Ectonucleotidase activity was analyzed

by thin layer chro

Ectonucleotidase activity was analyzed

by thin layer chromatography (TLC). Results: TTK protein levels were significantly increased in HBV-HCC, compared to adjacent noncancerous liver tissues (p=9.8×10-12). ADO promoted proliferation of HepG2 cells via A2A receptor. Knockdown of TTK in HepG2 cells decreased both anchorage-dependent and -independent cell growth, while enhancing senescence and autophagy. ADO stimulation altered mTOR, AMPK and p53 signaling transduction as well as autophagy in TTK deficient cells, when compared with control knockdown cells. TTK deficiency resulted in altered expression profiles of purinergic receptors, heightened adenosine deaminase 1 (ADA1) and changes in other ectonucleotidases. Suppression of TTK antagonized growth-promoting effect of ADO-A2A signaling by enhanced ADA1 scavenging of ADO in vitro. Conclusions: Targeted inhibition of TTK in combination with blockade of ade-nosinergic signaling via boosting GDC-0449 supplier ADA1 expression/activity might find utility as an adjunct therapy in HCC management. Disclosures: Lian He – Employment: Bayer HealthCare Simon C. Robson – Grant/Research Support: Pfizer, NIH; Independent Contractor: eBioscience, Biolegend, EMD Millipore, Mersana; Speaking and Teaching: ACP, Elsevier, ATC; Stock Shareholder: Nanopharma, Puretech The following people have nothing

to disclose: Ruoyu Miao, Yan Wu, Haohai Zhang, Huandi Zhou, Xiaofeng Sun, Eva Csizmadia, Yi Zhao, Chengyu Jiang, Haitao Zhao Background and aims: Hepatocellular carcinoma 上海皓元 (HCC) is a complex disease involving interactions between the tumor and the immune system. CD4+ T follicular helper (Tfh) cell, is a new group of immune cell that has been reported to involved in all kinds of diseases, such as autoimmune

disease, primary immunodeficiency, acquired immunodeficiency(i.e.,HIV), viral infection disease (HBV, HCV et al), Tfh-like lymphoma and malignancies. However, their functional role in human hepa-tocellular carcinoma (HCC) is relatively unknown. Methods: A total of 85 HCC patients with hepatitis B virus (HBV) infection, 25 HBV-relative liver cirrhosis (LC) patients, and 20 healthy controls were enrolled randomly. Flow cytometric, immunohis-tochemical, and relative functions (including cytokine secretion, help B cells’ maturation) assay were used for analysis of properties of CD4+CXCR5+ T cells (Tfh). In addition, the relationship between the frequency of CD4+CXCR5+ T cell and overall survival or disease-free survival was also analyzed by using Kaplan-Meier survival curves. Result: The frequency of circulating CD4+CXCR5+ T cells were significantly decreased in HCC patients compared with HBV-relative liver cirrhosis (LC) patients and healthy controls, and correlated with disease progression. The proportion of infiltrated CD4+CXCR5+ T cells were significantly decreased in tumor regions compared with nontumor regions (P = 0.0109).

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