Clinicopathological study of sporadic Burkitt lymphoma in children / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Non-Hodgkin lymphoma is the fourth most common malignant tumors in children, Burkitt lymphoma (BL) accounts for 30-50% of all pediatric lymphomas. The aim of this study was to investigate the clinicopathologic features, immunophenotype, Epstein-Barr virus (EBV) infection and c-myc gene rearrangement of sporadic BL in children.</p><p><b>METHODS</b>Ninety-two cases of pediatric BL were retrospectively analyzed for clinical features, immunohistochemistry, EBV-encoded RNA (EBER) status by in situ hybridization and c-myc gene rearrangement by fluorescence in situ hybridization.</p><p><b>RESULTS</b>In the 92 cases, male is predominant in sex distribution (M: F = 3.38:1). The average age at diagnosis was 4.97 years. Polypoid BL showed a lower clinical stage (P = 0.002), and advanced clinical stage and low serum albumin level at diagnosis were associated with poor outcome (P = 0.024 and 0.053, respectively). The positive expression of CDl0, B-cell lymphoma-6, MUMl and EBER were 95.7% (88 cases), 92.4% (85 cases), 22.8% (21 cases), 41.3% (38 cases), respectively. The expression of MUM1 were not associated with EBV infection status (P = 1.000). c-myc gene rearrangement was detected in 94.6% (87/92). Clinical treatment information for 54 cases was collected, 21 patients died of tumor after surgery alone, 33 patients received surgery and chemotherapy, and of which six patients died shortly afterwords (MUM1 positive expression in 3 cases, P = 0.076).</p><p><b>CONCLUSIONS</b>The anatomical location, growth pattern and serum albumin level of BL were associated with biological behavior. MUM1 may be a potential adverse prognostic marker, and not associated with EBV infection status.</p>

Establishment of a mouse model of biliary obstruction and its dynamic observations / 南方医科大学学报

<p><b>OBJECTIVE</b>To establish a mouse model of biliary obstruction.</p><p><b>METHODS</b>Sixty-four Balb/c mice were divided into experimental group and control group. Obstructive jaundice was induced in the mice in the experimental group by common bile duct ligation. The level of the common bile duct diameter, WBC, LYM MID, LYM%, MID% and ALT, AST, TBIL, DBIL, IBIL, ALP and CHOL were measured 12 h and 1, 2 ,3, 4, 5, and 7 days after the ligation. The morphological changes in the liver were also observed.</p><p><b>RESULTS</b>The level of common bile duct diameter, WBC, LYM, MID, LYM%, MID% and ALT, AST, TBIL, DBIL, ALP and CHOL all underwent changes with time following certain patterns.</p><p><b>CONCLUSION</b>The jaundice manifestation of this model is similar to that of patients with biliary obstruction, and this model may provide a reliable model for studying the mechanism of obstructive jaundice.</p>

Effects of hepatic growth factor on c-kit+Lin- cell proliferation in mouse bone marrow / 南方医科大学学报

<p><b>OBJECTIVE</b>To determine the optimal cytokine combinations with hepatic growth factor (HGF) that results in the most significant simultaneous in vitro expansion of cc-kit(+)Lin(-) cells derived from the bone marrow.</p><p><b>METHODS</b>C-kit(+)Lin(-) cells were isolated from mouse bone marrow using a high-gradient magnetic cell sorting system (MACS) and expanded in the presence of stem cell factor (SCF), FLt-3 ligand (FL), leukemia inhibitor factor (LIF) thrombopoietin (TPO) and different concentrations of HGF for 7days in a liquid culture system. The total cell number and Annexin-V-positive cell number were counted, and the antigen expressions were studied with fluorescence-activated cell sorting (FACS).</p><p><b>RESULTS</b>In each group, c-kit(+)Lin(-) cells were expanded effectively and rapidly by 2 to 8 folds. Addition of 10 ng/ml HGF into SCF+FL+LIF+TPO resulted in the most significant expansion of c-kit(+)Lin(-) and total cells by 8.00 and 45.43 folds, respectively, with cell apoptosis rate of 17.42 %. But as the concentration of HGF increased, the c-kit(+)Lin(-) cells and the apoptosis rate decreased.</p><p><b>CONCLUSION</b>HGF at10 ng/ml shows optimal synergistic effect with SCF, FL, LIF and TPO in expansion of c-kit(+)Lin(-) cells, and excessive HGF may induce cell differentiation.</p>

Differentiation of transplanted mouse c-Kit+lin- bone marrow cells into hepatocytes in vitro / 南方医科大学学报

<p><b>OBJECTIVE</b>To ascertain whether mouse c-Kit(+)Lin- bone marrow cells have the potential of hepatic stem cells.</p><p><b>METHODS</b>c-Kit(+)lin- bone marrow cells were isolated and purified by magnetic-activated cell sorting (MACS) from BALB/C male donor mice, and immediately transplanted into age-matched BALB/C syngeneic female mice with 35-Gy total liver irradiation. The recipients were sacrificed 1 month after the transplantation for pathological observation of the liver morphology. The presence of Y-chromosome was examined in the liver cells of the recipient by in situ hybridization (ISH), and alpha-fetoprotein (AFP) and albumin in the cells were detected by immunohistochemistry.</p><p><b>RESULTS</b>The hepatocytes positive for Sry gene on Y-chromosome were identified 1 month after transplantation, and immunohistochemistry for AFP and albumin confirmed that the donor mice-derived cells were hepatocytes.</p><p><b>CONCLUSION</b>c-Kit(+)lin- bone marrow cells have the potential of hepatic stem cells, which can reside and differentiate into hepatocytes in the liver after transplantation. c-Kit(+)lin- bone marrow cells can be used as the source cells of cell transplantation for liver disease.</p>