title: Opsonic requirements of Helicobacter pylori.
abstract: The opsonic requirements of Helicobacter pylori were investigated in a series of experiments with human polymorphonuclear leucocytes (PMNL). Pre-incubation of H. pylori with pooled normal human serum (NHS) in concentrations of 5-20% significantly increased the uptake of radiolabelled bacteria by PMNL. Treatment of the bacteria with NHS 30% caused the release of radiolabel and this effect was abolished by heating serum to 56 degrees C, suggesting that H. pylori is serum-sensitive and that complement is involved. Opsonisation of H. pylori with NHS concentrations of 10-30% significantly increased PMNL chemiluminescence. Removal of specific antibody had no effect. Removal of either the classical or alternative complement pathways produced no significant change in PMNL chemiluminescence, indicating that either pathway is sufficient for opsonisation on its own. The results confirm that complement is the most efficient opsonin for H. pylori.
authors.affiliation: Gastrointestinal Unit, Glasgow Royal Infirmary.
authors.forename: A W
authors.initials: AW
authors.lastname: McKinlay
authors.forename: A
authors.initials: A
authors.lastname: Young
authors.forename: R I
authors.initials: RI
authors.lastname: Russell
authors.forename: C G
authors.initials: CG
authors.lastname: Gemmell
mesh_terms: D000704:Analysis of Variance; D003170:Complement Pathway, Alternative / Q000276:immunology; D003171:Complement Pathway, Classical / Q000276:immunology; D003165:Complement System Proteins / Q000276:immunology*; D004306:Dose-Response Relationship, Immunologic; D004533:Egtazic Acid / Q000494:pharmacology; D005753:Gastric Mucosa / Q000276:immunology / Q000382:microbiology; D016481:Helicobacter Infections / Q000276:immunology; D016480:Helicobacter pylori / Q000276:immunology*; D006358:Hot Temperature / Q000009:adverse effects; D006801:Humans; D008163:Luminescent Measurements; D009504:Neutrophils / Q000276:immunology; D009895:Opsonin Proteins / Q000276:immunology*; D010587:Phagocytosis / Q000502:physiology*; D014774:Virulence / Q000502:physiology
chemical_list: D009895:Opsonin Proteins; D004533:Egtazic Acid; D003165:Complement System Proteins