Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism
König J, Wyllie S, Wells G, Stevens MF, Wyatt PG, Fairlamb AH (2011)
The Journal of biological chemistry 286(10): 8523-8533.
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Autor*in
König, JanineUniBi;
Wyllie, Susan;
Wells, Geoffrey;
Stevens, Malcolm F;
Wyatt, Paul G;
Fairlamb, Alan H
Abstract / Bemerkung
Better drugs are urgently needed for the treatment of African sleeping sickness. We tested a series of promising anticancer agents belonging to the 4-substituted 4-hydroxycyclohexa-2,5-dienones class ("quinols") and identified several with potent trypanocidal activity (EC(50) < 100 nM). In mammalian cells, quinols are proposed to inhibit the thioredoxin/thioredoxin reductase system, which is absent from trypanosomes. Studies with the prototypical 4-benzothiazole-substituted quinol, PMX464, established that PMX464 is rapidly cytocidal, similar to the arsenical drug, melarsen oxide. Cell lysis by PMX464 was accelerated by addition of sublethal concentrations of glucose oxidase implicating oxidant defenses in the mechanism of action. Whole cells treated with PMX464 showed a loss of trypanothione (T(SH)(2)), a unique dithiol in trypanosomes, and tryparedoxin peroxidase (TryP), a 2-Cys peroxiredoxin similar to mammalian thioredoxin peroxidase. Enzyme assays revealed that T(SH)(2), TryP, and a glutathione peroxidase-like tryparedoxin-dependent peroxidase were inhibited in time- and concentration-dependent manners. The inhibitory activities of various quinol analogues against these targets showed a good correlation with growth inhibition of Trypanosoma brucei. The monothiols glutathione and L-cysteine bound in a 2:1 ratio with PMX464 with K(d) values of 6 and 27 μM, respectively, whereas T(SH)(2) bound more tightly in a 1:1 ratio with a K(d) value of 430 nM. Overexpression of trypanothione synthetase in T. brucei decreased sensitivity to PMX464 indicating that the key metabolite T(SH)(2) is a target for quinols. Thus, the quinol pharmacophore represents a novel lead structure for the development of a new drug against African sleeping sickness.
Stichworte
Trypanosomiasis/drug therapy;
Trypanosoma brucei brucei/metabolism;
Trypanosoma brucei brucei/genetics;
Time Factors;
Trypanocidal Agents/pharmacology;
Amide Synthases/metabolism;
Thioredoxins/metabolism;
Amide Synthases/genetics;
Animals;
Antineoplastic Agents/pharmacology;
Benzothiazoles/pharmacology;
Cysteine/genetics;
Cysteine/metabolism;
Dose-Response Relationship;
Drug;
Glutathione/analogs & derivatives;
Glutathione/genetics;
Glutathione/metabolism;
Hydroquinones/pharmacology;
Protozoan Proteins/metabolism;
Spermidine/analogs & derivatives;
Thioredoxins/genetics;
Spermidine/metabolism;
Trypanosomiasis/genetics;
Trypanosomiasis/metabolism
Erscheinungsjahr
2011
Zeitschriftentitel
The Journal of biological chemistry
Band
286
Ausgabe
10
Seite(n)
8523-8533
ISSN
0021-9258
eISSN
1083-351X
Page URI
https://pub.uni-bielefeld.de/record/2476559
Zitieren
König J, Wyllie S, Wells G, Stevens MF, Wyatt PG, Fairlamb AH. Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism. The Journal of biological chemistry. 2011;286(10):8523-8533.
König, J., Wyllie, S., Wells, G., Stevens, M. F., Wyatt, P. G., & Fairlamb, A. H. (2011). Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism. The Journal of biological chemistry, 286(10), 8523-8533. doi:10.1074/jbc.M110.214833
König, Janine, Wyllie, Susan, Wells, Geoffrey, Stevens, Malcolm F, Wyatt, Paul G, and Fairlamb, Alan H. 2011. “Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism”. The Journal of biological chemistry 286 (10): 8523-8533.
König, J., Wyllie, S., Wells, G., Stevens, M. F., Wyatt, P. G., and Fairlamb, A. H. (2011). Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism. The Journal of biological chemistry 286, 8523-8533.
König, J., et al., 2011. Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism. The Journal of biological chemistry, 286(10), p 8523-8533.
J. König, et al., “Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism”, The Journal of biological chemistry, vol. 286, 2011, pp. 8523-8533.
König, J., Wyllie, S., Wells, G., Stevens, M.F., Wyatt, P.G., Fairlamb, A.H.: Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism. The Journal of biological chemistry. 286, 8523-8533 (2011).
König, Janine, Wyllie, Susan, Wells, Geoffrey, Stevens, Malcolm F, Wyatt, Paul G, and Fairlamb, Alan H. “Antitumor quinol PMX464 is a cytocidal anti-trypanosomal inhibitor targeting trypanothione metabolism”. The Journal of biological chemistry 286.10 (2011): 8523-8533.
Daten bereitgestellt von European Bioinformatics Institute (EBI)
6 Zitationen in Europe PMC
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