A redox-silent analogue of tocotrienol acts as a potential cytotoxic agent against human mesothelioma cells
| Autor: | Kayono Harada, Wakiko Kido, Tomohiro Yano, Yoshihisa Yano, Kiyokazu Hagiwara, Nantiga Virgona, Akira Ando, Korehito Kashiwagi |
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| Rok vydání: | 2009 |
| Předmět: |
Mesothelioma
STAT3 Transcription Factor Cell signaling Cell Protein Array Analysis Antineoplastic Agents Apoptosis Antioxidants General Biochemistry Genetics and Molecular Biology Cell Line Tumor medicine Humans Epidermal growth factor receptor General Pharmacology Toxicology and Pharmaceutics STAT3 biology Cell growth Tocotrienols Cell Cycle General Medicine Cell cycle Cell biology Enzyme Activation src-Family Kinases medicine.anatomical_structure Drug Resistance Neoplasm biology.protein Signal transduction Oxidation-Reduction Proto-oncogene tyrosine-protein kinase Src |
| Zdroj: | Life Sciences. 84:650-656 |
| ISSN: | 0024-3205 |
| Popis: | Aims Malignant mesothelioma is an aggressive cancer with no effective treatment options. A redox-silent analogue of α-tocotrienol, 6- O -carboxypropyl-α-tocotrienol (T3E) is a new potential anti-carcinogenic agent with less toxic effect on non-tumorigenic cells. Here, we evaluated the effect of T3E on killing of chemoresistant mesothelioma cell (H28). Main methods The cytotoxic effect of T3E was evaluated by a WST-1 assay, and cell cycle and apoptosis analysis were done by FACS. Each signal molecule's activity was determined by protein array and immunoblot analysis. Key findings T3E effectively inhibited H28 cell growth at practical pharmacological concentrations (10–20 μM) without any effect on non-tumorigenic mesothelial cell (Met-5A). Inhibition of H28 cell growth by T3E mediated through G2/M arrest in cell cycle and induction of apoptosis. Protein array and immunoblot analyses revealed that T3E inhibited the activation of epidermal growth factor receptor (EGFR) via the inactivation of the Src family of protein tyrosine kinases (Src). However, the blockade of the EGFR signaling was not associated with the T3E-dependent H28 cell growth control. In addition to Src inactivation, T3E inhibited signal transduction and activation of transcription Stat3. A combination of an Src inhibitor, PP2, and a Stat3 inhibitor, AG490, induced G2/M arrest and enhanced apoptosis compared with PP2 alone. These results suggest that T3E suppresses H28 cell growth via the inhibition of Src activation and Src-independent Stat3 activation. Significance T3E can be a new effective therapeutic agent against chemoresistant mesothelioma cells. |
| Databáze: | OpenAIRE |
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