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Molecular Pharmacology

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Research ArticleArticle

Cellular Response to a Glutathione S-Transferase P1-1 Activated Prodrug

Lilliam A. Rosario, Miechelle L. O'Brien, Colin J. Henderson, C. Roland Wolf and Kenneth D. Tew
Molecular Pharmacology July 2000, 58 (1) 167-174; DOI: https://doi.org/10.1124/mol.58.1.167
Lilliam A. Rosario
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Miechelle L. O'Brien
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Colin J. Henderson
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C. Roland Wolf
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Kenneth D. Tew
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Abstract

TER286 [γ-glutamyl-α-amino-β(2-ethyl-N,N,N′,N′-tetrakis(2-chloroethyl)phosphorodiamidate)-sulfonyl-propionyl-(R)-(−) phenylglycine] is a novel nitrogen mustard prodrug that is preferentially activated by glutathione S-transferase P1-1 (GSTP1-1). A human promyelocytic leukemia /TER286-resistant cell line was selected by chronic, long-term exposure to the prodrug. Although resistance was not readily achieved, eventually a 5-fold resistant clone was isolated. Cross-resistance to melphalan occurred, but not to doxorubicin (Adriamycin), taxol, and γ-glutamyl-S-(benzyl)cysteinyl-R(−)-phenyl glycine diethyl ester, a GSTP1-1 inhibitor. The protein and transcript levels and enzymatic activity of GSTP1-1 were reduced significantly in the selected resistant line. GSTα levels were unchanged, and GSTμ was undetectable. Although glutathione levels were elevated in human promyelocytic leukemia/TER286 cells, no changes in the expression of thiol-related genes including γ-glutamylcysteine synthetase, γ-glutamyl transpeptidase, or multidrug resistance protein were found. A 7-fold increase in catalase expression in the resistant cell line indicated an adaptive response to oxidative and electrophilic stress, and this was also reflected in the lower prevalence of drug-induced DNA single-strand breaks in the resistant cells. Mouse embryo fibroblast GSTP1-1−/− cells exhibited 2-fold resistance to TER286 compared with GSTP1-1+/+ cells. NIH3T3 cells transfected with combinations of γ-GCS and multidrug resistance protein exhibited enhanced resistance to TER286, although the degree of resistance was impaired by cotransfection of GSTP1-1. These results are consistent with responses in the TER286-resistant cells indicative of GSTP1-1-mediated mechanism of activation. In consequence, these data support the rationale that tumors expressing high levels of GSTP1-1 will be more sensitive to the cytotoxic effects of the drug.

Footnotes

    • Received November 8, 1999.
    • Accepted March 27, 2000.
  • Kenneth D. Tew, Department of Pharmacology, Fox Chase Cancer Center, 7701 Burholme Ave., Philadelphia, PA 19111. E-mail:kd_tew{at}fccc.edu

  • This work was supported in part by National Institutes of Health Grants CA06927 and RR05539, NIH Grant CA53893 (to K.D.T.), and appropriation from the Commonwealth of Pennsylvania.

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 58 (1)
Molecular Pharmacology
Vol. 58, Issue 1
1 Jul 2000
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Research ArticleArticle

Cellular Response to a Glutathione S-Transferase P1-1 Activated Prodrug

Lilliam A. Rosario, Miechelle L. O'Brien, Colin J. Henderson, C. Roland Wolf and Kenneth D. Tew
Molecular Pharmacology July 1, 2000, 58 (1) 167-174; DOI: https://doi.org/10.1124/mol.58.1.167

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Research ArticleArticle

Cellular Response to a Glutathione S-Transferase P1-1 Activated Prodrug

Lilliam A. Rosario, Miechelle L. O'Brien, Colin J. Henderson, C. Roland Wolf and Kenneth D. Tew
Molecular Pharmacology July 1, 2000, 58 (1) 167-174; DOI: https://doi.org/10.1124/mol.58.1.167
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