Temperature Influence on Myocardial Cell Cytotoxicity of the Extracellular Photosensitization Reaction with Talaporfin Sodium and Serum Proteins at 17°-37°C

Emiyu Ogawa, Hiromi Takenoya, Tsunenori Arai

Research output: Contribution to journalArticle

Abstract

Background: We investigated the binding of talaporfin sodium with albumin and its photocytotoxicity during temperature changes by measuring absorbance spectra. The targeted tissue temperature differs according to the procedure. The photocytotoxicity efficiency should be investigated quantitatively because efficiency changes arising from temperature changes are expected. Materials and methods: The temperature dependence of talaporfin sodium binding with human serum albumin (0-20 mg/mL), high-density lipoprotein (0-0.04 mg/mL), and low-density lipoprotein (0-0.14 mg/mL) was investigated at 17°C, 27°C, and 37°C by measurement of absorbance spectra. Cell lethality was measured using a water-soluble tetrazolium-8 assay at 2 h after the photosensitization reaction at 17°C and 37°C. Results: The binding ratios of talaporfin sodium with high-density lipoprotein decreased by 6.3%and those with low-density lipoprotein decreased by 12.8%when the temperature increased from 17°C to 37°C. Cell lethality increased significantly with a temperature rise from 17°C to 37°C at irradiation exposure of 20 and 40 J/cm2 and talaporfin sodium concentration of 20 μg/mL. Conclusions: From our in vitro data, we can predict that the change in photocytotoxicity efficiency would be negligible with a temperature decrease of <5°C from the body temperature in the case of photodynamic ablation with a short drug-light interval.

Original languageEnglish
Pages (from-to)555-559
Number of pages5
JournalPhotomedicine and Laser Surgery
Volume35
Issue number10
DOIs
Publication statusPublished - 2017 Oct 1

Keywords

  • Myocardial cell
  • Photocytotoxicity
  • photocytotoxicity therapy

ASJC Scopus subject areas

  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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