TY - JOUR T1 - β-Arrestin2 Inhibits the Apoptosis and Facilitates the Proliferation of Fibroblast-like Synoviocytes in Diffuse-type Tenosynovial Giant Cell Tumor JF - Cancer Genomics - Proteomics JO - Cancer Genomics Proteomics SP - 461 LP - 470 DO - 10.21873/cgp.20272 VL - 18 IS - 3 Suppl AU - CHENXI CAO AU - YAN ZHANG AU - JIN CHENG AU - FEI WU AU - XINGYUE NIU AU - XIAOQING HU AU - XIAONING DUAN AU - XIN FU AU - JIYING ZHANG AU - XIN ZHANG AU - YINGFANG AO Y1 - 2021/05/01 UR - http://cgp.iiarjournals.org/content/18/3_Suppl/461.abstract N2 - Background/Aim: Diffuse-type tenosynovial giant cell tumor (TGCT) is a rare benign proliferative synovial neoplasm of uncertain etiology, and the efficacy of surgical resection is not satisfactory. Therefore, there is an urgent need to explore the pathogenesis and identify novel therapeutic targets for TGCT. Materials and Methods: Synovial tissues were collected from patients with TGCT and osteoarthritis (OA). Differences of mRNA expression between TGCT and OA were explored using mRNA-seq. In addition, fibroblast-like synoviocytes (FLS) were treated with small interfering RNA (siRNA) or adenovirus in order to knockdown or overexpress β-arrestin2 (Arrb2), respectively. FLS proliferation and apoptosis were evaluated using the MTT assay and the caspase 3 activity assay, respectively. Results: The expression of Arrb2 in TGCT was significantly higher than that in OA. The overexpression of Arrb2 promoted the proliferation of FLS and inhibited its apoptosis, while knocking down Arrb2 had the opposite effect. Further studies showed that Arrb2 can activate the PI3K-Akt signaling pathway, leading to increased proliferation of TGCT. Conclusion: Arrb2 facilitates the proliferation and inhibits the apoptosis of TGCT FLS through activating the PI3K-Akt cell survival pathway, providing new insight into the molecular mechanism of TGCT. ER -