Mechanism of (-)-Epigallocatechin -3-gallate (EGCG) to Modulate the Cytotoxic Effects of Chemotherapeutic Agents in Human Urothelial Carcinoma Cells
试验速览
- 阶段
- 不适用
- 入组人数
- 25
- 试验地点
- 1
- 主要终点
- The IHC staining score
研究概览
简要总结
Urothelial carcinoma (UC) is the most common cancer of urinary tract. Patients with metastatic UC are usually treated with systemic chemotherapy. There still existed 30% to 50% of advanced UC not responsive to cisplatin-based chemotherapy; the prognosis for patients with metastatic UC remains poor.
详细描述
(-)-epigallocatechin -3-gallate (EGCG) is the most abundant polyphenol compound from green tea, representing ~16.5% of the water-extractable fraction. EGCG have various bioactivities and can bind and regulate a wide range of molecular involved in cell cycle, signal transduction, and protein degradation. However, the anticancer effects of EGCG on UC have not been thoroughly explored. Our preliminary data show that EGCG alone can inhibit cell proliferation and induce apoptosis with the activation of caspases and PARP in a time dependent manner. Moreover, EGCG can enhance the cytotoxicity of several chemotherapeutic drugs in vitro. The underlying mechanism seems to be associated with Akt and ERK pathway. We will also check the Akt and ERK protein level by immunohistochemical staining in clinically chemoreistant bladder urothelial carcinoma specimens to further prove our in vitro findings. We will further confirm the effect of chemotherapeutic drugs combined with EGCG on UC in vivo via xenograft model.
The specific aims of the study are:
- To explore the anti-tumor effects of EGCG on human UC cells and elucidate the possible mechanisms.
- To study the combinative cytotoxic effect of EGCG with other chemotherapeutic agents such as cisplatin, doxorubicin and gemcitabine on UC cells; moreover, to investigate the underlying mechanisms.
- To investigate the expression level of phospho-Akt and phospho-ERK in clinically chemoreistant bladder urothelial carcinoma specimens to further confirm our finding in clinical events. .
- To prove the in vitro findings and confirm the combinative efficacy of EGCG with chemotherapeutic agents in vivo by using the xenograft animal model.
- To establish a novel therapeutic strategy for treatment of UC.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Only
- 时间视角
- Cross Sectional
入排标准
- 年龄范围
- 20 Years 至 80 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •In January 2008 to December 2012 at the National Taiwan University Hospital for surgery (radical resection of kidney and ureter or bladder removal) of urothelial carcinoma histopathology specimens of patients willing to participate in this study and the subjects described in the consent Book signer.
排除标准
- •In January 2008 to December 2012 at the National Taiwan University Hospital for surgery (radical resection of kidney and ureter or bladder removal) of urothelial carcinoma histopathology specimens of patients are reluctant to join the researcher
结局指标
主要结局
The IHC staining score
时间窗: at the time of surgery
the IHC staining scores are acquired by IHC staining and assessed by pathologist. The comparisons between each specimen are determined by IHC scores.
次要结局
未报告次要终点