Relationship between Chemotactic Factor CCL5 and Diabet-associated Diffuse Large B Cell Lymphoma / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To explore whether the chemotactic factor CCL5 is the major factor of diffuse large B cell lymphoma (DLBCL) induced by diabetes or not.</p><p><b>METHODS</b>The normal human B cells and DLBCL cells were cultured in vitro; the RT-PCR was used to detect their CCL5 mRNA expression, the human DLBCL cell line and mouse-derived DLBCL cell line A20 were cultured in vitro by using glucose at 5 and 30 mmol/L, respectively, then their CCL5 mRNA expression was detected by PT-PCR; the diabetic mouse model was constructed through peritoneal injection of streptozotocin at low dose in the BALB/c mice; the cell lines with stably high and low expression of CCL5 were established via lentiviral transfection and the cell lines with low and high expression of CCL5 were subcutaneously injected into diabetic mice and mice with normal blood sugar level. According to blood sugar level, the experimental mice were divided into 2 groups: diabetic group (A group) and normal blood sugar group as control (B group); then according to CCL5 expression level, the A group and B group were divided as well into high expression group (A1 group and B1 group) and low expression group (A2 group and B2 group), respectively, the tumor-formation rate, tumor-formation time, tumor size and texture were analyzed, respectively; the CCL5 expression was detected by using HE staining of tumor tissue and immunohistochemical method.</p><p><b>RESULTS</b>The expression of CCL5 mRNA in human DLBCL cell line cultured in vitro was higher than that in normal B cells (P < 0.05); the expressions of CCL5 mRNA in human DLBCL cells cultured in high sugar concentration in vitro and mouse DLBCL cells were higher than those in cells cultured in low sugar concentration (P < 0.05). The tumor-formation rates in diabetic mice injected with high and low expression of CCL5 cell line A20 were 93.3% in A1 group and 60% in A2 group; the their tumor-formation time was 7.0 ± 0.85 days in A1 group and 9.5 ± 2.8 days in A2 group, while the tumor formation rates in mice with normal blood sugar level were 20% in B1 group and 20% in B2 group, and their tumor-formation time was 12 ± 1.3 days and 14 ± 2.5 days respectively; the CCL5 expression level in tumor tissue of diabetic mice was higher than that in tumor tissue of mice with normal blood sugar level.</p><p><b>CONCLUSION</b>The high blood glucose level can casase increase of DLBCL risk and promote the tumor growth; the chemotactic factor CCL5 may play an important role in the growth and migration of DLBCL caused by diabetes mellitus.</p>

Correlation of seven biological factors (Hsp90a, p53, MDM2, Bcl-2, Bax, Cytochrome C, and Cleaved caspase3) with clinical outcomes of ALK+ anaplastic large-cell lymphoma / 生物医学与环境科学（英文）

<p><b>OBJECTIVE</b>To explore correlation of seven apoptosis-related proteins (Hsp90a, p53, MDM2, Bcl-2, Bax, Cytochrome C, and Cleaved caspase3) with clinical outcomes of ALK+ anaplastic large-cell lymphoma (ALCL).</p><p><b>METHODS</b>Using immunohistochemistry and immunofluorescence double staining methods, the expressions of these seven apoptosis-associated proteins were studied to clarify their relationship with clinical outcomes of 36 ALK+ and 25 ALK-systemic ALCL patients enrolled between 1996 and 2006. The relationship of these apoptosis-regulating proteins with NPM-ALK status was also evaluated with the tyrosine inhibitor herbimycin A (HA) in vitro by immunocytochemistry, Western blotting and flow cytometric assays.</p><p><b>RESULTS</b>The presence of Hsp90α-, MDM2-, Bax-, Cytochrome C, and Cleaved caspase3-positive tumor cells was found significantly different in ALK+ and ALK-ALCLs, which was correlated with highly favorable clinical outcome. The Bcl-2- and p53-positive tumor cells were found in groups of patients with unfavorable prognosis. Inhibition of NPM-ALK by HA could reactivate the p53 protein and subsequent apoptosis-related proteins and therefore induced apoptosis in ALK+ ALCL cells.</p><p><b>CONCLUSION</b>Our results suggest that these seven proteins might be involved in apoptosis regulation and associated with clinical outcome of ALK+ systemic ALCLs. We also reveal a dynamic chain relation that NPM-ALK regulates p53 expression and subsequent apoptosis cascade in ALK+ ALCLs.</p>

Expression of miR-9 in B lymphocytes and B cell lymphomas cell lines and its significance / 中华血液学杂志

<p><b>OBJECTIVE</b>To investigate the expression of miR-9 in B lymphocytes, B cell lymphoma and classical Hodgkin's lymphoma (cHL) cell lines and its significance.</p><p><b>METHODS</b>CD19(+) B lymphocytes were sorted from normal lymph node by magnetic beads. Total cellular micro-RNA was extracted from cHL cell line L428, B cell lymphoma cell lines Ly1 and Ly10 (diffuse large B cell lymphoma), Raji cells (Burkitt's lymphoma) and CD19(+) B lymphocytes, respectively. These micro-RNAs were separately transformed into cDNA by reverse transcription. The expression levels of miR-9 were measured by fluorescence quantitative PCR. In situ hybridization was used to detect the expression of miR-9 in cell lines.</p><p><b>RESULTS</b>The expression of miR-9 was high in L428 cells (104.44 ± 1.61), and low in cell lines of B cell lymphoma (Ly1: 2.17 ± 0.38; Ly10: 1 ± 0.015; Raji: 2.65 ± 0.89), and extremely low in CD19(+) B lymphocytes (0.0026 ± 0.00040). Compared with that in the other cell lines, the expression of miR-9 in L428 cells was statistically significant (P < 0.05). miR-9 localized in the cytoplasm diffusely and strongly in L428, but scattered and slightly with some prominent distribution around the nuclear membranes in Ly1 and Ly10, and only weakly in Raji.</p><p><b>CONCLUSIONS</b>miR-9 highly expressed in cHL cell line and might be a molecular marker for diagnosis and treatment of cHL.</p>