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Microbial Metabolism of Atovaquone and Cytotoxicity of the Produced Phase I Metabolite.

Identifieur interne : 000F18 ( Main/Exploration ); précédent : 000F17; suivant : 000F19

Microbial Metabolism of Atovaquone and Cytotoxicity of the Produced Phase I Metabolite.

Auteurs : Eliane De Oliveira Silva [Brésil] ; Natália Dos Santos Gonçalves [Brésil] ; Raquel Alves Dos Santos [Brésil] ; Niege Araçari Jacometti Cardoso Furtado [Brésil]

Source :

RBID : pubmed:26253156

Descripteurs français

English descriptors

Abstract

BACKGROUND AND OBJECTIVES

Atovaquone is a hydroxynaphthoquinone with selective action in the mitochondrial respiratory chain of malaria parasite. It is employed for both the treatment and prevention of malaria, in a combination with proguanil. The aim of this study was to elucidate the in vitro metabolites from atovaquone and to evaluate their cytotoxic activities.

METHODS

The biotransformation of atovaquone was performed using Mucor rouxii NRRL 1894, Cunninghamella echinulata var. elegans ATCC 8688a and C. elegans ATCC 10028b, which have been reported as microbial models of mammalian drug metabolism. Experiments were also carried out with two probiotic strains from the human intestinal tract: Bifidobacterium sp. and Lactobacillus acidophilus. The phase I metabolite was isolated, its chemical structure was elucidated and its toxicity was evaluated using the neoplastic cell line SKBR-3 derived from human breast cancer and normal human fibroblast cell line GM07492-A. Cell cytotoxicity assays were also carried out with atovaquone.

RESULT

Only the fungi were able to convert atovaquone to metabolite trans-3-[4'-(4″-chlorophenyl)cyclohexyl)-1,2-dioxo-dihydro-1H-indene-3-carboxylic acid. The metabolite displayed 50 % inhibitory concentration (IC50) values of 110.20 ± 2.2 and 108.80 ± 1.5 µmol/L against breast cancer cell line SKBR-3 and fibroblasts cell line GM07492-A, respectively. The IC50 values of atovaquone were 282.30 ± 1.8 and 340.50 ± 1.4 µmol/L against breast cancer and normal fibroblasts cell lines, respectively.

CONCLUSIONS

The produced metabolite was more toxic than atovaquone and was not selective to normal or cancer cell lines. The present study is the first to report the production of atovaquone metabolite.


DOI: 10.1007/s13318-015-0294-1
PubMed: 26253156


Affiliations:


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Le document en format XML

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<term>Animals (MeSH)</term>
<term>Antimalarials (metabolism)</term>
<term>Antimalarials (pharmacology)</term>
<term>Atovaquone (metabolism)</term>
<term>Atovaquone (pharmacology)</term>
<term>Breast Neoplasms (metabolism)</term>
<term>Caenorhabditis elegans (drug effects)</term>
<term>Cell Line (MeSH)</term>
<term>Cell Line, Tumor (MeSH)</term>
<term>Female (MeSH)</term>
<term>Fibroblasts (metabolism)</term>
<term>Fungi (drug effects)</term>
<term>Humans (MeSH)</term>
<term>Inhibitory Concentration 50 (MeSH)</term>
<term>Malaria, Falciparum (drug therapy)</term>
<term>Metabolic Detoxication, Phase I (physiology)</term>
<term>Proguanil (metabolism)</term>
<term>Proguanil (pharmacology)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr">
<term>Animaux (MeSH)</term>
<term>Antipaludiques (métabolisme)</term>
<term>Antipaludiques (pharmacologie)</term>
<term>Atovaquone (métabolisme)</term>
<term>Atovaquone (pharmacologie)</term>
<term>Caenorhabditis elegans (effets des médicaments et des substances chimiques)</term>
<term>Champignons (effets des médicaments et des substances chimiques)</term>
<term>Concentration inhibitrice 50 (MeSH)</term>
<term>Détoxication de phase I (physiologie)</term>
<term>Femelle (MeSH)</term>
<term>Fibroblastes (métabolisme)</term>
<term>Humains (MeSH)</term>
<term>Lignée cellulaire (MeSH)</term>
<term>Lignée cellulaire tumorale (MeSH)</term>
<term>Paludisme à Plasmodium falciparum (traitement médicamenteux)</term>
<term>Proguanil (métabolisme)</term>
<term>Proguanil (pharmacologie)</term>
<term>Tumeurs du sein (métabolisme)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Antimalarials</term>
<term>Atovaquone</term>
<term>Proguanil</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en">
<term>Antimalarials</term>
<term>Atovaquone</term>
<term>Proguanil</term>
</keywords>
<keywords scheme="MESH" qualifier="drug effects" xml:lang="en">
<term>Caenorhabditis elegans</term>
<term>Fungi</term>
</keywords>
<keywords scheme="MESH" qualifier="drug therapy" xml:lang="en">
<term>Malaria, Falciparum</term>
</keywords>
<keywords scheme="MESH" qualifier="effets des médicaments et des substances chimiques" xml:lang="fr">
<term>Caenorhabditis elegans</term>
<term>Champignons</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en">
<term>Breast Neoplasms</term>
<term>Fibroblasts</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Antipaludiques</term>
<term>Atovaquone</term>
<term>Fibroblastes</term>
<term>Proguanil</term>
<term>Tumeurs du sein</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr">
<term>Antipaludiques</term>
<term>Atovaquone</term>
<term>Proguanil</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr">
<term>Détoxication de phase I</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en">
<term>Metabolic Detoxication, Phase I</term>
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<keywords scheme="MESH" qualifier="traitement médicamenteux" xml:lang="fr">
<term>Paludisme à Plasmodium falciparum</term>
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<term>Animals</term>
<term>Cell Line</term>
<term>Cell Line, Tumor</term>
<term>Female</term>
<term>Humans</term>
<term>Inhibitory Concentration 50</term>
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<term>Animaux</term>
<term>Concentration inhibitrice 50</term>
<term>Femelle</term>
<term>Humains</term>
<term>Lignée cellulaire</term>
<term>Lignée cellulaire tumorale</term>
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<p>
<b>BACKGROUND AND OBJECTIVES</b>
</p>
<p>Atovaquone is a hydroxynaphthoquinone with selective action in the mitochondrial respiratory chain of malaria parasite. It is employed for both the treatment and prevention of malaria, in a combination with proguanil. The aim of this study was to elucidate the in vitro metabolites from atovaquone and to evaluate their cytotoxic activities.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>METHODS</b>
</p>
<p>The biotransformation of atovaquone was performed using Mucor rouxii NRRL 1894, Cunninghamella echinulata var. elegans ATCC 8688a and C. elegans ATCC 10028b, which have been reported as microbial models of mammalian drug metabolism. Experiments were also carried out with two probiotic strains from the human intestinal tract: Bifidobacterium sp. and Lactobacillus acidophilus. The phase I metabolite was isolated, its chemical structure was elucidated and its toxicity was evaluated using the neoplastic cell line SKBR-3 derived from human breast cancer and normal human fibroblast cell line GM07492-A. Cell cytotoxicity assays were also carried out with atovaquone.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>RESULT</b>
</p>
<p>Only the fungi were able to convert atovaquone to metabolite trans-3-[4'-(4″-chlorophenyl)cyclohexyl)-1,2-dioxo-dihydro-1H-indene-3-carboxylic acid. The metabolite displayed 50 % inhibitory concentration (IC50) values of 110.20 ± 2.2 and 108.80 ± 1.5 µmol/L against breast cancer cell line SKBR-3 and fibroblasts cell line GM07492-A, respectively. The IC50 values of atovaquone were 282.30 ± 1.8 and 340.50 ± 1.4 µmol/L against breast cancer and normal fibroblasts cell lines, respectively.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>CONCLUSIONS</b>
</p>
<p>The produced metabolite was more toxic than atovaquone and was not selective to normal or cancer cell lines. The present study is the first to report the production of atovaquone metabolite.</p>
</div>
</front>
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<AbstractText Label="CONCLUSIONS" NlmCategory="CONCLUSIONS">The produced metabolite was more toxic than atovaquone and was not selective to normal or cancer cell lines. The present study is the first to report the production of atovaquone metabolite.</AbstractText>
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