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Title 

Blocking tumor cell migration and invasion with biphenyl isoxazole derivative KRIBB3, a synthetic molecule that inhibits Hsp27 phosphorylation

 

Hsp27 인산화 저해제 KRIBB3 의한 암세포 이동 및 침윤 억제

Authors 

Ki Deok ShinMi Young LeeDae Seop ShinSangku LeeKwang Hee SonSukhoon KohY K PaikByoung-Mog KwonDong Cho Han

Publisher 

American Society for Biochemistry and Molecular Biology

Issue Date 

2005

Citation 

Journal of Biological Chemistry, vol. 280, no. 50, pp. 41439-41448

Keywords 

affinity chromatographycarboxylic acidscellspatient treatmentcell motilityphosphorylationtumor cell invasiontumor cell migrationtumors5 (2,4 dimethoxy 5 ethylphenyl) 4 (4 bromophenyl)isoxazole

Abstract 

Cell migration is a prerequisite for cancer invasion and metastasis, suggesting cell motility as a potential therapeutic target for cancer treatment. A synthetic library was screened to identify inhibitors of tumor cell migration. From this, we discovered that CAC1098 (aurintricarboxylic acid) and CBI-0997 (5-(2,4-dimethoxy-5-ethylphenyl)-4-(4-bromophenyl) isoxazole) inhibited migration of a MDA-MB-231 cells with IC50 = 5 and 50 nM, respectively. We synthesized KRIBB3 (5-(5-ethyl-2-hydroxy-4-methoxyphenyl)-4-(4- methoxyphenyl) isoxazole) by replacing the bromide group of CBI-0997 with a methoxyl group. Like CBI-0997, KRIBB3 has anti-migratory and anti-invasive activities in MDA-MB-231 cells. Because KRIBB3 has a better drug-like structure, we focused our effort on further understanding its anti-migratory mechanism. Biotinyl-KRIBB3 was synthesized as an affinity probe for identification of KRIBB3-binding proteins. Using affinity chromatography, we identified Hsp27 as a target protein of KRIBB3 in vitro. Treatment of MDA-MB-231 cells with phorbol 12-myristate 13-acetate induced protein kinase C-dependent phosphorylation of Hsp27 and tumor cell migration. In contrast, treatment of MDA-MB-231 cells with KRIBB3 blocked phorbol 12-myristate 13-acetate-induced phosphorylation of Hsp27 and tumor cell migration. Furthermore, overexpression of Hsp27 antagonized the inhibitory effect of KRIBB3 on tumor cell invasion, and knockdown of Hsp27 using small interfering RNA inhibited tumor cell migration. Overall, our results demonstrate that KRIBB3 inhibits tumor cell migration and invasion by blocking protein kinase C-dependent phosphorylation of Hsp27 through its direct binding to Hsp27.

ISSN 

0021-9258

Link 

http://dx.doi.org/10.1074/jbc.M507209200

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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