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Anti-staphylococcal serine proteinase and other serum factors in phagocytosis

J Miedzobrodzki1, M Gorka, A Wasniowska

  • 1Department of Microbiology and Immunology, Technical University AGH, Krakow, Poland.

Journal of Basic Microbiology
|January 1, 1990
PubMed

Insights

Phagocytosis of Staphylococcus saprophyticus by human polymorphonuclear cells (PMN) was enhanced by opsonization. Antibodies against V8 serine proteinase and complement significantly increased PMN phagocytic activity.

Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Polymorphonuclear cells (PMN) are crucial immune cells involved in pathogen clearance.
  • Staphylococcus saprophyticus is a common cause of urinary tract infections.
  • Bacterial serine proteinases can play a role in pathogen virulence and immune evasion.

Purpose of the Study:

  • To investigate the interactions between human PMN and Staphylococcus saprophyticus.
  • To determine the effect of opsonization with specific antibodies and complement on PMN phagocytosis of S. saprophyticus.
  • To evaluate the role of antibodies against Staphylococcus aureus V8 serine proteinase in modulating phagocytosis.

Main Methods:

  • Incubation of human peripheral PMN with Staphylococcus saprophyticus.
  • Opsonization of bacteria using rabbit antibodies against S. aureus V8 serine proteinase (gamma-globulin and IgG fractions) and normal rabbit serum proteins.
  • Addition of complement to opsonized bacteria.
  • Measurement of the phagocytosis index to quantify bacterial uptake by PMN.

Main Results:

  • Phagocytosis index values were significantly increased when PMN were incubated with opsonized S. saprophyticus.
  • Enhanced phagocytosis was observed with anti-serine proteinase gamma-globulin serum fraction, anti-serine proteinase IgG, and normal rabbit serum.
  • Complement further augmented the phagocytic activity of PMN.

Conclusions:

  • Antibodies targeting Staphylococcus aureus V8 serine proteinase can enhance the phagocytosis of Staphylococcus saprophyticus by human PMN.
  • Opsonization with normal rabbit serum and complement also promotes bacterial clearance.
  • These findings highlight the potential of antibody-mediated immune responses in combating S. saprophyticus infections.

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