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Circulating Interleukin-6 and CD16 positive monocytes increase following angioplasty of an arteriovenous fistula

Research output: Contribution to journalArticlepeer-review

Original languageEnglish
Article number1427
JournalScientific Reports
Volume12
Issue number1
Early online date26 Jan 2022
DOIs
Accepted/In press28 Dec 2021
E-pub ahead of print26 Jan 2022
PublishedDec 2022

Bibliographical note

Funding Information: This project (13/94/10) is funded by the Efficacy and Mechanism Evaluation (EME) Programme, an MRC and NIHR partnership. Additional support was from the National Institute for Health Research (NIHR) Biomedical Research Centre based at Guy’s and St Thomas’ NHS Foundation Trust and King’s College London. The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health. We are grateful to patients and colleagues at Guy’s and St Thomas’ NHS Foundation Trust, Royal Free London NHS Foundation Trust and Barts Health NHS Trust for providing samples and data. Publisher Copyright: © 2022, The Author(s).

King's Authors

Abstract

Arteriovenous fistulas are the ideal form of vascular access that allows provision of haemodialysis. Stenotic lesions caused by neointimal hyperplasia commonly occur resulting in patients requiring a fistuloplasty. This is effective but there is a high recurrence rate. We sought to investigate the effects of a fistuloplasty on monocyte populations. Blood samples were taken from patients before and after their fistuloplasty procedure. Samples were analysed using flow cytometry, ELISA and Luminex assays. Univariate cox regression was carried out to investigate associations with post fistuloplasty patency. At 1–2 days post fistuloplasty, the proportion of classical (CD14++CD16−) monocytes decreased (p < 0.001), whilst intermediate (CD14++CD16+) and non-classical (CD14+CD16+) monocytes increased (both p < 0.01) in a cohort of 20 patients. A time course study carried out in 5 patients showed that this was due to an increase in absolute numbers of non-classical and intermediate monocytes. Higher levels of non-classical monocytes pre-fistuloplasty were associated with an increased risk for patency loss (p < 0.05). We measured 41 soluble factors in plasma samples taken before a fistuloplasty in 54 patients, with paired post-fistuloplasty samples (1–2 days) available in 30 patients. After correcting for false discovery, the only factor with a significant change in level was IL-6 (P = 0.0003, q = 0.0124). In a further time-course study in 6 patients, peak level of IL-6 occurred 2–3 h post fistuloplasty. This study demonstrates that there is a systemic inflammatory response to the fistuloplasty procedure and that monocyte subsets and IL-6 may be important in the pathophysiology of restenosis.

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