A comparative chromosomal analysis was made of 10 human lymphoblastoid cell lines, four of which originated from normal donor lymphocytes and six of which were from leukemic peripheral blood. For comparison of lymphoblastoid cells with respect to their normal or leukemic origin, cytogenetic studies have been carried out regularly since the beginning of the culture during more than 3 years. Samp...

Objectives: Andrographis paniculata (A. paniculata) is a widely used herb that has potential medical properties. Andrographolide (Andro) is the major component of A. paniculata. We evaluated the anti-tumor activity of Andro using leukemic cell line cells. Methods: Leukemic cell lines U937, HL60 or H929 cells were cultured in the presence or absence of Andro and compared with the effects of Ara-...

The drug-resistant leukemic cell lines, CEM/VLBlm and K/ DAU-, are more sensitive to tumor necrosis factor a (TNFa)-mediated cytotoxicity compared with their parental cell lines, CCRF-CEM and K562 c1.6. Drugresistant leukemic cell lines have more active mitochondrial function, which is associated with a greater susceptibility to TNFa-induced respiratory inhibition. TNFa blocked electron tran...

It has been shown that the novel synthetic triterpenoid CDDO inhibits proliferation and induces differentiation and apoptosis in myeloid leukemia cells. In the current study the effects of the C-28 methyl ester of CDDO, CDDO-Me, were analyzed on cell growth and apoptosis of leukemic cell lines and primary acute myelogenous leukemia (AML). CDDO-Me decreased the viability of leukemic cell lines, ...

Rhesus monkeys were immunized with normal human lymphoid cells, cultured lymphoid cells, and chronic leukemic lymphocytes. Antisera were analyzed by cytotoxicity and immunofluorescence techniques to study the antigenic characteristics of human lymphocytes. In an attempt to obtain a reagent specifically reactive with T (thymus-derived) lymphocytes, an antispleen antiserum was absorbed with cellf...

Treatment of human promonocytic leukemic cell line U937 with mild hyperthermia in the temperature range of 40-43°C resulted in differentiation of these cells into monocyte/macrophage-like cells in a heat dose and time dependent manner. This process was accompanied by marked morphological, functional and proliferational changes. U937 cells which normally grow in supension in the logarithmic...

In acute myeloid leukemia (AML), receptor tyrosine kinase ligands promote growth and survival and contribute to AML-associated marrow neoangiogenesis. We have tested simultaneous inhibition of vascular endothelial growth factor, fibroblast growth factor, and platelet-derived growth factor receptor signaling by novel indolinone derivatives using 14 myeloid, including 11 human leukemic, cell line...

Epigenetic therapy reverting aberrant acetylation or methylation offers the possibility to target preferentially tumor cells and to preserve normal cells. Combination epigenetic therapy may further improve the effect of individual drugs. We investigated combined action of demethylating agent decitabine and histone deacetylase inhibitor SAHA (Vorinostat) on different leukemic cell lines in compa...

The wild-type (wt) p53 tumor suppressor gene is commonly inactivated in human malignancies, either by mutations or by loss of expression. An additional proposed mechanism for inactivation of wt-p53 is amplification of the murine double minute 2 (MDM2) gene and overexpression of the MDM2 protein, which binds to p53 and eliminates its tumor suppressor function. To investigate a potential role for...

Stable human leukemia-lymphoma cell lines provide model systems to study the processes involved in leukemic and normal cell differentiation [10]. Leukemic cells, arrested at a certain stage of differentiation, can be triggered to differentiate to functionally and morphologically more mature cells [7]. Both "fresh" leukemic cells and cells maintained in long-term culture are sensitive to in vitr...