title: Degradation of non-opsonized 32P-labelled E. coli by unstimulated mouse peritoneal macrophages. Evaluation of a method.
abstract: Five hours after the ingestion of non-opsonized E. coli by mouse peritoneal macrophages in vitro, 60-70 per cent of the bacteria were killed, estimated as decrease in colony forming units. When employing 32P-labelled E. coli, 50-60 per cent of the radioactivity was released to the medium by the macrophages during the same period of time. The mean number of visually-counted bacteria per macrophage was constant in the post-ingestive period. The macrophages killed the bacteria without early destruction. The release of radioactivity seemed to reflect the degradation of bacteria in the macrophages.
mesh_terms: D000818:Animals; D001202:Ascitic Fluid / Q000166:cytology; D003470:Culture Media; D004926:Escherichia coli / Q000276:immunology*; D008264:Macrophages / Q000276:immunology*; D008297:Male; D051379:Mice; D010587:Phagocytosis; D010761:Phosphorus Radioisotopes; D013997:Time Factors
chemical_list: D003470:Culture Media; D010761:Phosphorus Radioisotopes