Effects and mode of action of 1,4-naphthoquinones isolated from Calceolaria sessilis on tumoral cells and Trypanosoma parasites
The naphthoquinones 2-hydroxy-3-(1,1-dimethylallyl)-1,4-naphthoquinone (CS-1), (−)-2,3,3-trimethyl-2–3-dihydronaphtho[2,3-b]furan-4, 9-quinone (CS-3), and 2-acetoxy-3-(1,1-dimethylallyl)-1,4-naphthoquinone (CS-5) isolated from Calceolaria sessilis were tested against Trypanosoma cruzi epimastigotes,...
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Published in | Comparative biochemistry and physiology. C, Comparative pharmacology and toxicology Vol. 112; no. 2; pp. 119 - 128 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier Inc
01.10.1995
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Subjects | |
Online Access | Get full text |
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Summary: | The naphthoquinones 2-hydroxy-3-(1,1-dimethylallyl)-1,4-naphthoquinone (CS-1), (−)-2,3,3-trimethyl-2–3-dihydronaphtho[2,3-b]furan-4, 9-quinone (CS-3), and 2-acetoxy-3-(1,1-dimethylallyl)-1,4-naphthoquinone (CS-5) isolated from
Calceolaria sessilis were tested against
Trypanosoma cruzi epimastigotes, the TA3 tumor cell line and the methotrexate-resistant subline TA3-MTX-R. Naphthoquinone CS-3 was the most active; the 50% culture growth inhibition (I
50) on
T. cruzi (Tulahuén and LQ strain and DM28c clone) was at concentrations ranging from 2.1 to 5.2 μmolar. Also CS-3 inhibited TA3 and TA3-MTX-R culture growth with an I
50 of 2.1 and 3.8 μmolar, respectively. Naphthoquinone CS-3 inhibited the respiration of the tumor cells by interfering with the electron transport at some point between NADH and ubiquinone. The respiration of
T. cruzi was not inhibited by naphthoquinone CS-3. Naphthoquinone CS-3 produced a temporary increase of oxygen consumption in
T. cruzi and tumor cells, suggesting the generation and participation of free radicals. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0742-8413 1367-8280 |
DOI: | 10.1016/0742-8413(95)02003-9 |