in European Journal of Cell Biology (1988), 47(2), 346-57. In order to investigate the DNA localization within Ehrlich tumor cell nucleoli during mitosis, two recent immunocytochemical methods using either an anti-DNA or an anti-bromodeoxyuridine (BrdU ... [more ▼]. In order to investigate the DNA localization within Ehrlich tumor cell nucleoli during mitosis, two recent immunocytochemical methods using either an anti-DNA or an anti-bromodeoxyuridine (BrdU) monoclonal antibody have been applied. In both cases, the immunogold labeling has been performed on ultrathin sections of cells embedded either in Lowicryl K4M or in Epon, respectively. Identical results are observed with both immunocytochemical approaches. In the interphase nucleolus, besides the labeling of the perinucleolar chromatin shell and of its intranucleolar invaginations which penetrate into the nucleolar body and often terminate at the fibrillar centers, a few gold particles are also preferentially found towards the peripheral ...
BioAssay record AID 118144 submitted by ChEMBL: Effect of compound on Ehrlich ascites carcinoma growth in CF1 mice at a dose ((20 mg/kg)/day) ip survival at day 9 packed cell volume as a percent.
en] Here we describe a new, rapid method for isolating nucleoli from Ehrlich tumor cells that preserves their morphological integrity and high transcriptional activity. Until now, methods for isolation of nucleoli were generally assumed to empty one of their three main compartments, the fibrillar center, of its contents. This new method consists of sonicating cells in an isotonic medium containing MgSO(4), spermidine, and spermine, followed by separation of nucleoli through a Percoll density gradient. Using the nonisotopic approach of labelling with BrUTP, we have further investigated the dynamics of nascent ribosomal RNAs (rRNAs) within morphologically intact isolated nucleoli at the electron microscope level. We show that ribosomal transcripts are elongated in the cortex of the fibrillar center and then enter the surrounding dense fibrillar component ...
Ca2+ uptake into Ehrlich ascites tumor cells was studied at 0°C in the presence of mitochondrial inhibitors, conditions that minimized complications caused by sequestration of Ca2+ into organelles or by excretion. Under these conditions Ruthenium Red inhibited Ca2+ uptake, but other previously implicated ions, such as Pi or Mg2+, had no effect. Valinomycin either inhibited or slightly stimulated Ca2+ uptake depending on the presence of excess K+ on the outside or inside of the cell, respectively. Nigericin inhibited Ca2+ transport. Based on these data we propose an electrogenic uptake of Ca2+, possibly via a Ca2+/H+ antiport mechanism. The observation that glucose inhibited Ca2+ uptake suggested that in Ehrlich ascites tumor cells an energy-driven Ca2+ expulsion mechanism is operative, similar to that in erythrocytes. Plasma membrane preparations of ascites tumor cells were found to contain a Ca2+-dependent ATPase. These preparations, when incorporated into liposomes in an inside-out orientation,
1. The formation of adenosine 5-phosphate, guanosine 5-phosphate and inosine 5-phosphate from [8-(14)C]adenine, [8-(14)C]guanine and [8-(14)C]hypoxanthine respectively in the presence of 5-phosphoribosyl pyrophosphate and an extract from Ehrlich ascites-tumour cells was assayed by a method involving liquid-scintillation counting of the radioactive nucleotides on diethylaminoethylcellulose paper. The results obtained with guanine were confirmed by a spectrophotometric assay which was also used to assay the conversion of 6-mercaptopurine and 5-phosphoribosyl pyrophosphate into 6-thioinosine 5-phosphate in the presence of 6-mercaptopurine phosphoribosyltransferase from these cells. 2. At pH 7.8 and 25 degrees the Michaelis constants for adenine, guanine and hypoxanthine were 0.9 mum, 2.9 mum and 11.0 mum in the assay with radioactive purines; the Michaelis constant for guanine in the spectrophotometric assay was 2.6 mum. At pH 7.9 the Michaelis constant for 6-mercaptopurine was 10.9 mum. 3. 25 mum-6
en] The cellular effects of dihydroflavopereirine and sempervirine ( two alkaloids isolated from Loganiaceae) are analysed by cytological methods in experimental tumours cultivated in vitro ( B16 mouse melanoma cells, mouse Ehrlich tumour cells ELT). Under some experimental conditions, a certain degree of antimitotic activity is demonstrated and related to the molecular structure ...
A comparison of the cytidine 5′-diphosphate (CDP) and adenosine 5′-diphosphate (ADP) reductase activities from Ehrlich tumor cells was made to determine if the properties of the enzyme for these substrates were the same, except for the allosteric effector. It was observed that various purification steps did not result in an enzyme fraction that had a constant ratio of CDP:ADP reductase activities. The optimal Mg2+ ion concentration for CDP reduction was 3 to 4 mm, while the optimal Mg2+ ion concentration for ADP reduction was 0.1 mm. Concentrations of Mg2+ ions greater than 0.1 mm inhibited ADP reduction. CDP reduction was relatively insensitive to the presence of dimethylformamide or dimethyl sulfoxide in the reaction mixture, but ADP reduction was decreased in the presence of these two compounds. Periodate-oxidized adenosine 5′-monophosphate, on incubation with the enzyme, had a greater effect on CDP reduction but little or no effect on ADP reduction. The response of the CDP and ADP ...
INTRODUCTION: Fluoroacetate (FA) is a highly toxic metabolic poison found in eight species of plants - including Dichapetalum and Gastrolobium - growing in Australia, South and Central Africa and South America. The level of FA in some plants can reach up to 5 g kg-1 dry weight and can cause death of livestock and domestic animals. Moreover, FA can be found in fog and rain-drops in some industrial regions. The best known representative of FA is its sodium salt (SFA, compound 1080), which is used in several countries for controlling populations of some vertebrates. Although extremely toxic, FA has positive properties: it can prevent development of tolerance to morphine, and has radioprotective power due to its capacity to reduce body temperature and oxygen consumption. OBJECTIVES: To evaluate the antitumor properties of SFA in monotherapy regime and in combination with a known antitumor compound. MATERIALS AND METHODS: Mice bearing Ehrlich tumor carcinoma were treated daily with SFA, 1.25mg/kg ...
The popularity of fermented foods such as kefir, kuniss, and tofu has been greatly increasing over the past several decades, and the ability of probiotic bacteria to exert anticancer effects has recently become the focus of research. While we have recently demonstrated the ability of the novel kefir product PFT (Probiotics Fermentation Technology) to exert anticancer effects in vitro, here we demonstrate its ability to inhibit Ehrlich ascites carcinoma (EAC) in mice. Mice were inoculated intramuscularly with EAC cells to develop solid tumors. PFT was administered orally (2 g/kg/day) to mice 6 days/week, either 2 days before tumor cell inoculation or 9 days after inoculation to mice bearing solid tumors. Tumor growth, blood lymphocyte levels, cell cycle progression, apoptosis, apoptotic regulator expression, TNF-α expression, changes in mitochondrial membrane potential (MMP), PCNA, and CD4+ and CD8+ T cells in tumor cells were quantitatively evaluated by flow cytometry or RT-PCR. Further studies in
Lassen, U; Nielsen, A; Pape, L; and Simonsen, L, "The membrane potential of ehrlich ascites tumor cells, microelectrode measurements and their critical evaluation." (1971). Subject Strain Bibliography 1971. 2022 ...
Simonsen, L O. and Cornelius, F, "Inorganic phosphate in ehrlich ascites tumor cells and its distribution across the cell membrane." (1978). Subject Strain Bibliography 1978. 3326 ...
Treatment of the 1-day-old Ehrlich ascites tumor with combinations of selected doses of l-asparaginase and the l-glutamine antagonist, 6-diazo-5-oxo-l-norleucine, or of the l-glutamine acid antagonist, dl-methionine-dl-sulfoximine, produced significantly more growth inhibition without a marked increase in host toxicity than did treatment with l-asparaginase administered alone. In the 3-day-old tumor treated with the combination of l-asparaginase and 6-diazo-5-oxo-l-norleucine, there was a significant enhancement of growth inhibition as compared with the effect of either drug used alone. A less significant increase of growth inhibition was obtained with combination of l-asparaginase and l-glutamyl-γ-hydrazide as compared with the effect of this chemical administered alone.. Combinations of l-asparaginase and 6-diazo-5-oxo-l-norleucine produced increased antitumor effects in mouse melanoma B16 and to a lesser degree in the solid form of Ehrlich tumor and Walker carcinosarcoma 256 of the ...
TY - JOUR. T1 - N-Bromoacetyl-β-D-glucosamine tetra-O-acetate and N-bromoacetyl-β-D-galactosamine tetra-O-acetate as chemotherapeutic agents with immunopotentiating effects in Ehrlich ascites tumor-bearing mice. AU - Simon, P.. AU - Burlingham, W. J.. AU - Conklin, R.. AU - Fondy, Thomas P. PY - 1979. Y1 - 1979. N2 - N-Bromoacetyl-β-D-glucosamine tetra-O-acetate (NBrAcGlc-TA) and N-bromoacetyl-β-D-galactosamine tetra-O-acetate (NBrAcGal-TA) produced strong in vitro cytotoxicity against both Ehrlich and L1210 leukemia dividing cell lines at μM concentrations. A single administration i.p. at one-half the dose lethal to 10% of the animals of either agent cured 85% of Ehrlich ascites tumor-bearing C57BL/6J x DBA/2 (hereafter called B6D2F1) mice. Animals immunosuppressed by prior X-irradiation could not be cured by these agents. The corresponding chloro and fluoroderivatives and the non-O-acetylated N-haloacetylhexosamines were inactive in vitro and in vivo. No significant effect against L1210 ...
Glutathione metabolism was studied in cancer cells during the growth of an Ehrlich ascites tumour. GSH, but not GSSG, content decreases when cell proliferation and the rate of protein synthesis in the tumour decrease. This change correlates with a decrease in the rate of GSH synthesis and an increase in glutathione peroxidase and glutathione S-transferase activities. Glutathione efflux from tumour cells seems to co-ordinate with the rate of GSH synthesis. Cysteine, and not methionine, promotes GSH synthesis in tumour cells. However, changes in the rate of GSH synthesis are not due to limitations in the supply of blood cysteine or to changes in the intracellular amino acid pool of the cancer cells. Our data suggest that changes in protein metabolism accompanying tumour growth in vivo can modulate glutathione content in cancer cells. ...
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TY - JOUR. T1 - Evaluation of intraperitoneal vincristine in malignant peritoneal effusion. AU - Bairy, K. L.. AU - Sanath, S.. AU - Jagetia, G. C.. AU - Somayaji, S. N.. AU - Vidyasagar, M. S.. AU - Baliga, M. S.. PY - 2003/1/1. Y1 - 2003/1/1. N2 - The efficacy and safety of intraperitoneal administration of vincristine sulphate was determined in mice bearing Ehrlich ascitic carcinoma. The tumor bearing animals were administered with 0.5 mg/kg body weight (b.wt) of freshly prepared vincristine sulphate intraperitoneally on day 6 after tumor transplantation followed by drug administration once daily 5 days a week consecutively. The observations regarding the survival, alteration in the volume of peritoneal fluid, increase in life span and pathological changes in the liver, kidney, gastrointestinal tract and bone tissues were made. The vincristine sulphate treatment reduced the malignant cell population significantly and there were no significant changes in the histological picture of liver, ...
We have developed a simple and rapid method for isolation of purified nuclear lamina from Ehrlich ascites tumor cells. The procedure employs chromatin structures prepared from whole cells at low ionic strength and is carried out under conditions that minimize the formation of artifactual... mehr ...
4,4-Diisothiocyano-2,2-stilbenedisulfonic acid (DIDS) is an anion exchange inhibitor, blocking reversibly, and later irreversibly, exchangers such as chloride-bicarbonate exchanger. Jessen, Flemming; Sjøholm, C; Hoffmann, EK (1986), "Identification of the anion exchange protein of ehrlich cells: A kinetic analysis of the inhibitory effects of 4,4′-diisothiocyano-2,2′-stilbene-disulfonic acid (DIDS) and labeling of membrane proteins with3H-DIDS", Journal of Membrane Biology, 92 (3): 195, doi:10.1007/BF01869388, PMID 3783658 Lane, Michelle; Baltz, Jay M.; Bavister, Barry D. (1999), "Bicarbonate/Chloride Exchange Regulates Intracellular pH of Embryos but Not Oocytes of the Hamster", Biology of Reproduction, 61 (2): 452-457, doi:10.1095/biolreprod61.2.452, PMID 10411526 ...
A novel protein target of mouse calcyclin (S100A6) was detected by a gel overlay method with 125I-labelled calcyclin. Interaction of calcyclin with its 30 kDa target protein (p30) present in Ehrlich ascites tumour (EAT) cells depended on the presence of Ca2+ ions. The binding of p30, evidenced by the reaction with 125I-labelled calcyclin, was found to be of higher affinity than the binding between mouse calcyclin and annexin II or glyceraldehyde-3-phosphate dehydrogenase. Examination of tissue extracts by the gel overlay method has shown that p30 is present not only in the EAT cells but also in mouse brain and spleen. This novel target protein of mouse calcyclin was purified to homogeneity from EAT cells by means of Phenyl-Sepharose chromatography, affinity chromatography and CM-cellulose chromatography. Purified p30 was digested with α-chymotrypsin and a partial amino acid sequence of one of the resulting peptides was established. A database search analysis revealed that the sequence is ...
Radiosenstitizing effects of combination of a minor groove DNA ligand, Hoechst-33342, with the glucose analogue and inhibitor of glycolysis, 2-deoxy-D-glucose (2-DG) have been investigated in Ehrlich ascites tumour (EAT) bearing mice following focal irradiation of the tumour with 60Co gamma-rays. Treatment-induced tumour growth delay and tumour free animal survival were evaluated as parameters of radiation response. Focal irradiation of the tumour with a single fraction of 10 Gy induced a moderate delay in tumour growth but did not lead to complete regression in any of the tumours. Intravenous administration of H-342 1 hr before irradiation enhanced radiation-induced growth delay in a dose dependent manner. Complete regression of the tumour was observed only at a dose of 10 mg/kg body wt, leading to a cure (tumour free survival for more than 100 days) rate of 55%. Administration of 2-DG (2 g/kg body wt; iv), immediately before irradiation significantly enhanced radiation-induced growth delay and ...
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Our Ladys Childrens Hospital, Crumlin has apologised to 18 families who were wrongly identified as being at the centre of a contamination scare over a medical scope.