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Visualizing intracellular target antigens in live cells.

Hiroshi Ueda1, Yancen Dai2, Farid Ghadessy3

  • 1Graduate School of Life Science and Technology, Tokyo Institute of Technology, Nagatsuta-cho, Yokohama, Kanagawa 226-8503, Japan.

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Summary

Researchers developed a novel Quenchbody (Q-body) probe for precise live-cell imaging of endogenous proteins. This antigen-binding fragment-based tool enables clear visualization and sorting of cells expressing the tumor suppressor biomarker p53.

Keywords:
cancer diagnosticscellular immunofluorescencelive-cell imagingp53quenchbody

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Molecular Imaging

Background:

  • Visualizing intracellular dynamics is crucial for understanding cellular processes.
  • Existing methods for protein imaging in live cells face limitations in precision and specificity.
  • Endogenous protein detection requires highly sensitive and specific molecular probes.

Purpose of the Study:

  • To develop and validate a novel imaging probe for precise visualization of endogenous proteins in live cells.
  • To demonstrate the utility of the developed probe for detecting a specific tumor suppressor biomarker.
  • To enable cell sorting based on the expression of the target biomarker.

Main Methods:

  • Utilized an antigen-binding fragment (Fab)-based Quenchbody (Q-body) probe for intracellular protein imaging.
  • Performed transfection of Q-body probes into live cells.
  • Analyzed antigen-dependent fluorescence response for protein visualization.
  • Applied fluorescence detection for cell sorting based on biomarker expression.

Main Results:

  • The Quenchbody probe demonstrated antigen-dependent fluorescence, enabling precise protein visualization.
  • Successfully visualized and sorted live cells expressing the p53 tumor suppressor biomarker.
  • Confirmed the probe's effectiveness in detecting endogenous protein expression with high specificity.

Conclusions:

  • Quenchbodies offer a powerful tool for high-precision imaging of endogenous proteins in live cells.
  • This technology facilitates the study of intracellular dynamics and biomarker-specific cell analysis.
  • The developed Q-body probe shows significant potential for cancer research and diagnostics.