title: Light and electron microscopic studies on experimental nocardia-toxicosis in mice.
abstract: An exotoxin (HS-6) produced by Nocardia otitidiscaviarum isolated from certain lesions of cutaneous nocardiosis of a male 82-year-old patient induced severe injuries in the pancreas, liver, stomach, small intestine, heart, thymus and kidney of male ICR mice. Mice given Nocardia-free preparation of HS-6 at a dose of 1 mg/kg of body weight developed several autophagic vacuoles in the pancreas and liver within 20 min after the i.p. injection. Thereafter, the autophagic vacuoles increased in number and size with time. About 24 hr after the administration of HS-6, the liver showed marked accumulation of fat droplets in the cytoplasm of the hepatocytes. Although they contained abundant autophagic vacuoles in the regions of RER, there were no lipomatoses in the acinar cells of the pancreas, those of the chief cells and smooth muscle cells of the stomach, Paneth cells, goblet cells, smooth muscle cells of the small intestine, and plasma cells in the digestive tract. Biochemical examinations revealed that HS-6 had no significant effect on the protein synthesis of reticulocytes. Inoculation of the Nocardia into the mouse peritoneal cavities caused marked granulomatoses in the pancreas, liver and regional lymph nodes, but did not develop autophagic vacuoles in RER regions of these organs.
authors.affiliation: Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Terao
authors.forename: E
authors.initials: E
authors.lastname: Ito
authors.forename: M
authors.initials: M
authors.lastname: Oarada
authors.forename: M
authors.initials: M
authors.lastname: Ohkusu
authors.forename: K
authors.initials: K
authors.lastname: Yazawa
authors.forename: Y
authors.initials: Y
authors.lastname: Mikami
authors.forename: K
authors.initials: K
authors.lastname: Igarashi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D001427:Bacterial Toxins / Q000633:toxicity*; D009202:Cardiomyopathies / Q000378:metabolism / Q000473:pathology; D005098:Exotoxins / Q000633:toxicity*; D006801:Humans; D007410:Intestinal Diseases / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D008107:Liver Diseases / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D008854:Microscopy, Electron; D009617:Nocardia Infections / Q000473:pathology*; D010182:Pancreatic Diseases / Q000378:metabolism / Q000473:pathology; D012874:Skin Diseases, Infectious / Q000382:microbiology
chemical_list: D001427:Bacterial Toxins; D005098:Exotoxins; C078066:HS-6, Nocardia