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Aptamer microarray mediated capture and mass spectrometry identification of biomarker in serum samples.

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Author

  • Ahn Ji-Young
  • Sang Wook Lee
  • Hye Suk Kang
  • Minjoung Jo
  • Dong-Ki Lee
  • Thomas Laurell
  • Soyoun Kim

Summary, in English

Sensitive detection of molecular biomarkers in clinical samples is crucially important in disease diagnostics. This paper reports the developement of an aptamer microarray platform combined with sol-gel technology to identify low-abundance targets in complex serum samples. Because of the nanoporous structure of the sol-gel, a high capacity to immobilize the affinity specific aptamers is accomplished which allows binding and detection of target molecules with high sensitivity. The captured protein is digested in situ and the obtained digest was analyzed by ESI-MS without any interference from the affinity probe. TBP (TATA Box Protein) and its specific aptamers were chosen as a model system. A proof of concept with protein concentrations ranging between nanomolar to micromolar is reported, showing a good linearity up to 400 nM when characterized in an aptamer sandwich assay. Moreover, as low as 0.001% of target protein present in total serum proteins could be identified without any pretreatment step using ESI MS/MS mass spectrometry. We believe this novel strategy could become an efficient method for aptamer-based biomarker detection linked directly to mass spectrometry readout.

Publishing year

2010

Language

English

Pages

5568-5573

Publication/Series

Journal of Proteome Research

Volume

9

Issue

11

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Medical Engineering

Keywords

  • sol-gel immobilization
  • aptamer microarray
  • sandwich assay
  • biomarkers
  • ESI MS/MS mass spectrometry

Status

Published

ISBN/ISSN/Other

  • ISSN: 1535-3893