Related Experiment Video
Updated: Jul 18, 2026

Expression, Detergent Solubilization, and Purification of a Membrane Transporter, the MexB Multidrug Resistance Protein
Published on: December 3, 2010
RALBP1/RLIP76 mediates multidrug resistance
Kenneth J Drake1, Jyotsana Singhal, Sushma Yadav
1Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, TX 76019-0065, USA.
Overexpression of RLIP76/RALBP1 transporter confers multidrug resistance in K562 leukemia cells. Inhibiting this transporter increases chemotherapy drug efficacy, suggesting it as a therapeutic target for leukemia treatment.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- RLIP76/RALBP1 is a transporter protein known to mediate drug resistance in solid tumors.
- Its role in multidrug resistance within hematological malignancies has not been previously established.
Purpose of the Study:
- To investigate the role of RLIP76/RALBP1 in mediating multidrug resistance in human myelogenous leukemia (K562 cells).
- To evaluate the therapeutic potential of targeting RLIP76/RALBP1 in leukemia treatment.
Main Methods:
- K562 human myelogenous leukemia cells were utilized to study RLIP76/RALBP1 function.
- RLIP76/RALBP1 overexpression and inhibition using polyclonal antibodies were employed.
- Drug accumulation and cytotoxicity assays were performed.
Main Results:
- Overexpression of RLIP76/RALBP1 resulted in broad resistance to multiple chemotherapy agents, including cisplatin, melphalan, doxorubicin, and vinca alkaloids.
- Inhibition of RLIP76/RALBP1 led to increased intracellular accumulation of chemotherapy drugs.
- Inhibition of RLIP76/RALBP1 significantly enhanced drug-induced cytotoxicity in K562 cells.
Conclusions:
- RLIP76/RALBP1 plays a critical role in conferring multidrug resistance in human myelogenous leukemia.
- Targeting RLIP76/RALBP1 presents a promising therapeutic strategy for overcoming chemotherapy resistance in leukemia.
More Related Videos
11:02Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1
Published on: May 27, 2016
05:06Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System
Published on: January 5, 2024
Related Concept Videos
Carrier-Mediated Transport
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters
Mechanism of Antibiotic Resistance in MRSA
Rab Proteins
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
ABC Transporters: Exporter
Rab Cascades