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OtherShort Communication

EFFECT OF RECOMBINANT INTERLEUKIN-2 PRETREATMENT ON ORAL AND INTRAVENOUS DIGOXIN PHARMACOKINETICS AND P-GLYCOPROTEIN ACTIVITY IN MICE

Vincent Castagne, Laurence Bonhomme-Faivre, Saik Urien, Makram Ben Reguiga, Mireille Soursac, Francois Gimenez and Robert Farinotti
Drug Metabolism and Disposition February 2004, 32 (2) 168-171; DOI: https://doi.org/10.1124/dmd.32.2.168
Vincent Castagne
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Laurence Bonhomme-Faivre
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Saik Urien
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Makram Ben Reguiga
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Mireille Soursac
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Francois Gimenez
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Robert Farinotti
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Abstract

P-glycoprotein (P-gp) is an ATP-dependent efflux membrane transporter involved in many drug pharmacokinetics in humans. Decreasing its expression could enhance the bioavailability of substrates as digoxin. We have recently found that human recombinant interleukin-2 (rIL2) in vivo decreases P-gp expression in intestine and brain of mice and modifies oral digoxin pharmacokinetics. The aim of the study was to evaluate the involvement of bioavailability in the rIL2 pretreatment effect on digoxin pharmacokinetics by comparing oral and i.v. digoxin pharmacokinetics before and after rIL2 pretreatment (10 μg/kg). We also tried to show the possible effect of a low rIL2 dose (1 μg/kg) pretreatment on oral digoxin pharmacokinetics. First, adult Swiss mice received a single oral or i.v. dose of digoxin (0.03 mg/kg). Two weeks later, the same animals were treated by rIL2 i.p. twice a day (10 μg/kg) for 4 days and received digoxin again at day 5. As well, another group received oral digoxin (0.03 mg/kg) with a 1 μg/kg rIL2 pretreatment. Blood was collected after digoxin administration with and without rIL2 pretreatment. Digoxin pharmacokinetics were described by a one-compartment model. The 10 μg/kg rIL2 pretreatment did not modify i.v. digoxin pharmacokinetics, whereas oral digoxin pharmacokinetics were significantly modified by the 10 μg/kg rIL2 pretreatment and not by the 1 μg/kg rIL2 pretreatment. The decrease of P-gp activity, caused by rIL2 (10 μg/kg), increased digoxin bioavailability. An increase in exposure and intracellular level of drugs is expected from rIL2 pretreatment.

Footnotes

  • ↵1 Abbreviations used are: P-gp, P-glycoprotein; rIL2, human recombinant interleukin-2; AUC, area under the curve.

    • Received May 5, 2003.
    • Accepted November 4, 2003.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 32 (2)
Drug Metabolism and Disposition
Vol. 32, Issue 2
1 Feb 2004
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OtherShort Communication

EFFECT OF RECOMBINANT INTERLEUKIN-2 PRETREATMENT ON ORAL AND INTRAVENOUS DIGOXIN PHARMACOKINETICS AND P-GLYCOPROTEIN ACTIVITY IN MICE

Vincent Castagne, Laurence Bonhomme-Faivre, Saik Urien, Makram Ben Reguiga, Mireille Soursac, Francois Gimenez and Robert Farinotti
Drug Metabolism and Disposition February 1, 2004, 32 (2) 168-171; DOI: https://doi.org/10.1124/dmd.32.2.168

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OtherShort Communication

EFFECT OF RECOMBINANT INTERLEUKIN-2 PRETREATMENT ON ORAL AND INTRAVENOUS DIGOXIN PHARMACOKINETICS AND P-GLYCOPROTEIN ACTIVITY IN MICE

Vincent Castagne, Laurence Bonhomme-Faivre, Saik Urien, Makram Ben Reguiga, Mireille Soursac, Francois Gimenez and Robert Farinotti
Drug Metabolism and Disposition February 1, 2004, 32 (2) 168-171; DOI: https://doi.org/10.1124/dmd.32.2.168
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