title: Serum factors and the reticuloendothelial uptake of Staphylococcus aureus. II. Role of a zymosan-adsorbable serum opsonin.
abstract: A heat-stable factor in the serum of normal rabbits adsorbed by zymosan at 16 C in the presence of ethylenediaminetetraacetic acid has been found to enhance the uptake of an encapsulated strain of Staphylococcus aureus (Smith diffuse) by the isolated perfused rabbit liver. This opsonin does not appear to be a rate-limiting component of the hemolytic complement system, properdin, immunoglobulins G or M. It does, however, require the presence of a heat-labile cofactor(s) for expression of its activity.
mesh_terms: D000327:Adsorption; D000818:Animals; D003165:Complement System Proteins / Q000032:analysis; D004355:Drug Stability; D004492:Edetic Acid; D006461:Hemolysis; D006358:Hot Temperature; D007074:Immunoglobulin G / Q000302:isolation & purification; D007075:Immunoglobulin M / Q000302:isolation & purification; D008099:Liver / Q000378:metabolism / Q000382:microbiology; D012157:Mononuclear Phagocyte System / Q000276:immunology*; D009895:Opsonin Proteins / Q000302:isolation & purification; D010477:Perfusion; D010759:Phosphorus Isotopes; D011817:Rabbits; D013210:Staphylococcus / Q000276:immunology*; D015054:Zymosan
chemical_list: D007074:Immunoglobulin G; D007075:Immunoglobulin M; D009895:Opsonin Proteins; D010759:Phosphorus Isotopes; D003165:Complement System Proteins; D015054:Zymosan; D004492:Edetic Acid