Ascorbic acid and cell survival of adriamycin resistant and sensitive MCF-7 breast tumor cells.
Identifieur interne : 001232 ( Main/Exploration ); précédent : 001231; suivant : 001233Ascorbic acid and cell survival of adriamycin resistant and sensitive MCF-7 breast tumor cells.
Auteurs : W W Wells [États-Unis] ; P A Rocque ; D P Xu ; E B Meyer ; L J Charamella ; N V DimitrovSource :
- Free radical biology & medicine [ 0891-5849 ] ; 1995.
Descripteurs français
- KwdFr :
- Acide ascorbique (MeSH), Animaux (MeSH), Cellules cultivées (effets des médicaments et des substances chimiques), Doxorubicine (pharmacologie), Glutarédoxines (MeSH), Humains (MeSH), Oxidoreductases (MeSH), Protéines (MeSH), Rats (MeSH), Relation dose-effet des médicaments (MeSH), Survie cellulaire (MeSH), Technique de Western (MeSH), Tumeurs du sein (MeSH).
- MESH :
- effets des médicaments et des substances chimiques : Cellules cultivées.
- pharmacologie : Doxorubicine.
- Acide ascorbique, Animaux, Glutarédoxines, Humains, Oxidoreductases, Protéines, Rats, Relation dose-effet des médicaments, Survie cellulaire, Technique de Western, Tumeurs du sein.
English descriptors
- KwdEn :
- Animals (MeSH), Ascorbic Acid (MeSH), Blotting, Western (MeSH), Breast Neoplasms (MeSH), Cell Survival (MeSH), Cells, Cultured (drug effects), Dose-Response Relationship, Drug (MeSH), Doxorubicin (pharmacology), Glutaredoxins (MeSH), Humans (MeSH), Oxidoreductases (MeSH), Proteins (MeSH), Rats (MeSH).
- MESH :
- chemical , pharmacology : Doxorubicin.
- chemical : Ascorbic Acid, Glutaredoxins, Oxidoreductases, Proteins.
- drug effects : Cells, Cultured.
- Animals, Blotting, Western, Breast Neoplasms, Cell Survival, Dose-Response Relationship, Drug, Humans, Rats.
Abstract
The ability of human cells to regenerate ascorbic acid from dehydroascorbate is partially dependent on the glutathione redox status of the cell and the relative activity of dehydroascorbate reductases. Mammalian dehydroascorbate reductase activity is associated with two proteins known as thioltransferase (glutaredoxin) and protein disulfide isomerase. We compared the specific activity of thioltransferase, protein disulfide isomerase, and other GSH-related enzymes in Adriamycin-resistant human breast tumor cells, MCF-7 ADRR, and Adriamycin-sensitive, MCF-7 WT, tumor cells. MCF-7 ADRR cells had higher activities of glutathione peroxidase (34.7 fold), nonseleno-glutathione peroxidase (glutathione S-transferases; 5.3 fold), thioredoxin (2.3 fold), and thioltransferase (4.0 fold) compared with the WT Adriamycin-sensitive cell line. Thioltransferase was detected in Western blots in extracts of ADRR MCF-7 cells but not in WT MCF-7 cells. alpha-Tocopherol in the membrane and cytosolic fractions was 2.8 and 3.0 fold higher, respectively, in Adriamycin-resistant compared with Adriamycin-sensitive cells. Supplementation of MCF-7 cells with L-ascorbic acid 2-phosphate (2 and 10 mM) had no effect on WT cell viability after 5 days incubation with up to 0.33 microM Adriamycin. In contrast, supplementation of ADRR MCF-7 cells with L-ascorbic acid 2-phosphate resulted in enhanced resistance up to 3.4 microM Adriamycin over a 5-day incubation. Both lines of MCF-7 cells demonstrated the ability to utilize ascorbic acid as the 2-phosphate derivative. After 48 h incubation with 8.6 microM Adriamycin, the resistant cells maintained normal viability and ascorbate-dehydroascorbate levels, whereas drug-sensitive cells had significantly lower ascorbate with a higher percent dehydroascorbate and increased cell death as judged by cell protein levels (52% of controls).
DOI: 10.1016/0891-5849(94)00188-p
PubMed: 7750794
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Ascorbic Acid (MeSH)</term>
<term>Blotting, Western (MeSH)</term>
<term>Breast Neoplasms (MeSH)</term>
<term>Cell Survival (MeSH)</term>
<term>Cells, Cultured (drug effects)</term>
<term>Dose-Response Relationship, Drug (MeSH)</term>
<term>Doxorubicin (pharmacology)</term>
<term>Glutaredoxins (MeSH)</term>
<term>Humans (MeSH)</term>
<term>Oxidoreductases (MeSH)</term>
<term>Proteins (MeSH)</term>
<term>Rats (MeSH)</term>
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<term>Animaux (MeSH)</term>
<term>Cellules cultivées (effets des médicaments et des substances chimiques)</term>
<term>Doxorubicine (pharmacologie)</term>
<term>Glutarédoxines (MeSH)</term>
<term>Humains (MeSH)</term>
<term>Oxidoreductases (MeSH)</term>
<term>Protéines (MeSH)</term>
<term>Rats (MeSH)</term>
<term>Relation dose-effet des médicaments (MeSH)</term>
<term>Survie cellulaire (MeSH)</term>
<term>Technique de Western (MeSH)</term>
<term>Tumeurs du sein (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en"><term>Doxorubicin</term>
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<term>Glutaredoxins</term>
<term>Oxidoreductases</term>
<term>Proteins</term>
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<front><div type="abstract" xml:lang="en">The ability of human cells to regenerate ascorbic acid from dehydroascorbate is partially dependent on the glutathione redox status of the cell and the relative activity of dehydroascorbate reductases. Mammalian dehydroascorbate reductase activity is associated with two proteins known as thioltransferase (glutaredoxin) and protein disulfide isomerase. We compared the specific activity of thioltransferase, protein disulfide isomerase, and other GSH-related enzymes in Adriamycin-resistant human breast tumor cells, MCF-7 ADRR, and Adriamycin-sensitive, MCF-7 WT, tumor cells. MCF-7 ADRR cells had higher activities of glutathione peroxidase (34.7 fold), nonseleno-glutathione peroxidase (glutathione S-transferases; 5.3 fold), thioredoxin (2.3 fold), and thioltransferase (4.0 fold) compared with the WT Adriamycin-sensitive cell line. Thioltransferase was detected in Western blots in extracts of ADRR MCF-7 cells but not in WT MCF-7 cells. alpha-Tocopherol in the membrane and cytosolic fractions was 2.8 and 3.0 fold higher, respectively, in Adriamycin-resistant compared with Adriamycin-sensitive cells. Supplementation of MCF-7 cells with L-ascorbic acid 2-phosphate (2 and 10 mM) had no effect on WT cell viability after 5 days incubation with up to 0.33 microM Adriamycin. In contrast, supplementation of ADRR MCF-7 cells with L-ascorbic acid 2-phosphate resulted in enhanced resistance up to 3.4 microM Adriamycin over a 5-day incubation. Both lines of MCF-7 cells demonstrated the ability to utilize ascorbic acid as the 2-phosphate derivative. After 48 h incubation with 8.6 microM Adriamycin, the resistant cells maintained normal viability and ascorbate-dehydroascorbate levels, whereas drug-sensitive cells had significantly lower ascorbate with a higher percent dehydroascorbate and increased cell death as judged by cell protein levels (52% of controls).</div>
</front>
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<Abstract><AbstractText>The ability of human cells to regenerate ascorbic acid from dehydroascorbate is partially dependent on the glutathione redox status of the cell and the relative activity of dehydroascorbate reductases. Mammalian dehydroascorbate reductase activity is associated with two proteins known as thioltransferase (glutaredoxin) and protein disulfide isomerase. We compared the specific activity of thioltransferase, protein disulfide isomerase, and other GSH-related enzymes in Adriamycin-resistant human breast tumor cells, MCF-7 ADRR, and Adriamycin-sensitive, MCF-7 WT, tumor cells. MCF-7 ADRR cells had higher activities of glutathione peroxidase (34.7 fold), nonseleno-glutathione peroxidase (glutathione S-transferases; 5.3 fold), thioredoxin (2.3 fold), and thioltransferase (4.0 fold) compared with the WT Adriamycin-sensitive cell line. Thioltransferase was detected in Western blots in extracts of ADRR MCF-7 cells but not in WT MCF-7 cells. alpha-Tocopherol in the membrane and cytosolic fractions was 2.8 and 3.0 fold higher, respectively, in Adriamycin-resistant compared with Adriamycin-sensitive cells. Supplementation of MCF-7 cells with L-ascorbic acid 2-phosphate (2 and 10 mM) had no effect on WT cell viability after 5 days incubation with up to 0.33 microM Adriamycin. In contrast, supplementation of ADRR MCF-7 cells with L-ascorbic acid 2-phosphate resulted in enhanced resistance up to 3.4 microM Adriamycin over a 5-day incubation. Both lines of MCF-7 cells demonstrated the ability to utilize ascorbic acid as the 2-phosphate derivative. After 48 h incubation with 8.6 microM Adriamycin, the resistant cells maintained normal viability and ascorbate-dehydroascorbate levels, whereas drug-sensitive cells had significantly lower ascorbate with a higher percent dehydroascorbate and increased cell death as judged by cell protein levels (52% of controls).</AbstractText>
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