Changes in novel biomarkers of disease activity in juvenile and adult dermatomyositis are sensitive biomarkers of disease course.

Reed AM, Peterson E, Bilgic H, Ytterberg SR, Amin S, Hein MS, Crowson CS, Ernste F, Gillespie EB.
Journal   Arthritis Rheum.
Species  
Analytes Measured   I-TAC , IL-10 , IL-6 , IL-8 , IP-10 , MCP-1 , MIG , TNF-RI
Matrix Tested   Serum
Year   2012
Volume  
Page Numbers  
Application   Cytokines and Chemokines
Abstract
OBJECTIVE: Muscle enzyme levels are insensitive markers of disease activity in juvenile and adult dermatomyositis (DM), especially during the active treatment phase. To improve our ability to monitor DM disease activity longitudinally, especially in the presence of immune modulating agents, we prospectively evaluated whether IFN-dependent peripheral blood gene and chemokine signatures could serve as sensitive and responsive biomarkers for change in disease activity in adult and juvenile DM.

METHODS: Peripheral blood and clinical data were collected from 51 juvenile and adult DM subjects prospectively over 2 study visits. Disease activity measures, whole-blood type I IFN gene and chemokine score were collected. We also measured serum levels of other pro-inflammatory cytokines, including IL-6.

RESULTS: Changes in juvenile and adult DM global disease activity correlated positively and significantly with changes in the type I IFN gene score before (r=0.33, p=0.023) and IFN chemokine score before and after adjustment for medication use (r=0.53, p<0.001 and r=0.50, p=<0.001). Changes in muscle and extramuscular VAS subscales positively correlated with change in IFN gene and chemokine score (p=0.002). Serum levels of IL-6, IL-8 and TNFα were positively correlated with changes in global, muscle and extra-muscular VAS before and after adjustment for medications (p<0.05).

CONCLUSION: Our findings suggest that changes in type I IFN gene and chemokine scores as well as levels of IL-6, IL-8 and TNFα may serve as sensitive and responsive longitudinal biomarkers of change in disease activity in juvenile and adult DM, even in the presence of immunosuppressant use.

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