Lack of significance of pili in experimental ascending Escherichia coli pyelonephritis

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Published on: November 21, 2014

L B Guze, F Silverblatt, J Z Montgomerie

    Scandinavian Journal of Infectious Diseases
    |January 1, 1983
    PubMed

    Insights

    Pili, hair-like appendages on bacteria, were investigated for their role in causing kidney infections. Studies found no significant link between the amount of pili on Escherichia coli and the severity of pyelonephritis in mice or human patients.

    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Bacterial Pathogenesis

    Background:

    • Bacterial pili are surface appendages involved in adhesion and colonization.
    • Their role as a virulence factor in urinary tract infections, particularly pyelonephritis, is not fully understood.

    Purpose of the Study:

    • To investigate the correlation between the degree of piliation in Escherichia coli and the severity of acute ascending pyelonephritis.
    • To determine if pilus expression is a significant virulence factor in E. coli-induced kidney infections.

    Main Methods:

    • Experimental pyelonephritis was induced in mice using E. coli strains with varying pilus expression levels.
    • E. coli strains were ranked based on pyelonephritis severity and compared with in vitro piliation intensity.
    • Piliation levels of strains from bladder versus kidney infections were compared.

    Main Results:

    • No significant difference in pyelonephritis severity was observed between mice infected with lightly or heavily piliated E. coli strains.
    • No significant correlation was found between the order-ranked severity of pyelonephritis and in vitro piliation intensity.
    • No significant difference in piliation degree was detected between E. coli strains isolated from bladder versus kidney infections.

    Conclusions:

    • The degree of piliation in Escherichia coli does not appear to be a significant virulence factor in acute ascending pyelonephritis.
    • These findings suggest that other virulence factors may play a more critical role in the pathogenesis of E. coli kidney infections.

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