Biochem Biophys Res Commun. 1995 Jul 17;212(2):494-500.

Immune response against the murine mdri protein induced by vaccination with synthetic lipopeptides in liposomes.

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Center for Blood Research Laboratories, Boston, MA 02135, USA.

Abstract

Intrinsically, or after exposure to chemotherapeutic drugs, many cancer cells overexpress a class of high molecular weight membrane glycoproteins associated with the multidrug resistance (mdr) of these cells. This report describes an immunization protocol eliciting autoantibodies specific to extracellular epitopes of the murine mdr 1 P-glycoprotein (Pgp). Synthetic peptides with the sequences of extracellular loops of murine Pgp were covalently coupled with four palmitic acid moieties per peptide molecule. These "lipopeptides" were reconstituted in the bilayer of liposomes containing lipid A and used to immunize mice. Antibodies against the lipopeptides corresponding to loop 2 and 4 were elicited in sera of immunized mice. They reacted specifically with extracellular epitopes of the naturally occurring murine Pgp. After interaction with resistant cancer cells, the antibodies induced an average 50% increase in cellular accumulation of doxorubicin and Bodipy-verapamil. In the presence of these antibodies the resistance of L1210 mdr cells was reduced from an LD50 of 4 x 10(-5) M to 5 x 10(-7) M doxorubicin.

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