Targeting multidrug resistant tumor cells with a recombinant single-chain FV fragment directed to P-glycoprotein.

Abstract:

:The MDR1 gene product P-glycoprotein (Pgp) plays a key role in multidrug resistance of cancer cells. Pgp is an ATP-driven efflux pump that extrudes a variety of dissimilar hydrophobic cytotoxic compounds. P-glycoprotein overexpression results in multidrug resistance (MDR) of tumor cell lines in vitro as well as in cancer patients. To selectively target and eliminate MDR tumor cells, we have isolated a monoclonal antibody that specifically reacts with the first extracellular loop of the human Pgp. We have cloned the variable domain genes of this antibody and assembled a functional single-chain Fv fragment capable of specifically targeting various Pgp-expressing MDR carcinoma cells lines. Targeting and specific elimination of Pgp-dependent MDR human cancer cells was achieved by constructing a single-chain immunotoxin in which the scFv fragment was fused to a truncated form of Pseudomonas exotoxin (PE38). We conclude that recombinant Fv-immunotoxins or other Fv-based molecules armed with potent cytotoxins represent an effective tool in targeted cancer therapy aimed at specific elimination of MDR tumor cell sub-populations. Recombinant antibody fragments targeting MDR proteins such as Pgp may be also used for intracellular expression and consequent phenotypic knockout of MDR.

journal_name

Int J Cancer

authors

Niv R,Assaraf YG,Segal D,Pirak E,Reiter Y

doi

10.1002/ijc.1552

keywords:

subject

Has Abstract

pub_date

2001-12-15 00:00:00

pages

864-72

issue

6

eissn

0020-7136

issn

1097-0215

pii

10.1002/ijc.1552

journal_volume

94

pub_type

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