We have evaluated the possible involvement of TGF-beta in rheumatoid arthritis by assay of 16 cell-free synovial fluids for the presence of its active and "latent" forms. Evidence has been obtained for TGF-beta-like activity in synovial effusions by four criteria: (a) TGF-beta receptor competition, (b) soft-agar colony formation of AKR-2B and NRK-49F indicator cells, (c) immunological neutralization of the biological activity, and (d) biochemical activation of a latent form.
Active and latent forms of transforming growth factor beta activity in synovial effusions.
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R Fava, N Olsen, J Keski-Oja, H Moses, T Pincus; Active and latent forms of transforming growth factor beta activity in synovial effusions.. J Exp Med 1 January 1989; 169 (1): 291–296. doi: https://doi.org/10.1084/jem.169.1.291
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