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Neutralizing effects of anti-infliximab antibodies on synergistically-stimulated human coronary artery endothelial cells.

Authors
  • Ogrič, Manca1
  • Poljšak, Katjuša Mrak2
  • Lakota, Katja3
  • Žigon, Polona2
  • Praprotnik, Sonja2
  • Semrl, Snezna Sodin3
  • Čučnik, Saša4
  • 1 University Medical Centre Ljubljana, Department of Rheumatology, Ljubljana, Slovenia; University of Ljubljana, Faculty of Pharmacy, Chair of Clinical Biochemistry, Ljubljana, Slovenia. , (Slovenia)
  • 2 University Medical Centre Ljubljana, Department of Rheumatology, Ljubljana, Slovenia. , (Slovenia)
  • 3 University Medical Centre Ljubljana, Department of Rheumatology, Ljubljana, Slovenia; University of Primorska, FAMNIT, Koper, Slovenia. , (Slovenia)
  • 4 University Medical Centre Ljubljana, Department of Rheumatology, Ljubljana, Slovenia; University of Ljubljana, Faculty of Pharmacy, Chair of Clinical Biochemistry, Ljubljana, Slovenia. Electronic address: [email protected] , (Slovenia)
Type
Published Article
Journal
Atherosclerosis
Publication Date
Dec 01, 2019
Volume
291
Pages
1–8
Identifiers
DOI: 10.1016/j.atherosclerosis.2019.09.010
PMID: 31629987
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Patients with rheumatic diseases have an increased risk of atherosclerosis with up-regulated serum amyloid A (SAA), tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β), which were reported to activate human coronary artery endothelial cells (HCAEC). We aimed to investigate the effects of TNF-α inhibitor infliximab and anti-infliximab antibodies on the TNF-α/IL-1β/SAA activated HCAEC. HCAEC were incubated with TNF-α, IL-1β, SAA, infliximab, anti-infliximab antibodies and their combinations. The protein levels of pro- and anti-atherogenic analytes were measured in supernatants using ELISA and multiplex assays, while mRNA expression was determined by RT-PCR. Anti-infliximab antibodies were purified from sera samples by affinity chromatography. IL-6, IL-8, GM-CSF and GRO-α were synergistically up-regulated in triple stimulation with TNF-α, IL-1β and SAA, while their levels in solely SAA- or TNF-α-stimulated HCAEC did not increase. IL-1Ra, IL-1α, VCAM-1, MCP-1, IL-10 and IL-17A were increased, but no synergistic responses were observed in triple stimulation. Infliximab was effective in lowering the synergistic effect of IL-6, IL-8, GM-CSF and GRO-α in triple stimulation, while anti-infliximab antibodies restored the levels. The changes were confirmed at the mRNA expression level for IL-6, IL-8 and GM-CSF. Triple stimulation with TNF-α, IL-1β and SAA synergistically elevated IL-6, IL-8, GM-CSF and GRO-α release in supernatants of HCAEC, with infliximab substantially inhibiting their levels. An isolated, enriched fraction of polyclonal anti-infliximab antibodies was capable of neutralizing infliximab, in the presence of TNF-α/IL-1β/SAA. The long-term presence of anti-infliximab antibodies in the circulation of patients with chronic rheumatic diseases is potentially important for promoting the atherosclerotic process. Copyright © 2019 Elsevier B.V. All rights reserved.

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