Abstract
Little is known about the role of alkaline phosphatase (AP) in liver diseases, except for its elevation in jaundice or cholestasis. Its substrate, endotoxin, is usually elevated in patients as well as animals with liver damage. This study aimed to provide evidence for its new role as protection against immunological liver damage. Liver injury was induced in mice by delayed-type hypersensitivity to picryl chloride. AP activity was measured using a commercial kit. In acute liver injury, a significant decrease in AP activity in serum was observed but there was an increase in liver tissue. Single administration of cyclophosphamide before sensitization with picryl chloride exacerbated the liver injury, with more serious AP changes, while consecutive use after the sensitization alleviated the injury with a recovery from the changes. When liver injury proceeded for 1 week, both serum and liver showed decreased AP activity. Lipopolysaccharide facilitated alanine transaminase release from levamisole-pretreated but not non-treated hepatocytes from naive mice. However, the release was confirmed from liver slices of mice with liver injury proceeding for 1 week, even without levamisole pretreatment. The development of liver injury may lead ...Continue Reading
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