L-Arginine reduces downstream vascular contractility after flow-diverting device deployment: A preliminary study in a rabbit model
| Autor: | Yong Hong Ding, Praveen Kolumam Parameswaran, Daying Dai, David F. Kallmes, Jennifer R. Ayers-Ringler, Zenith Khashim, Ramanathan Kadirvel |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Vascular smooth muscle Arginine 030204 cardiovascular system & hematology Nitric oxide 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Internal medicine medicine Animals Humans Effective treatment Aorta Vascular contractility business.industry Intracranial Aneurysm Original Articles chemistry Hemorrhagic complication Rabbit model Cardiology Rabbits business 030217 neurology & neurosurgery |
| Zdroj: | Interv Neuroradiol |
| ISSN: | 2385-2011 1591-0199 |
| DOI: | 10.1177/15910199211025107 |
| Popis: | Background Flow diverters (FDs) are an effective treatment for intracranial aneurysms, though not free from hemorrhagic complications. A previous study demonstrated increased vascular contractility after FD-implantation as a potential mechanism of distal complications. Our study aimed to investigate whether L-arginine medication affects vascular contractility following FD deployment in a rabbit model. Methods FDs were implanted in the aorta of normal rabbits (+FD, n = 10), with sham-operated aorta as controls (n = 5). L-Arginine was given in the drinking water (2.25% L-arginine hydrochloride) of half of the +FD animals (+FD/+Arg). Force contraction vascular contractility studies were performed on the aortic rings proximal and distal to the FD using an organ bath. Total eNOS, eNOS(pS1177), eNOS(pT495), COX-2, and S100A4 were quantified by western analysis on total protein lysates from aortic segments, normalizing to GAPDH. Results Mean vascular contractility was 53% higher in distal relative to proximal aortic segments (P = 0.0038) in +FD animals, but were not significantly different in +FD/+Arg animals, or in sham-operated controls. The +FD animals expressed significantly reduced levels of eNOS(pS1177) than sham-operated controls (P = 0.0335), while both the +FD and +FD/+Arg groups had reduced levels of eNOS(pT495) relative to sham-operated controls (P = 0.0331 and P = 0.0311, respectively). Conclusion These results suggest that L-arginine medication reduces distal vascular contractility after FD treatment via nitric oxide production and thus might mitigate risk for downstream complications. |
| Databáze: | OpenAIRE |
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