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Stranica 1 iz 175 rezultatima
A net gain of sodium ions and a net loss of potassium ions accompanying the uptake of glycine by mouse ascites-tumour cells in the presence of sodium cyanide.
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1. The tumour cells were starved in a solution lacking Na(+) and then transferred to a Ringer solution containing 2mm-sodium cyanide, 150m-equiv. of Na(+)/l. and 10m-equiv. of K(+)/l. Such cells were depleted of ATP and contained an endogenous pool of various amino acids equivalent to a 26mm
The effects of varying the cellular and extracellular concentrations of sodium and potassium ions on the uptake of glycine by mouse ascites-tumour cells in the presence and absence of sodium cyanide.
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1. Tumour cells were starved to deplete them of ATP and transferred to 0.9mm-glycine in Ringer solutions containing 2mm-sodium cyanide and various Na(+) and K(+) concentrations. The uptake of glycine then usually reached a peak by about 10min. 2. When cellular [Na(+)] and extracellular [Na(+)] were
Apoptosis-inducing ability of silver(I) cyanide-phosphines useful for anti-cancer studies.
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Metal-based drugs have shown early promise as anticancer agents suggesting the potential application of silver(I) complexes as apoptosis-inducing agents. The ability of a silver(I) cyanide containing phosphine complex to induce cell death was evaluated in both a malignant (SNO esophageal cancer) and
Antibody-guided enzyme therapy of cancer producing cyanide results in necrosis of targeted cells.
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A number of enzyme/prodrug activation approaches for the treatment of cancer have been reported to date with varying success. We describe progress in the development of a system based on a beta-glucosidase enzyme in combination with a naturally occurring "prodrug," the sugar linamarin, which
Binding of saframycin A, a heterocyclic quinone anti-tumor antibiotic to DNA as revealed by the use of the antibiotic labeled with [14C]tyrosine or [14C]cyanide.
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Saframycin A is antitumor antibiotic structurally characterized by twin heterocyclic quinone skeletons and alpha-cyanoamine moiety. The binding of saframycin A to DNA was investigated using the antibiotic labeled at different positions. Heterocyclic quinone skeletons were biosynthetically labeled
Unproven methods of cancer management. Laetrile.
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"Laetrile" is used interchangeably with "amygdalin" to designate natural substances, derived primarily from apricots and almonds, that can release cyanide, which is lethal to living organisms. In the 1920s, Dr. Ernst T. Krebs, Sr., formulated a theory that amygdalin could kill cancer cells. His
Autophagy induction as an efficient strategy to eradicate tumors.
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The understanding of the mechanisms of cell-death execution and the role that they play in different diseases opens new therapeutic strategies. Currently, increasing evidence indicates that autophagy is a frequent cell-death mechanism, so the question arises: Could autophagy stimulation be
Therapy mediated by mitophagy abrogates tumor progression.
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Autophagy is mainly a cellular recycling process that promotes survival, but it can also cause cell death if cell injury persists. The role of mitophagy in tumorigenesis remains uncertain. Other cell death types, such as apoptosis or necrosis, are often altered during tumor development and therefore
Cerebrospinal fluid cyanide after nitroprusside infusion in man.
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Sodium nitroprusside (SNP) is frequently used as an hypotensive agent for clipping of intracranial aneurysms, repair of arteriovenous malformations and resection of vascular tumours. Cyanide (CN), which is its main metabolic product, has been recovered from the cerebrospinal fluid (CSF) of the rat
Haloacetonitriles: metabolism, genotoxicity, and tumor-initiating activity.
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Haloacetonitriles (HAN) are drinking water contaminants produced during chlorine disinfection. This paper evaluates metabolism, genotoxicity, and tumor-initiating activity of these chemicals. The alkylating potential of the HAN to react with the electrophile-trapping agent,
[Histochemical demonstration of glial enzyme activity. II. Reagent and neoplastic glia].
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Enzyme activity changes in reagent and neoplastic glia are examined. In the case of reagent glia, considerably increased ADPase, ATPase and AMPase values have been observed in experimental elective parenchymal necrosis in the rat, in hypertrophic astrocytes from recent plaques in multiple necrosis,
Further observations on the inhibitory effect of extracellular potassium ions on glycine uptake by mouse ascites-tumour cells.
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1. The initial rate of uptake of glycine by the tumour cells was measured as a function of the Na(+) and K(+) concentrations in the solution in which the cells were suspended. When [Gly] was 1mm or 12mm, the rate in the absence of Na(+) was independent of [K(+)] and about 3% or 10% respectively of
The effects of sodium ions and potassium ions on glycine uptake by mouse ascites-tumour cells in the presence and absence of selected metabolic inhibitors.
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1. The initial rate, v, of glycine uptake by ascites-tumour cells respiring their endogenous nutrient reserves was studied as a function of the respective extracellular concentrations of glycine, Na(+) and K(+). With the extracellular concentration of Na(+)+K(+) constant at 158m-equiv./l. and that
Ionophore-mediated coupling between ion fluxes and amino acid absorption in mouse ascites-tumour cells. Restoration of the physiological gradients of methionine by valinomycin in the absence of adenosine triphosphate.
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1. Preparations of mouse ascites-tumour cells depleted of ATP and Na(+) ions accumulated l-methionine, in the presence of cyanide and deoxyglucose, from a 1mm solution containing 80mequiv. of Na(+)/l and about 5mequiv. of K(+)/l. Valinomycin increased, from about 4 to 16, the maximum value of the
Preferential activation of mitomycin C to cytotoxic metabolites by hypoxic tumor cells.
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Mitomycin C, a bioreductive alkylating agent with clinical utility against several human tumors, was found to be selectively toxic at a relatively low concentration (1.5 micro M) to EMT6 tumor cells made chronically hypoxic by preincubation in 95% N2-5% CO2 for 4 hr prior to drug exposure. This
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