L-Arginine reduces downstream vascular contractility after flow-diverting device deployment: A preliminary study in a rabbit model

Author:

Ayers-Ringler Jennifer1ORCID,Kolumam Parameswaran Praveen2,Khashim Zenith3,Dai Daying2ORCID,Ding Yong-Hong2ORCID,Kallmes David F2ORCID,Kadirvel Ramanathan2ORCID

Affiliation:

1. Center for Individualized Medicine, Mayo Clinic Rochester, Rochester, MN, USA

2. Department of Radiology, Mayo Clinic Rochester, Rochester, MN, USA

3. Department of Physiology and Biomedical Engineering, Mayo Clinic Rochester, Rochester, MN, USA

Abstract

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.

Funder

National Institutes of Health

Publisher

SAGE Publications

Subject

Immunology

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