The function of the multidrug resistance protein (MDRI) is one of the major causes of multiple chemotherapy resistance in tumor cells. We have developed a group of hydrophohic peptide-based molecules with original structures (REVERSINs), which act as high-affinity ligands of the MDRI protein. In this study we have examined the effects of REVERSINs on the vanadate-sensitive MDRI-ATPase activity in isolated cell membranes, on the M DR I-dependent Calcein AM extrusion, and on the modulation ot cytotoxicity of vincristine and adriamycin in MDRI-expressing tumor cells. We found that RKVERSINs significantly stimulated MDRI-ATPase activity, while inhibited fluorescent dye extrusion in the low micromolar concentrations. In these latter concentrations RKVERSINs also inhibited M DR I-dependent tumor cell resistance against vincristine and adriamycin, while had no toxic effect on the control cells. We suggest that REVERSINs are good candidates for the development of specific agents to prevent multidrug resistance in cancer.
|Publication status||Published - Dec 1 1997|
ASJC Scopus subject areas
- Molecular Biology