Transient receptor potential vanilloid 1(TRPVl) that is known as capsaicin receptor is a non-selective cationion channel[1]. TRPV1 can regulate Ca2+ influx, participate in a variety of physiological and pathological processof tumor[2]. One such agent is Capsazepine (CPZ) that is now widely used as a selective vanilloid type 1 receptor(TRPV1) antagonist. CPZ can be directly actived on the capsaicin receptor, blocked its biological effects, and abolishedosteosarcoma-induced hyperalgesia when administered subcutaneously at doses ranging from 3 to 10 mg/kg,blocked calcium channels[3]. However, the mechanisms underlying the anticancer effects of CPZ have not fully beenunderstood. Whether CPZ can induce apoptosis of human hepatocellular carcinoma cell line HepG2 is not known.Therefore, the objective of the study reported here was to determine whether CPZ can enhance radiation sensitivityin HepG2 cell, and impact on cell proliferation.
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