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. 1982 Aug 15;206(2):203–210. doi: 10.1042/bj2060203

The phospholipids of the hepatic endoplasmic reticulum. Structural change in liver injury

Jacqueline L James 1, David E Moody 1, Christine H Chan 1, Edward A Smuckler 1
PMCID: PMC1158575  PMID: 7150241

Abstract

Endoplasmic-reticulum phospholipids were measured during the first hour after carbon tetrachloride administration to male Sprague–Dawley rats and compared with carbon tetrachloride challenge of microsomes from control animals in vitro. The extracted lipids were separated by high-pressure liquid chromatography. No significant differences in the abundance of phosphatidylserine, phosphatidylethanolamine, phosphatidylinositol or phosphatidylcholine were found after either treatment when compared with untreated controls. Diene conjugate formation in each separated phospholipid was determined by measuring A232 and expressed on the basis of lipid phosphorus. Phosphatidylserine was peroxidized 6-fold greater than in controls after challenge in vivo, reaching maximal change after 15min, whereas the other phospholipids showed little or no alteration. Fatty acid composition analysis was performed by g.l.c. after transesterification of individual phospholipids. Phosphatidylserine revealed two types of response: an abrupt decrease in relative abundance of oleic acid (C18:1) and linoleic acid (C18:2) without further loss and a slower, linear decrease in arachidonic acid (C20:4) over the first hour. Similar changes were not seen in other phospholipids. In the `in vitro' model, the relative amounts of the phospholipids do not change. The extent of peroxidation was greater in all the phospholipids than found in vivo, with phosphatidylserine peroxidized to the greatest extent. These data suggest that carbon tetrachloride injury in vivo produces an early peroxidative event and that a specific phospholipid (phosphatidylserine) is selectively modified, although maintaining its relative concentration in the membrane. Dissection of this process in vitro will require refinement of existing systems to reduce the non-specific changes associated with the model system.

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