Comparison of Blood and Synovial Fluid Th17 and Novel Peptidase Inhibitor 16 Treg Cell Subsets in Juvenile Idiopathic Arthritis

Early recognition and treatment of juvenile idiopathic arthritis (JIA) can prevent joint damage and minimize side effects of medication. The balance between proinflammatory and antiinflammatory mechanisms is known to be important in JIA, and we therefore investigated T cell subsets including Th cell...

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Bibliographic Details
Published in:	Journal of rheumatology Vol. 39; no. 10; pp. 2021 - 2031
Main Authors:	GROSE, Randall H, MILLARD, Deborah J, MAVRANGELOS, Chris, BARRY, Simon C, ZOLA, Heddy, NICHOLSON, Ian C, TARNG CHAM, Weng, BOROS, Christina A, KRUMBIEGEL, Doreen
Format:	Journal Article
Language:	English
Published:	Toronto, ON Journal of Rheumatology Publishing 01-10-2012
Subjects:	Adolescent Arthritis, Juvenile - immunology Arthritis, Juvenile - metabolism Biological and medical sciences Carrier Proteins - metabolism Child Child, Preschool Diseases of the osteoarticular system Female Glycoproteins - metabolism Humans Infant Inflammatory joint diseases Male Medical sciences Synovial Fluid - immunology Synovial Fluid - metabolism T-Lymphocyte Subsets - immunology T-Lymphocyte Subsets - metabolism T-Lymphocytes, Regulatory - immunology T-Lymphocytes, Regulatory - metabolism Th17 Cells - immunology Th17 Cells - metabolism Enzyme PEPTIDASE INHIBITOR 16 Diseases of the osteoarticular system Rheumatology JUVENILE IDIOPATHIC ARTHRITIS Juvenile rheumatoid arthritis Inflammatory joint disease Blood Synovial fluid Peptidases Chronic Th CELLS Hydrolases Comparative study
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Summary:	Early recognition and treatment of juvenile idiopathic arthritis (JIA) can prevent joint damage and minimize side effects of medication. The balance between proinflammatory and antiinflammatory mechanisms is known to be important in JIA, and we therefore investigated T cell subsets including Th cells, autoaggressive Th17 cells, and regulatory T cells (Treg), including a novel Treg subset in peripheral blood (PB) and synovial fluid (SF) of patients with JIA. Fifty children with JIA were enrolled in our study. Frequency, phenotype, and function of T lymphocytes in PB and SF were characterized using flow cytometry. Migration capabilities of PB and SF cells were compared. Synovial T cells showed different phenotype and function compared with PB T cells, with an increased proportion of memory T cells, expression of CCR4, CCR5, CXCR3, interleukin 23R, and an increased ratio of Th17 to Treg. Although Treg were increased in SF compared with the PB, we found a significant decrease in the numbers of peptidase inhibitor 16 (PI16)+ Treg in active joints compared with peripheral blood. Coexpression of CCR4 and CCR6 was reduced on PI16+ Treg in PB and SF of patients with JIA compared with healthy children, however the ability of these cells to migrate toward their ligands was unaffected. This is a comprehensive characterization of novel PI16+ Treg and Th17 cells in matched blood and synovial fluid samples of patients with JIA. Despite an increased number of Treg within the inflamed joint, lower numbers of PI16+ Treg but high numbers of Th17 cells might contribute to the inability to control disease.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0315-162X 1499-2752
DOI:	10.3899/jrheum.111421