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Silver nanoparticle-induced degranulation observed with quantitative phase microscopy.

Wenzhong Yang1, Seungrag Lee, Jiyong Lee

  • 1Department of Information and Communications, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Republic of Korea. wzyang@gist.ac.kr

Journal of Biomedical Optics
|August 31, 2010
PubMed
Summary

Optical quantitative phase microscopy (QPM) enables real-time imaging of mast cell degranulation without fluorescence. This technique successfully monitored cell volume changes during degranulation triggered by A23187 and silver nanoparticles.

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Area of Science:

  • Immunology
  • Pharmacology
  • Biophysics

Background:

  • Mast cell degranulation is crucial in immunology and pharmacology.
  • Traditional optical microscopy lacks the resolution for real-time observation of granule dynamics.
  • Fluorescence imaging is the primary method, but requires labeling.

Purpose of the Study:

  • To introduce optical quantitative phase microscopy (QPM) as a novel, label-free imaging technique for live mast cell degranulation.
  • To assess QPM's capability in monitoring cellular changes during degranulation.

Main Methods:

  • Quantitative Phase Microscopy (QPM) was employed to image RBL-2H3 and HeLa cells.
  • Cell volumes and cross-sectional profiles were measured before and after stimulation.
  • Stimulants included calcium ionophore A23187 and silver nanoparticles (AgNPs).

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Main Results:

  • QPM successfully detected significant changes in RBL-2H3 cell volume and cross-sectional profiles upon A23187 exposure.
  • AgNP exposure also induced degranulation processes in RBL-2H3 cells, as indicated by QPM measurements.
  • Results were corroborated by standard fluorescent methods measuring intracellular calcium and histamine.

Conclusions:

  • Optical QPM is a viable, label-free tool for real-time monitoring of mast cell degranulation.
  • QPM provides quantitative insights into cell volume and shape dynamics during degranulation.
  • This technique offers a new avenue for studying cellular responses in immunology and pharmacology.