Calcitonin Gene-Related Peptide Effects on Phenotype and IL-12 Production of Monocyte-Derived Dendritic Cells in Rheumatoid Arthritis Patients

Document Type: Original Article

Authors

1 Immunology Research Center, BuAli Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran

2 Rheumatic Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

3 Department of Immunology, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran

Abstract

Objective(s)
Recent studies on human indicate that the introduction of therapeutic use of tolerogenic dendritic cell (DC) for chronic inflammatory conditions is imminent. For the purpose of defining CGRP potency in tolerogenic DC production, we investigated the phenotype and IL-'2 production of DCs generated from the monocytes of rheumatoid arthritis (RA) patients in the presence of the calcitonin gene-related peptide (CGRP), as a multifunctional neuropeptide.
Materials and Methods
DCs were generated from isolated monocytes from four resistant and two early female RA patients using IL- 4, GM-CSF, and CGRP at concentrations of 0, ', and '00 nM. Then, the phenotype of neuropeptide-treated or untreated DCs was determined using flow cytometry and the IL-'2 production was measured by ELISA.
Results
Our study showed that, on the last day of the culture, at a concentration of ' nM CGRP, the mean fluorescence intensity (MFI) for CD80 increased ('4.'3%) and the MFIs for CD83, CD86, and HLA-DR decreased ('4.57%, 5.28%, and 6.88% respectively). Moreover, at '00 nM CGRP concentration, the MFI for CD80 increased (''.'0%) and the MFIs for CD83, CD86, and HLA-DR decreased (4.27%, '8.60%, and '9.75% respectively). In addition, our results indicated that the mean concentrations of IL-'2 produced at 0, ', and '00 nm CGRP concentrations measured '3.72±2.4', ''.0'±'.6', and 7±'.34 pg/ml respectively.
Conclusion
Decreased CD83, CD86, and HLA-DR expression and reduced IL-'2 production by CGRP were found in the RA patients' monocyte-derived DCs. CD83 is a well-defined DC activation marker. HLA-DR and CD86 are appropriate molecules for inducing an immune response. IL-'2 promotes cell-mediated immunity. Therefore we suggest that CGRP may be used as an inducer in the production of tolerogenic DCs.

Keywords


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