PMID: 9429906Jan 16, 1998Paper

Antiinflammatory effect of lipocortin 1 in experimental arthritis

Inflammation
Y H YangE F Morand

Abstract

The glucocorticoid-induced antiinflammatory protein lipocortin 1 is present in arthritic synovium but its ability to regulate joint inflammation has not previously been studied. We investigated the role of lipocortin 1 in the antiinflammatory activity of glucocorticoids in an acute arthritis model induced by intraarticular injection of carrageenan. Compared to control joints (0.09 +/- 0.08 x 10(6) synovial fluid cell count), carrageenan injected joints exhibited marked infiltration of PMN (10.2 +/- 0.7 x 10(6), p < 0.001). Both intraperitoneal (1.0 mg/kg) and intraarticular administration (5 micrograms) of dexamethasone (DEX) significantly suppressed arthritis severity (p < 0.001 and 0.005, respectively), and the effects of DEX were significantly prevented by intra-articular injection of antilipocortin 1 mAb (p < 0.05). Carrageenan arthritis was also significantly inhibited by intraarticular administration of the N-terminal lipocortin 1 peptide Ac2-26 at doses of 1 or 2 mg/kg (p < 0.01). Intraarticular injection antilipocortin 1 mAb in the absence of DEX also significantly exacerbated arthritis severity (p < 0.005). In vitro treatment of PMN with DEX was associated with significant inhibition of phagocytosis (p < 0.005) and rea...Continue Reading

Citations

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