Expression Changes of β-catenin and P-GSK-3β in Patients with Mantle Cell Lymphoma / 中国实验血液学杂志

<p><b>OBJECTIVE</b>This study was purposed to detect the expressions of β-catenin and P-GSK-3 β in Wnt signaling pathway of patients with mantle cell lymphoma(MCL), and investigate its relationship with the pathogenesis of MCL.</p><p><b>METHODS</b>The expression levels of β -catenin protein and P-GSK-3 protein in mantle cell lymphoma and hyperplastic lymphadenitis were detected by using anti-β-catenin, P-GSK-3β polyclonal antibody and S-P staining technique.</p><p><b>RESULTS</b>The abnormal expression of β-catenin protein(73.33%) in mantle cell lymphoma group was significantly higher than that (6.7%) in reactive lymph node hyperplasia group (P<0.05); and the positive rate of P-GSK-3 β(66.67%) in mantle cell lymphoma group was significantly higher than that (16.67%) in reactive hyperplasia of lymph node group (P<0.05). Spearman correlation analysis showed that there was obvious positive correlation (R=0.852, P<0.01).</p><p><b>CONCLUSION</b>The abnormal high expressions of β-catenin and P-GSK-3 β protein have been confirmed to appeare in mantle cell lymphoma.</p>

Antiproliferative Effect of Specific Inhibitor XAV939 for β-catenin on MCL Jeko-1 Cells / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To investigate the effect of short hairpin RNA (shRNA) and XAV939, a specific inhibitor for β-catenin, on growth and apoptosis of mantle cell lymphoma(MCL) Jeko-1 cell line.</p><p><b>METHODS</b>β-catenin shRNA eukaryotic expression vector was transfected into Jeko-1 cells, the antiproliferative effect of shRNA on Jeko-1 cells was detected by RT-PCR and Western blot. The proliferation inhibitory rate of Jeko-1 cells treated by different doses of XAV939 was assayed by MTT method; the level of apoptosis of Jeko-1 cells was detected by flow cytometry; the expression levels of apoptosis-related protein BCL-2, BAX, CyclinD1, C-MYC and Caspase-3 in Jeko-1 cells were determined by Western blot.</p><p><b>RESULTS</b>The expression of β-catenin mRNA and growth of Jeko-1 cell line were inhibited by shRNA; after Jeko-1 cells treated with 0,2 and 8 µmol/L XAV939 for 48 hours, the cell proliferation rate decreased, while the cell apoptosis rate increased, the expressions of apoptosis-related protein BCL-2, CyclinD1 and C-MYC were down-regulated, on the contrary, the expression of BAX and caspase-3 were up-regulated.</p><p><b>CONCLUSION</b>The specific inhibition of β-catenin can inhibit Jeko-1 cell proliferation and promote the cell apoptosis.</p>

Study on aberration in histone methylation and acetylation in acute leukemia / 中华血液学杂志

<p><b>OBJECTIVE</b>To study the aberration in histone H3K4 and H3K9 methylation and H3 and H4 acetylation in human acute leukemia (AL) cells.</p><p><b>METHODS</b>The histone H3K4 and H3K9 methylation and H3 and H4 acetylation were detected by Western blot in 34 AL patients and 13 controls (9 non leukemia patients, 4 healthy volunteers).</p><p><b>RESULTS</b>The level of H3K4 methylation was significantly lower in 19 AL patients than in non leukemia (0.220 ± 0.096 vs 0.447 ± 0.186, P < 0.01), while the level of H3K9 methylation was significantly higher (0.409 ± 0.106 vs 0.168 ± 0.015, P < 0.01); Both level of histone H3 and H4 acetylation in 15 AL patients were significantly lower (H3: 0.128 ± 0.013 vs 0.386 ± 0.104, H4: 0.096 ± 0.008 vs 0.341 ± 0.096, respectively, both P < 0.01).</p><p><b>CONCLUSION</b>Aberration of histone methylation and deficient histone acetylation in AL may represent the markers for an aberrant post-translational modification of histones and chromatin structure. It might be a potential epigenetic target for anti-leukemia agent.</p>