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Time-lapse live cell imaging and flow analysis of multidrug resistance reversal by verapamil in bladder cancer cell lines

Research output: Contribution to journalArticlepeer-review

  • J. Featherstone
  • B. Lwaleed
  • A. Speers
  • M. Hayes
  • B. Birch
  • Alan Cooper
Objectives: To examine the effects of verapamil on the intracellular drug pharmacokinetics of epirubicin using alternative dosing schedules. The results might inform the choices for optimizing clinical chemotherapy. Methods: Sensitive parental (MGH-U1) and multidrug resistant (MDR) (MGH-U1R and MGH-U1-MMC) bladder cancer cell lines were used. Fluorescence time-lapsed studies were performed on cells incubated with epirubicin alone or combined with verapamil. Flow cytometry was performed after the alternative dosing regimens. Results: Verapamil reversed the epirubicin localization patterns in MDR cells. Time-lapse imaging showed that nuclear epirubicin accumulation in MDR cells with verapamil followed the parental curve. The maximal reversal took >60 minutes. Flow cytometry showed increased epirubicin uptake in MDR cells co-incubated with verapamil. Preincubation was not as effective as co-incubation. Conclusions: The results of our model indicate that longer exposure to MDR-class drugs, exemplified by epirubicin, increases uptake and the MDR reversing action of co-treatment with verapamil. The present results highlight the need for additional clinical trials of drug dosing and scheduling for combination intravesical chemotherapy regimens.
Original languageEnglish
Pages (from-to)378-384
Number of pages7
Issue number2
Publication statusPublished - Aug 2009

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