Quantification of Cytokines Involved in Wound Healing Using Surface Plasmon Resonance
作者:Tina M. Battaglia、Jean-Francois Masson、Michael R. Sierks、Stephen P. Beaudoin、Joseph Rogers、Kevin N. Foster、G. Allen Holloway、Karl S. Booksh
DOI:10.1021/ac050568w
日期:2005.11.1
Sensing of three cytokines related to chronic wound healing, interleukin-1 (IL-1), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α), with detection limits at or below 1 ng/mL in buffered saline solution and spiked cell culture medium (CCM) has been achieved. Fiber-optic surface plasmon resonance (SPR) sensors are coated with an antibody binding layer and antibodies specific to the cytokine of interest are covalently attached to this layer. To achieve such detection limits in a complex medium such as CCM, total protein content of 4 mg/mL, the use of a novel N-hydroxysuccinimide ester of 16-mercaptohexadecanoic acid (NHS-MHA) is necessary. A comparison of the detection limits for IL-6 using currently widely used CM-dextran and NHS-MHA shows an improvement by a factor of 3 using NHS-MHA. The detection limits for the monitoring of cytokines in spiked saline solutions and CCM were similar for TNF-α and slightly higher for IL-1 and IL-6. The detection of each cytokine in the presence of interfering agents resulted in concentration prediction well within the error of calibration. The SPR sensors are stable in CCM after 20 min of pretreatment in CCM, minimizing the reliance on a reference sensor to quantify the cytokines in complex media. This technique enables a major advancement in the field of real-time monitoring of biologically relevant molecules in complex biological fluids.
已经实现了对三种与慢性伤口愈合相关的细胞因子(白细胞介素-1(IL-1)、白细胞介素-6(IL-6)和肿瘤坏死因子-α(TNF-α))的检测,在缓冲盐溶液和添加细胞的培养基(CCM)中的检测限为1 ng/mL或更低。光纤表面等离子共振(SPR)传感器涂有抗体结合层,与目标细胞因子特异的抗体共价结合在该层上。为了在CCM(总蛋白含量为4 mg/mL)等复杂介质中达到这样的检测限,必须使用一种新型的16-巯基十六烷酸N-羟基琥珀酰亚胺酯(NHS-MHA)。对目前广泛使用的CM-葡聚糖和NHS-MHA的IL-6检测限进行比较,结果表明使用NHS-MHA的检测限提高了3倍。在添加细胞的盐溶液和CCM中监测细胞因子的检测限对于TNF-α而言是相似的,对于IL-1和IL-6而言则略高。在干扰剂存在的情况下检测每种细胞因子,其浓度预测值完全在校准误差范围内。在CCM中预处理20分钟后,SPR传感器在CCM中保持稳定,从而最大程度地减少了对参考传感器的依赖,从而在复杂介质中量化细胞因子。这项技术使复杂生物液体中生物