Lappuse 1 no 51 rezultātiem
The dose limiting toxicity of difluoromethylornithine (DFMO), when administered by continuous infusion, is thrombocytopenia. DFMO-induced antitumor activity and thrombocytopenia were time- and dose-dependent up to 1700 mg/kg/d when administered continuously for 12 days. Concomitant ornithine
The initial cytogenetic analysis of a biphasic synovial sarcoma revealed complex anomalies involving six different chromosomes: 46,Y,t(X;18;5;4)(p11;q11;p13;q12),t(2;5)(q35;q11). After fluorescence in situ hybridization (FISH) analysis, using chromosome X-specific plasmid library and YAC probes, the
DL-alpha-Hydrazino-delta-aminovaleric acid (DL-HAVA) is a potent and fairly specific inhibitor of ornithine decarboxylase (EC 4.1.1.17). Its effect on polyamine metabolism and cell proliferation was investigated in sarcoma-180, inoculated into the axillary region of mice. In the tumor tissues, the
Ornithine decarboxylase (ODC) induction during G1 phase of the cell cycle was compared in Rat-1 fibroblasts and in Rat-1 fibroblasts transformed by the B77 wild-type Rous sarcoma virus (RSV) and by the thermosensitive mutant LA24/RSV. In Rat-1 cells, maximal enzyme activity detectable at mid G1
OBJECTIVE
Ornithine alpha-ketoglutarate (OKG) is recognized to improve nutritional status in various catabolic states, such as burn injury, trauma, and sepsis. However, in wasting diseases, such as induced by cancer, the data are scarce and the precise mechanisms by which OKG acts on protein
Tumor cell kinetics were studied in C57 Bl/J mice with a transplantable sarcoma, MCG 101, exposed to hyperbaric oxygen (HBO2), 2.8 atm abs, 2 hours daily for 9 days or until spontaneous death. The isoenzymatic pattern of lactate dehydrogenase (LDH) confirmed that there was a significant shift toward
In vitro exposure of Syrian hamster fetal cells to nickel subsulfide (alpha Ni3S2) yielded positive colony assays for morphological transformation. A dose-response relationship was found between the concentration of alpha Ni3S2 and the incidence of morphological transformation. Exposures of alpha
When monolayer Chinese hamster cells are treated with trypsin for short periods of time, ornithine decarboxylase (ODCase) activity increases two- to fourfold. This increase can be blocked by aprotinin, a protease inhibitor, and is not observed when cultures are dislodged from substrate mechanically
BACKGROUND
Polyamines are low molecular weight cations that are essential for the growth of all cells. The polyamine inhibitor difluoromethylornithine (DFMO) will decrease tumor growth when administered parenterally; thrombocytopenia is the major dose-limiting toxicity. Since an essential amino
(2R,5R)-6-Heptyne-2,5-diamine hydrochloride (MDL 72175) is a new, potent, and selective inhibitor of mammalian ornithine decarboxylase. MDL 72175 given p.o. in drinking fluid reduced by 80% the growth of EMT6 sarcoma in mice and of HTC hepatoma in rats. It prolonged the survival of mice bearing