Monitoring PDT-induced damage using spectrally resolved reflectance imaging of tissue oxygenation

Genady Kostenich, Sol Kimel, Shahar Peled, Arie Orenstein

Research output: Contribution to journalArticlepeer-review

Abstract

Photodynamic therapy (PDT) with chlorin e6 (Chl) was monitored in vivo using vital microscopy and Fourier transform spectral imaging (FT-SI). Mammary C26 colon carcinoma, implanted intradermally in a mouse, was irradiated at 650 nm with various radiant exposures, 3 h after administration of 5 mg/kg Chl. The photodynamic response (PDR) in the skin flap with tumor was expressed as microcirculation disturbances (thrombi formation, multiple embolizations, arteriolar occlusion and venous stasis) and, dependent on the radiant exposure, was transient or permanent. These biological manifestations were accompanied by a change in hemoglobin (Hb)/oxyhemoglobin (HbO2) absorption spectra obtained in vivo by FT-SI. False-color mapping of hemoglobin oxygen saturation (OS) visualized the alteration of tissue oxygenation. The results demonstrate, for the first time, that FT-SI can serve as a sensitive non-invasive tool for OS monitoring of PDT effects.

Original languageEnglish
Pages (from-to)169-175
Number of pages7
JournalCancer Letters
Volume219
Issue number2
DOIs
StatePublished - 10 Mar 2005
Externally publishedYes

Keywords

  • C26 colon carcinoma
  • Chlorin e
  • Hemoglobin/oxyhemoglobin spectra
  • Hypoxia
  • Mice
  • Microcirculation
  • Photodynamic response
  • Skin flap

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