Inhibitory Effect of Dextran Derivatives on Multidrug Resistance-Related Efflux Transporters in Vitro

Kaori Morimoto, Makoto Ishii, Yoshikazu Sugimoto, Takuo Ogihara, Mikio Tomita

Research output: Contribution to journalArticlepeer-review


Dextran is a promising candidate as a nanocarrier of chemotherapeutic drugs due to its biocompatibility, biodegradability, and ability to accumulate in tumors. Furthermore, dextran derivatives interact with P-glycoprotein (P-gp), so we hypothesized that they may be available as tumor-specific drug delivery systems with the ability to reverse multidrug resistance. Here, to test this idea, we investigated whether dextran and its derivatives inhibit breast cancer resistance protein (BCRP), multidrug resistance associated protein 1 (MRP1), and P-gp in vitro. First, we examined their effect on the uptake of specific fluorescent substrates by inside-out Sf-9 membrane vesicles overexpressing BCRP, MRP1, and P-gp. BCRP and MRP1 were significantly inhibited by 2-hydroxypropyl-trimethylammonium-dextran of 4 and 70kDa (Q-D4 and Q-D70) at a concentration near the clinically used concentration of dextran; however, P-gp was not inhibited. A structure–activity study showed that Q-D4, Q-D70, and 40kDa diethylaminoethyl-dextran (DEAE-D40) significantly inhibited BCRP, while 4, 40, and 70kDa dextrans (D4, D40, and D70), dextran sulfate (Sul-D40), and the individual saccharide components of dextran did not. These results suggest that the cationic side chains, but not the saccharides, are important for BCRP inhibition. Finally, cell-based efflux assay was conducted. Q-D4, Q-D70, and DEAE-D40 did not specifically increase the retention of Hoechst33342 in BCRP-overexpressing KB cells. Similarly, Q-D4 and Q-D70 did not affect the intracellular retention of specific fluorescent substrates in MRP1- and P-gp-overexpressing KB cells. The ineffectiveness in cellular systems is presumably due to inability of the dextran derivatives to access transporters located on the cytoplasmic side of the cell membrane.

Original languageEnglish
Pages (from-to)1036-1042
Number of pages7
JournalBiological and Pharmaceutical Bulletin
Issue number8
Publication statusPublished - 2022 Aug


  • P-glycoprotein
  • breast cancer resistance protein (BCRP)
  • dextran derivative
  • multidrug resistance associated protein 1 (MRP1)

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science


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