title: Fifth component of complement (C5)-derived high-molecular-weight macrophage chemotactic factor in normal guinea pig serum.
abstract: Normal guinea pig serum contain a chemotactic factor(s) for macrophages. As the chemotactic activity in the serum was absorbed by an anti-C5 antibody affinity column but not by the anti-C3 or anti-macrophage chemotactic factor from skin-1 (MCFS-1) affinity column, the major chemotactic factor in the serum was postulated to be C5-derived. This chemotactic factor, which was a heat-labile molecule with an apparent molecular weight of 150,000 (by gel filtration) and lacked vascular permeability activity, was distinct from the C5a-like anaphylatoxins. Using a combination of a Boyden chamber assay and a morphological polarization assay for the macrophage chemotaxis, it was revealed that this chemotactic factor was latent in plasma and could be activated by incubation for 30 min at 37 degrees C in the presence of a sufficient amount of Ca ion (5 mM) concomitant or not concomitant with the clot formation of the plasma. Precursor of MCFS-1 in plasma was not activated during coagulation.
mesh_terms: D000818:Animals; D002630:Chemotactic Factors / Q000302:isolation & purification* / Q000502:physiology; D003182:Complement C5 / Q000502:physiology*; D005260:Female; D006168:Guinea Pigs; D005779:Immunodiffusion; D008264:Macrophages / Q000502:physiology*; D008297:Male; D008970:Molecular Weight
chemical_list: D002630:Chemotactic Factors; D003182:Complement C5