The active metabolite of leflunomide, A77 1726, increases proliferation of human synovial fibroblasts in presence of IL-1β and TNF-α
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Objective and design
Excessive synovial fibroblast (SF) proliferation is detrimental in rheumatoid arthritis. We therefore sought to determine the effects of A77 1726, the active metabolite of leflunomide, on SF proliferation.
Human SFs were used. Cell proliferation was investigated using MTS assay, by 3H-thymidine incorporation and cell counts.
Whereas A77 1726 alone had no effects, it significantly increased the mitogenic effects of interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α). Cyclooxygenase inhibition might be at least partly involved, since indomethacin displayed similar effects, and since prostaglandin E2 inhibited SF proliferation. In contrast, the effect of A77 1726 did not appear to be mediated through depletion of the pyrimidine pool or inhibition of tyrosine kinases.
A77 1726 displays proliferative effects in presence of IL-1β and TNF-α. Further elucidation of involved mechanisms may prove useful for the utilization of leflunomide, the development of related compounds or elaboration of new therapeutic strategies.
- The active metabolite of leflunomide, A77 1726, increases proliferation of human synovial fibroblasts in presence of IL-1β and TNF-α
Volume 55, Issue 11 , pp 469-475
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- Rheumatoid arthritis
- Synovial fibroblast
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- Author Affiliations
- 1. Division of Rheumatology, University Hospital, Geneva, Switzerland
- 2. Department of Pathology and Immunology, University of Geneva School of Medicine, Geneva, Switzerland
- 3. Biomaterials and Biotechnologies, Boulogne/mer, France