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Biomedical subjects

N Cremer

Publications and source records attributed to N Cremer.

At least 19 recordsLinked to original sources
PubMed1982

Monoclonal antibodies to human cytomegalovirus: three surface membrane proteins with unique immunological and electrophoretic properties specify cross-reactive determinants.

Seventy-seven clones of hybridomas selected for reactivity by immunofluorescence with human cytomegalovirus (CMV)-infected cells were produced by fusing mouse myeloma cells with the spleen cells of mice immunized with CMV strain AD169. The clones were classified into seven groups on the basis of the electrophoretic properties of the polypeptides immune precipitated from extracts of CMV-infected cells. Studies on the three groups of monoclonal antibodies directed against CMV surface membrane antigens showed the following. Clones in each group were differentiated by immunoglobulin subclass, neutralizing activity, and reactivity with the antigenic domains of proteins exposed on the surface membranes of intact CMV-infected cells. Monoclonal antibodies in each group precipitated one slowly migrating protein and multiple faster migrating forms which shared antigenic determinants. The first group of monoclonal antibodies precipitated four glycosylated polypeptides with apparent molecular weights of 130,000, 110,000, 100,000, and 60,000. Monoclonal antibody CH51 of this group neutralized infectious virus but failed to react with antigenic domains on the surfaces of infected cells. The second group of monoclonal antibodies precipitated four polypeptides with apparent molecular weights of approximately 66,000, 55,000, 50,000, and 46,000. Monoclonal antibodies CH65 and CH134 in this group had neutralizing activity and reacted with antigenic domains of proteins exposed on the surface of CMV-infected cells. The third group of monoclonal antibodies precipitated four polypeptides with apparent molecular weights of 49,000, 48,000, 34,000, and 25,000. Serological analysis of 15 naturally occurring CMV strains with a panel of monoclonal antibodies to surface membrane proteins showed that the antigenic determinants reactive with the antibodies tested were conserved in all of the strains. Monoclonal antibodies to surface membrane proteins on CMV-infected cells may prove to be valuable reagents for identification of virus isolates.

Antibodies, Monoclonal↗
PubMed1982

Electrophoretic analysis of polypeptides immune precipitated from cytomegalovirus-infected cell extracts by human sera.

Serodiagnosis of cytomegalovirus (CMV) infection by complement fixation tests depends on showing a fourfold rise in antibody titer from acute- to convalescent-phase sera. Freeze-thaw and glycine-extracted, infected cell culture antigens used for these tests give markedly different titers in reactions with the same sera. In this study, we characterized the CMV-infected cell polypeptides contained in freeze-thaw and glycine-extracted antigens and identified the proteins precipitated by 23 pairs of human acute and convalescent sera. Our results were as follows. First, freeze-thaw and glycine-extracted antigens prepared from infected cells radiolabeled with [35S]methionine and subjected to electrophoresis in sodium dodecyl sulfate-polyacrylamide gels yielded similar patterns, and the bulk of the label was contained in late structural proteins and glycoproteins. Glycine-extracted preparations contained a greater proportion of soluble 66,000- and 50,000-molecular-weight proteins than did freeze-thaw antigens. Second, convalescent sera precipitated proteins migrating with apparent molecular weights of 150,000, 130,000, 110,000, 96,000, 74,000, 66,000, 50,000, 34,000, 32,000, and 25,000. Of these the 130,000-, 110,000-, 96,000-, 66,000-, 50,000-, and 25,000-molecular-weight proteins comigrated with glucosamine-labeled polypeptides. Both immunoglobulin G and M antibodies in human sera precipitated these proteins from CMV-infected cell preparations. Implications of the results for serodiagnosis of CMV infections are discussed.

Antibodies, Viral↗
PubMed1980

Generalized fatal chronic infection by Mycobacterium scrofulaceum with severe amyloidosis in a child.

The case history and autopsy of a young boy chronically infected with M. scrofulaceum is reported. The pathology of the lesions, which affected mainly the skin and the bones, was that of a nonspecific inflammatory reaction, with many acid-fast bacteria. Some improvement was obtained by these use of several antimycobacterial drugs, but the general condition deteriorated, the child dying at the age of 16 after more than five years of sickness. One of the causes of death was a severe generalized amyloidosis. This case is discussed in relation with the very small number of autopsies of patients dying of infection caused by scotochromogenic mycobacteria, or M. scrofulaceum. A possible immunological defect cannot be entirely ruled out.

Adolescent↗
PubMed1978

Farber's disease as a ceramidosis: clinical, radiological and biochemical aspects.

A case of Farber's disease associated with athyreosis is reported in a Belgian infant born from consanguineous parents. A detailed clinical observation made from the early onset of symptoms until death of the patient at age of 22 months, together with radiological, morphological and biochemical data confirmed the diagnosis of Farber's disease and its specific storage process. Cultured fibroblast studies disclosed an abnormal catabolism of ceramides, presumably related to the deficiency in lysosomal ceramidase. Family history confirms that the disease is inherited as an autosomal recessive trait.

Ceramides↗
PubMed1977

Fiberendoscopic monitorised dilatation of oesophageal strictures in children.

Oesophageal dilatations were performed 55 times in 10 children aged 2 months to 8 years presenting with acquired strictures of several origins. Classical bougienage with rubber material and newer technique with the Eder-Puestow's metallic olives system were used successively. The conjunction of the latter with systematic use of fiberendoscopy enhances considerably the safety of the procedure and permits better functional results.

Child↗
PubMed1977

Intramural hematoma of the alimentary tract in two hemophilic children.

The occurrence of an intramural hematoma of the alimentary tract is reported in two hemophilic children. In both cases, the hematomas may be the result of a mild unrecognized trauma. The first patient presents large duodenal hematomas with secondary rupture into the retroperitoneal space. Death occurs despite medical and surgical treatment. The second patient presents an intramural hematoma of the colon, which is treated medically. In both cases factor VIII inhibitors developed during the course of therapy. Indications for medical or surgical treatment are discussed.

Barium Sulfate↗