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Related Experiment Videos

Effect of sulfide ions on complement factor C3.

M Granlund-Edstedt1, E Johansson, R Claesson

  • 1Department of Oral Microbiology, University of Umeå, Sweden.

Infection and Immunity
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

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Sulfide, found in periodontal disease, can interfere with host defenses by affecting complement component C3. This interaction may hinder the ability of immune cells to clear bacteria.

Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Sulfide is present in high concentrations at infected sites like periodontal pockets.
  • Previous research indicated sulfide interferes with bacterial opsonization by host immune cells.
  • Sulfide's potential toxicity via disulfide bond cleavage in proteins was hypothesized.

Purpose of the Study:

  • To investigate sulfide's effect on disulfide bonds of serum proteins involved in opsonization.
  • To determine if sulfide impacts complement component C3, crucial for bacterial clearance.

Main Methods:

  • Serum proteins were exposed to 2 mM sulfide under anaerobic conditions.
  • Proteins were analyzed using SDS-PAGE and immunoblotting to detect disulfide bond cleavage.
  • Specific focus was placed on complement component C3 and its opsonization function.

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Main Results:

  • Sulfide showed limited capacity to cleave disulfide bonds in most tested serum proteins.
  • A significant effect was observed on complement component C3 (specifically C3bi).
  • Sulfide released the C-terminal region of C3bi's alpha chain, which is vital for binding to immune cells.

Conclusions:

  • Sulfide can disrupt the opsonization process by altering complement component C3.
  • This alteration may impair the binding of C3bi-coated bacteria to complement receptor 3 on immune cells.
  • Sulfide's effect on C3bi could significantly compromise bacterial clearance in periodontal disease settings.