Objective: Silymarin is a herbal extract containing flavonolignans, and it has inhibitory effects against the growth of different cancer cell lines by inducing apoptosis. Toll-like receptors are suggested as a novel and attractive target to treat cancer. The current study aimed at examining the mechanism of silymarin-induced apoptosis in Ramos cells and investigating its effect...

Huachansu (HCS), a hot water extract of the skin glands of Bufo gargarizans (B. melanostictus), has been used extensively in the treatment of various solid tumors in Asia, particularly in China. However, its effect on the growth of malignancies of hematopoietic origin, particularly lymphomas, is limited. Here we investigated the antiproliferative effect and molecular mechanisms of HCS using non...

The present study investigates the mechanism behind induction of cell death by eicosapentaenoic acid (EPA) in leukemia cells. The PUFA-sensitive cell lines Raji and Ramos, which die by necrosis and apoptosis upon incubation with EPA respectively, had 2- to 3-fold higher uptake rate of EPA than the PUFA-resistant U-698 cell line. Furthermore, Ramos cells contained more lipid bodies and 3-fold mo...

Macrophages can remove antigen from the surface of antibody-coated cells by a process termed trogocytosis. Using live cell microscopy and flow cytometry, we investigated the dynamics of trogocytosis by RAW264.7 macrophages of Ramos B cells opsonized with the anti-CD20 monoclonal antibody rituximab. Spontaneous and reversible formation of uropods was observed on Ramos cells, and these showed a s...

The aim of the present study was to investigate the role of Cyclic-nucleotide Response Element-Binding (CREB) family members and related nuclear transcription factors in the radiation response of human B lymphoma cell lines (Daudi and Ramos). Unlike the more radiosensitive Daudi cells, Ramos cells demonstrated only a moderate increase in early apoptosis after 3-5 Gy irradiation doses, which was...

Most human lymphoid cell lines contain multiple copies of circular, nonintegrated Epstein-Barr virus (EBV) DNA molecules as well as viral DNA sequences with properties of integrated DNA. The physical state of the EBV DNA in a human lymphoma line that only contains one virus genome equivalent per cell has now been studied by three different methods, neutral CsCl density gradient centrifugation, ...

Recombinant human rhApo2L/TRAIL selectively stimulates apoptosis in various cancer cells through its receptors DR4 and DR5, and is currently in clinical trials. Preclinical studies have established antitumor activity of rhApo2L/TRAIL in models of epithelial cancers; however, efficacy in non-Hodgkin lymphoma (NHL) models is not well studied. Of 7 NHL cell lines tested in vitro, rhApo2L/TRAIL sti...

Using ChIP Seq, we identified 556 and 467 putative STAT6 target sites in the Burkitt's lymphoma cell line Ramos and in the normal lung epithelial cell line BEAS2B, respectively. We also examined the positions and expression of transcriptional start sites (TSSs) in these cells using our TSS Seq method. We observed that 44 and 132 genes in Ramos and BEAS2B, respectively, had STAT6 binding sites i...

Rituximab treatment of B non-Hodgkin’s lymphoma (NHL) cell lines inhibits the constitutive NFB activity and results in the sensitization of tumor cells to both chemotherapy and Fas-induced apoptosis. Cells expressing dominant active I B or treated with NFB-specific inhibitors were sensitive to both drugs and Fas agonist mAb (CH-11)-induced apoptosis. Down-regulation of Bcl-xL expression via inh...

Contact with bone marrow stromal cells is crucial for the normal growth and development of B-cell precursors. We have previously shown that human bone marrow stromal cell tyrosine kinase activity can be activated by direct contact with B-lymphoid cells (J Immunol 155:2359, 1995). In the present study, we show that increased tyrosine phosphorylation of focal adhesion kinase, paxillin, and extrac...