PubMed Health⌕ Search

Biomedical subjects

I Mattsby-Baltzer

Publications and source records attributed to I Mattsby-Baltzer.

46 records · Page 3Linked to original sources
PubMed1982

Experimental Escherichia coli ascending pyelonephritis in rats: changes in bacterial properties and the immune response to surface antigens.

Systemic and urinary antibody responses were examined in rats with experimental ascending pyelonephritis caused by Escherichia coli O6K13H1. During 12-month follow-up of the infections, bacterial characteristics of the urinary and renal isolates were followed: O and K antigenicity, sensitivity to the bactericidal effect of normal human serum, capacity to attach to urinary tract epithelial cells, hemolytic activity, biochemical pattern, and virulence. During the long-term infection, the urinary and renal bacterial isolates changed in O and K antigenicity, serum sensitivity, and virulence. The adhesive capacity of the bacterial isolates did not change, possibly explaining the persistence of the bacteria in the urinary tract. The serum anti-O6 antibody levels remained high during the entire 1-year observation period, especially in the rats with renal involvement. Urinary anti-O6 antibodies were also found. The serum and urinary antibodies could have played a role in bringing about the observed changes in bacterial characteristics. Antibodies to lipid A were recorded in 9 of 16 rats with pyelonephritis and renal scarring and in 1 of 9 rats not having pyelonephritis or renal bacterial growth.

Adhesiveness↗
PubMed1982

Experimental Escherichia coli ascending pyelonephritis in rats: active peroral immunization with live Escherichia coli.

Peroral immunization with a live strain of Escherichia coli O6K13H1 against experimental ascending pyelonephritis caused by the same strain was studied in rats, and the effect of immunization on antibody titers against the O and K antigens and lipid A was determined. Peroral immunization with live bacteria protected significantly against pyelonephritis. Sera collected 1 week after infection from the immunized group were increased in immunoglobulin G (IgG) anti-O6 and IgM anti-K13 in comparison with the nonimmunized group. The peroral immunization did not correspondingly affect the response to lipid A. In urine, there was an IgG antibody response to the O6 antigen. In bronchopulmonary secretion, IgM, IgG, and IgA antibodies to O6 were detected. Perorally immunized animals had significantly higher levels of IgG and IgA anti-O6 compared with the nonimmunized group 1 week after infection. Passive transfer of anti-lipid A did not increase resistance against pyelonephritis.

Animals↗
PubMed1981

Antibodies to lipid A during urinary tract infection.

Serum levels of antibodies to lipid A were determined with an enzyme-linked immunosorbent assay in 26 girls with their first known symptomatic urinary tract infection (UTI) and in 15 girls with asymptomatic bacteriuria (ABU). Also included were six female patients with recurrence of acute upper UTI, five of whom had renal changes after the infections; 28 female patients with renal scarring but not symptomatic UTI at the time of investigation; and uninfected individuals. IgG and IgM antibodies to lipid A were found in approximately 50% of the uninfected children older than two years of age. Girls with acute cystitis, acute pyelonephritis, or ABU showed significantly elevated levels of IgG antibodies to lipid A as compared with children with no history of UTI. High levels of IgG antibodies to lipid A may be indicative of severe renal infection and development or progression of renal parenchymal reduction. The diagnostic value of determining levels of antibodies to lipid A is discussed.

Adolescent↗
PubMed1979

Lipid A and anti-lipid A.

Lipid A in free form, in crude antigen preparations, and on Formalin-treated Escherichia coli and Salmonella minnesota R595 was employed in studies of its antigenic composition, immunogenicity, and availability on gram-negative bacteria. Analyses with immunodiffusion and crossed immunoelectrophoresis of isolated lipid A preparations revealed three components. Inhibition experiments with enzyme-linked immunosorbent assay showed that the lipid A structure was not exposed on the tested smooth or rough E. coli strains or on S. minnesota R595. In crude O antigen preparations from some of the strains, however, lipid A was available for reaction with antibodies. The inaccessibility of lipid A on the bacterial surface may explain the poor protective capacity of anti-lipid A antibodies against bacterial infections. An enzyme-linked immunosorbent assay was more sensitive for measuring anti-lipid A antibody activity than indirect hemolysis or indirect hemagglutination. With an enzyme-linked immunosorbent assay it was shown that in rabbits the immunogenicity of lipid A was approximately the same when coated on erythrocytes or, as is more commonly done, when lipid A-coated hydrolyzed bacteria were used. Some antisera from rabbits immunized with E. coli of different serotypes showed activity against lipid A, with a higher frequency for antisera from rabbits immunized with R mutants.

Antibodies, Bacterial↗
PubMed1979

Immunological aspects of pyelonephritis.

Several virulence factors, such as O and K antigens and capacity to attach to uroepithelial cells, seem to be required for Escheria coli to cause acute pyelonephritis. These factors induce an immune response, however, which can modify the course and clinical expression of the infection. During acute pyelonephritis, autoantibodies to the Tamm-Horsfall protein increase. These antibodies, which probably are evoked by a cross-reaction noted between structures of E. coli LPS and the Tamm-Horsfall protein, may add to the renal tissue engagement in interstitial nephritis caused by bacterial pyelonephritis.

Acute Disease↗
PubMed1978

Neutrophil granulocyte function in pustulosis palmoplantaris.

The phagocytic bactericidal capacity of circulating neutrophilic granulocytes was estimated in 22 patients with pustulosis palmoplantaris (PPP). The control group comprised 100 healthy individuals. Leukocytes from the patients had a statistically significant reduced capacity to kill Staph. aureus in autologous as well as in AB serum. Leukocyte killing of E. coli was not reduced. Serum levels of total hemolytic complement, C3, C4 and neutrophil myeloperoxidase activity were normal. The findings suggest an intrinsic or cellular defect of circulating neutrophil granulocytes in patients with PPP.

Adult↗
PubMedDate not supplied

Heterogeneity of lipid A.

In a previous study, lipid A from Shigella flexneri was separated into eight distinct fractions by thin-layer chromatography (TLC). In the present investigation, lipid A from different gram-negative bacteria was analyzed by thin-layer chromatography for its heterogeneity and compared with lipid A of S. flexneri. Purified lipid A preparations from six different enterobacterial species were heterogeneous, but based on Rf, comparable bands were found among all preparations. Changing the culture conditions by using two other culture media resulted in very minor changes in the TLC appearance. Different serotypes of Shigella grown under the same conditions also showed very minor differences. Two bands (5 and 8) in each preparation of lipid A comigrated with lysophosphatidylethanolamine and phosphatidylethanolamine, respectively, and both bands were stained with ninhydrin and molybdenum blue. Therefore, phosphatidylethanolamine, and probably lysophosphatidylethanolamine, are common constitutents of unfractioned lipid A preparations, and both phospholipids can occur even in highly purified unfractionated lipid A.

Chromatography, Thin Layer↗
PubMedDate not supplied

Antibodies to lipid A: occurrence in humans.

Lipid A, the toxic part of the bacterial endotoxin, is a common antigen for many gram-negative bacteria. Antibodies to lipid A occur naturally in humans; they have been found in 10%-34%, and even up to 73%, of individuals tested, as detected by indirect hemolysis and enzyme-linked immunosorbent assay (ELISA), respectively. Inflammatory bowel diseases (Crohn's disease or ulcerative colitis) cause changes in the level of antibodies to lipid A, as compared with that found in healthy control subjects. Increased levels of antibodies to lipid A are seen in both children and adults with infections due to gram-negative bacteria, such as urinary tract infections (UTI). The highest titers of IgG in serum, as detected by ELISA, have been recorded in patients with development or progression of renal scarring associated with UTI. Since lipid A may play a role in the pathogenesis of renal impairment, the determination of the level of antibodies to lipid A may help in the diagnosis of certain forms of UTI. Possible beneficial roles of antibodies to lipid A during septicemia caused by gram-negative bacteria in humans are still unclear.

Antibodies, Bacterial↗