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P-glycoprotein activity and biological response.

W Vaalburg1, N H Hendrikse, P H Elsinga

  • 1Groningen University Hospital, PO Box 30.001, 9700 RB Groningen, The Netherlands. w.vaalburg@pet.umcg.nl

Toxicology and Applied Pharmacology
|July 27, 2005
PubMed
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P-glycoprotein (P-gp) is a key drug efflux pump contributing to multidrug resistance (MDR) in tumors. Positron emission tomography (PET) can visualize P-gp function and assess drug resistance modulation.

Area of Science:

  • Pharmacology and Molecular Biology
  • Oncology
  • Radiochemistry

Background:

  • P-glycoprotein (P-gp), encoded by the MDR-1 gene, acts as a transmembrane drug efflux pump, protecting organs from toxins.
  • P-gp expression in the blood-brain barrier affects drug distribution, and its role in multidrug resistance (MDR) is extensively studied.
  • Tumor MDR, characterized by resistance to multiple chemotherapeutics, can be mediated by P-gp's extrusion of drugs from cancer cells.

Purpose of the Study:

  • To investigate P-glycoprotein (P-gp) functionality and its impact on drug pharmacokinetics using in vivo imaging.
  • To evaluate the efficacy of P-gp modulators in altering drug bioavailability and overcoming multidrug resistance (MDR).
  • To explore the potential of positron emission tomography (PET) in assessing P-gp's role in drug resistance and response to modulators.

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Main Methods:

  • Utilized positron emission tomography (PET) with carbon-11 and fluorine-18 labeled P-gp substrates and modulators for in vivo studies.
  • Investigated the effect of P-gp modulators, including verapamil, cyclosporin A, ONT-093, and XR9576, on P-gp functionality.
  • Assessed drug pharmacokinetics and bioavailability in humans in vivo by measuring tissue concentrations using PET.

Main Results:

  • PET imaging demonstrated the ability to study P-gp functionality and its impact on drug pharmacokinetics in vivo.
  • The study showed that P-gp modulators can alter drug bioavailability, suggesting potential for overcoming drug resistance.
  • PET allows for the in vivo measurement of the efficacy of novel P-gp modulators in human subjects.

Conclusions:

  • Positron emission tomography (PET) is a valuable tool for studying P-glycoprotein (P-gp) function and drug pharmacokinetics in vivo.
  • P-gp modulation holds promise for enhancing chemotherapy efficacy by increasing intracellular drug concentrations in tumors.
  • PET imaging can guide the development and clinical application of P-gp modulators for cancer treatment.