Development of a nanoparticle-based FRET sensor for ultrasensitive detection of phytoestrogen compounds

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Title
Development of a nanoparticle-based FRET sensor for ultrasensitive detection of phytoestrogen compounds
Author(s)
A B Dumbrepatil; Seung Goo Lee; Sang Jeon Chung; Myung Kyu Lee; Byoung Chul Park; T J Kim; Eui-jeon Woo
Bibliographic Citation
Analyst, vol. 135, no. 11, pp. 2879-2886
Publication Year
2010
Abstract
Phytoestrogens are plant compounds that mimic the actions of endogenous estrogens. The abundance of these chemicals in nature and their potential effects on health require the development of a convenient method to detect phytoestrogens. We have developed a nanoparticle (NP)-conjugated FRET probe based on the human estrogen receptor α (ER) ligand-binding domain (LBD) to detect phytoestrogens. The NP-conjugated FRET probe showed fluorescence signals for genistein, resveratrol and daidzein compounds with Δ ratios of 1.65, 2.60 and 1.37 respectively, which are approximately six times greater compared to individual FRET probes. A significantly higher signal for resveratrol versus genistein and daidzein indicates that the probe can differentiate between antagonistic phytoalexin substances and agonistic isoflavone compounds. NP-conjugated probes demonstrated a wide dynamic range, ranging from 10 -18 to 10-1 M with EC50 values of 9.6 × 10-10, 9.0 × 10-10 and 9.2 × 10-10 M for genistein, daidzein and resveratrol respectively, whereas individual probes detected concentrations of 10-13 to 10-4 M for phytoestrogens compounds. The time profile revealed that the NP-conjugated probe is stable over 30 h and there is not a significant deviation in the FRET signal at room temperature. These data demonstrate that conjugation of a FRET probe to nanoparticles is able to serve as an effective FRET sensor for monitoring bioactive compounds with significantly increased sensitivity, dynamic range and stability.
ISSN
0003-2654
Publisher
Royal Soc Chem
DOI
http://dx.doi.org/10.1039/c0an00385a
Type
Article
Appears in Collections:
Synthetic Biology and Bioengineering Research Institute > 1. Journal Articles
Critical Diseases Diagnostics Convergence Research Center > 1. Journal Articles
Division of Biomedical Research > Disease Target Structure Research Center > 1. Journal Articles
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