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Extended cavity laser enhanced two-photon flow cytometry.

Eric R Tkaczyk1, Alan H Tkaczyk, Steve Katnik

  • 1University of Michigan, Center for Ultrafast Optical Science, Electrical Engineering & Computer Science Department, Ann Arbor, Michigan 48109-2099, USA. etkaczyk@umich.edu

Journal of Biomedical Optics
|November 22, 2008
PubMed
Summary
This summary is machine-generated.

We improved two-photon flow cytometry sensitivity using a novel laser source. This allows for more accurate detection of labeled cells, even at low laser power, advancing cell analysis techniques.

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Area of Science:

  • Biophotonics
  • Cellular Analysis
  • Laser Technology

Background:

  • Two-photon flow cytometry (TPFC) is a powerful technique for cellular analysis.
  • Enhanced sensitivity in TPFC is crucial for detecting rare events and low-expressing cells.
  • Current TPFC methods face limitations in sensitivity, especially at low excitation power.

Purpose of the Study:

  • To demonstrate enhanced sensitivity in two-photon flow cytometry.
  • To investigate the performance of a home-built extended cavity laser oscillator as an excitation source.
  • To analyze the unique signal characteristics arising from different fluorophore distributions.

Main Methods:

  • Utilized a home-built 20-MHz extended cavity laser oscillator as the excitation source for TPFC.
  • Employed green fluorescent protein (GFP)-expressing MCA-207 cells cross-labeled with DiD.
  • Performed experiments in phosphate buffered saline (PBS) and whole blood.
  • Developed a geometrical model to interpret signal features.

Main Results:

  • Achieved significantly enhanced sensitivity at low laser power.
  • Detected a larger fraction of labeled cells compared to conventional methods.
  • Observed unique signal features including sub-square law scaling and sigmoidal sensitivity curves.
  • Demonstrated cell detection thresholds as low as a single photon.

Conclusions:

  • The extended cavity laser excitation source significantly improves TPFC sensitivity.
  • The observed unique signal features provide insights into fluorophore distribution and detection mechanisms.
  • This advancement enables more precise and sensitive cell detection in biological samples.