表面等离子共振(SPR)生物传感器 2011

Prognostic significance of cyclooxygenase-2 and response to chemotherapy in invasive ductal breast carcinoma patients by real time surface plasmon resonance analysis.

DNA and cell biology Singh AK, Parshad R, Pasi S, Madhavan T, Das SN, Mishra B, Gill K, Dalal K, Dey S
阅读原文 PDF DOI PubMed

组成图示

Prognostic significance of cyclooxyge... 传感器构成示意图

点击图片查看大图 · 依据论文自动绘制

传感器类型

表面等离子共振(SPR)生物传感器

检测对象

环氧合酶-2(COX-2,cyclooxygenase-2);样品基质:人血清、乳腺癌组织裂解液

检测原理

CM5芯片表面的羧甲基葡聚糖经EDC/NHS活化后,人抗COX-2 IgG抗体通过胺偶联固定,乙醇胺封闭剩余基团。样品中的COX-2与固定抗体特异性结合,使传感器界面质量与折射率发生变化,改变表面等离子体共振条件。SPR仪器实时记录共振单位(RU),结合量越大,RU变化越大。实验用纯化重组COX-2建立RU-浓度标准曲线,将1:99稀释的血清或组织裂解液获得的RU换算为COX-2浓度。该过程为无标记、实时检测,不依赖荧光或酶标记放大。

检测灵敏度

标准曲线范围: 3.3–49.5 μg;灵敏度斜率: y = 17.149x + 20111;1 RU = 1 pg/mm²

效应效果

患者血清COX-2为14.55±5.74 μg/mL,健康人3.5±1.3 μg/mL,约升高5倍(p<0.0001)。淋巴结转移组17.5±4.7 μg/mL高于无转移组13.5±3.7 μg/mL(p<0.0061);III期16.6±6.02 μg/mL高于I+II期13.73±3.4 μg/mL(p<0.015)。肿瘤大小无显著差异(p=0.24),与ER、PR、HER2无显著相关。新辅助化疗48例中33例(68.75%)COX-2下降,化疗前14.55±5.6 μg/mL,第二周期后8.87±3.97 μg/mL(p<0.0025)。辅助化疗术后10.07±3.5 μg/mL,术前15.15±5.89 μg/mL。癌组织16.03±3.08 μg/mL,正常组织9.84±2.85 μg/mL(p<0.0001)。Western blot验证血清COX-2。作者认为SPR实时无标记,可用于预后和疗效监测。

传感器的构成

  • 基底/换能器:CM5 SPR传感器芯片,提供羧甲基葡聚糖修饰表面并产生表面等离子共振信号
  • 活化层:EDC/NHS(N-ethyl-N'-(3-dimethylaminopropyl) carbodiimide / N-hydroxysuccinimide)活化羧甲基葡聚糖表面
  • 识别元件:人抗COX-2 IgG抗体(Human IgG-COX-2,Santa Cruz),通过胺偶联固定以捕获COX-2
  • 封闭剂:乙醇胺(ethanolamine)封闭未反应基团
  • 校准物:纯化重组COX-2(purified recombinant COX-2),用于建立RU-浓度标准曲线
  • 样品缓冲液:HBS-EP缓冲液(0.01 M HEPES、0.15 M NaCl、2 mM EDTA、0.005% surfactant P20,pH 7.4),用于稀释血清和组织裂解液
  • 读出:SPR仪器记录共振单位(RU),依据标准曲线换算COX-2浓度

中文摘要

环氧合酶-2(COX-2)是一种诱导性酶,参与乳腺癌进展和血管生成。本研究旨在定量检测COX-2浓度,并分析其与侵袭性导管癌患者临床病理参数及化疗反应的关系。作者采用基于表面等离子共振(SPR)的新型生物传感器,检测84例乳腺癌患者(48例新辅助化疗、36例辅助化疗)和40例年龄、性别匹配健康人血清中的COX-2水平。结果显示,患者血清COX-2水平显著高于健康人;存在淋巴结转移的患者COX-2水平更高;68%(33/48)接受新辅助化疗的患者COX-2水平显著下降。研究提示,新辅助和辅助化疗均可显著降低乳腺癌患者血清COX-2水平,血清COX-2可作为乳腺癌肿瘤标志物,用于疾病预后评估和化疗疗效监测。

英文摘要

Cyclooxygenase-2 (COX-2), an inducible enzyme, has been implicated in the progression and angiogenesis of breast cancer. The aim of the study is to quantify the concentration of COX-2 and its association with clinico-pathological parameters and response to treatment in patients with invasive ductal carcinoma receiving both neo-adjuvant and adjuvant chemotherapy. The level of COX-2 was estimated using a novel biosensor-based surface plasmon resonance technique in serum of 84 patients with breast cancer (48 patients of neo-adjuvant chemotherapy and 36 patients of adjuvant chemotherapy) and 40 age- and gender-matched normal individuals. A significant increase in COX-2 level was observed in patients compared with normal individuals (p>0.0001). The COX-2 level in serum was found to be significantly higher in patients with lymph node involvement (p<0.0061). 68% (33/48) of the patients receiving neo-adjuvant chemotherapy showed significantly (p<0.0025) reduced COX-2 levels. This study shows significant decrease of COX-2 level in patients with breast cancer treated with both neo-adjuvant and adjuvant chemotherapy. Estimation of COX-2 level in serum may serve as a tumor biomarker in patients with breast cancer.