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Tetramethoxystilbene-loaded liposomes restore reactive-oxygen-species-mediated attenuation of dilator responses in rat aortic vessels Ex vivo

Zaabalawi, A, Astley, C, Renshall, L, Beards, F, Lightfoot, AP, Degens, H, Whitehead, D, Alexander, Y, Harris, LK and Azzawi, M (2019) Tetramethoxystilbene-loaded liposomes restore reactive-oxygen-species-mediated attenuation of dilator responses in rat aortic vessels Ex vivo. Molecules, 24 (23). ISSN 1420-3049

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The methylated analogue of the polyphenol resveratrol (RV), 2,3',4,5'-tetramethoxystilbene (TMS) displays potent antioxidant properties and is an effective cytochrome P450 (CYP) 1B1 inhibitor. The bioavailability of TMS is low. Therefore, the use of liposomes for the encapsulation of TMS is a promising delivery modality for enhanced uptake into tissues. We examined the effect of delivery of TMS in liposomes on the restoration of vasodilator responses of isolated aortic vessels after acute tension elevation ex vivo. Aortic vessels from young male Wistar rats were isolated, and endothelial-dependent (acetylcholine, ACh) and -independent (sodium nitroprusside, SNP) responses assessed. Acute tension elevation (1 h) significantly reduced ACh dilator responses, which were restored following incubation with superoxide dismutase or apocynin (an NADPH oxidase inhibitor). Incubation with TMS-loaded liposomes (mean diameter 157 ± 6 nm; PDI 0.097) significantly improved the attenuated dilator responses following tension elevation, which was sustained over a longer period (4 h) when compared to TMS solution. Endothelial denudation or co-incubation with L-NNA (Nω-nitro-l-arginine; nitric oxide synthase inhibitor) resulted in loss of dilator function. Our findings suggest that TMS-loaded liposomes can restore attenuated endothelial-dependent dilator responses induced by an oxidative environment by reducing NADPH-oxidase-derived ROS and potentiating the release of the vasodilator nitric oxide. TMS-loaded liposomes may be a promising therapeutic strategy to restore vasodilator function in vascular disease.

Item Type: Article
Uncontrolled Keywords: Aorta; Animals; Humans; Rats; Rats, Wistar; Reactive Oxygen Species; Stilbenes; Liposomes; Organ Culture Techniques; Vasodilation; Male; 2,3′,4,5′-tetramethoxystilbene; aorta; endothelium; liposomes; nitric oxide; oxidative stress; reactive oxygen species; vascular function; Animals; Aorta; Humans; Liposomes; Male; Organ Culture Techniques; Rats; Rats, Wistar; Reactive Oxygen Species; Stilbenes; Vasodilation; Organic Chemistry; 0304 Medicinal and Biomolecular Chemistry; 0305 Organic Chemistry; 0307 Theoretical and Computational Chemistry
Subjects: R Medicine > RM Therapeutics. Pharmacology
Divisions: Pharmacy & Biomolecular Sciences
Publisher: MDPI AG
SWORD Depositor: A Symplectic
Date Deposited: 13 May 2022 08:49
Last Modified: 13 May 2022 09:00
DOI or ID number: 10.3390/molecules24234360
URI: https://researchonline.ljmu.ac.uk/id/eprint/16838
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