Synergistic growth inhibition by acyclic retinoid and phosphatidylinositol 3-kinase inhibitor in human hepatoma cells
| Autor: | Hisashi Tsurumi, Hisataka Moriwaki, Tomohiko Ohno, Masahito Shimizu, Atsushi Baba, Daishi Terakura, Masaya Kubota, Yohei Shirakami, Takahiro Kochi |
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| Rok vydání: | 2013 |
| Předmět: |
Cyclin-Dependent Kinase Inhibitor p21
Cancer Research Carcinoma Hepatocellular Hepatocellular carcinoma Morpholines Acyclic retinoid Apoptosis Tretinoin Biology Phosphatidylinositol 3-Kinases chemistry.chemical_compound Cell Line Tumor RXRα Genetics Humans Cyclin D1 LY294002 Phosphorylation Extracellular Signal-Regulated MAP Kinases Protein kinase B PI3K/AKT/mTOR pathway Cell Proliferation Phosphoinositide-3 Kinase Inhibitors Retinoid X Receptor beta Retinoid X Receptor alpha Retinoid X receptor alpha Cell growth Liver Neoplasms Synergism Drug Synergism digestive system diseases Oncology chemistry Chromones Hepatocytes Cancer research Growth inhibition Retinoid X receptor beta Proto-Oncogene Proteins c-akt Research Article |
| Zdroj: | BMC Cancer |
| ISSN: | 1471-2407 |
| Popis: | Background A malfunction of RXRα due to phosphorylation is associated with liver carcinogenesis, and acyclic retinoid (ACR), which targets RXRα, can prevent the development of hepatocellular carcinoma (HCC). Activation of PI3K/Akt signaling plays a critical role in the proliferation and survival of HCC cells. The present study examined the possible combined effects of ACR and LY294002, a PI3K inhibitor, on the growth of human HCC cells. Methods This study examined the effects of the combination of ACR plus LY294002 on the growth of HLF human HCC cells. Results ACR and LY294002 preferentially inhibited the growth of HLF cells in comparison with Hc normal hepatocytes. The combination of 1 μM ACR and 5 μM LY294002, in which the concentrations used are less than the IC50 values of these agents, synergistically inhibited the growth of HLF, Hep3B, and Huh7 human HCC cells. These agents when administered in combination acted cooperatively to induce apoptosis in HLF cells. The phosphorylation of RXRα, Akt, and ERK proteins in HLF cells were markedly inhibited by treatment with ACR plus LY294002. Moreover, this combination also increased RXRE promoter activity and the cellular levels of RARβ and p21CIP1, while decreasing the levels of cyclin D1. Conclusion ACR and LY294002 cooperatively increase the expression of RARβ, while inhibiting the phosphorylation of RXRα, and that these effects are associated with the induction of apoptosis and the inhibition of cell growth in human HCC cells. This combination might therefore be effective for the chemoprevention and chemotherapy of HCC. |
| Databáze: | OpenAIRE |
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