Add time:08/08/2019         Source:sciencedirect.com

Rats were treated with various inducers of the endoplasmic reticulum and peroxisomes and the properties and distributions of dolichol and dolichyl phosphate analyzed. The treatment of rats with carcinogenic agents 2-acetylaminofluorene, N-nitrosodiethylamine and 3-methylcholanthrene and with the compounds such as phenobarbital, terpentine, cholestyramine and di(2-ethylhexyl)phthalate have all caused changes in the microsomal or lysosomal contents of dolichol to various extents, but only the latter group influenced dolichyl-P concentration. Shortly after birth, the hepatic content of dolichyl-P reaches the adult level, whereas the level of the free alcohol is low at birth but increases continuously thereafter. Incorporation of [3H]mevalonate into dolichol was also dependent on factors other than de novo synthesis, e.g., the pool size. Rates of glycosylation reactions dependent on dolichyl-P exhibit considerable changes but are independent of the existing levels of lipid intermediate. GDP-mannosyl transferase activity increases greatly with birth, but the enzyme activity returns to the adult level within a day after birth. These results demonstrate that structural and functional modifications induced with drugs can greatly influence the content and distribution of dolichol which are independent of the existing levels of dolichyl-P.

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