Document Detail

Proteasome inhibitor PS-341 causes cell growth arrest and apoptosis in human glioblastoma multiforme (GBM).
MedLine Citation:
PMID:  15531918     Owner:  NLM     Status:  MEDLINE    
The proteasome plays a pivotal role in controlling cell proliferation, apoptosis, and differentiation in a variety of normal and tumor cells. PS-341, a novel boronic acid dipeptide that inhibits 26S proteasome activity, has prominent effects in vitro and in vivo against several solid tumors. We examined its antiproliferation, proapoptotic effects using three human glioblastoma multiforme (GBM) cell lines and five primary GBM explants. PS-341 markedly inhibited proliferation of GBM cell lines and explants in liquid and soft agar culture. These cells developed a G2/M cell cycle arrest with a concomitant decreased percentage of cells in S phase ( approximately 2-fold), associated with an increased expression of p21(WAF1), p27(KIP1), as well as cyclin B1 and decreased levels of CDK2, CDK4, and E2F4. About 35-40% of the cells became apoptotic when exposed to PS-341 (10(-7) M, 24-48 h) as shown by Annexin V analysis; in concert with these findings, immunobloting showed a C-terminal 85 kDa apoptotic fragment of poly ADP-ribose polymerase (PARP), and a decreased level of Bcl2 and Bcl-xl. PS-341 downregulated the expression of Bcl-2 and Bcl-xl in protein levels at an early time of treatment. These changes occurred irrespective of the p53 mutational status of the cells. PS-341 activated JNK/c-Jun signaling in GBM cells, and the JNK inhibitor SP600125 blocked the JNK signaling to reverse partially the PS-341 growth inhibition. PS-341 (10(-7) M, 24 h) decreased nuclear NF-kappaB levels as shown by Western blot, and reduced transcriptional activity of NF-kappaB as measured by reporter assays in these transformed cells. Also, PS-341 enhanced TRAIL (TNF-related apoptosis-inducing ligand) and TNFalpha (tumor necrosis factor alpha) induced cell death and apoptosis (two- to five-fold) in GBM cells. In summary, PS-341 has profound effects on growth and apoptosis of GBM cells, suggesting that PS-341 may be an effective therapy for patients with gliomas.
Dong Yin; Hong Zhou; Takashi Kumagai; Gentao Liu; John M Ong; Keith L Black; H Phillip Koeffler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Oncogene     Volume:  24     ISSN:  0950-9232     ISO Abbreviation:  Oncogene     Publication Date:  2005 Jan 
Date Detail:
Created Date:  2005-01-28     Completed Date:  2005-03-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8711562     Medline TA:  Oncogene     Country:  England    
Other Details:
Languages:  eng     Pagination:  344-54     Citation Subset:  IM    
Division of Hematology/Oncology, Cedars-Sinai Medical Center, UCLA School of Medicine, Los Angeles, CA 90048, USA.
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MeSH Terms
Apoptosis / drug effects*
Boronic Acids / pharmacology*
Cell Division / drug effects*
Cell Line, Tumor
Glioblastoma / pathology*
Models, Biological
Protease Inhibitors / pharmacology*
Proteasome Endopeptidase Complex / antagonists & inhibitors*
Pyrazines / pharmacology*
Reverse Transcriptase Polymerase Chain Reaction
Reg. No./Substance:
0/Boronic Acids; 0/Protease Inhibitors; 0/Pyrazines; 0/bortezomib; EC Endopeptidase Complex

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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