title: [Effect of phototoxic substances on simple biological systems. I. Standardizing the method with furocoumarins].
abstract: As a basis for the investigation of new substances in respect of their photosensitization effects, we established and standardized 3 microbiological test systems, which enabled us to do without animal experiments. Using several furocumarines and various sources of light, we performed a comparative study on the eukaryotes, Chlamydomonas reinhardii (CR) and Candida albicans, and the prokaryote, Bacillus subtilis. We found that, if different light qualities were employed, our test systems also allowed a comparison of different substances by means of half-quantitative evaluation of the inhibiting areolas, which appear after exposure. With regard to the furocumarines, 8- and 5-methoxypsoralene (MOP) had the strongest photosensitizing effect under all test conditions. The remaining furocumarines showed decreasing effectiveness from psoralene to trimethylpsoralene (TMP) and imperatorine; psoralene, however, was slightly more effective in CR than 5-MOP. With the exception of CR, TMP had a stronger effect on the micro-organisms than imperatorine.
authors: Abt. Dermatologie und Venerologie I, Universitäts-Hautklinik Göttingen.
authors: K H
authors: KH
authors: Schlacke
authors: J
authors: J
authors: Geier
authors: F
authors: F
authors: Dittrich
authors: H
authors: H
authors: Ippen
mesh_terms: D000818:Animals; D001412:Bacillus subtilis / Q000187:drug effects*; D002176:Candida albicans / Q000187:drug effects*; D002696:Chlamydomonas / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D011564:Furocoumarins / Q000633:toxicity*; D010787:Photosensitivity Disorders / Q000209:etiology*; D013329:Structure-Activity Relationship
chemical_list: D011564:Furocoumarins
vernacular_title: Untersuchungen über die Wirkung phototoxischer Substanzen auf einfache biologische Systeme I. Standardisierung der Methode mit Furocumarinen.