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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Laser-induced effects in different biological samples.

M Atif1, S Firdous, M Nawaz

  • 1Biophotonics Laboratory, National Institute of Lasers and Optronics, Islamabad, 45650, Pakistan. atifhull@gmail.com

Lasers in Medical Science
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

Photodynamic therapy (PDT) using lasers and photosensitizers like Photofrin can induce cell death in cancerous HeLa cells. Malignant blood serum exhibits distinct optical scattering properties compared to normal serum, aiding photodiagnosis.

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Area of Science:

  • Biophysics
  • Optical Engineering
  • Cancer Research

Background:

  • Photodynamic therapy (PDT) utilizes light-activated drugs to treat cancer.
  • Understanding cellular responses and optical properties is crucial for PDT optimization.
  • Distinguishing cancerous from non-cancerous biological samples via optical methods is an active research area.

Purpose of the Study:

  • To investigate the optical properties and cellular effects of PDT on cancerous HeLa cells and blood serum.
  • To evaluate the impact of Photofrin concentration and 5-aminolaevulinic acid on HeLa cells.
  • To differentiate between malignant and normal blood serum using laser-induced scattering.

Main Methods:

  • HeLa cells treated with varying concentrations of Photofrin and exposed to diode laser light.
  • Confocal microscopy used to observe cellular morphology and debris.
  • Irradiation of blood serum samples (cancerous and non-cancerous) with a He-Ne laser and double integrating sphere system.

Main Results:

  • Significant cell debris observed in HeLa cells at high Photofrin concentrations.
  • Photobleaching of fluorescence occurred in HeLa cells treated with 5-aminolaevulinic acid, with faster rates in highly fluorescent cells.
  • Malignant blood serum showed decreased forward and back scattering compared to normal serum, with an exponential decrease in fluorescence amplitude.

Conclusions:

  • PDT can induce significant cellular damage in cancer cells.
  • Photobleaching rates are dependent on initial cellular fluorescence.
  • Optical scattering differences in blood serum hold potential for photodiagnosis of cancer.