Linked Life Data

18398749

Source:http://linkedlifedata.com/resource/pubmed/id/18398749

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pubmed-article:18398749pubmed:abstractTextBortezomib is more active against mantle cell lymphoma (MCL) than against most other lymphoma subtypes. Nevertheless, up to half of patients with MCL have bortezomib resistant disease. Factors contributing to intrinsic resistance to bortezomib have not been determined. Here we used a panel of eight bortezomib sensitive (median IC(50) 5.9 nM) and three relatively bortezomib resistant cell lines (median IC(50) 12.9 nM) to investigate differences in tumor biology that could determine sensitivity to bortezomib. Bortezomib effectively inhibited high baseline proteasome activity and induced a comparable degree of proteasome inhibition in both sensitive and resistant cells. At 10 nM, bortezomib induced the proapoptotic BH3-only protein Noxa in sensitive but not resistant cells. At higher concentrations of bortezomib, however, Noxa was also upregulated in resistant cells and this effect was sufficient to induce apoptosis. Silencing of Noxa with siRNA rescued these cells from apoptosis, arguing against a defect in Noxa regulation or function as the basis of bortezomib resistance. Bortezomib was equally effective against cells with high and low constitutive NF-kappaB signaling. Also, sensitive and resistant MCL cell lines showed comparable activation of the AKT pathway. We conclude that bortezomib can overcome classic mechanisms of resistance to apoptosis and that determinants of bortezomib sensitivity in MCL are due to differences in signaling or stress pathways upstream of Noxa.lld:pubmed
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pubmed-article:18398749pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:18398749pubmed:articleTitleNoxa mediates bortezomib induced apoptosis in both sensitive and intrinsically resistant mantle cell lymphoma cells and this effect is independent of constitutive activity of the AKT and NF-kappaB pathways.lld:pubmed
pubmed-article:18398749pubmed:affiliationHematology Branch, National Heart, Lung, and Blood Institute, Bethesda, MD 20892, USA.lld:pubmed
pubmed-article:18398749pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18398749pubmed:publicationTypeResearch Support, N.I.H., Intramurallld:pubmed
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