP450)-mediated epoxygenation of arachidonic acid. EETs have numerous biological effects on the vascular system, but aspects including their species specificity make their effects on vascular tone controversial. CYP450 enzymes require the 450-reductase (POR) for their activity. We set out to determine the contribution of endothelial CYP450 to murine vascular function using isolated aortic ring preparations from tamoxifen-inducible endothelial cell-specific POR knockout mice (ecPOR(-/-)). Constrictor responses to phenylephrine were similar between control (CTR) and ecPOR(-/-) mice. Contrastingly, sensitivity to the thromboxane receptor agonist U46619 and prostaglandin E2 (PGE2) was increased following the deletion of POR. Ex vivo incubation with a non-hydrolyzable EET (14,15-EE-8(Z)-E, EEZE) reversed the increased sensitivity to U46619 to the levels of CTR. EETs had no effect on vascular tone in phenylephrine-preconstricted vessels, but dilated vessels contracted with U46619 or PGE2. As U46619 acts through RhoA-dependent kinase, this system was analyzed. The deletion of POR affected the expression of genes in this pathway and the inhibition of Rho-GTPase with SAR407899 decreased sensitivity to U46619. These data suggest that EET and prostanoid crosstalk at the receptor level and that lack of EET production sensitizes vessels to vasoconstriction via the induction of the Rho kinase system.

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 Dates: 2022-05-25
 Publication Status: Published online
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 Identifiers: ISI: 000808729800001
DOI: 10.3390/ijms23115939
PMID: 35682616
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Title: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Source Genre: Journal
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Pages: - Volume / Issue: 23 (11) Sequence Number: 5939 Start / End Page: - Identifier: -