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Biomedical subjects

E Linder

Publications and source records attributed to E Linder.

At least 109 records · Page 6Linked to original sources
PubMed1980

A simple immunofluorescence assay for C1q binding.

Antibody-independent binding of B1q to Crithidia luciliae kinetoplast DNA was demonstrated by immunofluorescence microscopy. The method allows detection of C1q in human sera diluted 1/20--1/40 and in 5--10 micrograms/ml concentrations of isolated C1q. Various substances known to interfere with the early events of complement activation inhibited binding of C1q to kinetoplasts. The method may be used as a functional assay for serum C1q.

Binding Sites, Antibody↗
PubMed1980

Different types of smooth muscle antibodies in chronic active hepatitis and primary biliary cirrhosis: their diagnostic and prognostic significance.

The diagnostic and prognostic significance of the different types of serum smooth muscle antibodies (SMA) were investigated in sera of 24 patients with chronic active hepatitis (CAH) and 15 patients with primary biliary cirrhosis (PBC). SMA of IgG class were found in 92% of sera from patients with CAH but in only 20% of sera from PBC patients, whereas the incidence of IgM-SMA was higher in PBC (67%) than in CAH (38%). All six patients with the atypical cholestatic form of CAH has SMA of IgM class, whereas other CAH patients had SMA of mainly IgG class. SMA reacting with rabbit liver (bile canaliculus antibodies, BCA) and with rat glomeruli (glomerulus antibodies) were of anti-actin specificity and were more common in CAH than in PBC. Organ specific BCA or glomerulus antibodies were not found. Anti-actin antibodies were detected in the majority of the investigated sera by an immunoenzymatic anti-actin assay. The results suggest that the determination of SMA titres with heavy chain specific antisera may help in the assessment of diagnosis and prognosis of chronic hepatitis.

Adult↗
PubMed1980

Fibronectin as a marker for the glomerular mesangium in immunohistology of kidney biopsies.

Antibodies against fibronectin have been used as a marker for the glomerular mesangium in routine immunofluorescence microscopy of renal biopsies. Rhodamine-conjugated antibodies against fibronectin were used in this study of 22 human kidney biopsies and four histologically normal kidneys in combination with routinely employed fluorescein-conjugated antibodies against immunoglobulins, complement components, and fibrin. The distribution of fibronectin was similar to mesangial material demonstrable by silver impregnation. By the double staining procedure localization of deposits in relation to the mesangium was considerably facilitated. Variations in the mesangial fibronectin were observed; staining was increased in seven of 11 cases of mesangial glomerulonephritis, and decreased or absent in four of four cases of membranous glomerulonephritis and three of three cases of amyloidosis. Abnormal localization of fibronectin was observed in glomerular crescents and in the intertubular area together with fibrin in kidney transplants. The results suggest that antibodies against fibronectin are useful markers for the glomerular mesangium and that alterations in mesangial fibronectin may reflect the functi-nal state of the glomerulus. Abnormal localization in extramesangial areas may result from local synthesis or increased adsorption of circulating fibronectin to fibrin or collagen.

Adult↗
PubMed1980

Heymann nephritis induced by kidney brush border glycoproteins.

Heymann nephritis developed in rats immunized with brush border membrane fractions isolated from rat kidney tubules. Glomerular autoantibodies eluted from cryostat sections of nephritic kidneys reacted in immunoelectron microscopy with the outer surface of isolated brush border membrane vesicles. This indicates that the autoantigens are plasma membrane components. To characterize further the chemical nature of the nephritogenic autoantigens, we treated the brush border membranes with trypsin and sodium deoxycholate, and the solubilized membranes were then fractionated by lectin affinity chromatography. The polypeptide composition of the fractions was analyzed by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. The capacity of the membrane fractions to induce Heymann nephritis was assessed by observing the development of typical renal lesions, antibrush border autoantibodies, and proteinuria in rats immunized with these fractions. The results suggest that the nephritogenic autoantigen is an integral component of the brush border membrane of kidney proximal tubules and has an affinity for Lens culinaris agglutinin. This indicates that it is a glycoprotein and has mannosyl and/or glycosyl groups exposed in its oligosaccharide side chains.

Animals↗
PubMed1979

Glial fibrillary acidic protein and intermediate filaments in human glioma cells.

Cultured human glioma cells were studied by double indirect immunofluorescence technique using antisera against intermediate filaments and glial fibrillary acidic protein. With both antisera cytoplasmic fibrillar fluorescence was seen. Perinuclear bundles of intermediate-sized filaments, induced by vinblastine treatment, were strongly stained with both antisera. The degree of codistribution of the two types of antigenic determinants varied considerably from cell to cell. The results suggest that two types of filament-related antigenic determinants can be present in the same cell, and also that glial fibrillary acidic protein-related filaments may possess functional similarities to the intermediate filaments found in other cells. Glial fibrillary acidic protein remains as a useful and specific antigenic marker for the study of glial cells in vitro.

Astrocytoma↗
PubMed1979

Intermediate filaments in hyaline material in alcoholic liver disease (Mallory bodies) and in cultured hepatoma cells.

Antibodies specific for cytoskeletal intermediate (10 nm) filaments reacted both with the hyaline deposits in alcoholic liver disease (Mallory bodies) and with perinuclear hyaline material of cultured hepatoma cells used as a model for hyaline formation in vitro. Our results suggest that disorganization and accumulation of intermediate filaments is an important step in the pathogenesis of alcoholic liver injury.

Animals↗
PubMed1979

[Pseudocysts and retention cysts in acute and chronic pancreatitis (author's transl)].

42 cases of pancreatic cyst in acute (22 cases) pr chronic (20 cases) pancreatitis were seen between 1962 and 1976. Analysis of the case data revealed the following: (1) exact assignment of the cyst to acute or chronic pancreatitis is often possible only by long-term observation; (2) the cysts of chronic pancreatitis are not a uniform group: some (8 cases) apparently occurred in acute pancreatitis through necrotic episodes (pseudocysts), others (12 cases) by a retention mechanism; these "retention cysts" develop later in the course of chronic pancreatitis than the pseudocysts and produce a different clinical picture with better prognosis; (3) barium meal and retrograde cholangiopancreatography proved of diagnostic value' (4) if the cysts persist for more than six weeks operation is indicated because of the high incidence of complications.

Acute Disease↗
PubMed1979

C3b binding immune complexes and immunoconglutinins in human sera. Detection by enzyme-linked immunosorbent assay (ELISA).

An enzyme-linked immunosorbent assay (ELISA) designed to measure autoantibodies against C3b (immunoconglutinins: IK) also detects immune complexes (IC). Solid phase C3b, in addition to binding IK of IgG, IgM and IgA classes, bound aggregated human IgG, IgA and aggregated immunologically purified anti-tetanus toxid antibodies as well as model complexes of tetanus toxoid-human anti-toxoid. Significant C3b binding IgG, IgM and IgA activities were seen in the sera of 20 SLE patients but not in sera from healthy blood donors. Ultracentrifugation analysis of two SLE sera revealed C3b binding IgG and IgA activities in both light (7S) and heavy (greater than or equal to 11S) fractions. This indicates simultaneous presence of IK and IC in these sera. On the basis of the known relationship between IK and IC formation we suggest that the solid phase C3b ELISA may be of value in evaluating immune reactions in patients.

Antigen-Antibody Complex↗
PubMed1979

Amyloid-like green birefringence in cytoskeletal 10 nm filaments after staining with Congo red.

The commonly accepted markers for amyliod are a fibrillar ultrastructure and congophilia combined with green birefringence when viewed under polarized light. Although a number of cells have been implicated in amyloid formation the detailed events leading to accumulation of amyloid are still unknown. Previous studies have suggested that amyloid shares antigenic properties with cytoskeletal intermediate (10 nm) filaments and connective tissue microfibrils. In the present study we show that such filaments present in fibroblasts and lymphoid cells have an affinity for Congo red, exhibit the typical green birefringence and are ultrastructurally indistinguishable from amyloid fibrils. Intermediate filaments of cultured fibroblasts depleted of nutrient medium retained the Congo red birefringent property and typical ultrastructure despite cell damage. Our observations suggest that amyloid deposits may form locally through abnormal accumulation of bundles of cytoskeletal intermediate filaments under conditions characterized by increased cell proliferation and death.

Amyloid↗
PubMed1979

Demonstration of antibodies against Yersinia enterocolitica lipopolysaccharide in human sera by enzyme-linked immunosorbent assay.

Antibodies against Yersinia enterocolitica serotype O:3 lipopolysaccharide present in sera from patients with Yersinia infection were studied by using an enzyme-linked immunosorbent assay. Of the sera with significant bacterial agglutination titers against Y. enterocolitica type O:3, 86% contained anti-lipopolysaccharide antibodies of the immunoglobulin G class. With the sera of some patients, we demonstrated increasing anti-lipopolysaccharide antibody levels of immunoglobulin G class in spite of decreasing bacterial agglutination titers. The assay was specific for lipopolysaccharide from Y. enterocolitica type O:3, and in inhibition experiments lipopolysaccharide could be detected in amounts of greater than or equal to 0.5 micrograms/ml.

Agglutination Tests↗
PubMed1979

A double-blind trial of synthetic salmon calcitonin in the treatment of acute pancreatitis.

A multicenter randomized double-blind trial on the use of synthetic salmon calcitonin (SCT) was carried out in 94 patients with acute pancreatitis. In addition to strict standard treatment--without aprotinin, atropine, or antacids--50 patients received daily 3 x 20 micrograms = 300 MRCU SCT intravenously and 44 patients received placebo for 6 days. Mortality rate was not influenced, overall mortality being 5.3%. The number of patients without pain and with normalized serum amylase on a given day was significantly higher in the group treated with SCT. Other parameters such as doses of analgesics, leukocyte count, and normalization of seven defined clinical and laboratory criteria within 6 days showed a positive trend without reaching significance.

Acute Disease↗