Publications by authors named "Ignatenko L"

The effect of water-soluble sorbents on exocrine function of the liver was studied in chronic experiments on 2 dogs with a brought out bile duct. It is shown that choline and digitonin sorbents exhibit choleretic properties similar to those of cholestyramine. Choline sorbent causes a drop in the concentration of (2-4-fold) cholic acid in the bile unlike digitonin sorbent.

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The use of a modified, adequate method of quantification of estrogen receptors has permitted us to prove the existence of sex-specific peculiarities in rat liver estrogen reception and their significance for the realization of sex-dependent changes in angiotensinogen plasma level after estrogenization. Endocrine mechanisms for the formation of sex-related differences in hepatic estrogen receptor content in rats were investigated in detail. The investigation shows that androgens have negative regulatory influence on the hepatic estrogen receptor level in rats.

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A study was made of the endocrine mechanisms of the formation and maintenance of a sex-differentiated level of estrogen receptors (ER) in rat liver cytosol. The administration of testosterone-propionate (TP) at a dose of 3 mg for 3 days was shown to cause a significant decrease in the concentration of ER in the liver of gonadectomized animals to the level in intact male rats. In a week after the discontinuation of TP, a complete restoration of the basal level of receptors was observed.

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The significance of sex differences in the level of estrogen receptors (ER) in hepatocytes for direct effects of estrogens in male and female rat livers was investigated. 4-5-fold increase in ER level and 20-30%-elevation in plasma angiotensinogen (AG) occurred after a single injection of 0.5 microgram of hexestrol (HE) in female and gonadectomized male rats.

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The level of estrogen receptors (ER) in the cytosol and nuclear subfractions of female rat hepatocytes was studied 1 h and plasma angiotensinogen (AG) concentration 24 h after single and multiple administration of different doses of estradiol (E2) and synthetic estrogens. Synthetic weakly metabolized estrogens, used at doses corresponding to physiological concentrations of the natural female sex steroid, were shown to be much more effective than E2 in relation to ER redistribution between the cytosol and nuclear fractions of hepatocytes as well as in relation to the stimulation of AG production by the liver. Differences in the ER level in hepatocytic nuclei 1 h after single or multiple administration of the same estrogen were undetectable.

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The procedure designed for the estimation of estrogen receptors (ER) in rat liver cytosol using sodium thiocyanate was shown to be useful for differential quantification of the ER level in liver cytosol of male rats, containing the unusual estrogen-binding protein. The ER concentration in rat liver cytosol was shown to be a sex dependent feature: its content in male rats (55 +/- 4 fmol/mg of protein) was lower (p 0.001) than that in female rats (116 +/- 4 fmol/mg of protein).

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Experiments on dogs with Pavlov isolated pouches and gastric fistulas have shown that the ingested solution of MSG produces a potentiating effect on maximal gastric secretion caused by pentagastrin. This effect is apparently connected with the formation of glutathione in intestine. The glutathione concentration in blood after the intake of MSG is significantly elevated.

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The regularities of the time course and intracellular distribution of estrogen receptors (ER) of the liver of ovariectomized female rats after a single injection of 1, 25 and 500 micrograms of E2 were investigated using new variants of a method of ligand exchange. The ER content in liver cells was 12275 +/- 1100 (n = 33) bonds per cell (by one order lower than in the uterus). A single injection of E2 at a dose of 1 micrograms caused no changes in the ER content in the liver cytosol and nuclear fractions whereas reciprocal redistribution of ER between the cytosol and nuclei was noted in the uterus.

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A procedure is described for estimation of free and bound estrogen receptors in rat liver cytosol at low temperature using ligand turnover in presence of sodium thiocyanate. Total content of estrogen receptors was similar in cytosol of intact and ovariectomized rat females but about 30% of estrogen receptors were estimated in cytosol of intact animals as estrogen-receptor complexes. Within 24 hrs after single administration of 500 mg estradiol E2 into ovariectomized rat females approximately 50% of estrogen receptors were shown to be bound with hormone in cytosol.

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In experiments on dogs with Pavlov's pouches it was shown that glutathione infusion into the blood produced a highly pronounced stimulating effect on the gastric secretion induced by pentagastrin. Endogenous glutathione produced similar effect. It was found that intake as a drink of mono-sodium glutamate led to a significant increase of glutathione concentration in the dogs' blood, that was, probably, the result of its intensified production in the intestinal wall and passing into the blood.

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The effect of dicarboxylic amino acids and their amides on gastric secretion stimulated by sham-feeding (100 g of raw meat), as well as of amides of dicarboxylic amino acids on the gastric secretory function was studied in 119 tests on 8 dogs with gastric fistulas according to Basov. The tests were started 16-18 h after feeding under neutral or alkaline reactions of gastric excretion. The tests demonstrated that dicarboxylic amino acids inhibited gastric secretion induced by sham-feeding.

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The experiments on dogs using gastrin inhibitors (Milid, secretin) and the data of radioimmunoassay on gastrin blood levels have shown that gastrin is not involved into the activation of gastric glands after parenteral injection of amino acids.

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The catecholamine and adrenocortical systems in 52 patients with depression were studied with regard to the degree of their emotional tension. On the basis of the clinical characteristics of the depressive syndrome the patients were divided into two groups: the stressory hyperergic type (Group 1) and the torpid hypoergic type (Group 2). Some characteristics of the studied systems proved common for both groups: they increased secretion of 11-hydroxycorticosteroids and impairment of the mechanisms of negative feedback in the regulation of adrenocortical activity, as well as a decrease in the excretion of dopamine, adrenaline, and DOPA in the presence of a relative acceleration of catecholamine inactivation.

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The level of nonmetabolized forms of the corticosteroids hydrocortisone and corticosterone in the blood and urine were determined in 3 groups of patients: with the Icenko-Cushing disease and syndrome and neuroendocrine form of the hypothalamic syndrome. The determination of the level of these hormones, a study of their circadian rhythm by the method of concurrent protein binding have shown that these indices are rather informative and can be recommended as diagnostic and differential criteria for the evaluation of the hypothalamo-hypophyseal-adrenal system.

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Experiments on dogs with Basov's gastric fistulas were made to study the effect of amino acids with branched carbon chains (L-isoleucine, L-leucine, L-valine) on gastric secretion. The mixture of amino acids in a concentration of 0.16 M exerts a powerful enough stimulant action, provoking gastric secretion amounting to 2/3 of the value obtained during sham meat feeding.

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