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  • Title: Jak inhibitor induces S phase cell-cycle arrest and augments TRAIL-induced apoptosis in human hepatocellular carcinoma cells.
    Author: Fuke H, Shiraki K, Sugimoto K, Tanaka J, Beppu T, Yoneda K, Yamamoto N, Ito K, Masuya M, Takei Y.
    Journal: Biochem Biophys Res Commun; 2007 Nov 23; 363(3):738-44. PubMed ID: 17904524.
    Abstract:
    Signal transducer and activator of transcription 3 (STAT3) is constitutively activated in various cancers and plays a crucial role in oncogensis, including the activation of genes encoding apoptosis inhibitors and cell-cycle regulators. We investigated the biological significance of the Janus kinase (Jak)-STAT pathway in human hepatocellular carcinoma (HCC). Constitutive activation of STAT3 was seen in 49.4% of human HCC specimens and in HCC cell lines. Jak inhibitor AG490 inhibited activation of STAT3 and markedly reduced cell viability without significant apoptosis. AG490 also induced S phase cell-cycle arrest with down-regulation of cyclin D1, A, E and up-regulation of p21, p27, phospho-Chk2. AG490 also inhibited caspase inhibitory proteins, such as XIAP and survivin, and augmented TRAIL-induced apoptosis. Our study suggests that the Jak-STAT pathway plays an important role in cell-cycle progression and resistance to apoptosis. Inhibition of the Jak-STAT pathway may thus be a therapeutic target for HCC.
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