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RLIP76 is a stress-responsive glutathione-electrophile-conjugates (GS-E) and drugs transporter which is over-expressed in different types of cancers. Cdc2 is a cell-cycle check point control kinase which has been shown to bind to RLIP76 during mitosis, such that endocytosis is inhibited. In present studies, we have purified cdc2 and examined its effect on the transport activity of RLIP76 reconstituted into artificial liposomes. Both doxorubicin (DOX) and dinitro-phenyl S-glutathione (DNP-SG) transport were inhibited by cdc2 in a concentration dependent manner. Liposomal delivery of cdc2 to H358 cells caused apoptosis, resulted in an increased intracellular doxorubicin-accumulation and decreased rate of efflux from the cells. In the present communication, we propose that the accumulation-deficient drug-resistance mediated by RLIP76 can be modulated by inhibition of RLIP76 transport activity by cdc2.

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Increased expression of cdc2 inhibits transport function of RLIP76 and promotes apoptosis

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  • Publisher Elsevier
  • Copyright Copyright © 2009 Elsevier Ireland Ltd
  • ISSN 0304-3835
  • D.O.I. 10.1016/j.canlet.2009.03.033
  • Publisher site Get PDF  

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