Abstract：
:It has been suggested that P-glycoprotein (P-gp), an ATP-dependent transporter responsible for classical multidrug resistance, is also a volume-regulated chloride channel. We reexamined this hypothesis by use of whole-cell patch clamp recordings of three matched pairs of cell lines, which were either drug-sensitive or drug-resistant due to P-gp overexpression. We demonstrate here that volume-regulated chloride-selective currents can be induced in cells with or without P-gp expression. Overexpression of either P-gp or cystic fibrosis transmembrane conductance regulator, the protein product of the CF gene and another member of the ATP-dependent transporters, is associated with a hypotonicity-induced, rapid onset, transient current prior to onset of the volume-sensitive chloride-selective current, an apparent nonspecific effect related to the overexpression of an integral membrane protein. These results suggest that there is no relationship between P-gp and the chloride channel activated by cell swelling.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Dong Y,Chen KG,Durán GE,Kouyama K,Chao AC,Sikic BI,Gollapudi SV,Gupta S,Gardner Psubject
Has Abstractpub_date
1994-10-01 00:00:00pages
5029-32issue
19eissn
0008-5472issn
1538-7445journal_volume
54pub_type
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