Effects of turpentine-induced inflammation on the synthesis of dolichol-linked intermediates of N-glycosylation and the phosphorylation of dolichol by CTP-dependent dolichol kinase.
Inflammation was induced in rats by the subcutaneous injection of turpentine. Microsomes were prepared from the livers between 2 and 72 h after injection. Mannose and glucose incorporation into mannosyl and glucosyl dolichyl monophosphate was increased 2-fold over saline-injected controls 24 h after induction of inflammation. Synthesis of glycosylated dolichyl pyrophosphoryl oligosaccharides was also increased compared to controls. Extraction and assay of dolichol monophosphate from inflamed and control rat liver microsomes indicated that the endogenous levels of the lipid were elevated in the inflamed state. CTP-dependent phosphorylation of endogenous dolichol was also found to increase in microsomes from inflamed rats 24 h after injection of turpentine. When exogenous dolichol was added to the microsomal system an increase in phosphorylation was observed as early as 6 h after turpentine injection. Furthermore, the increase appeared to be biphasic, there being two peaks of elevated activity at 12 and 36-48 h after induction of inflammation. The earlier peak was the greater of the two. The results suggest that the increase in glycosylation of dolichol derivatives was due to greater amounts of endogenous dolichol monophosphate. The increase in dolichol monophosphate was itself due to greater availability of dolichol and an increase in the levels of CTP-dependent dolichol kinase.
D000818:Animals; D004224:Diterpenes / Q000378:metabolism*; D004288:Dolichol Phosphates / Q000378:metabolism; D004286:Dolichols / Q000378:metabolism*; D006027:Glycosides; D006602:Hexosyltransferases / Q000378:metabolism; D007249:Inflammation / Q000139:chemically induced / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D010766:Phosphorylation; D010770:Phosphotransferases / Q000378:metabolism*; D017853:Phosphotransferases (Alcohol Group Acceptor); D051381:Rats; D014425:Turpentine / Q000494:pharmacology
D004224:Diterpenes; D004288:Dolichol Phosphates; D004286:Dolichols; D006027:Glycosides; D006602:Hexosyltransferases; D010770:Phosphotransferases; D017853:Phosphotransferases (Alcohol Group Acceptor); C020087:dolichol kinase; D014425:Turpentine