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Antimutagenic activity of fluphenazine in short-term tests
K Gasiorowski1, B Brokos, K Szyba
1Department of Basic Medical Sciences, Wrocłlaw Medical University, 14 Kochanowskiego Str., 51-601 Wrocłlaw, Poland. kaz@basmed.am.wroc.pl
Abstract:
Fluphenazine, an antipsychotic drug that belongs to the phenothiazine family, reduced the genotoxicity of direct- and indirect-acting mutagens in the Ames test, both in the presence and in the absence of promutagen-activating S9 fraction. In short-term tests on human lymphocytes, the inhibitory effect of fluphenazine on the genotoxicity of standard mutagens was strongest in the cytokinesis-blocked micronucleus assay and in the thioguanine resistance test, and weakest in the sister chromatid exchange test. Fluphenazine also considerably reduced the level of free radicals estimated in in vitro samples of human granulocytes. The results suggest that, in the range of the tested concentrations, fluphenazine could be considered for use to prevent the genotoxicity of daunorubicin, methyl methanesulfonate, benzo[a]pyrene, and mitomycin C. Reduction in the level of free radicals appears to be an important mechanism of the antimutagenic action of fluphenazine.
Insights
Fluphenazine, an antipsychotic, demonstrated antimutagenic properties by reducing genotoxicity in various tests. This phenothiazine derivative also lowered free radical levels, suggesting a key mechanism for its protective effects against mutagens.
Area of Science:
- Pharmacology
- Genetics
- Toxicology
Background:
- Fluphenazine is a phenothiazine antipsychotic.
- Genotoxicity is a major concern in drug development and exposure.
- Understanding drug mechanisms against mutagens is crucial.
Purpose of the Study:
- To evaluate the antimutagenic potential of fluphenazine.
- To investigate the effect of fluphenazine on genotoxicity induced by various mutagens.
- To explore the role of free radical reduction in fluphenazine's action.
Main Methods:
- Ames test with direct and indirect mutagens.
- Short-term tests on human lymphocytes (micronucleus assay, thioguanine resistance, sister chromatid exchange).
- In vitro assessment of free radical levels in human granulocytes.
Main Results:
- Fluphenazine reduced genotoxicity in the Ames test.
- The strongest inhibitory effects were observed in the micronucleus assay and thioguanine resistance test.
- Fluphenazine significantly decreased free radical levels in human granulocytes.
Conclusions:
- Fluphenazine exhibits significant antimutagenic activity.
- It can potentially prevent genotoxicity from specific mutagens like daunorubicin and benzo[a]pyrene.
- Free radical scavenging is a likely mechanism underlying fluphenazine's protective effects.