Green tea extract selectively targets nanomechanics of live metastatic cancer cells.

Green tea extract selectively targets nanomechanics of live metastatic cancer cells.
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DOI:
10.1088/0957-4484/22/21/215101
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发表时间:
2011-05-27
期刊:
影响因子:
3.5
通讯作者:
Gimzewski JK
Gimzewski JK
中科院分区:
材料科学3区
文献类型:
--
作者:
Cross SE;Jin YS;Lu QY;Rao J;Gimzewski JK

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绿色茶提取物(GTE)是一种具有多种生物活性的潜在抗癌药物,但其确切的作用机制尚不清楚。使用原子力显微镜(AFM)测量直接从患者身体样品中取出的GTE处理的细胞的生物力学响应。我们发现GTE处理的转移性肿瘤细胞的硬度显著增加,所得值与未处理的正常间皮细胞相似,而GTE处理后的间皮细胞硬度不变。免疫荧光分析显示,GTE处理的肿瘤细胞中的胞浆-F-肌动蛋白增加,表明GTE处理的肿瘤细胞显示与正常细胞相似的机械、结构和形态学特征,这似乎是由膜联蛋白-I表达介导的,如通过体外细胞系模型的siRNA分析所确定的。我们的数据表明,GTE选择性地靶向人转移癌细胞,而不是正常的间皮细胞,这一发现与传统的化疗药物相比具有显著的优势。
Green tea extract (GTE) is known to be a potential anticancer agent with various biological activities yet the precise mechanism of action is still unclear. The biomechanical response of GTE treated cells taken directly from patient’s body samples was measured using atomic force microscopy(AFM). We found significant increase in stiffness of GTE treated metastatic tumor cells, with a resulting value similar to untreated normal mesothelial cells, whereas mesothelial cell stiffness after GTE treatment is unchanged. Immunofluorescence analysis showed an increase in cytoskeletal-F-actin in GTE treated tumor cells, suggesting GTE treated tumor cells display mechanical, structural and morphological features similar to normal cells, which appears to be mediated by annexin-I expression, as determined by siRNA analysis of an in vitro cell line model. Our data indicates that GTE selectively targets human metastatic cancer cells but not normal mesothelial cells, a finding that is significantly advantageous compared to conventional chemotherapy agents.
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