Lysyl oxidase and collagenase in experimental acute and chronic liver injury.
ABSTRACT Lysyl oxidase and collagenase activities were measured in experimental acute and chronic liver injury in mice and rats, and correlated with collagen synthesis and accumulation. Acute liver injury was induced in mice and rats by a single dose of carbon tetrachloride given by gavage, and also in mice by a single injection of murine hepatitis virus. Chronic liver injury was induced in rats by repeated injections of carbon tetrachloride. Elevated plasma glutamic oxaloacetic transaminase levels, increased hepatic prolyl hydroxylase activity, and increased synthesis of collagen-bound hepatic hydroxyproline occurred in animals with acute as well as with chronic liver injury. However, only chronic liver injury appeared to be associated with fibrosis, increased collagen-bound hydroxyproline content, increased hepatic lysyl oxidase and collagenase activities, as well as with increased serum lysyl oxidase activity. These data suggest that lysyl oxidase and collagenase may play an important role in the collagen accumulation associated with hepatic fibrosis.
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ABSTRACT: We studied the effect of administering glycine, a non-essential amino acid, on liver collagen content and its characteristics in experimental hepatotoxic Wistar rats. All the rats were fed standard pellet diet. Hepatotoxicity was induced by orally administering ethanol (7.9 g kg(-1)) for 30 days. Control rats were given isocaloric glucose solution. Glycine was administered subsequently at a dose of 0.6 g kg(-1) po every day, along with alcohol for the next 30 days. Alcohol administration significantly elevated the levels of liver hydroxyproline and total collagen content, cross-linked fluorescence, shrinkage temperature and lipid peroxidation, whereas it significantly decreased the solubility of liver collagen as compared with the control rats. Simultaneous glycine supplementation to alcohol-fed rats significantly reduced the levels of liver hydroxyproline and total collagen content, cross-linked fluorescence, shrinkage temperature and lipid peroxidation and enhanced the solubility of liver collagen as compared with the unsupplemented alcohol-fed rats. In conclusion, administration of glycine had a positive influence both on the quantitative and qualitative properties of hepatic collagen in alcoholic liver injury.Polish journal of pharmacology 56(1):121-8.
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ABSTRACT: The localization of tissue inhibitor of metalloproteinases (TIMP) in normal and pathological livers was examined by immunohistochemistry using monoclonal antibodies at the light microscopic level. In normal liver, immunoreactive TIMP was detected in smooth muscle cells and endothelial cells of blood vessels, fibroblasts, bile duct cells and Kupffer cells, indicating that TIMP is likely to be a general element of the liver. Immunoreactivity was observed in newly-formed blood vessels, proliferating bile ductules, and fibroblasts in the expanded portal area and fibrous septa of chronic active hepatitis and cirrhosis. TIMP was strongly stained in the capsule of hepatocellular carcinoma. The intensity of the immunoreaction in the capsule was generally greater than that in cirrhotic liver apart from the tumor mass. In three of five cases with hepatocellular carcinoma, endothelial walls in contact with tumor cells were positive.Journal of Gastroenterology 26(1):37-41. DOI:10.1007/BF02779506 · 4.02 Impact Factor
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ABSTRACT: Serum immunoreactive prolyl hydroxylase protein, galactosylhydroxylysyl glucosyltransferase activity, and the aminoterminal propeptide of type III procollagen (S-Pro(III)-N-P) were measured in twenty patients with cirrhosis and ninety with various infectious diseases, and the values were compared with those in sixty apparently healthy Nigerians. The means for all three markers were elevated significantly in the patients with cirrhosis (P less than 0.001), acute viral hepatitis (P less than 0.001), amoebic liver abscess (P less than 0.001) and the early stages of Schistosoma mansoni infection (P less than 0.001 for S-Pro(III)-N-P, P less than 0.005 for the two other markers). The mean S-Pro(III)-N-P was also distinctly elevated during the early stages of Schistosoma haematobium infection (P less than 0.01) and filariasis (P less than 0.001), whereas none of the three markers was elevated during an acute attack of malaria. Significant correlations were found between the values for the three markers within the groups of patients with cirrhosis, amoebic liver abscess and schistosomiasis, the correlations for the pooled group of all patients being highly significant (P less than 0.001). The data suggest that elevated hepatic collagen formation is found not only in cirrhosis but also in several infectious diseases. The three serum markers may be useful for showing the stages of active collagen formation in various liver diseases and for predicting the development of fibrosis in acute cases if the values remain elevated.European Journal of Clinical Investigation 05/1984; 14(2):90-5. DOI:10.1111/j.1365-2362.1984.tb02094.x · 2.83 Impact Factor