title: Protective and opsonic activities of a native, pH 4.25 intravenous immunoglobulin G preparation against common bacterial pathogens.
abstract: The in vitro opsonic activity of a native, pH 4.25 immunoglobulin G preparation modified for intravenous use (IGIV pH 4.25) was compared with the activities of a standard reduced and alkylated, pH 6.8 preparation (IGIV-R/A pH 6.8) and a reduced and alkylated, pH 5.25 preparation (IGIV-R/A pH 5.25) against a variety of common bacterial pathogens. In most instances the opsonic titers of IGIV pH 4.25 equaled or exceeded that of IGIV-R/A pH 6.8; IGIV-R/A pH 5.25 usually had an intermediate level of activity. The protective activity of IGIV pH 4.25 against Escherichia coli in a neonatal rat model was also greater than that of IGIV-R/A pH 6.8. Thus, the functional activity of the new IGIV pH 4.25 apparently equals or exceeds that of standard reduced and alkylated preparations.
mesh_terms: D000818:Animals; D004755:Enterobacteriaceae / Q000276:immunology*; D004926:Escherichia coli / Q000276:immunology; D004927:Escherichia coli Infections / Q000517:prevention & control*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007074:Immunoglobulin G / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000276:immunology* / Q000627:therapeutic use; D016756:Immunoglobulins, Intravenous; D007263:Infusions, Parenteral; D007711:Klebsiella pneumoniae / Q000276:immunology; D009895:Opsonin Proteins / Q000276:immunology*; D011550:Pseudomonas aeruginosa / Q000276:immunology*; D051381:Rats; D011919:Rats, Inbred Strains; D012706:Serratia marcescens / Q000276:immunology
chemical_list: D007074:Immunoglobulin G; D016756:Immunoglobulins, Intravenous; D009895:Opsonin Proteins