The high-performance liquid chromatographic analysis for the peroxidized phospholipids in equine erythrocytes and skeletal muscle

Hepatic changes in the acute phase of streptozotocin (SZ)-induced diabetes in mice

We have reported the streptozotocin (SZ)-induced hepatic lesions in the subacute phase (4 to 12 weeks after the treatment), which are characterized by appearance of oncocytic hepatocytes, cytomegalic hepatocytes and bile duct hyperplasia. In this study, we focused on the acute phase (6 to 48 hours after the treatment) of the SZ-induced hepatic lesions of mice to clarify the onset of the hepatic alterations, especially before the induction of hyperglycemia. Livers were taken from 8-week-old Crj:CD-1 (ICR) male mice at 6, 12, 24, 36 and 48 hours after the 200 mg/kg b.w. of SZ-injection. SZ-induced hyperglycemia was noted at 36 and 48 hours after the treatment, but the hepatic changes including lipid peroxidation, mitochondrial swelling, peroxisome proliferation and inhibition of hepatocyte proliferation occurred before the elevation of the serum glucose levels. The present findings indicate the direct effects of SZ on hepatocytes rather than the secondary effects of diabetes, and certain correlations between the hepatocytic changes in the acute phase and those in the subacute one. In addition, ulcer and submucosal edema of the gallbladder were observed at 36 or 48 hours after the SZ-treatment, which can be a novel finding in SZ-treated animal.

Changes of hepatic tissue phospholipid peroxidation, malondialdehydes, and antioxidative enzyme activities in dogs with halothane inhalation

To elucidate the pathogenesis of halothane-induced hepatopathy, the changes of hepatic tissue phospholipid peroxidation, malondialdehydes (MDAs), and antioxidative enzyme activities were examined in the portal vein arterialized dogs with halothane inhalation. In group A, which was given halothane inhalation under the hepatic blood flow volume less than 10% of pre-operation volume designated as a hypoxic condition, peroxidized phosphatidylcholine (PC), and free and protein-bound MDA levels significantly increased after inhalation. Although the level of protein bound MDA in group C, given hypoxic condition alone, also increased during the experimental period, the response of this was smaller than that in group A, suggesting that the halothane inhalation enhanced free radical generation under the hypoxic condition. In contrast, no significant changes of these levels were observed in groups B and D, both of which were supplied with sufficient hepatic oxygen as the normoxic condition. In addition, the significant negative correlations between hepatic oxygen supply and total or protein-bound MDA were observed in only halothane inhaled group. These findings suggested that the cause of halothane-induced hepatopathy is closely related to free radicals mainly generated from halothane anaerobic metabolism under the hypoxic condition.