Quinoline derivative KB3-1 potentiates paclitaxel induced cytotoxicity and cycle arrest via multidrug resistance reversal in MES-SA/DX5 cancer cells

Jin Suk Koo, Won Cheol Choi, Yun Hee Rhee, Hyo Jeong Lee, Eun Ok Lee, Kwang Seok Ahn, Hyun Soo Bae, Kyoo Seok Ahn, Jong Min Kang, Sang Un Choi, Myung Ok Kim, Junxuan Lu, Sung Hoon Kim

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Aims: The resistance to chemotherapeutic drugs is a major problem for successful cancer treatment. Multidrug resistance (MDR) phenotype is characterized by over-expression of P-glycoprotein (P-gp) on the cancer cell plasma membrane that extrudes drugs out of the cells. Therefore, novel MDR reversal agents are desirable for combination therapy to reduce MDR and enhance anti-tumor activity. Thus, the present study was aimed to evaluate the potent efficacy of novel quinoline derivative KB3-1 as a potent MDR-reversing agent for combined therapy with TAX. Main methods: MDR reversing effect and TAX combined therapy were examined by Rhodamine accumulation and efflux assay and Confocal immunofluorescence microscopy, Western blotting, TUNEL assay, and cell cycle analysis. Key findings: The discovery of quinoline-3-carboxylic acid [4-(2-{benzyl-3[-(3,4-dimethoxy-phenyl)-propionyl]-amino}-ethyl)-phenyl] -amide (KB3-1) as a novel MDR-reversal agent. KB3-1 significantly enhanced the accumulation and retention of a P-gp substrate, rhodamine-123 in the P-gp-expressing MES-SA/DX5 uterine sarcoma cells but not in the P-gp-negative MES-SA cells at non-toxic concentrations of 1 μM and 3 μM. Similarly, fluorescence microscopy observation revealed that KB3-1 reduced the effluxed rhodamine-123 expression on the membrane of MES-SA/DX5 cells. Consistent with decreased P-gp pumping activity, confocal microscopic observation revealed that KB3-1 effectively diminished the expression of P-gp in paclitaxel (TAX)-treated MES-SA/DX-5 cells. Furthermore, Western blotting confirmed that KB3-1 reduced P-gp expression and enhanced cytochrome C release and Bax expression in TAX treated MES-SA/DX-5 cells. In addition, KB3-1 enhanced TAX-induced apoptotic bodies in MES-SA/DX5 cells by TdT-mediated-dUTP nick-end labeling (TUNEL) staining assay aswell as potentiated TAX- induced cytotoxicity, G2/M phase arrest and sub-G1 apoptosis in MES-SA/DX5 cells but not in MES-SA cells. Interestingly, KB3-1 at 3 μM had comparable MDR-reversal activity to 10 μM verapamil, a well-known MDR- reversal agent. Significance: KB3-1 can be a MDR-reversal drug candidate for combination chemotherapy with TAX.

Original languageEnglish (US)
Pages (from-to)700-708
Number of pages9
JournalLife Sciences
Issue number21-22
StatePublished - Nov 21 2008

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)


Dive into the research topics of 'Quinoline derivative KB3-1 potentiates paclitaxel induced cytotoxicity and cycle arrest via multidrug resistance reversal in MES-SA/DX5 cancer cells'. Together they form a unique fingerprint.

Cite this