Abstract:
:Endotoxin exposure elicits various responses in mammals including the acute phase response that has been shown to cause changes in the activity of several forms of cytochrome P450s and other enzymes. Therefore, the hepatic conjugating enzyme, glutathione S-transferase (GST), and UDP-glucuronosyltransferase (UDPGT), the antioxidant enzymes, glutathione peroxidase (GSHPx), catalase, and superoxide dismutase (SOD), as well as lipid peroxidation were investigated following the administration of endotoxin to male Sprague-Dawley rats (8 mg/kg body weight). Rats were euthanized at various times following endotoxin administration and the livers removed and processed to assess various enzyme activities. Glutathione S-transferase, UDPGT, and GSHPx activity showed statistically significant decreases after 24 hours and remained lower than controls for the duration of the study. Decreases in total SOD and catalase activities were seen at 24, 48, and 72 hours following endotoxin administration; however, only catalase activity showed statistically significant differences between control and treated samples at those time points, and total SOD activity showed a statistically significant decrease at 24 hours. No statistically significant changes were seen in the level of lipid peroxidation in the liver microsomes from endotoxin-treated animals. Changes in the conjugative enzymes and the free-radical scavenging enzymes following endotoxin exposure may alter the host's metabolism and response to free radicals.
journal_name
J Biochem Mol Toxicoljournal_title
Journal of biochemical and molecular toxicologyauthors
Watson AM,Warren G,Howard G,Shedlofsky SI,Blouin RAdoi
10.1002/(sici)1099-0461(1999)13:2<63::aid-jbt1>3.0subject
Has Abstractpub_date
1999-01-01 00:00:00pages
63-9issue
2eissn
1095-6670issn
1099-0461pii
10.1002/(SICI)1099-0461(1999)13:2<63::AID-JBT1>3.0journal_volume
13pub_type
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