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Studies on novel pili from Shigella flexneri. I. Detection of pili and hemagglutination activity

A Utsunomiya1, T Naito, M Ehara

  • 1Department of Bacteriology, Nagasaki University, Japan.

Microbiology and Immunology
|January 1, 1992
PubMed

Insights

Researchers identified novel pili on Shigella flexneri clinical isolates using electron microscopy. These structures exhibit unique mannose-resistant hemagglutination properties, distinct from previously described type 1 pili.

Area of Science:

  • Microbiology
  • Microbial Morphology

Background:

  • Shigella flexneri is a significant human pathogen.
  • Pili are crucial for bacterial adhesion and virulence.
  • Previous research has characterized mannose-sensitive (MS) type 1 pili.

Purpose of the Study:

  • To investigate the presence and morphology of pili in clinical isolates of Shigella flexneri.
  • To characterize the hemagglutination properties of these pili.

Main Methods:

  • Clinical isolates of Shigella flexneri were continuously subcultivated in liquid media.
  • Pili were detected and visualized using electron microscopy.
  • Hemagglutination assays were performed using fowl and horse erythrocytes.

Main Results:

  • Electron microscopy revealed thin, flexible, cylindrical pili (2-5 microns length, 3-5 nm diameter).
  • Two strains exhibited mannose-resistant (MR) hemagglutination to fowl erythrocytes (type 4).
  • One strain showed MR hemagglutination to tannic acid-treated horse erythrocytes (type 3).

Conclusions:

  • Shigella flexneri clinical isolates possess novel pili.
  • These pili display distinct mannose-resistant hemagglutination characteristics.
  • The identified pili differ morphologically and functionally from previously described MS type 1 pili.

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