PubMed Health⌕ Search

Biomedical subjects

S Krantz

Publications and source records attributed to S Krantz.

At least 55 records · Page 3Linked to original sources
PubMed1987

Properties of in vitro nonenzymatically glycated plasma fibrinogens.

Nonenzymatic glycation of fibrinogen is species independent and depends only on the glucose concentration in the incubation mixture under selected in vitro conditions. An increased fibrin monomer aggregation in the presence of Ca2+ ions and a decreased proteolytic susceptibility of nonenzymatically glycated fibrinogens may favour the development of thrombophilic states. Blocking of lysine residues as well as restricted conformational changes induced by glucose attachment may be responsible for these effects. Fibrin stabilization by factor XIII is not impaired by nonenzymatic glycation of fibrinogen. Attachment of aortic endothelial cells to fibrin films from glycated fibrinogens is diminished. This phenomenon may be the result of blocked plasminogen activator binding sites in fibrin by nonenzymatic glycation. These effects may contribute in vivo to the accumulation of fibrin in those tissues most frequently affected by diabetic complications.

Animals↗
PubMed1986

The nonenzymatic glycation of proteins and nucleic acids, their importance for the development of diabetic complications, possible molecular basis of aging and autoimmunological processes.

The formation of nonenzymatic glycation products of proteins and nucleic acids appears to be a link between chronic hyperglycaemia and long-term diabetic complications and special forms of aging during normoglycaemia. The major effects of extended glycation include cross-linking of glycated proteins, attachment of soluble proteins to extracellular glycated matrices, conformational changes of proteins followed by altered functions and immunogenicity, and abnormalities in nucleic acid functions.

Aging↗
PubMed1985

[Plasma fibrinogen in female patients with genital cancer and its early stage].

Changes of plasma fibrinogen derivates in 54 female patients suffering from carcinomas of the genital system (36 with cervix carcinoma, 9 with ovarian carcinomas, 7 with carcinomas of the corpus uteri, 1 woman with a vulva and 1 patient with vaginal carcinoma) and 6 females with cervical intraepithelial neoplasia were investigated. It was shown, that the fibrinogen content and the concentration of soluble fibrin monomer complexes in blood plasma depend on the extension of the clinically diagnosed tumor. Furthermore, differently degraded fibrinogens were demonstrated to exist in the blood circulation. The extent of fibrinogenolysis did not correlate with the clinically diagnosed tumor stage.

Adenocarcinoma↗
PubMed1985

[Proteolytic changes in plasma fibrinogen from ovarian venous blood in patients with cervix cancer].

From 9 female patients suffering from carcinoma cervicis (8 women with a stage Ib, 1 woman with a stage IIa carcinoma) blood was taken immediately from the ovarian veins and a cubital vein after laparotomy on the occasion of a surgical intervention according to Wertheim-Held. Fibrinogen was isolated from plasmas by affinity chromatography at fibrin monomer Sepharose and characterized by SDS-PAGE. With one exception proteolytically changed fibrinogens could be demonstrated in all plasmas. In 7 cases the fibrinogens from ovarian blood were more degraded than fibrinogen derivates in the blood obtained from cubital veins. It is assumed that the proteinase and/or plasminogen activator activities of tumor tissues are of importance for the observed proteolytic effects.

Adenocarcinoma↗
PubMed1984

[Changes in the cholinesterase activity and glucose concentration in the blood induced by paraoxon in rabbits immunized against paraoxon].

The immunization of rabbits with a paraoxon-HSA-conjugate resulted in an antibody response with titres of 1:25000 to 1:100000 of antisera dilution and average affinity constants K0 of 10(6) M-1 and heterogeneity indices of 0.8 to 0.9 calculated by means of the Sips equation. The serum cholinesterases and the erythrocyte acetylcholinesterase in immunized rabbits were protected against a stronger inhibition by parenteral application of paraoxon. An increase of blood glucose after paraoxon application to immunized rabbits could not be observed but was detectable in unimmunized animals.

Acetylcholinesterase↗
PubMed1983

[Alpha 1-globulin levels in patients with cancer of the genital tract].

Electrophoretical investigations of plasma protein patterns in 59 patients suffering from carcinomas of the genital system provide some evidence, that the alpha 1-globulin fraction amounts to only 2% in 25% and less than 2% of total plasma protein in 19% of the examined persons. The normal range of alpha 1-globulin is 2 to 4%. Low alpha 1-globulin values are mainly the result of a diminished alpha 1-antitrypsin level.

Alpha-Globulins↗
PubMed1982

[Isolation of an alpha-globulin from rabbit serum responsible for a cobalt(II) ion-induced change in conformation of fibrinogen].

A change in conformation of fibrinogen, caused by cobaltous ions after parenteral application or incubation of plasma, is dependent on the presence of species specific plasma proteins. These proteins, which can be found only in some animals, have not yet been identified. An glycoprotein, responsible for the cobalt effect, was isolated from rabbit serum. It migrates immunoelectrophoretically as an alpha-globulin. In the SDS electrophoresis it was shown to migrate in front of albumin. The actions of this protein, induced by cobaltous ions, could be inhibited by complexing and SH groups alkylating compounds.

Alpha-Globulins↗
PubMed1982

[Production and characterization of antisera against O,O-diethyl-O-(p-nitrophenyl)-phosphate (paraoxon)].

Methods for the production of antibodies against Paraoxon in rabbits are described. The highest-titre antisera were produced with conjugates containing a succinyl spacer group with a degree of derivatisation between 8 and 12 haptens per albumin molecule. The antibody response was tested by immunoprecipitation in agar gel with a hapten-rabbit-albumin-complex and by a radioimmunoassay. The synthesis of 125I labelled tracers is reported. The most potent antisera bound 50% of the radioactive tracer after 1:10(5) dilution and showed apparent affinity constants of 10(6) to 10(7) M-1 for Paraoxon. Compared to Paraoxon these antisera possessed cross reactivities with Parathion of 8.8 to 13.8%, with Methylparathion of 0.35 to 0.82%, and with Dimethoat of 0.0006 to 0.0012%.

Animals↗
PubMed1980

[Qualitative changes in plasma fibrinogen in irradiated rabbits].

Plasma fibrinogens of sublethally irradiated rabbits (8 Gy X-ray irradiation) were isolated by affinity chromatography on fibrin monomer Sepharose and characterised by polyacrylamide gel electrophoresis with sodium dodecylsulfate before and after reduction with 2-mercaptoethanol. Only a small increase of fibrinogen degradation was mainly observed in early phases after irradiation. Fibrin monomer complexes were precipitated together with fibrinogen by 2,5 mol beta-alanine/l. The content of monomer complexes in the precipitate was estimated using Sepharose 6B gel chromatography. Evidence for an increased formation of monomers in the blood could not be obtained. Therefore, proteolytic changes of fibrinogen do not play a role for inducing a hemorrhagic disorder after sublethal X-ray irradiation in rabbits.

Animals↗
PubMed1980

Anemia due to bone marrow failure: diagnosis and treatment.

In the last decade a large increase of our basic understanding concerning erythropoietin and the regulation of erythropoiesis has led to improved methods for the cell culture of human bone marrow cells. These culture methods in turn have been applied to bone marrow failures with a remarkable increase in our knowledge of the pathogenesis of some of these conditions, particularly the aplasias. The pathogenesis of pure red cell aplasia has been elucidated, and 60% of these patients have been shown to respond to cytotoxic, immunosuppressive treatment. Bone marrow transplantation has proved to be very helpful in the treatment of aplastic anemia and has provided impetus for increased knowledge concerning the pathogenesis of the aplasia. Some of these patients may have suppression of marrow hematopoiesis by the marrow T-cells and can be successfully treated with antilymphocyte globulin or high-dose prednisolone. The future looks bright for further clinical advances concerning the bone marrow failures, but more must be learned about the pathogenesis of these anemias if improved methods of treatment are to be developed.

Aged↗
PubMed1979

An exchange of membrane filter samples of airborne asbestos between one United Kingdom and three Scandinavian laboratories.

An asbestos fiber counting trial based on the postal exchange of mounted and unmounted membrane filter samples was conducted between laboratories in Denmark, Norway, Sweden and the United Kingdom. The exchange was organized on the same basis as a previous international exchange involving nine countries (5); the United Kingdom laboratory had also participated in the previous exchange. Differences in counting techniques were distinguished from those due to the method used to make the filter transparent. Counting techniques gave rise to the biggest differences, giving a ratio of highest to lowest count of 2.75 for amphibole and 3.2 for chrysotile asbestos slides. A comparison was also made with the results of the previous international trial; it was made possible by the recounting of some of the slides from this exchange. Serious deterioration over two years was found in all slides except those mounted with the acetone/triacetin method.

Air Pollutants↗
PubMed1978

Anatomical substages of stage III Hodgkin's disease: implications for staging, therapy, and experimental design.

Twenty-three patients with pathologic stage III Hodgkin's disease were classified with respect to the presence or absence of symptoms (III-A, III-B), the presence or absence of splenic involvement (IIIS+, IIIS-) and anatomic substage--the extent of disease within the abdomen (III1, III2). Stage III1 disease included disease limited to the upper abdomen, i.e., spleen, splenic node, celiac node, and/or portal node. All other more extensive disease was classified as stage III2. Symptoms and splenic involvement did not predict either disease-free survival or survival. However, 5 year actuarial disease-free survival was significantly better in III1 patients as compared to III2 patients (77% vs. 13%, p less than .001). Eight of nine stage III2 patients receiving total nodal radiotherapy alone relapsed. When considered along the previous studies of anatomic substage, these findings suggest that patients in stage III1 and III2 should receive different therapeutic approaches. Analysis of therapeutic results in stage III patients must consider anatomic substage.

Abdomen↗