Macrophage release of transforming growth factor beta1 during resolution of monosodium urate monohydrate crystal-induced inflammation

Arthritis and Rheumatism
D R YagnikD O Haskard

Abstract

It has previously been shown that as monocytes differentiate into macrophages, they lose the ability to secrete proinflammatory cytokines in response to monosodium urate monohydrate (MSU) crystals. The purpose of this study was to investigate whether MSU crystals induce macrophages to secrete antiinflammatory factor instead. Human monocyte or macrophage isolates were prepared from samples obtained from healthy volunteer donors either by differentiation of blood monocytes in vitro or by collecting cells from skin blisters during the early or late phase of the dermal inflammatory response to cantharidin. Monocyte or macrophage isolates were then incubated with MSU crystals for 24 hours, and culture supernatants were assayed for candidate antiinflammatory mediators (by enzyme-linked immunosorbent assay) and for the capacity to activate or suppress endothelial cell E-selectin expression and secondary neutrophil recruitment under shear flow. Analysis of supernatants from in vitro-differentiated macrophages revealed that transforming growth factor beta1 (TGFbeta1) was induced following MSU crystal stimulation (mean +/- SEM 1.50 +/- 0.24 ng/ml/10(6) cells), but there was no evidence of interleukin-10 (IL-10), IL-1 receptor antagonist,...Continue Reading

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