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|Title:||ABT-869, a multi-targeted tyrosine kinase inhibitor, in combination with rapamycin is effective for subcutaneous hepatocellular carcinoma xenograft|
|Authors:||Jasinghe, V.J. |
Tyrosine kinase inhibitor
|Source:||Jasinghe, V.J., Xie, Z., Zhou, J., Khng, J., Poon, L.-F., Senthilnathan, P., Chen, C.-S., Albert, D.H., Davidsen, S.K. (2008). ABT-869, a multi-targeted tyrosine kinase inhibitor, in combination with rapamycin is effective for subcutaneous hepatocellular carcinoma xenograft. Journal of Hepatology 49 (6) : 985-997. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jhep.2008.08.010|
|Abstract:||Background/Aims: Receptor tyrosine kinase inhibitors (RTKIs) and mTOR inhibitors are potential novel anticancer therapies for HCC. We hypothesized that combination targeted on distinctive signal pathways would provide synergistic therapeutics. Methods: ABT-869, a novel RTKI, and rapamycin were investigated in HCC pre-clinical models. Results: Rapamycin, but not ABT-869, inhibited in vitro growth of Huh7 and SK-HEP-1 HCC cells in a dose dependant manner. However, in subcutaneous Huh7 and SK-HEP-1 xenograft models, either ABT-869 or rapamycin can significantly reduce tumor burden. Combination treatment reduced the tumors to the lowest volume (95 ± 20 mm3), and was significantly better than single agent treatment (p < 0.05). Immunohistochemical staining of tumor shows that ABT-869 potently inhibits VEGF in HCC in vivo. In addition, the MAPK signaling pathway has been inhibited by significant inhibition of phosphorylation of p44/42 MAP kinase by ABT-869 in vivo. Rapamycin inhibits phosphorylation of p70 S6 kinase and 4E-BP-1, downstream targets of mTOR, and decreases VEGF. Combination treatment showed synergistic effect on expression levels of p27 in vivo. Dramatic inhibition of neo-angiogenesis by ABT-869 was also demonstrated. Conclusions: HCC could potentially be treated with the combination treatment of ABT-869 and rapamycin. Clinical trials on combination therapy are warranted. © 2008 European Association for the Study of the Liver.|
|Source Title:||Journal of Hepatology|
|Appears in Collections:||Staff Publications|
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