Terpenes isolated from Polyalthia simiarum and their cytotoxic activities.

Two new C triterpenes, polysimiaric acid A (1) and B (2) as well as one new clerodane diterpenoid, 16,16-dimethoxy-cleroda-3,13Z-dien-15-oic acid (3), together with six known compounds were isolated from Polyalthia simiarum. Their structures were determined by analysis of 1D and 2D NMR data. Three new compounds were tested for their cytotoxicity against five human tumour cell lines.

[Blocking Two Signals of Immuno-Activated T Cells from Antigen Presenting Cells Can Prevent Chronic GVHD of Murine].

Objective: To explore the effects of blocking TCR-CD3 and B7-CD28 signals on immune function of mice with chronic GVHD by using TJU103 and CTLA4-Ig.

Methods: On the basis of foregoing murine model of chronic GVHD, according to interference modes after infusion 6×10 spleen cells of donor mice, the recipients were divided into 5 groups: blank control, cGVHD, TJU103 interference, CTLA4-Ig interference and TJU103+CTLA4-Ig interference groups. The score of clinical manifestation and tissue histopathology were used to evaluate the effects of all the interferences on chronic GVHD.

MicroRNA-150 enhances radiosensitivity by inhibiting the AKT pathway in NK/T cell lymphoma.

Background: Radioresistance is a major challenge during the treatment of NK/T cell lymphoma. This study aimed to investigate the potential role of MicroRNA-150 (miR-150) in increase the sensitivities of NK/T cell lymphoma to ionizing radiation.

Results: In this study, we found that miR-150 was significantly decreased in NK/T cell lymphoma tissues and cell lines.

[Synergistic Killing Effects of Arsenic Trioxide Combined with Itraconazole on KG1a Cells].

Objective: To explore the effect of arsenic trioxide combined with itraconazole on proliferation and apoptosis of KG1a cells and its potential mechanism.

Methods: The cell morphology was observed with Wrighe-Giemsa staining; cell survival rate was examined by CCK-8; and colony formation capacity was measured by methylcellulose colony formation test; the flow cytometry was used to analyse the cell apoptosis rate and cell cycle; the protein expressions of BCL-2,caspase-3,BAX,SMO,Gli1 and Gli2 were detected by Western-blot.

Results: The arsenic trioxide and itraconazole alone both could inhibit the KG1a cell proliferation in dose-and time-dependent manner.

Sunitinib Induces NK-κB-dependent NKG2D Ligand Expression in Nasopharyngeal Carcinoma and Hepatoma Cells.

Multitargeted tyrosine kinase inhibitors (MTKIs) have been shown to combine with natural killer (NK) cell adoptive transfer for the treatment in various cancers. MTKIs sensitize cancer cells to NK cell therapy through upregulation of nature killer group 2 member D ligands (NKG2DLs) on tumor cells. However, the molecular mechanism of MTKIs-mediated upregulation of NKG2DLs is still unknown.

Conditioning with Fludarabine-Busulfan versus Busulfan-Cyclophosphamide Is Associated with Lower aGVHD and Higher Survival but More Extensive and Long Standing Bone Marrow Damage.

Acute graft-versus-host disease (aGVHD) is a major complication of allogeneic hematopoietic stem cell transplantation (allo-HSCT) and a major cause of nonrelapse mortality after allo-HSCT. A conditioning regimen plays a pivotal role in the development of aGVHD. To provide a platform for studying aGVHD and evaluating the impact of different conditioning regimens, we established a murine aGVHD model that simulates the clinical situation and can be conditioned with Busulfan-Cyclophosphamide (Bu-Cy) and Fludarabine-Busulfan (Flu-Bu).

[Effect of honokiol on proliferation and apoptosis in HL-60 cells and its potential mechanism].

This study was aimed to investigate the effect of Honokiol (HNK) on proliferation and apoptosis of acute myeloid leukemia HL-60 cells and its potential mechanism. Inhibitory effect of HNK on the HL-60 cell proliferation was detected by MTT assay. Flow cytometry was used to detect the change of cell cycle and AnnexinV/PI staining was used to detect apoptosis.

[Synergistic killing effect of arsenic trioxide combined with curcumin on KG1a cells].

This study was aimed to explore the effect of arsenic trioxide combined with curcumin on proliferation and apoptosis of KG1a cells and its potential mechanism. The cell survival rate was mesured by MTT; colony formation capacity was examined by methylcellulose colony formation test; flow cytometry was used to analyse the cell surface molecules, cell apoptosis rate and cell cycle; the cell morphology was observed with Wright-Giemsa staining and the protein expression of BCL-2, BAX, PARP was detected by Western blot. The results showed that the phenotype of KG1a cells was CD34(+)CD38(-), while the phenotype of HL-60 cell was CD34(+)CD38(+).

[Honokiol combined with Gemcitabine synergistically inhibits the proliferation of human Burkitt lymphoma cells and induces their apoptosis].

This study was aimed to investigate the effect of Honokiol (HNK) combined with Gemcitabine (GEM) on the proliferation and apoptosis of human Burkitt lymphoma Raji cells. Cell proliferation was detected by CCK-8 method to study the role of Honokiol and Gemcitabine in Raji cells. The cell apoptosis and cell cycle status were analyzed by flow cytometry.

[Cytotoxicity of Naja Naja Actra Venom Component combined with activated immune cells on leukemia cell line KG1a].

This study was aimed to investigate the cytotoxic effect of the Naja Naja Actra Venom Component (NNAVC) combined with activated immune cells on human acute myeloblastic leukemia line KG1a cells. The cytotoxic effects of NNAVC at different concentrations on KG1a cells were measured by CCK-8 method. LDH releasing assay was used to detect the cytotoxic effects of activated immune cells, NNAVC combined with activated immune cells on KG1a cells and the sensitivity of KG1a treated with NNAVC to activated immune cells.

[NVP-BEZ235 inhibits proliferation and colony-forming capability of CD34(+)CD38(-) human acute myeloid leukemia stem cells].

This study was aimed to explore the effect of NVP-BEZ235, a dual phosphatidylinositol 3-kinase/mammalian target of rapamycin inhibitor, on proliferation, cell cycle and colony forming capability of CD34(+)CD38(-) human acute myeloid leukemia (AML) KG1a cells. Flow cytometry was used to detect expression of CD34 and CD38 on the surface of human AML KG1a cells; Trypan blue assay was used to analyze the effect of NVP-BEZ235 at various concentrations on proliferation of KG1a cells; flow cytometry was performed to examine the cell cycle of KG1a cells after NVP-BEZ235 treatment; Soft agar colony-forming experiment was used to detect the colony forming ability of KG1a cells treated with NVP-BEZ235 at various concentrations. The results indicated that the percentage of CD34(+)CD38(-) AML KG1a cells was (98.

Irradiation induced injury reduces energy metabolism in small intestine of Tibet minipigs.

Background: The radiation-induced energy metabolism dysfunction related to injury and radiation doses is largely elusive. The purpose of this study is to investigate the early response of energy metabolism in small intestinal tissue and its correlation with pathologic lesion after total body X-ray irradiation (TBI) in Tibet minipigs.

Methods And Results: 30 Tibet minipigs were assigned into 6 groups including 5 experimental groups and one control group with 6 animals each group.

[A case report of myelodysplastic/myeloproliferative disease unclassifiable with karyotype aberration of trisomy 8 and JAK2 mutation].

This study aimed to investigate the relationship between clinical features of myelodysplastic/myeloproliferative disease, unclassifiable (MDS/MPD-U), karyotype of chromosome and JAK2 mutation in 1 case. The clinical features, karyotype and JAK2 mutation of the patient with MDS/MPD-U were studied by means of bone marrow biopsy, karyotype analysis and ARMS-PCR technique. The results indicated that the typical micromegakaryocytes and thrombocytosis, karyotype aberration of trisomy 8 as well as JAK2 V617F mutation were found in this patient.

The diagnostic value of 18F-FDG-PET/CT in hematopoietic radiation toxicity: a Tibet minipig model.

This study was undertaken to assess the diagnostic value of 2-[(18)F]-fluoro-2-deoxy-D-glucose positron emission tomography with computed tomography ([(18)F]-FDG-PET/CT) in the detection of radiation toxicity in normal bone marrow using Tibet minipigs as a model. Eighteen Tibet minipigs were caged in aseptic rooms and randomly divided into six groups. Five groups (n = 3/group) were irradiated with single doses of 2, 5, 8, 11 and 14 Gy of total body irradiation (TBI) using an 8-MV X-ray linear accelerator.

¹⁸F-FDG uptake by spleen helps rapidly predict the dose level after total body irradiation in a Tibetan minipig model.

Objectives: To investigate whether (18)F- FDG uptake can be applied in dosimetry to facilitate the rapid and accurate evaluation of individual radiation doses after a nuclear accident.

Methods: Forty-eight Tibetan minipigs were randomised into a control group (n = 3) and treatment groups (n = 45). (18)F-FDG combined positron-emission tomography and computed tomography (PET/CT) were carried out before total body irradiation (TBI) and at 6, 24 and 72 h after receiving TBI doses ranging from 1 to 11 Gy.

Effect of total body X-ray irradiation on lymph node in Tibet minipig.

The purpose of this study was to determine the time-dose-effect of total body X-ray irradiation on lymphocytes in lymph nodes and peripheral blood in Tibet minipigs. Forty-eight Tibet minipigs were assigned into 6 groups including 5 experimental groups with 9 and the control group with 3. The minipigs in experimental groups were subjected to a total body X-ray irradiation of 2, 5, 8, 11, and 14 Gy respectively.

High incidence of severe influenza among individuals over 50 years of age.

Age-specific epidemiological data on asymptomatic, symptomatic, and severe infections are essential for public health policies on combating influenza. In this study, we incorporated data on microbiologically confirmed infections and seroprevalence to comprehensively describe the epidemiology of pandemic H1N1 2009 influenza. Seroprevalence was determined from 1,795 random serum samples collected in our hospital in January 2007 (before the first wave of the pandemic) and March 2010 (after the second wave).

[Effect of bone-marrow mesenchymal stem cells on the immune function of aging rats].

Objective: To investigate the effect of transplantation of bone-marrow mesenchymal stem cells (MSCs) on the immune functions of aging rats.

Methods: Healthy SD rats were randomized into normal control, aging model group and MSCs group. The aging model was established by daily subcutaneous injection of D-galactose for 4 consecutive months.

[Establishment of an erythroleukemia model in CB6F1 mice by transplant with haploidentical mouse leukemic cell line FBL-3].

The purpose of study was to investigate the feasibility for establishing erythroleukemia model in CB6F1 mice by transplant with haploidentical mouse leukemic cell line FBL-3 and to explore the biological characteristics of FBL-3 cells in CB6F1 mice, CB6F1 and C57BL/6 mice were inoculated intravenously at doses of 1×10(3)-1×10(7) FBL-3 cells respectively. The survival time, the count of peripheral white blood cells, the percentage of erythroblasts and chromosome of these mice were observed. The liver, spleen, lung and kidney were obtained from the dying CB6F1 mice for pathological examination.

[An enzyme-linked immunosorbent assay for determining serum anti-themocyte globulin concentration].

Objective: To establish an enzyme-linked immunosorbent assay (ELISA) for determining anti-themocyte globulin (ATG) levels in serum samples.

Methods: The microplate was coated with mouse anti-rabbit IgG monoclonal antibody, and sheep anti-rabbit polyclonal antibody conjugated with HRP was used as the second antibody for detecting the serum ATG levels in patients undergoing allogeneic hematopoietic stem cell transplantation.

Results: The optimal concentration of the coating antibody and dilution ratios of the serum samples and IgG-HRP conjugate were 0.

[The effects of mesenchymal stem cells on the aging kidneys in rats].

Objective: To study the effect of mesenchymal stem cells on the aging rat kidney and to explore the underlying mechanism.

Methods: Rat models of senile kidney were built with hypodermic injection of D-galactose daily. Injections of MSCs of 3 x 10(6) were given to each rat through vena caudalis and CFSE was used as a tracing label to detect the distribution of MSCs in vivo.

Effectiveness of allogeneic NK cells in haploidentical bone marrow transplantation for leukemic mice.

The aim of study was to investigate the effectiveness of allogeneic natural killer (NK) cells in haploidentical bone marrow transplantation (BMT) for leukemia mice. CB6F(1)(H-2b/d) murine model of EL9611 (H-2d) erythroleukemia was established by intravenous injection of EL9611 (H-2(d)) cells. CB6F(1)(H-2b/d) mice were transplanted with bone marrow (BM) cells from C57BL/6(H-2b) mice.

[Matrine enhances the cytotoxic sensitivity of ABCG2high nasopharyngeal carcinoma cells to natural killer cells by inducing high expression of NKG2D receptor ligands].

Objective: To investigate the mechanism underlying the effects of matrine in enhancing the cytotoxic sensitivity of CNE2/DDP cells highly expressing ATP-binding cassette superfamily G member 2 (ABCG(2)(High)) to allogenic natural killer (Allo-NK) cells.

Methods: ABCG(2)(High) CNE2/DDP cells and Allo-NK cells were isolated by magnetic activated cell sorting (MACS). Flow cytometry was used to evaluate the purity of the isolated cells and the expression of NKG2D ligands on the target cells before and after incubation with matrine.

[The action of donor-derived NK cell in leukemic mice MHC haplotype-mismatched bone marrow transplantation].

Objective: To study the role of donor-derived NK cells in haploidentical bone marrow transplantation (BMT) in leukemic mice.

Methods: CB6F1(H-2b/d) mice model of EL9611 (H-2d) erythroleukemia was established by injection of EL9611 (H-2d) cells via tail vein. CB6F1(H-2b/d) mice were used as recipient, and C57BL/6(H-2b) mice as donor.

[In vitro tracing of rat bone marrow mesenchymal stem cells using the fluorescent dye CFSE].

Objective: To determine the optimal condition for labeling rat mesenchymal stem cells (MSCs) using the fluorescent dye CFSE and the maximum time length allowed by CFSE staining for MSC tracing in vitro.

Methods: Rat MSCs were labeled with CFSE at different concentrations (2.5, 5.