Photosensitization reaction-induced acute electrophysiological cell response of rat myocardial cells in short loading periods of talaporfin sodium or porfimer sodium

Arisa Ito, Takehiro Kimura, Shunichiro Miyoshi, Satoshi Ogawa, Tsunenori Arai

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Electrophysiological responses of rat myocardial cells to exogenous photosensitization reactions for a short period of incubation with two photosensitizers, talaporfin sodium or porfimer sodium, were measured in a subsecond time scale. The loading period of the photosensitizer when the photosensitizer might not be taken up by the cells was selected as 15 min, which was determined by the fluorescence microscopic observation. We measured the intracellular Ca2+ concentration ([Ca2+]in) by using a fluorescent Ca2+ indicator, Fluo-4 AM, under a high-speed confocal laser microscope to evaluate the acute electrophysiological cell response to the photosensitization reaction. The measured temporal change in Fluo-4 fluorescence intensity indicated that the response to the photosensitization reaction might be divided into two phases in both photosensitizers. The first phase is acute response: disappearance of Ca 2+ oscillation when irradiation starts, which might be caused by ion channel dysfunction. The second phase is slow response: [Ca2+] in elevation indicating influx of Ca2+ due to the concentration gradient. The continuous Ca2+ influx followed by changes in cell morphology suggested micropore formation on the surface of the cell membrane, resulting in necrotic cell death.

Original languageEnglish
Pages (from-to)199-207
Number of pages9
JournalPhotochemistry and Photobiology
Volume87
Issue number1
DOIs
Publication statusPublished - 2011 Jan

Fingerprint

Dihematoporphyrin Ether
Photosensitivity Disorders
Photosensitizing Agents
rats
Rats
sodium
cells
Fluorescence
Acute-Phase Reaction
Cell death
Cell membranes
fluorescence
Ion Channels
Lasers
Microscopes
Cell Death
death
Cell Membrane
Irradiation
microscopes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Biochemistry
  • Medicine(all)

Cite this

Photosensitization reaction-induced acute electrophysiological cell response of rat myocardial cells in short loading periods of talaporfin sodium or porfimer sodium. / Ito, Arisa; Kimura, Takehiro; Miyoshi, Shunichiro; Ogawa, Satoshi; Arai, Tsunenori.

In: Photochemistry and Photobiology, Vol. 87, No. 1, 01.2011, p. 199-207.

Research output: Contribution to journalArticle

Ito, Arisa ; Kimura, Takehiro ; Miyoshi, Shunichiro ; Ogawa, Satoshi ; Arai, Tsunenori. / Photosensitization reaction-induced acute electrophysiological cell response of rat myocardial cells in short loading periods of talaporfin sodium or porfimer sodium. In: Photochemistry and Photobiology. 2011 ; Vol. 87, No. 1. pp. 199-207.
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