Hepatic and renal pathology of intraperitoneally administered microcystin-LR in rainbow trout (Oncorhynchus mykiss).
In 26 hr laboratory trials a dose of 1000 micrograms/kg microcystin-LR (MC-LR) caused 100% mortality in rainbow trout, while no mortality was observed at doses of 400 micrograms/kg or less. The liver to body mass ratio increased in fish exposed to the toxin which was likely due to water retention in the liver. In contrast to mammalian studies, hemorrhage of the liver was rare in fish. Exposure to MC-LR caused widespread hepatocellular swelling and lysis of hepatocyte plasma membranes, resulting in liquifactive necrosis (organelles floating in a milieux of cellular debris). Kidney lesions in the fish consisted of coagulative tubular necrosis with a dilation of Bowman's space. Lesions observed in the liver and kidney of fish exposed to MC-LR were considerably different than those previously reported for mammals.
Kotak
B G
BG
Department of Biological Sciences, University of Alberta, Edmonton, Canada.
Semalulu
S
S
Fritz
D L
DL
Prepas
E E
EE
Hrudey
S E
SE
Coppock
R W
RW
D000818:Animals; D001427:Bacterial Toxins / Q000633:toxicity*; D001835:Body Weight / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D006470:Hemorrhage / Q000139:chemically induced; D007274:Injections, Intraperitoneal; D007684:Kidney Tubules / Q000187:drug effects* / Q000293:injuries / Q000473:pathology / Q000648:ultrastructure; D008099:Liver / Q000166:cytology / Q000187:drug effects* / Q000473:pathology / Q000648:ultrastructure; D008387:Marine Toxins; D052998:Microcystins; D008854:Microscopy, Electron; D017686:Oncorhynchus mykiss; D009929:Organ Size / Q000187:drug effects; D010456:Peptides, Cyclic / Q000008:administration & dosage / Q000633:toxicity*; D011041:Poisoning / Q000401:mortality
D001427:Bacterial Toxins; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; C057862:cyanoginosin LR