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IL-1ra delivered from poly(lactic-co-glycolic acid) microspheres attenuates IL-1β-mediated degradation of nucleus pulposus in vitro

Deborah J Gorth12, Robert L Mauck12, Joseph A Chiaro12, Bhavana Mohanraj1, Nader M Hebela2, George R Dodge12, Dawn M Elliott3 and Lachlan J Smith12*

Author Affiliations

1 Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, 424 Stemmler Hall, 3450 Hamilton Walk, Philadelphia, PA 19104, USA

2 Veterans Affairs Medical Center, 3900 Woodland Avenue, Philadelphia, PA 19104, USA

3 Department of Biomedical Engineering, College of Engineering, University of Delaware, 125 E Delaware Avenue, Newark, DE 19716, USA

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Arthritis Research & Therapy 2012, 14:R179  doi:10.1186/ar3932

Published: 3 August 2012

Additional files

Additional file 1:

Figure S1. Bioactivity equivalence between recombinant human (rh) IL-1ra and anakinra. NP cells were isolated as described in the methods, expanded to passage 2 and cultured in monolayer (high glucose DMEM, 10% FBS and 1% PSF) in 6-well plates (500,000 cells/well, n = 3 per condition). Twelve hours after plating, cells were treated for 24 hours with IL-1β (10 ng/ml) alone, IL-1β (10 ng/ml) + rhIL-1ra (100 ng/ml), or IL-1β + anakinra (100 ng/ml). Total RNA was extracted and INOS mRNA levels quantified via rt-PCR, normalized to GAPDH, and expressed as a ratio to untreated. For cells treated with IL-1β alone, INOS mRNA levels were significantly higher than untreated (p < 0.05, unpaired t-test). For cells co-treated with IL-1β and either rhIL1-ra or anakinra, INOS mRNA levels were not significantly different from untreated.; * p < 0.05 versus untreated; ◆ p < 0.05 versus IL-1β only treated.

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