Reference - Detail
|Author||Teng YN, Sheu MJ, Hsieh YW, Wang RY, Chiang YC, Hung CC.|
|Title||β-carotene reverses multidrug resistant cancer cells by selectively modulating human P-glycoprotein function.|
BACKGROUND:The issue of multidrug resistance (MDR) cancer is one of the major barriers to successful chemotherapy treatment. The ATP-binding cassette (ABC) efflux transporters play an important role in the chemotherapeutic failure. Several generations of ABC efflux transporter inhibitors have been developed, however, none of them could provide better clinical outcome due to systemic toxicities and significant drug-drug interactions. Therefore, the present study focused on identifying the effect of the natural carotenoid on ABC transporters and may provide a safer choice to defeat MDR cancer.
PURPOSE:The aim of the present study was to evaluate the inhibitory potency of β-carotene on the ABC efflux transporters, as well as the reversal effect of β-carotene toward MDR cancers. The underlying molecular mechanisms and inhibitory kinetics of β-carotene on the major ABC efflux transporter, P-glycoprotein, were further investigated.
METHODS:The human P-gp (ABCB1/Flp-In(TM)-293), MRP1 (ABCC1/Flp-In(TM)-293) and BCRP (ABCG2/Flp-In(TM)-293) stable expression cells were established by using the Flp-In(TM) system. The cytotoxicity of β-carotene was evaluated by MTT assay in the established cell lines, sensitive cancer cell lines (HeLaS3 and NCI-H460) and resistant cancer cell lines (KB-vin and NCI-H460/MX20). Surface protein detection assay and eFluxx-ID Green Dye assay were applied for confirmation of surface expression and function of the transporters. The transporter inhibition potency of β-carotene was evaluated by calcein-AM uptake assay and mitoxantrone accumulation assay. Further interaction kinetics between β-carotene and P-gp were analyzed by rhodamine123 and doxorubicin efflux assay. The influence of β-carotene on ATPase activity was evaluated by Pgp-Glo(TM) Assay System.
RESULTS:Among the tested ABC efflux transporters, β-carotene significantly inhibited human P-gp efflux function without altering ABCB1 mRNA expression. Furthermore, β-carotene stimulated both P-gp basal ATPase activity and the verapamil-stimulated P-gp ATPase activity. In addition, β-carotene exerted partially inhibitory effect on BCRP efflux function. The combination of β-carotene and chemotherapeutic agents significantly potentiated their cytotoxicity in both cell stably expressed human P-gp (ABCB1/Flp-In(TM)-293) and MDR cancer cells (KB-vin and NCI-H460/MX20).
CONCLUSION:The present study indicated that β-carotene may be considered as a chemo-sensitizer and regarded as an adjuvant therapy in MDR cancer treatment.
|MeSH||ATP Binding Cassette Transporter, Subfamily B / antagonists & inhibitors ATP Binding Cassette Transporter, Subfamily B / metabolism* ATP Binding Cassette Transporter, Subfamily G, Member 2 ATP-Binding Cassette Transporters / antagonists & inhibitors ATP-Binding Cassette Transporters / metabolism Adenosine Triphosphatases / metabolism Antineoplastic Agents / pharmacology Cell Line, Tumor / drug effects Doxorubicin / pharmacology Drug Resistance, Multiple / drug effects* Drug Resistance, Neoplasm / drug effects* Humans Multidrug Resistance-Associated Proteins / antagonists & inhibitors Multidrug Resistance-Associated Proteins / metabolism Neoplasm Proteins / antagonists & inhibitors Neoplasm Proteins / metabolism Neoplasms / metabolism* Verapamil / pharmacology beta Carotene / pharmacology*|
|WOS Category||INTEGRATIVE & COMPLEMENTARY MEDICINE PHARMACOLOGY & PHARMACY PLANT SCIENCES CHEMISTRY, MEDICINAL|
|DNA material||pMDRA1 (RDB01372) Genome Network Project Human cDNA IRAL039K21 (HGY095861) human retinal pigment epithelium cell ARPE19 cDNA clone set RBb11B10 (HKR324434).|