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Effect and molecular mechanism of proteasome inhibitor in TRAIL-induced apoptosis resistance on malignant lymphoma cells

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Author:
No author available
Journal Title:
JOURNAL OF LEUKEMIA & LYMPHOMA
Issue:
6
DOI:
10.3760/cma.j.issn.1009-9921.2009.06.004
Key Word:
TRAIL;PS-341;淋巴瘤细胞;凋亡抵抗;TRAIL;PS-341;Lymphoma cells;Apoptotic resistance

Abstract: Objective To explore the effect and molecular mechanism of proteasome inhibitor in TNF-related apoptosis-inducing ligand (TRAIL)-induced apoptosis resistance on malignant lymphoma cells.Methods Raji cells were treated with TRAIL and proteasome inhibitor (PS-341) in vitro and the cell growth index was evaluated by MTT assay; cell cycle was analysed by flow cytometry; the protein and mRNA level of Bax were measured by Western blotting and real time RT-PCR. Results TRAIL inhibited proliferation of Raji cells at the concentration of 500 μg/L, but the inhibition rate was lower than that of the control cell:Hmy2.ciR.TRAIL arrested cell in G0/G1 phase. The Bax protein in Raji is degraded, but the Bax mRNA expression level does not change significantly .The effects of TRAIL was enhanced significantly 10 nmol/L PS-341 was added. Conclusion Raji cells are resistant in TRAIL-induced apoptosis. This effect may be related to the decrease of Bax protein. The Ubiquitin-proteasome pathway is involved in the degradation of Bax in TRAIL-treated Raji cells.

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