Contribution of cloned virulence factors from uropathogenic E. coli strains to nephropathogenicity in an experimental rat pyelonephritis model
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- Escherichia coli 536 (06:K15:H31), which was isolated from a case of urinary tract infection, determines high nephropathogenicity in a rat pyelonephritis system as measured by renal bacterial counts 7 days after infection. The loss of S fimbrial adhesin formation (Sfa-) (mannose-resistant hemagglutination [Mrh-] and fimbria production [Fim-]), serum resistance (Sre-), and hemolysin production (Hly-) in the mutaßt 536-21 led to a dramatic reduction of bacterial counts from almost tOS to only 40 cells per g of kidney. The reintroduction of theEscherichia coli 536 (06:K15:H31), which was isolated from a case of urinary tract infection, determines high nephropathogenicity in a rat pyelonephritis system as measured by renal bacterial counts 7 days after infection. The loss of S fimbrial adhesin formation (Sfa-) (mannose-resistant hemagglutination [Mrh-] and fimbria production [Fim-]), serum resistance (Sre-), and hemolysin production (Hly-) in the mutaßt 536-21 led to a dramatic reduction of bacterial counts from almost tOS to only 40 cells per g of kidney. The reintroduction of the cloned S fimbrial adhesin determinant (sfa) increases the virulence of the avirulent mutant strain by a factor of 20; almost the same eß'ect was observed after restoration of serum resistance by Integration of an sja+ recombinant cosmid into the chromosome. Additional reintroduction of the my+ phenotype by Iransformation of two hly determinants increased the virulence of the strains. Demolysin production determined increased renal elimination of leukocytes and erythrocytes. Thus all three determinants investigated, S fimbriae, serum resistance, and hemolysin, contribute to the multifactorial phenomenon of E. coli nephropathogenicity.…
Autor(en): | R. Marre, Jörg Hacker, W. Henkel, W. Goebel |
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URN: | urn:nbn:de:bvb:20-opus-59445 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Medizinische Fakultät / Institut für Molekulare Infektionsbiologie |
Sprache der Veröffentlichung: | Englisch |
Erscheinungsjahr: | 1986 |
Originalveröffentlichung / Quelle: | In: Infection and immunity (1986) 54, 761-767. |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Normierte Schlagworte (GND): | Infektionsbiologie |
Datum der Freischaltung: | 20.11.2011 |
Lizenz (Deutsch): | Deutsches Urheberrecht |