There were found certain changes in the total content of phospholipids as well as in the content of their separate fractions in the membranes of endoplasmic reticulum in the rat liver at early stages of carcinogenesis. In the first week under the carcinogen DENA exposure a considerable reduction of the total phospholipids content was noted in the fraction of granular endoplasmic reticulum, while in agranular reticulum during this period of embryogenesis the total content of phospholipids is not changed, but subsequently the former increases as compared with normal values. During the whole period of carcinogenesis under study changes in the phospholipid content are observed in both fractions of endoplasmic reticulum membranes, the greatest changes being noted in the fractions of lysophosphatidicholines, phosphatidilcholines, and phosphatidilinosites.
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