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01-07-2008 | Original Article

Uptake and retention of the photosensitizer mono-l-asparthyl chlorine e6 in experimental malignant glioma

Authors: Hiroyuki Matsumura, Jiro Akimoto, Jo Haraoka, Katsuo Aizawa

Published in: Lasers in Medical Science | Issue 3/2008

Abstract

The objective of the study was to investigate the potential of mono-l-aspartyl chlorine e6 (NPe6), a water-soluble photosensitizer derived from chlorophyll, for use in photodynamic diagnosis (PDD) of malignant brain tumor. A C6 glioma cell line was transplanted in the SD rat brain to create a brain tumor model. Five days after transplantation, NPe6 was administrated via the tail vein at concentrations ranging from 1.25 to 10 mg/kg; then the skull was opened in the rat brain, the site of tumor transplant was irradiated with a diode laser beam at 664 nm, and the time-course intensity and distribution of emerging fluorescence were observed. Furthermore, the correlation between fluorescence distribution and histopathological findings was investigated in the removed brain. Fluorescence was observed in the site of brain tumor transplant from 5 min after injection, and stable fluorescence was recognized at the site until 4 h after administration. No differences were noted in fluorescence intensity at NPe6 doses of 2.5 mg/kg or more; therefore, it was possible to estimate the optimal dose range. Fluorescence distribution had a clear correlation with tumor cell density, and it was possible to capture the margin of tumor cell invasion with fluorescence. The photosensitizer NPe6 is capable of assessing tumor cell density in malignant glioma tissue in terms of differences in fluorescence intensity. The usefulness of PDD using 5-aminoleveulinic acid during surgery for malignant glioma has been recognized in recent years. The results of the present study suggested the potential of NPe6 as a promising photosensitizer for use in PDD for accurate grasp of the extent of removal during the course of malignant glioma surgery.

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Title: Uptake and retention of the photosensitizer mono-l-asparthyl chlorine e6 in experimental malignant glioma
Authors: Hiroyuki Matsumura
Jiro Akimoto
Jo Haraoka
Katsuo Aizawa
Publication date: 01-07-2008
Publisher: Springer-Verlag
Published in: Lasers in Medical Science / Issue 3/2008
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI: https://doi.org/10.1007/s10103-007-0469-3

At a glance: The STEP trials

Springer Medicine

Uptake and retention of the photosensitizer mono-l-asparthyl chlorine e6 in experimental malignant glioma

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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