Determination of the maximal carcinoma/normal skin ratio after HpD or m-THPC administration in Hairless mice (SKH-1) by fluorescence spectroscopy.

Abstract:

:The two major steps in our study on the treatment of skin carcinomas by photochemotherapy (PCT) were the development of a skin tumor model in Hairless mice by a chemical carcinogenesis and the use of fluorescence spectroscopy, a semi-quantitative and non-invasive method, in order to determine the time after i.p. injection of photosensitizer when the tumor/normal skin ratio was the highest. A three-step carcinogenesis protocol provided mice bearing carcinomas and these were used to determine the tumor/normal skin ratios of two photosensitizers by fluorescence spectroscopy. Hematoporphyrin derivative (HpD) (5 mg/kg body weight) and m-tetra(hydroxyphenyl) chlorine (m-THPC) (0.3 mg/kg body weight) were injected i.p., and fluorescence was measured at 1, 4, 8, 12, 24, 48, 72 and 96 h after injection. The best carcinoma/normal skin ratio would be 3.2+/-1.4 for HpD and 2.7+/-2.1 for m-THPC, respectively. The delays required to reach these ratios were 72 h for HpD and 24 h for m-THPC. These results have to be considered with caution due to the high SEs and they must be confirmed by organic extraction. Photodynamic therapy with the same doses of HpD and m-THPC used in this pharmacokinetic study has to be carried out in order to compare the toxicities of the two photosensitizers and to determine which one is the best for this type of tumor.

journal_name

Anticancer Drugs

journal_title

Anti-cancer drugs

authors

Bossu E,Padilla-Ybarra JJ,Notter D,Vigneron C,Guillemin F

doi

10.1097/00001813-200002000-00004

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

85-91

issue

2

eissn

0959-4973

issn

1473-5741

journal_volume

11

pub_type

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