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. 1985 May 1;227(3):737–741. doi: 10.1042/bj2270737

Comparison of the activities of some peroxisomal and extraperoxisomal lipid-metabolizing enzymes in liver and extrahepatic tissues of the rat.

P Van Veldhoven, G P Mannaerts
PMCID: PMC1144900  PMID: 4004795

Abstract

Peroxisomal (acyl-CoA oxidase and peroxisomal dihydroxyacetone-phosphate acyltransferase) and extraperoxisomal (mitochondrial fatty acid oxidation, extraperoxisomal dihydroxyacetone-phosphate acyltransferase, mitochondrial and microsomal glycerophosphate acyltransferases) lipid-metabolizing enzymes were measured in homogenates from rat liver and from seven extrahepatic tissues. Except for jejunal mucosa and kidney, extrahepatic tissues contained very little acyl-CoA oxidase activity. Peroxisomal dihydroxyacetone-phosphate acyltransferase, taken as the activity that was not inhibited by 5 mM-glycerol 3-phosphate, was present in all tissues examined, and its specific activity in liver and extrahepatic tissues was roughly of the same order of magnitude. Clofibrate treatment increased the activity of acyl-CoA oxidase in liver, and to a smaller extent also in kidney, but did not influence the activity of peroxisomal dihydroxyacetone-phosphate acyltransferase. Comparison of the activities of peroxisomal and extraperoxisomal lipid-metabolizing enzymes in extrahepatic tissues and in liver, an organ in which the contribution of peroxisomes to fatty acid oxidation and to glycerolipid synthesis has been estimated previously, suggests that, as in liver, peroxisomal long-chain fatty acid oxidation is of minor quantitative importance in extrahepatic tissues, but that in these tissues (micro)-peroxisomes are responsible for most of the dihydroxyacetone phosphate acylation and, consequently, for initiating ether glycerolipid synthesis.

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Selected References

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