Emodin enhances cytotoxicity of chemotherapeutic drugs in prostate cancer cells: The mechanisms involve ROS-mediated suppression of multidrug resistance and hypoxia inducible factor-1
| Autor: | Chao Huang, Jing Yi, Gui-Ying Shi, Jie Wang, Yu-ying Chen, Xin-zhi Huang, Qing-Shen Hu |
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| Rok vydání: | 2008 |
| Předmět: |
Male
Cancer Research Emodin Cell Survival Antineoplastic Agents Pharmacology Biology Prostate cancer chemistry.chemical_compound Transactivation Tumor Cells Cultured medicine Humans Cytotoxic T cell Protein Kinase Inhibitors Cisplatin Prostatic Neoplasms medicine.disease Drug Resistance Multiple Multiple drug resistance Oncology chemistry Cell culture Cancer cell Molecular Medicine Hypoxia-Inducible Factor 1 Reactive Oxygen Species medicine.drug |
| Zdroj: | Cancer Biology & Therapy. 7:468-475 |
| ISSN: | 1555-8576 1538-4047 |
| DOI: | 10.4161/cbt.7.3.5457 |
| Popis: | The intrinsic or acquired resistance to multiple drugs (MDR) of cancer cells remains one of the main obstacles for chemotherapy. Development of small molecule targeting to hypoxia inducible factor-1 (HIF-1) has been recently proposed as strategy for treatments of drug-resistant solid tumors. In the present study, emodin, proven as a reactive oxygen species (ROS) generator by our previous work, was applied in combination with cisplatin and other chemotherapeutic drugs in the multidrug resistant prostate carcinoma cell line DU-145 and normal human dermal fibroblasts. Results showed that emodin/cisplatin co-treatment remarkably elevated ROS level and enhanced chemosensitivity in DU-145 cells, compared with cisplatin-only treatment, but exerted little effect on non-tumor cells. The effect of co-treatment on MDR1 gene and its upstream regulator HIF-1 was then investigated in DU-145. Co-treatment downregulated MDR1 expression and promoted drug retention, and meanwhile suppressed transactivation of HIF-1 in response to hypoxia without changing expression of HIF-1 alpha. The experiments on tumor-bearing mice showed that co-treatment inhibited the tumor growth in vivo, owing to oxidative stress and MDR1 down-regulation within tumors. HIF-1 transactivation and clonegenesis were suppressed in cells isolated from the tumors. Finally, examinations for the body weight, the organ histology and the antioxidant capacity of serum suggested that no systemic toxicity related to co-treatment was discernable. In conclusions, emodin, as a novel small inhibitor of HIF-1, may be recognized an effective adjunctive to improve efficacy of cytotoxic drugs in prostate cancer cells with over-activated HIF-1 and potent MDR. |
| Databáze: | OpenAIRE |
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