e The apoptosis of A549 and H1299 cells transfected with si-circ_0020123-1 or si-circ_0020123-1?+?pcDNA3.1-THBS2 was detected by Flow cytolysis assay. by starBase 3.0 and TargetScan, and then confirmed by dual-luciferase reporter assay and RNA immunoprecipitation (RIP) assay. The animal experiment showed the effect of circ_0020123 on tumor growth in vivo. Results The expression of circ_0020123 was upregulated in NSCLC tissues and cells. Functionally, circ_0020123 downregulation inhibited the proliferation and migration and promoted the apoptosis of NSCLC cells. Interestingly, circ_0020123 directly targeted miR-590-5p, and inhibition of miR-590-5p reversed the knockdown effects of circ_0020123 on NSCLC cells. More importantly, THBS2 was a target of miR-590-5p, and THBS2 overexpression reversed the effects of circ_0020123 knockdown on cell proliferation, migration and apoptosis in NSCLC cells. Finally, suppression of circ_0020123 inhibited tumor growth in vivo through miR-590-5p/THBS2 axis. Conclusion NBR13 Circular RNA circ_0020123 regulated THBS2 by sponging miR-590-5p to promote cell proliferation and migration and inhibit cell apoptosis in NSCLC cells. through miR-590-5p/THBS2 axis. Background Lung cancer has the highest incidence (11.6% of total cases) and is the most common cause of cancer death (18.4% of total cancer deaths) in worldwide . Lung cancer can be divided into several histological subtypes according to the location and the tendency of metastasis. Small cell lung cancer (SCLC) accounts for about 15% of all lung cancer cases . However, non-small cell lung cancer (NSCLC) accounts for 85% of lung cancer, and the 5?years overall survival rate (OS) is about 15% . As a result, it’s important to get the effective treatment and potential molecular goals of NSCLC development. Round RNA (circRNA) is normally an individual stranded RNA molecule using a shut round structure. Recently, levels of round DNA have already been discovered, & most of which had been regarded as the by-products of usual splicing [4, 5]. Prior reports indicated which the appearance of circRNA was tissue-specific as well as the transformation of its appearance intensity Ginsenoside F1 was connected with Ginsenoside F1 some illnesses [6C8]. Furthermore, circRNA was mixed up in occurrence and advancement of the condition and might be utilized being a potential biomarker in scientific diagnosis, treatment and prognosis of illnesses [9, 10]. For instance, circ_0039569 facilitated cell proliferation and migration of renal cell carcinoma by sponging miR-34a-5p to modify CC Chemokine ligand 22 (CCL22) . On the other hand, hsa_circ_0043256 participated in the development of NSCLC cells by mediating the cinnamaldehyde treatment . A prior report recommended that circ_0020123 acted as an oncogene in NSCLC, and circ_0020123 governed zinc-finger-enhancer binding proteins 1 (ZEB1) and enhancer of zeste homolog 2 (EZH2) by competitively binding with miR-144 to induce cell development and migration . These reviews recommended that circ_0020123 was an essential element in the pathogenesis of Ginsenoside F1 NSCLC, and its own function and molecular system have to be additional studied. As a little endogenous RNA, microRNA (miRNA) is vital in regulating gene appearance and has a potential function in the exploitation of biomarkers . Lately, some aggregated miRNAs have already been within prostate cancer, such as for example miR-221/222, miR-143/145, miR-1/133a and miR-23b/27b/24-1, that have been had and down-regulated tumor inhibiting functions . A previous research discovered that circulating miR-590-5p could possibly be used as regular diagnostic equipment for lung cancers, so that as a potential prognostic marker for water biopsy. Besides, overexpression of miR-590-5p decreased the introduction of NSCLC cells, and governed the appearance of epithelial-mesenchymal change (EMT)-related protein by concentrating on the indication transducers and activators of transcription 3 (STAT3) . Nevertheless, the precise system where miR-590-5p impacts NSCLC needs additional analysis. Thrombospondin 2 (THBS2), being a secreted proteins, was verified to end up being portrayed in various malignancies extremely, including cervical cancers , colorectal cancers NSCLC and  . A previous survey recommended Ginsenoside F1 that THBS2 was mixed up in proliferation, apoptosis and anti-autophagy legislation of cervical cancers cells by miR-20a . Tian et al. discovered the appearance and clinicopathological features.