Inhibitory effect of alkylating modulators on the function of p-giycoprotein

Jin-Ming Yang, Gregory F. Sullivan, Darshan B. Makhey, Edmond J. Lavoie, William N. Hait

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Modulators of P-glycoprotein (P-gp) are often themselves transported out of cells, thereby limiting their effectiveness. It may be possible to develop more effective modulators of multidrug resistance by designing drugs that irreversibly block the function of P-gp. Therefore, we studied the effect of the mustard derivatives of fluphenazine (FPN) and /ronj-flupenthixol (FPT) on P-gp function. Both fluphenazine-mustard (FPN-M) and transflupenthixol-mustard (FPT-M) possessed alkylating activity, as assayed using 4-(p-nilrobenzyl) pyridine. Multidrugresistant MCF-7/AdrR cells were incubated with FPN or FPN-M, or FPT or FPT-M for 1 h, washed for varying number of times in phosphate-buffered saline (PBS), then resuspended in medium containing ['HJvinblastine (VBL), and assayed for steady-state accumulation of the drug. Washing had far less of an effect on the ability of FPN-M and FPT-M to increase VBL accumulation compared to their parent compounds. After eight washes in excess PBS, the cells initially exposed to FPN or FPT accumulated only 30% and 50% of the initially accumulated drug, whereas the FPN-M- or FPT-M-treated cells accumulated approximately 75% and 90% of the control, respectively. FPN-M and FPT-M also increased the uptake and decreased the efflux of VBL from MDR cells despite repeated washing. We also examined the effects of these modulators on sensitivity of MDR cells to cytotoxic agents. FPN-M and FPT-M sensitized MCF-7/AdrR cells to VBL and doxorubicin to a greater extent than their parent compounds. These studies point out the potential of irreversible P-gp modulators to produce prolonged chemosensitization.

Original languageEnglish (US)
Pages (from-to)477-484
Number of pages8
JournalOncology Research
Volume9
Issue number9
StatePublished - Dec 1 1997

Fingerprint

Fluphenazine
Flupenthixol
P-Glycoprotein
Mustard Plant
MCF-7 Cells
Phosphates
Pharmaceutical Preparations
Cytotoxins
Multiple Drug Resistance
Doxorubicin

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

Cite this

Yang, J-M., Sullivan, G. F., Makhey, D. B., Lavoie, E. J., & Hait, W. N. (1997). Inhibitory effect of alkylating modulators on the function of p-giycoprotein. Oncology Research, 9(9), 477-484.
Yang, Jin-Ming ; Sullivan, Gregory F. ; Makhey, Darshan B. ; Lavoie, Edmond J. ; Hait, William N. / Inhibitory effect of alkylating modulators on the function of p-giycoprotein. In: Oncology Research. 1997 ; Vol. 9, No. 9. pp. 477-484.
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Yang, J-M, Sullivan, GF, Makhey, DB, Lavoie, EJ & Hait, WN 1997, 'Inhibitory effect of alkylating modulators on the function of p-giycoprotein', Oncology Research, vol. 9, no. 9, pp. 477-484.

Inhibitory effect of alkylating modulators on the function of p-giycoprotein. / Yang, Jin-Ming; Sullivan, Gregory F.; Makhey, Darshan B.; Lavoie, Edmond J.; Hait, William N.

In: Oncology Research, Vol. 9, No. 9, 01.12.1997, p. 477-484.

Research output: Contribution to journalArticle

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Yang J-M, Sullivan GF, Makhey DB, Lavoie EJ, Hait WN. Inhibitory effect of alkylating modulators on the function of p-giycoprotein. Oncology Research. 1997 Dec 1;9(9):477-484.