Photosensitization reaction along depth of a culture well with high concentration of talaporfin sodium for extra-cellular photodynamic therapy study

Masahiro Yajima, Hiroshige Kawakami, Emiyu Ogawa, Mei Takahashi, Tsunenori Arai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We studied photosensitization reaction progress in a cell culture well by oxygen partial pressure distribution measurement along the well depth direction with a high concentration of talaporfin sodium solution. The talaporfin sodium solution of 20 μg/ml in concentration with 2.8 mm thickness in the well was irradiated from the well bottom by 663 nm excitation laser with 0.29 W/cm 2. A small Clark-type oxygen electrode was used to measure oxygen partial pressure during the photosensitization reaction with approximately 200 μm resolution. Corrections against solution temperature change and direct light irradiation were applied to the electrode output. The oxygen partial pressures at various depths were decreased uniformly from the atmospheric oxygen partial pressure with the photosensitization reaction progress up to the irradiation of 1.0 J/cm2 in radiant exposure. In the case of photosensitization reaction over 1.0 J/cm2 in radiant exposure, the oxygen partial pressure distribution along the well depth was non-uniform. In the case of photosensitization reaction with 40 J/cm2 in radiant exposure in the solution without cells, there was pressure gradient of 2.8×104 mmHg/m from 0.5 to 1.0 mm in depth from the solution surface. In this case, there was no pressure gradient near the bottom of the well. In contrast, with myocardial cells at the bottom, oxygen partial pressure gradient of 7.5×103 mmHg/m from 1.5 to 2.0 mm in the depth was appeared after irradiation with 40 J/cm2 in radiant exposure. Consequently, we found that oxygen partial pressure distribution along the depth in the well with high concentration of talaporfin sodium solution was dynamically changed with time of the photosensitization reaction using the laser irradiation from the bottom. We think this dynamic pressure change in the well might be useful to understand the photosensitization reaction progress in the well experiment system in vitro corresponding to the extracellular PDT.

Original languageEnglish
Title of host publicationOptical Interactions with Tissue and Cells XXV; and Terahertz for Biomedical Applications
PublisherSPIE
ISBN (Print)9780819498540
DOIs
Publication statusPublished - 2014 Jan 1
EventOptical Interactions with Tissue and Cells XXV; and Terahertz for Biomedical Applications - San Francisco, CA, United States
Duration: 2014 Feb 22014 Feb 4

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume8941
ISSN (Print)1605-7422

Other

OtherOptical Interactions with Tissue and Cells XXV; and Terahertz for Biomedical Applications
CountryUnited States
CitySan Francisco, CA
Period14/2/214/2/4

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Keywords

  • Extra-cellular photosensitization reaction
  • NPe6
  • Oxygen diffusion
  • Oxygen partial pressure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Cite this

Yajima, M., Kawakami, H., Ogawa, E., Takahashi, M., & Arai, T. (2014). Photosensitization reaction along depth of a culture well with high concentration of talaporfin sodium for extra-cellular photodynamic therapy study. In Optical Interactions with Tissue and Cells XXV; and Terahertz for Biomedical Applications [89410V] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 8941). SPIE. https://doi.org/10.1117/12.2041950