Development of a label-free gold nanoparticle-based colorimetric aptasensor for detection of human estrogen receptor alpha

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• 作者：Rajesh Ahirwar ; Pradip Nahar
• 关键词：Gold nanoparticles ; RNA aptamer ; Colorimetric aptasensor ; Estrogen receptor alpha ; Breast cancer
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：408
• 期：1
• 页码：327-332
• 全文大小：774 KB
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• 作者单位：Rajesh Ahirwar (1) (2)
  Pradip Nahar (1) (2)
  
  1. Department of Chemical and Systems Biology, CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, 110007, India
  2. CSIR-Institute of Genomics and Integrative Biology, Academy of Scientific and Innovative Research, Delhi, 110007, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Food Science
  Inorganic Chemistry
  Physical Chemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-2650

文摘

The increasing demand for easily available and low-cost diagnostics has fuelled the development of aptasensors as platforms for rapid, sensitive, and point-of-care testing of target analytes. Recently, gold nanoparticle (AuNP)-based aptasensors have attracted wide recognition owing to their color transition properties which allow real-time rapid sensing of targets. In this study, we utilized the color transition property of aptamer-functionalized AuNPs to detect and quantify estrogen receptor alpha (ERα), a key biomarker protein in breast cancer. We found that the coating of AuNPs with unmodified ERα-RNA aptamer (GGGGUCAAGGUGACCCC) makes them resistant to salt-induced aggregation. However, addition of ERα to the aptamer-protected AuNPs results in their spontaneous aggregation as evident from a color transition from wine red to deep blue. On the basis of this, we developed an ERα aptasensor, with limits of detection and quantification of 0.64 and 2.16 ng/mL, respectively; the aptasensor can efficiently detect and quantify ERα in a working range of 10 ng/mL–5μg/mL protein. Validation of the aptasensor on cellular extracts of ERα-positive MCF-7 and ERα-deficient MDA-MB-231 breast cancer cells showed a target-selective response in ERα-positive samples but not in cellular extracts of ERα-deficient breast cancer cells. Further, the small size and simple fabrication chemistry of aptamers provide an additional benefit to make the ERα aptasensor a potentially useful and cost-effective tool in point-of-care analyses of ERα.