The melanoma differentiation-associated gene-7/interleukin-24 (MDA-7/IL-24) is a novel candidate of tumor suppressor, which can experimentally inhibit the proliferation of cancer cells and induce apoptosis of various human malignant cells.
Apoptosis ; Cell Proliferation ; Genetic Therapy ; methods ; Humans ; Interleukins ; biosynthesis ; genetics ; Neoplasms ; metabolism ; pathology ; therapy ; Tumor Suppressor Proteins ; biosynthesis ; genetics

OBJECTIVETo investigate the effects of interleukin 7 (IL-7) on B7 molecules expression and immunogenicity of acute leukemia (AL) cells.

METHODSThe B7 molecules expression on fresh acute leukemia cells and on the IL-7 exposed leukemia cells was detected by FACScan cytometer. B7-1 and B7-2 mRNA in IL-7 treated HL-60 cells were detected by reverse transcription-PCR (RT-PCR). The stimulation of proliferation of allogeneic peripheral blood mononuclear cells (PBMNC) by IL-7 treated leukemia cells was detected by MTT method. The level of interferon-gamma (IFN-gamma) secreted by the stimulated PBMNC was determined using enzyme-linked immunosorbent assays (ELISA). The blocking experiments were performed using monoclonal antibodies against B7-1, B7-2 and W6/32.

RESULTSB7-1 was weakly expressed in three, whereas B7-2 did in only one of eleven AL patients. IL-7 significantly enhanced B7 molecules expression on AL cells in a time-dependent manner. Furthermore, IL-7 could induce higher expression of B7-1 and B7-2 mRNAs on HL-60 cells. IL-7 treated leukemia cells could stimulate PBMNC proliferation and promote their IFN-gamma production. Anti-B7-1 and anti W6/32 but not anti-B7-2 monoclonal antibodies significantly inhibited the stimulated PBMNC proliferation and IFN-gamma secretion.

CONCLUSIONFresh AL cells express low level of B7-1 and B7-2 molecules. IL-7 enhances the B7 molecules expression on AL cells. The IL-7-treated leukemia cells can significantly stimulate the proliferation of allogeneic PBMNC and induce their IFN gamma secretion.

B7-1 Antigen ; genetics ; metabolism ; B7-2 Antigen ; genetics ; metabolism ; Humans ; Interleukin-7 ; pharmacology ; Leukemia ; immunology ; metabolism ; RNA, Messenger ; genetics ; Tumor Cells, Cultured ; Up-Regulation ; drug effects

Sixteen compounds including daphnoretin (1), isofraxidin (2), scopoletin (3), kaempferol (4), quercetin (5), guaijaverin (6), astragalin (7), quercetin-3-O-β-D-glucopyranoside (8), naringenin-7-O-β-D-glucopyranoside (9), 5-O-methylapi- genin-7-O-β-D-glucopyranoside (10), methyl gallate (11), prionitiside A (12), (2S)-2,3-dihydroxypropyl-1,6,8-trihydroxy-3- methyl-9,10- dioxoanthracene-2-carboxylate (13), 3,3'-di-O-methyl ellagic acid (14), 3'-O-methyl-3,4-O,O-metheneellagic acid-4'-O-β-D- glucopyranoside (15) and 3,4-methylenedioxy-3'-O-methylellagic acid (16), were isolated from the 70% acetone extract of Euphorbia dracunculoides Lam. Among them, compounds 1-3, 6-9, 11, and 14 were isolated from E. dracunculoides for the first time, and compounds 10, 12, 13, 15, and 16 were firstly obtained from the genus Euphorbia. Their structures were elucidated by spectroscopic analysis, including 1H-NMR, 13C-NMR, and ESI-MS.
Drugs, Chinese Herbal ; chemistry ; isolation & purification ; Euphorbia ; chemistry ; Molecular Structure ; Plant Leaves ; chemistry ; Plant Stems ; chemistry ; Spectrometry, Mass, Electrospray Ionization

Acute myeloid leukemia (AML) is a common type of hematopoietic malignancies seriously threatening human life. Resistance to chemotherapy is one of the main reasons for recurrence and refractoriness of acute myeloid leukemia. The mechanisms of chemoresistance are complex. This article reviews the mechanisms of chemoresistance in acute myeloid leukemia,the current research advances and the possible approach for reverse of drug resistance.
Drug Resistance, Neoplasm ; physiology ; Humans ; Leukemia, Myeloid, Acute ; drug therapy ; physiopathology

OBJECTIVETo investigate the effect of histone deacetylase inhibitor suberic bishydroxamate (SBHA) on human acute myeloid leukemia (AML) cell lines.

METHODSAML U937, KG-1 and Kasumi-1 cells were treated with SBHA. Cell growth was measured by MTT assay. Apoptosis was determined using flow cytometry. Activation of Caspase pathway and expression of apoptosis regulator proteins were detected by Western blot.

RESULTSSBHA significantly induced growth arrest and apoptosis in U937, KG-1 and Kasumi-1 cells. Enhanced apoptosis was observed in SHBA group evidenced by strong activation of Caspase-9, Caspase-8 and Caspase-3. SHBA treatment resulted in down-regulation of anti-apoptotic protein Bcl-2 and Bcl-xl expression; down-regulated expression of antiapoptotic proteins survivin, XIAP and cIAP was also detected after SBHA treatment.

CONCLUSIONSBHA can effectively kill AML cells by inhibiting cell growth and inducing apoptosis, which is associated with the activation of Caspase pathway and regulation of apoptotic related proteins.

Apoptosis ; drug effects ; Apoptosis Regulatory Proteins ; metabolism ; Caspases ; metabolism ; Cell Line, Tumor ; Histone Deacetylase Inhibitors ; pharmacology ; Humans ; Hydroxamic Acids ; pharmacology ; Leukemia, Myeloid, Acute ; metabolism ; pathology

OBJECTIVETo investigate the effect of aurora kinase inhibitor ENMD-2076 on human acute myelogenous leukemia (AML) cell lines.

METHODSAML THP-1 and Kasumi-1 cells were treated with ENMD-2076 for 24 h and 48 h,respectively. Cell growth was measured by MTT assay. Apoptosis was determined using Hoechst staining apoptosis detection kit. Activation of Caspase pathway and expression of apoptosis regulator proteins were detected by Western blot.

RESULTSENMD-2076 significantly induced growth arrest and apoptosis in THP-1 and Kasumi-1 cells. Enhanced apoptosis was observed in ENMD-2076 group evidenced by strong activation of Caspase-9,Caspase-3 and PARP. Furthermore,the ENMD-2076 treatment resulted in down-regulation of anti-apoptotic protein Mcl-1 expression. Also,up-regulated expression of pro-apoptotic protein Bak,Bad and Bax was detected after ENMD-2076 treatment.

CONCLUSIONENMD-2076 can kill effectively AML cells by inhibiting cell growth and inducing apoptosis,which is associated with activation of Caspase pathway and regulation of pro-apoptotic and anti-apoptotic proteins.

Apoptosis ; drug effects ; Apoptosis Regulatory Proteins ; metabolism ; Aurora Kinases ; Caspases ; metabolism ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; Humans ; Leukemia, Myeloid, Acute ; metabolism ; pathology ; Protein-Serine-Threonine Kinases ; antagonists & inhibitors ; Pyrazoles ; pharmacology ; Pyrimidines ; pharmacology

Drug Delivery Systems ; Humans ; Leukemia, Myeloid, Acute ; drug therapy

Objective To explore the main influence factors(heart rate,rotation speed,and reconstruction algorithm)on the image quality of coronary artery with 40 mm VCT(64-detector row helical CT)using a pulsating cardiac phantom.Methods An adjustable pulsating cardiac phantom(GE) containing predetermined simulated coronary arteries was scanned using a 40 mm VCT(GE LightSpeed CT) with cardiac pulsating rates of 40,45,50,55,60,65,70,75,80,85,90,95,100,105,110,and 115 beats per minute(bpm).The variable rotation speeds technique of 0.35 s,0.40 s,and 0.45 s were used, respectively.The raw data were reconstructed using both one-sector and multi-sector reconstruction algorithm at optimal window of the R-R interval.The image quality score(IQS)was evaluated by two radiologists according to the same evaluation standard of reformated image.The correlation between heart rate(HR), roation speed,reconstruction algorithm,and IQS were analyzed.The IQS as independent variable and the HR,rotation speed,reconstruction algorithm as dependent variables were analyzed by multiple linear regression analysis.Restllts The heart rate and the reconstruction algorithm had significant influence on IQS.The rotation speed(0.35s,0.40s,and 0.45s)didn't have significant influence on IQS.There was linear regression relationship between heart rate,reconstruction algorithm and IQS(P

OBJECTIVETo discuss the anti-tumor effect of Xihuang pill on tumor-bearing rats and its effect on the immune clearance function of tumor-bearing organisms.

METHODWalker256 tumor cells were adopted to establish the tumor-bearing rat model. The rats were randomly divided into five groups: the normal control group, the model control group, the lentinan group and Xihuang pill low dose, middle dose and high dose groups, with 10 rats in each group, and continuously treated and given drugs for 14 d after modeling. Blood and tumors were collected from abdominal aorta to calculate the tumor inhibition rate. The content of CD3+, CD4+, CD8+ T cells and adhesion molecule B7-1 (CD80) in peripheral blood were detected by flow cytometry (FCM). The expressions of IL-2 and IFN-gamma in were determined by ELISA.

RESULTThe tumor inhibition rate of the Xihuang pill high dose group was 33. 1 percent. Compared with the model group, the Xihuang pill large dose group showed significantly low IL-2, IFN-gamma, CD3+, CD4+, B7-1 in peripheral blood, with statistical significance in their differences (P < 0.05).

CONCLUSIONXihuang pill could show its anti-tumor effect by enhancing the immune clearance function and increasing IL-2, IFN-gamma, CD3+ T, CD4+ T, B7-1 in peripheral blood.

Animals ; Antineoplastic Agents ; administration & dosage ; B7-1 Antigen ; genetics ; immunology ; Breast Neoplasms ; drug therapy ; genetics ; immunology ; CD4-Positive T-Lymphocytes ; drug effects ; immunology ; Drugs, Chinese Herbal ; administration & dosage ; Female ; Flow Cytometry ; Humans ; Immune System ; drug effects ; Immunologic Factors ; administration & dosage ; Interferon-gamma ; genetics ; immunology ; Interleukin-2 ; genetics ; immunology ; Rats ; Rats, Wistar ; Tumor Burden ; drug effects

Autophagy is a process of bulk degradation of proteins and organelles in cytoplasm.Autophagy has many normal physiological functions in cellular catabolism; therefore is essential for cell homeostasis. In some circumstances autophagy can induces cell death, namely autophagic cell death. Recent studies have suggested that autophagy plays an important role in both normal tissue development and a variety of diseases, including cancer. Therefore, the strategy targeting autophagy pathway may represent a new way of cancer treatment.
Apoptosis ; physiology ; Autophagy ; physiology ; Cell Death ; physiology ; Hematologic Neoplasms ; pathology ; physiopathology ; Signal Transduction