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[Study of the responses of tumor and normal tissues to exposure to ionizing radiation by the EPR method. I. Comparison of the low temperature EPR spectra of irradiated tumor and normal tissues].

ESR spectra of liver samples of normal mice and liver tumour samples of mice (line C3HA) injected hepatomo 22-a irradiated in the dose of 1 Mrad at --196 degrees C were studied. The ESR spectra of normal and tumour tissues irradiated at --196 degrees C are shown to differ. Only the ESR spectra of tumour and liver of the tumour host is characterized by an asymmetric signal with deltaH=6 Oe and g=2.0005 ("tumour" signal). The intensity of the "tumour" signal depends on the developmental stage of hepatoma. It is changed after the animals are injected with ionol.

Animals↗
PubMed1979

[Effect of radioprotectors on cAMP-dependent protein phosphorylation].

The capacity of radioprotectors (serotonin, aminoethylisothiuronium) to stimulate in radioprotective doses cAMP-dependent protein phosphorylation of the cytozol and nuclei of the mouse liver and of the spleen cytozol was shown in vivo. Radioprotectors were incapable of modulating in vitro the activity of protein kinases and the stimulating effect of cAMP. The data presented and previous investigations suggest that the activation of cAMP-dependent phosphorylation by radioprotectors was due to the increase of intracellular cAMP concentration under the effect of radioprotectors.

Animals↗
PubMed1979

[General characteristics and comparative evaluation of the radioprotective properties of aryl alkyl amine adrenomimetics in experiments on mice].

The radioprotective effect (RPE) of some arylalkylamines (AAAs) was studied in experiments on mice. Mesaton and its close analogues were injected subcutaneously 15 minutes prior to irradiation at a dose of 800 rad. The protective effect is exerted by AAAs in low doses (25--50 mumole/kg), the compounds show stable and high RPE (80--80% survival, dose reduction factor being 1.3--1.4) and low toxicity (LD50 = 4--8 mumole/kg). AAAs studied are not less effective than aminothiols. Their pharmacological spectrum--K = LD50/ED50 (200--500) is superior to that of known aminothiols and indolylalkylamines.

Animals↗
PubMed1975

Studies on the effect of Fenchlorphos on postirradiation changes of serum proteins and nucleic acids content in rat liver.

The effect of Fenchlorphos on postirradiation changes of serum protein levels and nucleic acid content in rat liver were investigated. It was found that this compound significantly decreases postirradiation changes in serum proteins, properdin level and nucleic acid content in rat liver. An important role of these phenomena in radioprotective action of Fenchlorphos is suggested.

Alpha-Globulins↗
PubMed1975

Cytogenetics analysis of meiotic chromosomes of irradiated mice and their progeny after treatment with streptomycin and dihydrodeoxystreptomycin.

The purpose of this investigation is to find out whether streptomycin and the related compound dihydrodeoxystreptomycin have any mutagenic effect and whether they both are capable of recovering X-ray induced chromosomal translocations in mouse spermatogonia of directly treated animals and their progeny of the first generation. The cytological findings show the absence of any mutagenic effect in animals nonirradiated and treated with streptomycin and dihydrodeoxystreptomycin. The frequency of chromosomal translocation after total irradiation was 9,07%; in animals treated with streptomycin following irradiation 5.13%, and in those irradiated and treated with dihyrodeoxystreptomycin, 3.70%. Male offsprings, originated from parents treated only with antibiotics show no chromosomal translocations. However, offsprings originated from irradiated and treated parents gave birth to the male offspring with chromosomal translocations.

Animals↗
PubMed1976

Amperometric and polarographic study of the SH-activity of MEPRIN (alpha-mercapto-propionylglycine).

The SH-groups of alpha-mercapto-propionylglycine (MEPRIN) are remarkably stable in diluted solution either at room temperature or at 50 degrees C, even if storing takes place under air-bubbling. The SH-activity was measured by polarographic method and amperometric titration. Neutralization of the carboxyl group decreases the stability of the sulfhydryl groupings. Evaporation of neutralized solution leads to a 30--50 per cent decrease of SH-activity. Lyophilization reduces this loss by 10--15 per cent. Neutralization is best carried out in the absence of oxygen; in this case, 94 per cent of the sulfhydryl activity will persists, irrespective of the pH. The dissociation constant of MEPRIN-SH is pK' = 8.47. The SH-stability of the product is satisfactory when neutralized in nitrogen atmosphere to pH 3--5; a loss of only 5 per cent can be expected after storing in an oxygen-free 10(-3) molar solution for 144 hours. Between pH 6 and 8 this value is 31 per cent on the average, while at pH 9 it is more favorable again.

Amino Acids, Sulfur↗