ETHNOPHARMACOLOGICAL RELEVANCE Plants from Kenyan flora are traditionally used against many ailments, including cancer and related diseases. Cancer is characterized as a condition with complex signs and symptoms. Recently there are recommendations that ethnopharmacological usages such as immune and skin disorders, inflammatory, infectious, parasitic and viral diseases should be taken into accou...

We compared the effects of 9-/?-o-arabinofuranosyladenine (ara-A) and its 2-fluoro derivative (F-ara-A) on DMA synthesis and viability in human leukemic lymphoblasts (CCRF-CEM). The relative DNA content and cloning capacity of the cells were determined by flow cytometry and growth in methylcellulose, respectively. Incubation with either 1 /IM ara-A in the presence of 2'-deoxycoformycin, a poten...

Thymidylate synthetase activity of a human lymphoblastic cell line, CCRF-CEM, was elevated by the addition of methotrexate to the culture medium and was lowered when cytosine arabinoside was added. The simultaneous addition of both drugs resulted in levels of enzyme activity intermediate between those observed for each drug alone. The level of enzyme activity could be modulated by varying the r...

Three phthalocyanine dyes-sensitizers were incorporated into two types of human T leukemia cells from two cell-lines: CCRF and MOLT 4. The efficiency of the dye incorporation into cells and photochemical properties of stained cells were investigated using fluorescence spectroscopy. The dyes exhibited different properties in each of the two cell-lines. Small differences in cell membrane properti...

New combined PIC-MCC approach for fast simulation of a radio frequency discharge at low gas pressure. Abstract A new combined PIC-MCC approach is developed for accurate and fast simulation of a radio frequency discharge at low gas pressure and high density of plasma. Test calculations of α − γ transition in a ccrf discharge in helium and argon show a good agreement with experimental data. We de...

5'-Deoxy-5'-methylthioadenosine and 5'-deoxy-5'-methylthioinosine, which are metabolized to the methionine precursor, 5-methylthioribose-1-phosphate, by 5'-deoxy-5'-methylthioadenosine phosphorylase and purine nucleoside phosphorylase, respectively, can serve as sources of methionine for cultured HL-60 promyelocytic leukemia cells. CCRF-CEM T-cell leukemia cells, which lack 5'-deoxy-5'-methylth...

A series of new benzothiazole derivatives 6a-h have been synthesized, in five steps, from substituted phenols via the 1,3,4-oxadiazole-2-thiones 5a-h. The in vitro antitumor activity of the compounds obtained was investigated and the benzothiazol derivatives 6d and 6e showed strong effects on leukaemia cell lines CCRF-CEM (CC50=12+/-2 micromol L(-1), 8+/-1 micromol L(-1), respectively). These c...

A new bioactive sterol glycoside, 3beta-O-(3',4'-di-O-acetyl-beta-D-arabinopyranosyl)-25xi-cholestane-3beta,5alpha,6beta,26-tetrol-26-acetate) (carijoside A, 1), was isolated from an octocoral identified as Carijoa sp. The structure of glycoside 1 was established by spectroscopic methods and by comparison with spectral data for the other known glycosides. Carijoside A (1) displayed significant ...

A series of twenty two novel 1-cyclopropyl-6-fluoro-4-oxo-7-(4-substituted piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid analogues have been synthesized, characterized ((1)H NMR, (13)C NMR and LCMS) and evaluated for their inhibitory activity on the proliferation of human caucasian acute lymphoblastic leukemia cells (CCRF-CEM), breast adenocarcinoma cells (MDA-MB-468) and human colon c...