title: Aspirin and sodium salicylate inhibit proliferation and induce apoptosis in rheumatoid synovial cells.
abstract: Aspirin has been reported to induce apoptosis in a variety of cell lines. In this study, we examined whether aspirin and sodium salicylate inhibit cell growth and induce apoptosis in rheumatoid synovial cells. Synovial cells were obtained from patients with rheumatoid arthritis, and the cells were treated with aspirin or sodium salicylate (0.1-10 mM) for 24 h. Cell proliferation and viability were assessed by 5-bromo-2'-deoxyuridine incorporation and by 4-[3-(4-iodophenyl)-2-(4-nitrophenyl)-2H-5-tetrazolio]-1,3-benzene disulfonate (WST-1) assay, respectively. The apoptosis of synovial cells was identified by DNA fragmentation assay and terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNEL) assay. Aspirin and sodium salicylate suppressed the proliferation (IC50 (concentration causing 50% inhibition of cell proliferation): 2.1 and 1.2 mM, respectively) and reduced the viability (IC50: 2.0 and 1.4 mM, respectively) of synovial cells in a concentration-dependent manner at 0.3-10 mM. Furthermore, they induced DNA fragmentation and increased the number of TUNEL-positive synovial cells. These results suggest that aspirin and sodium salicylate can inhibit the proliferation of rheumatoid synovial cells through induction of apoptosis.
authors.affiliation: Institute of Medical Science, St Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki-shi, Kanagawa 216-8512, Japan.
authors.forename: Ryuta
authors.initials: R
authors.lastname: Yamazaki
authors.forename: Natsuko
authors.initials: N
authors.lastname: Kusunoki
authors.forename: Takeshi
authors.initials: T
authors.lastname: Matsuzaki
authors.forename: Shusuke
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kawai
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D017209:Apoptosis; D001172:Arthritis, Rheumatoid / Q000378:metabolism / Q000473:pathology*; D001241:Aspirin / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D053938:DNA Fragmentation; D004305:Dose-Response Relationship, Drug; D006801:Humans; D020287:In Situ Nick-End Labeling; D012980:Sodium Salicylate / Q000494:pharmacology*; D013583:Synovial Membrane / Q000187:drug effects* / Q000473:pathology
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001241:Aspirin; D012980:Sodium Salicylate