Inhibition of multidrug resistance-associated protein (MRP) functional activity with pluronic block copolymers.

Abstract:

PURPOSE:Using monolayers of human pancreatic adenocarcinoma cells (Panc-1) that express multidrug resistance-associated protein (MRP), the present work investigates the effects of Pluronic block copolymers on the functional activity of MRP. METHODS:The studies examined the accumulation and efflux of the MRP selective probe fluorescein (FLU) in Panc-1 cell monolayers with and without Pluronic P85 (P85), Pluronic L81 (L81) and Pluronic F108 (F108). RESULTS:Treatment of Panc-1 cells with P85 resulted in concentration-dependent increases in FLU accumulation and elimination of FLU sequestration in vesicular compartments in these cells. The effects of P85 were selective for FLU in the Panc-1 cell monolayers. Inhibition of MRP-mediated transport was dependent on the composition of Pluronic block copolymer: the more hydrophobic copolymer had the greater effect on FLU uptake in Panc-1 monolayers (L81 > P85 > F108). CONCLUSIONS:This paper demonstrates for the first time that Pluronic block copolymers inhibit multidrug resistance-associated protein (MRP). The similarities in the effects of Pluronic block copolymers on MRP and P-glycoprotein drug efflux systems suggest that a single unifying mechanism may explain the inhibition observed.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Miller DW,Batrakova EV,Kabanov AV

doi

10.1023/a:1018873702411

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

396-401

issue

3

eissn

0724-8741

issn

1573-904X

journal_volume

16

pub_type

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