201. PTPN14 phosphatase and YAP promote TGFβ signalling in rheumatoid synoviocytes
- Author
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Dennis J. Wu, Costantino Pitzalis, Deepa Hammaker, Yeesim Khew-Goodall, Nunzio Bottini, Michelle Le Roux, Maripat Corr, Gary S. Firestein, Cristiano Sacchetti, Angel Bottini, Beatrix Bartok, Ana Lonic, Stephanie M. Stanford, Myles Lewis, David L. Boyle, Michele Bombardieri, Karen M. Doody, Wei Wang, Rizi Ai, Martina Zoccheddu, Xiaochun Li, Vida Zhang, Tzu-Ching Meng, Lin Liu, Bottini, Angel, Wu, Dennis J., Ai, Rizi, Le Roux, Michelle, Lonic, Ana, Li, Xiaochun, Khew-Goodall, Yeesim, and Bottini, Nunzio
- Subjects
0301 basic medicine ,rheumatoid arthritis ,Arthritis ,Cell Cycle Proteins ,SMAD ,Protein tyrosine phosphatase ,K/BxN ,PTPN14 ,Arthritis, Rheumatoid ,Mice ,0302 clinical medicine ,Transforming Growth Factor beta ,Rheumatoid ,Immunology and Allergy ,2.1 Biological and endogenous factors ,Non-Receptor ,Aetiology ,skin and connective tissue diseases ,Gene knockdown ,Adaptor Proteins ,Protein Tyrosine Phosphatases, Non-Receptor ,musculoskeletal system ,Synoviocytes ,030220 oncology & carcinogenesis ,Public Health and Health Services ,Tumor necrosis factor alpha ,YAP ,Signal Transduction ,musculoskeletal diseases ,Clinical Sciences ,Immunology ,Autoimmune Disease ,Article ,General Biochemistry, Genetics and Molecular Biology ,03 medical and health sciences ,TGFβ ,Rheumatology ,medicine ,Genetics ,Animals ,Humans ,fibroblast-like synoviocytes ,Adaptor Proteins, Signal Transducing ,Hippo signaling pathway ,business.industry ,Inflammatory and immune system ,Signal Transducing ,Verteporfin ,YAP-Signaling Proteins ,medicine.disease ,Arthritis & Rheumatology ,030104 developmental biology ,Musculoskeletal ,Cancer cell ,Cancer research ,Protein Tyrosine Phosphatases ,business ,Transcription Factors - Abstract
ObjectiveWe aimed to understand the role of the tyrosine phosphatase PTPN14—which in cancer cells modulates the Hippo pathway by retaining YAP in the cytosol—in fibroblast-like synoviocytes (FLS) from patients with rheumatoid arthritis (RA).MethodsGene/protein expression levels were measured by quantitative PCR and/or Western blotting. Gene knockdown in RA FLS was achieved using antisense oligonucleotides. The interaction between PTPN14 and YAP was assessed by immunoprecipitation. The cellular localisation of YAP and SMAD3 was examined via immunofluorescence. SMAD reporter studies were carried out in HEK293T cells. The RA FLS/cartilage coimplantation and passive K/BxN models were used to examine the role of YAP in arthritis.ResultsRA FLS displayed overexpression of PTPN14 when compared with FLS from patients with osteoarthritis (OA). PTPN14 knockdown in RA FLS impaired TGFβ-dependent expression of MMP13 and potentiation of TNF signalling. In RA FLS, PTPN14 formed a complex with YAP. Expression of PTPN14 or nuclear YAP—but not of a non-YAP-interacting PTPN14 mutant—enhanced SMAD reporter activity. YAP promoted TGFβ-dependent SMAD3 nuclear localisation in RA FLS. Differences in epigenetic marks within Hippo pathway genes, including YAP, were found between RA FLS and OA FLS. Inhibition of YAP reduced RA FLS pathogenic behaviour and ameliorated arthritis severity.ConclusionIn RA FLS, PTPN14 and YAP promote nuclear localisation of SMAD3. YAP enhances a range of RA FLS pathogenic behaviours which, together with epigenetic evidence, points to the Hippo pathway as an important regulator of RA FLS behaviour.
- Published
- 2019