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Related Concept Videos

Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.

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Rapid immuno-SERS microscopy for tissue imaging with single-nanoparticle sensitivity.

Mohammad Salehi1, Dennis Steinigeweg, Philipp Ströbel

  • 1Department of Physics, University of Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany.

Journal of Biophotonics
|December 11, 2012
PubMed
Summary

This study shows that gold nanosphere clusters, not single particles, enable rapid immuno-Surface-Enhanced Raman Scattering (SERS) microscopy. This breakthrough allows faster screening of tissue specimens with high sensitivity.

Keywords:
gold nanoparticlesimmunohistochemistrysurface-enhanced Raman scatteringtissue imaging

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Area of Science:

  • Nano-biophotonics
  • Optical microscopy
  • Biomedical imaging

Background:

  • Immuno-Surface-Enhanced Raman Scattering (SERS) microscopy combines antibody-based targeting with SERS nanoparticles for sensitive bio-imaging.
  • Rapid data acquisition is crucial for efficient screening of large tissue samples in immuno-SERS microscopy.
  • Achieving single-particle sensitivity is key to avoiding false-negative results in SERS-based diagnostics.

Purpose of the Study:

  • To investigate the role of SERS labels in achieving single-particle sensitivity for immuno-SERS microscopy.
  • To demonstrate the feasibility of rapid data acquisition (30 msec/pixel) in immuno-SERS microscopy.
  • To validate the technique for selective imaging of specific biomarkers in tissue.

Main Methods:

  • Utilized a combination of SERS microscopy, dark-field microscopy, and high-resolution scanning electron microscopy (HR-SEM).
  • Investigated the SERS sensitivity of different gold nanosphere cluster configurations (monomers, dimers, trimers).
  • Performed proof-of-concept experiments on prostate tissue sections for p63 biomarker imaging.

Main Results:

  • Glass-coated gold nanosphere dimers and trimers demonstrated single-particle SERS sensitivity at acquisition times of 30 msec/pixel.
  • Gold nanosphere monomers did not exhibit the required single-particle sensitivity under the same rapid acquisition conditions.
  • Successfully demonstrated rapid, selective imaging of the p63 protein in prostate tissue using the optimized immuno-SERS approach.

Conclusions:

  • Small clusters of gold nanospheres are essential for achieving high sensitivity in rapid immuno-SERS microscopy.
  • The developed method enables significantly faster screening of tissue specimens compared to previous techniques.
  • This advancement holds promise for improved diagnostic capabilities in pathology and biomedical research.