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Proceedings Paper

Dose limited fluorescence microscopy of 5-aminolevulinic acid induced protoporphyrin IX in living cells
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Paper Abstract

Intracellular accumulation and location of photosensitizers, e.g. 5-ALA induced protoporphyrin IX, are crucial parameters for the efficiency of photodynamic therapy (PDT). Fluorescence microscopy has proved to be a powerful technique to assess these parameters, however, even at low light doses around or below 1 J/cm² cells may be irreversibly damaged. Therefore, prior to microscopic experiments non-phototoxic light doses were determined, and experimental conditions of laser scanning (LSM) and wide field microscopy were adapted to these doses. Wide field images appeared more brilliant than LSM images, thus demonstrating some advantage of simultaneous over sequential detection. In addition, human glioblastoma cells appeared less sensitive towards illumination by an evanescent electromagnetic field than towards epi-illumination, since only their plasma membranes and adjacent parts were exposed to light.

Paper Details

Date Published: 18 February 2009
PDF: 7 pages
Proc. SPIE 7164, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XVIII, 71640F (18 February 2009); doi: 10.1117/12.808813
Show Author Affiliations
H. Schneckenburger, Hochschule Aalen (Germany)
Univ. Ulm (Germany)
P. Weber, Hochschule Aalen (Germany)
M. Wagner, Hochschule Aalen (Germany)
S. Schickinger, Hochschule Aalen (Germany)
T. Bruns, Hochschule Aalen (Germany)
W. S. L. Strauss, Univ. Ulm (Germany)


Published in SPIE Proceedings Vol. 7164:
Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XVIII
David H. Kessel, Editor(s)

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