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Biomedical subjects

B Astedt

Publications and source records attributed to B Astedt.

At least 163 records · Page 9Linked to original sources
PubMed1976

Purification of urokinase by affinity chromatography.

Commercially available urokinase (EC 3.4.99.26), though highly active, is still contaminated with unrelated proteins and degradation fragments of urokinase. Further purification of a urokinase preparation by chromatography on benzamidine-Sepharose is described. The final preparation consisted of two molecular forms of urokinase with molecular weights of respectively 31 000 and 54 000. The 54 000-dalton urokinase appears to be composed of two protein chains, one of which is the 31 000-dalton urokinase. A monospecific antiserum against urokinase was raised.

Benzamidines↗
PubMed1976

Intrauterine device increases the fibrinolytic activity of the rat endometrium at deciduation, a new aspect of its contraceptive effect.

The fibrinolytic activity of the endometrium of the two uterine horns in the rat was histochemically determined. One of the horns contained a plastic-IUD, the other served as control. The endometrium of the control horn was almost inactive in contrast with that of the IUD-horn in which fibrinolytic activity was apparent. The fibrinolytic activity induced by the IUD might be involved in the prevention of ova implantation.

Animals↗
PubMed1976

Perforation of the uterus by copper-IUDs.

In about 5 000 copper-IUD insertions 5 cases of perforation were found. One woman had 2 devices inserted, both of them perforated. Copper-T was responsible for 3 corporal perforations and copper-7 for 2 corporal and 1 cervical perforation.

Adult↗
PubMed1976

On radiation-decreased fibrinolytic activity of vessel walls.

Fibrinolytic activity was histochemically determined in biopsy specimens of the walls of human veins (vv. epigastricae superficiales) obtained from 15 patients after irradiation of the lower abdomen because of malignant genital diseases and compared with non-irradiated controls. The activity was significantly lower (p less than 0.001) after radiotherapy.

Female↗
PubMed1976

Inhibitory effect of decidua on fibrinolysis induced by urokinase and by the fibrinolytic activity of the rat ovum.

With the use of a technique, which permits the study of fibrinolytic enzymes and inhibitors in organ culture, human decidua was found to produce inhibitors capable of inhibiting plasminogen activation induced by urokinase as well as activators released from kidney explants. Also the medium in which rat and human decidua had been cultured was found to inhibit fibrinolytic activity of the rat ovum. The inhibitors emanating from the decidua are presumably of importance for facilatating the implantation of ova.

Animals↗
PubMed1976

Changes in amniotic fluid phospholipids on treatment with glucocorticoids to prevent respiratory distress syndrome.

Amniotic fluid was obtained by transabdominal amniocentesis in 51 women in the 29th-36th week of pregnancy. The lecithin/sphingomyelin ratio was determined. In 28 patients,the ratio was less than 2.2. Beta-methasone was given for three days to 14 of them; the rest served as controls. On the fourth day, a second amniocentesis was performed on all patients. The lecithin/sphingomyelin ratio rose to a value greater than 2.2 in 4 of the patients in the betamethasone-treated group and in one of the controls. The percentage of palmitic acid in the lecithin increased concomitantly with increasing lecithin/sphingomyelin ratio. These results suggest that glucocorticoid induced acceleration of fetal pulmonary maturation may be reflected in the amniotic fluid as changes in its phospholipid composition. The lecithin/sphingomyelin ratio was found to be greater than 2.2 in 23 patients at the first amniocentesis. In such cases treatment with glucocorticoids can be avoided.

Amniotic Fluid↗
PubMed1976

Release of fibrinolytic activators from human ovarian tumours in organ culture.

Malignant human ovarian tumours possess coagulative and fibrinolytic properties, reflected in the occurrence of fibrin/fibrinogen degradation products (FDP) in the serum or ascitic fluid. The degradation of fibrin/fibrinogen into FDP is initiated by activators of fibrinolysis. Using a culture method permitting continuous measurement of fibrinolytic activators released, we investigated this release in organ culture of 27 various human ovarian tumours and 7 normal ovaries. The results showed that ovarian tumour explants released more fibrinolytic enzymes than explants from normal ovaries.

Female↗
PubMed1976

Effect of cortisone and acth on the phospholipids of human amniotic fluid and lung tissue in early gestation.

Fifteen physically healthy women who received permission for legal abortion on sociomedical grounds in the second trimester of pregnancy were given either cortisone acetate per os or adrenocorticotrophic hormone (ACTH) intramuscularyly for 3 days previous to hysterotomy. Eight other patients served as controls. The phospholipid composition of amniotic fluid, fetal lung washings, and lung tissue was analyzed. In the cortisone group there was a significant increase in the proportion of palmitic acid in the lung tissue lecithins linked to a corresponding decrease in the oleic acid. A similar tendency was observed in the ACTH group, but the changes were not significant. The investigation suggests that the human fetal lung already at this early stage of development is capable of responding to the action of cortisone by a relative increase in the synthesis of dipalmitoyllecithin.

Adrenocorticotropic Hormone↗
PubMed1975

Effect of cortisol on human fetal lung in organ culture: a biochemical, electron-microscopic and autoradiographic study.

Human fetal lung tissue obtained during the second trimester was cultured as organ culture with or without cortisol. The effect of cortisol on the phospholipid metabolism, as related to the appearance of osmiophilic lamellar bodies and the localisation of newly incorporated choline, was studied. In cortisol-treated explants, the concentration of saturated lecithins and the incorporation of (Me-3H)-choline into saturated lecithins increases significantly concomitantly with an increased number of osmiophilic lamellar bodies. The labelled choline is predominantly associated with these bodies. The obtained results indicate that cortisol accelerates the synthesis of pulmonary surfactant in the human fetal lung as early as in the second trimester.

Body Height↗