We have identified three gene expression signatures in peripheral blood mononuclear cells (PBMC) from children with recent-onset polyarticular and oligoarticular juvenile idiopathic arthritis (JIA) that identify subsets of patients with apparent differences in pathobiology and clinical outcomes. These signatures include: 1) a """"""""Monocyte Signature"""""""" that is predominantly expressed by older (a6 years) patients with polyarthritis, and is associated with greater disease severity and more frequent treatment with anti-TNF biologies;2) a """"""""T Cell Signature"""""""" that is also predominantly expressed by older polyarthritis patients, contains genes that implicate T cell exposure to TGFp and other pro-apoptotic influences, is associated with chronically active arthritis, and is associated with increased expression of several putative genetic markers of JIA susceptibility {IGF1R, JMJD1C and PTPN2);and 3) a """"""""B Cell Signature"""""""" that is expressed by younger (<6 years) patients with either oligoarthritis or polyarthritis, and implicates similar pathology between these two JIA subtypes. Our over-arching hypothesis is that these PBMC signatures detect cells that have entered the circulation after being influenced by arthritic inflammatory milieus, and therefore reflect pathological activity at sites of arthritis. Specifically, we hypothesize that 1) the Monocyte Signature detects circulating monocytes that have participated in and/or responded to joint tissue damage;2) the T Cell Signature detects circulating T cells that have been exposed to endogenous mechanisms in arthritic joints that are aimed at suppressing joint inflammation, such as regulatory T cell activity;and 3) the B Cell Signature detects circulating B cells with abnormal activity in the context of the developing B cell repertoires in children under age 6. We will test these hypotheses in our Specific Aims: 1) Identify differences in isolated PBMC subsets that correspond to differential expression of total PBMC gene expression signatures, 2) assess relationships of PBMC gene expression signatures to synovial fluid pathology, and 3) identify gene expression biomarker surrogates of PBMC signatures in whole blood. In the long-term, we believe that improved understanding of pathobiology associated with these PBMC signatures will lead to novel molecular tools for assessing and predicting arthritis activity that will advance clinical management of oligoarticular and polyarticular JIA.

Public Health Relevance

We have identified differences in expression of sets of genes in blood cells among sub-groups of children with juvenile arthritis. These differences appear to reflect specific disease processes that are only active in subsets of patients. We further hypothesize that these sets of genes can be used as """"""""biomarkers"""""""" to assess arthritis activity in the present, and predict outcomes, such as response to particular medications, in the future, which ultimately will help improve the outcomes of children with juvenile arthritis.

National Institute of Health (NIH)
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Research Program Projects (P01)
Project #
Application #
Study Section
Special Emphasis Panel (ZAR1-HL)
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Cincinnati Children's Hospital Medical Center
United States
Zip Code
Langefeld, Carl D; Ainsworth, Hannah C; Cunninghame Graham, Deborah S et al. (2017) Transancestral mapping and genetic load in systemic lupus erythematosus. Nat Commun 8:16021
McIntosh, Laura A; Marion, Miranda C; Sudman, Marc et al. (2017) Genome-Wide Association Meta-Analysis Reveals Novel Juvenile Idiopathic Arthritis Susceptibility Loci. Arthritis Rheumatol 69:2222-2232
Hinks, A; Bowes, J; Cobb, J et al. (2017) Fine-mapping the MHC locus in juvenile idiopathic arthritis (JIA) reveals genetic heterogeneity corresponding to distinct adult inflammatory arthritic diseases. Ann Rheum Dis 76:765-772
Ombrello, Michael J; Arthur, Victoria L; Remmers, Elaine F et al. (2017) Genetic architecture distinguishes systemic juvenile idiopathic arthritis from other forms of juvenile idiopathic arthritis: clinical and therapeutic implications. Ann Rheum Dis 76:906-913
Schulert, Grant S; Fall, Ndate; Harley, John B et al. (2016) Monocyte MicroRNA Expression in Active Systemic Juvenile Idiopathic Arthritis Implicates MicroRNA-125a-5p in Polarized Monocyte Phenotypes. Arthritis Rheumatol 68:2300-13
Prahalad, Sampath; McCracken, Courtney E; Ponder, Lori A et al. (2016) Familial autoimmunity in the Childhood Arthritis and Rheumatology Research Alliance registry. Pediatr Rheumatol Online J 14:14
Grom, Alexei A; Horne, AnnaCarin; De Benedetti, Fabrizio (2016) Macrophage activation syndrome in the era of biologic therapy. Nat Rev Rheumatol 12:259-68
Clement, Cristina C; Moncrieffe, Halima; Lele, Aditi et al. (2016) Autoimmune response to transthyretin in juvenile idiopathic arthritis. JCI Insight 1:
Liu, Ke; Kurien, Biji T; Zimmerman, Sarah L et al. (2016) X Chromosome Dose and Sex Bias in Autoimmune Diseases: Increased Prevalence of 47,XXX in Systemic Lupus Erythematosus and Sjögren's Syndrome. Arthritis Rheumatol 68:1290-1300
Schulert, Grant S; Bove, Kevin; McMasters, Richard et al. (2015) 11-Month-Old Infant With Periodic Fevers, Recurrent Liver Dysfunction, and Perforin Gene Polymorphism. Arthritis Care Res (Hoboken) 67:1173-9

Showing the most recent 10 out of 50 publications