Sahin, MehtapAydin, HuseyinAltun, AhmetDerin, Mehmet EminSahin, Ali2024-10-262024-10-2620202148-50461309-0283https://doi.org/10.46497/ArchRheumatol.2020.7568https://search.trdizin.gov.tr/tr/yayin/detay/364199https://hdl.handle.net/20.500.12418/27538Objectives: This study aims to investigate the effects of Janus kinase/signal transducers and activators of the transcription (JAK/STAT) pathway inhibition on collagen biosynthesis in fibroblast cell culture by tofacitinib. Materials and methods: BJ-CRL-1474 (R) (skin) and BRL3A (R) (hepatic) fibroblast cell cultures were proliferated in a suitable medium. Tofacitinib was administered to fibroblast cells proliferating in 96-well flasks at concentrations of 25, 50, 100, 200, 400, and 800 nM. Tissue inhibitor of metalloproteinase-1 (TIMP-1), matrix metalloproteinase-3 (MMP-3), transforming growth factor beta 1 (TGF-beta 1), and hydroxyproline levels were measured using the enzyme-linked immunosorbent assay method. Results: Tofacitinib showed cytotoxic effect on skin and liver cell culture. The cytotoxic effect of tofacitinib started at 100 nM (p<0.05). The highest effect was obtained at 800 nM. The time-dependent cytotoxic effect of tofacitinib was significantly higher at all concentrations after 72 hours than at 24 and 48 hours (p<0.05). The level of TGF-beta 1 was significantly lower even at a tofacitinib concentration of 25 nM (p<0.05). There were significant decreases in MMP-3, TIMP-1, and hydroxyproline levels after tofacitinib administration (p<0.05). Conclusion: Tofacitinib inhibited fibroblast cell proliferation in a concentration-dependent manner in a fibroblast cell culture. However, further extensive animal and human studies are necessary to determine the clinical significance of this effect.en10.46497/ArchRheumatol.2020.7568info:eu-repo/semantics/openAccessCollagenfibroblast cell cultureJanus kinase/signal transducers and activators of the transcriptiontofacitinibArticle353350343334586572-s2.0-85091723411Q4364199WOS:000574427300004Q4