Light Dose and Time Dependency of Photodynamic Cell Membrane Damage

Takashi Saito, Nick A. Hartell, Hitoshi Muguruma, Shu Hotta, Satoshi Sasaki, Masao Ito, Isao Karube

研究成果: Article査読

27 被引用数 (Scopus)


We have investigated the light dose and time dependency of photodynamic cell membrane damage using electrophysiological methods. This study controls the level of cell membrane damage by precisely administration of the light dose. The photosensitizer used was 5′,5″-bis(aminomethyl)-2,2′:5′,2″-terthiophene dihydrochloride (BAT). A confocal laser scanning microscope was used to provide rapid light activation (<1 s) and the subsequent membrane damage was monitored using standard patch clamp techniques. In the presence of 49 μM BAT, light levels less than 0.94 J/cm2 led to a reversible depolarization (∼20 mV) and reduction of resistance (∼10%) within 3 s of illumination. Higher intensities of illumination (>1.57 J/cm2) caused a complete and irreversible loss of membrane potential and cell membrane resistance within 8 s of illumination. The threshold dose of light required to induce cell death by illumination in the presence of BAT was increased in the presence of the antioxidant Trolox-C.

ジャーナルPhotochemistry and Photobiology
出版ステータスPublished - 1998 11月

ASJC Scopus subject areas

  • 生化学
  • 物理化学および理論化学


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