Abstract:
:ABCG2 (also called MXR (3), BCRP (4), or ABCP (5) is a recently-identified ABC half-transporter, which causes multidrug resistance in cancer. Here we report that the expression of the ABCG2 protein in Sf9 insect cells resulted in a high-capacity, vanadate-sensitive ATPase activity in isolated membrane preparations. ABCG2 was expressed underglycosylated, and its ATPase activity was stimulated by daunorubicin, doxorubicin, mitoxantrone, prazosin and rhodamine 123, compounds known to be transported by this protein. ABCG2-ATPase was inhibited by low concentrations of Na-orthovanadate, N-ethylmaleimide and cyclosporin A. Verapamil had no effect, while Fumitremorgin C, reversing ABCG2-dependent cancer drug resistance, strongly inhibited this ATPase activity. The functional expression of ABCG2 in this heterologous system indicates that no additional partner protein is required for the activity of this multidrug transporter, probably working as a homodimer. We suggest that the Sf9 cell membrane ATPase system is an efficient tool for examining the interactions of ABCG2 with pharmacological agents.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Ozvegy C,Litman T,Szakács G,Nagy Z,Bates S,Váradi A,Sarkadi Bdoi
10.1006/bbrc.2001.5130subject
Has Abstractpub_date
2001-07-06 00:00:00pages
111-7issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(01)95130-7journal_volume
285pub_type
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