Pivotal Roles of Snail Inhibition and RKIP Induction by the Proteasome Inhibitor NPI-0052 in Tumor Cell Chemoimmunosensitization

被引：78

作者：

Baritaki, Stavroula ^{[1
]}

Yeung, Kam ^{[2
]}

Palladino, Michael ^{[3
]}

Berenson, James ^{[4
]}

Bonavida, Benjamin ^{[1
]}

机构：

[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Microbiol Immunol & Mol Genet, Jonsson Comprehens Canc Ctr, Los Angeles, CA 90095 USA

[2] Univ Toledo, Coll Med, Dept Canc Biol & Biochem, Toledo, OH 43606 USA

[3] Nereus Pharmaceut, San Diego, CA USA

[4] Inst Myeloma & Bone Canc Res, Hollywood, CA USA

来源：

CANCER RESEARCH | 2009年 / 69卷 / 21期

关键词：

NF-KAPPA-B; MULTIPLE-MYELOMA CELLS; PROSTATE-CANCER CELLS; FINGER TRANSCRIPTION FACTOR; RADIATION-INDUCED APOPTOSIS; PANCREATIC-CANCER; RAF KINASE; E-CADHERIN; MESENCHYMAL TRANSITION; SENSITIZES PROSTATE;

D O I：

10.1158/0008-5472.CAN-09-1069

中图分类号：

R73 [肿瘤学];

学科分类号：

100214 [肿瘤学];

摘要：

The novel proteasome inhibitor NPI-0052 has been shown to sensitize tumor cells to apoptosis by various chemotherapeutic drugs and tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), although the mechanisms involved are not clear. We hypothesized that NPI-0052-mediated sensitization may result from NF-kappa B inhibition and downstream modulation of the metastasis inducer Snail and the metastasis suppressor/immunosurveillance cancer gene product Raf-1 kinase inhibitory protein (RKIP). Human prostate cancer cell lines were used as models, as they express different levels of these proteins. We show that NPI-0052 inhibits both NF-kappa B and Snail and induces RKIP expression, thus resulting in cell sensitization to CDDP and TRAIL. The direct role of NF-kappa B inhibition in sensitization was corroborated with the NF-kappa B inhibitor DHMEQ, which mimicked NPI-0052 in sensitization and inhibition of Snail and induction of RKIP. The direct role of Snail inhibition by NPI-0052 in sensitization was shown with Snail small interfering RNA, which reversed resistance and induced RKIP. Likewise, the direct role of RKIP induction in sensitization was revealed by both overexpression of RKIP (mimicking NPI-0052) and RKIP small interfering RNA that inhibited NPI-0052-mediated sensitization. These findings show that NPI-0052 modifies the NF-kappa B-Snail-RKIP circuitry in tumor cells and results in downstream inhibition of antiapoptotic gene products and chemoimmunosensitization. The findings also identified Snail and RKIP as targets for reversal of resistance. [Cancer Res 2009;69(21):8376-85]

引用

页码：8376 / 8385

页数：10

共 56 条

[1]

Salinosporamide A (NPI-0052) potentiates apoptosis, suppresses osteoclastogenesis, and inhibits invasion through down-modulation of NF-κB-regulated gene products [J].