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Dynamic analysis of pathogen-infected host cells using quantitative phase microscopy.

Seungrag Lee1, Young Ran Kim, Ji Yong Lee

  • 1Gwangju Institute of Science and Technology, Department of Information and Communications, Buk-gu, Gwangju, Republic of Korea.

Journal of Biomedical Optics
|April 5, 2011
PubMed
Summary

Quantitative phase microscopy (QPM) noninvasively tracks Vibrio vulnificus infection in host cells. QPM reveals dynamic cell changes caused by virulent strains, unlike non-toxic mutants.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Microbiology

Background:

  • Vibrio vulnificus is a pathogen causing severe infections.
  • Understanding host-pathogen interactions requires real-time cell analysis.
  • Quantitative Phase Microscopy (QPM) offers noninvasive cellular imaging.

Purpose of the Study:

  • To apply QPM for real-time analysis of Vibrio vulnificus-infected host cells.
  • To quantify dynamic morphologic and volumetric changes in infected cells.
  • To differentiate the effects of virulent and non-virulent V. vulnificus strains.

Main Methods:

  • Utilized interferometric quantitative phase microscopy (QPM).
  • Monitored rat basophilic leukemia RBL-2H3 cells infected with V. vulnificus.
  • Quantified cell volume, area, and phase images in real time.
  • Correlated QPM data with biochemical assays (LDH, β-hexosaminidase release).

Main Results:

  • QPM successfully monitored dynamic changes in V. vulnificus-infected RBL-2H3 cells.
  • Significant cell volume and area alterations were observed with wild-type V. vulnificus.
  • Infection with a noncytotoxic RtxA1 toxin mutant showed minimal cell changes.
  • QPM results correlated well with established biochemical assays.

Conclusions:

  • QPM is a powerful tool for noninvasive, real-time study of host-pathogen dynamics.
  • QPM can distinguish between pathogenic and non-pathogenic bacterial effects on host cells.
  • This method provides nanometer-level sensitivity for cellular analysis during infection.