Abstract
We examined the functional activity of peripheral blood neutrophils and the complement system activation status in patients with rheumatoid arthritis (RA) undergoing infliximab/methotrexate combined therapy. We studied female RA patients under treatment with infliximab (3–5 mg/kg) and methotrexate (15–25 mg/week) who presented inactive (i-RA; n = 34, DAS-28 ≤ 2.6) or at least moderately active disease (a-RA; n = 29, DAS-28 > 3.2), and age-matched healthy women (n = 38). We measured the levels of reactive oxygen species (ROS) generation (chemiluminescence assay) and membrane expression of FcγRIIa/CD32, FcγRIIIb/CD16, CR1/CD35, and CR3/CD11b receptors (ELISA assay) in neutrophils. We also determined the hemolytic activity of the alternative and classical pathways of the complement system (spectrophotometry), serum levels of C5a and Bb (ELISA assay), and serum chemotactic activity (Boyden chamber). Compared with the control group, i-RA and a-RA patients exhibited: (1) increased neutrophil ROS production and membrane expression of FcγRIIa/CD32, FcγRIIIb/CD16, and CR1/CD35, indicating neutrophil activation; and (2) increased serum chemotactic activity and decreased activity of the alternative complement pathway, indicating systemic complement system activation. The levels of C-reactive protein in a-RA patients were augmented, compared with i-RA patients. Although infliximab/methotrexate combined therapy induced disease remission according to the DAS-28 criteria, both i-RA and a-RA patients still exhibited significant levels of systemic activation of neutrophils and the complement system.
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Abbreviations
- Anti-CCP:
-
Anti-cyclic citrullinated peptide antibody
- CHS:
-
Serum from healthy control subject
- CL:
-
Chemiluminescence
- CR:
-
Complement receptor
- CRP:
-
C-reactive protein
- DAS-28:
-
Disease activity score of 28 joints
- DMARD:
-
Disease-modifying anti-rheumatic drug
- EULAR:
-
European League against Rheumatism
- FcγR:
-
Fcγ receptors
- FITC:
-
Fluorescein isothiocyanate
- HA:
-
Hemolytic activity
- IC:
-
Immune complex
- IFM:
-
Infliximab
- MFI:
-
Median fluorescence intensity
- MTX:
-
Methotrexate
- PE:
-
Phycoerythrin
- RA:
-
Rheumatoid arthritis
- a-RA:
-
Active rheumatoid arthritis
- i-RA:
-
Inactive rheumatoid arthritis
- RAHS:
-
Serum from patient with rheumatoid arthritis
- ROS:
-
Reactive oxygen species
- TNF-α:
-
Tumor necrosis factor-α
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Acknowledgements
The authors are grateful to Dr. Ana Paula Landi Librandi, from the School of Pharmaceutical Sciences of Ribeirão Preto (Ribeirão Preto, SP, Brazil) for helping us to perform the ELISA assays, and to Mrs. Patricia Vianna Bonini Palma and Mrs. Camila Cristina O. M. Bonaldo from the Hemotherapy Center of Ribeirão Preto (FUNDHERP, Ribeirão Preto, SP, Brazil) for their helpful technical assistance in the flow cytometry analyses.
Funding
The Brazilian funding agencies São Paulo Research Foundation (FAPESP; Grants 2013/22331-5, and 2013/20810-7), the National Council for Scientific and Technological Development (CNPq; Grants 151665/2010-9, 308111/2013/3), and the Coordination for the Improvement of Higher Education Personnel (CAPES) provided the fellowships and financial support.
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Contributions
LFM and ABPP devised the project, designed the study, analyzed and interpreted the results, and drafted the manuscript. LFM conducted all the experiments. RDRO followed-up and selected the patients, and determined their clinical parameters. AECSA assisted in all the experiments, and in data processing and analysis. LMK assisted in statistical data analyses, and drafted and proofread the manuscript. EAD selected the patients and supervised the study. YMLV devised the project, searched for funding, and supervised the study. All authors discussed the results, and revised and approved the final version of the manuscript.
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The authors declare that they have no conflicts of interest.
Ethical approval
The Research Ethics Committee of the Ribeirão Preto Medical School Hospital of the University of São Paulo (HC-FMRP-USP, Ribeirão Preto, SP, Brazil) approved the study protocol (HCRP n. 10097/2002). All the procedures conducted in humans complied with Resolution 466/12 of the Brazilian National Health Council, which follows the recommendations of the 1964 Helsinki declaration and its later amendments.
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All the patients and healthy subjects signed the informed consent form to participate in this study.
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This study is part of the post-doctoral research project developed by Dr. Larissa Fávaro Marchi under supervision of Dr. Yara Maria Lucisano-Valim, at School of Pharmaceutical Sciences of Ribeirão Preto. The present institutional address of Dr. Marchi is: Faculdades Integradas Padre Albino, FIPA, Rua dos Estudantes 225, Catanduva, SP, 15809-144 Brazil.
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Marchi, L.F., Paoliello-Paschoalato, A.B., Oliveira, R.D.R. et al. Activation status of peripheral blood neutrophils and the complement system in adult rheumatoid arthritis patients undergoing combined therapy with infliximab and methotrexate. Rheumatol Int 38, 1043–1052 (2018). https://doi.org/10.1007/s00296-018-3997-1
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DOI: https://doi.org/10.1007/s00296-018-3997-1