{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T01:54:46Z","timestamp":1777946086314,"version":"3.51.4"},"reference-count":0,"publisher":"S. Karger AG","license":[{"start":{"date-parts":[[2008,5,29]],"date-time":"2008-05-29T00:00:00Z","timestamp":1212019200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"},{"start":{"date-parts":[[2008,5,29]],"date-time":"2008-05-29T00:00:00Z","timestamp":1212019200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pharmacology"],"abstract":"<jats:p>Male rats were fed a cholesterol-free diet for 5 weeks, followed by a 2% cholesterol diet for 4 weeks. Another group of rats was continuously fed a cholesterol-free diet. A third group was fed standard pellets during the whole experiment. Hepatic microsomal protein and cholesterol contents and drug-metabolizing enzyme activities were measured. The cholesterol-rich diet increased microsomal protein content and this increase disappeared after trypsin digestion of microsomal membranes. Microsomal cholesterol content was enhanced three-fold by cholesterol feeding. Cytochrome P-450 concentration, NADPH cytochrome c reductase and aryl hydrocarbon hydroxylase activities showed only minor changes following cholesterol feeding. The p-nitroanisole O-demethylase and ethoxycoumarin deethylase activities were doubled by cholesterol in comparison to cholesterol-free diet. Trypsin digestion activated the UDP-glucuronosyltransferase enzyme eight- to ten-fold on a protein basis. Trypsin treatment increased the cholesterol activation of UDP-glucuronosyltransferase when compared to the activity in native microsomes. The data suggest that dietary cholesterol regulates the cholesterol content of microsomal membranes. The activities of drug-metabolizing enzymes are also altered, possibly due to the compositional changes of the membranes.<\/jats:p>","DOI":"10.1159\/000136850","type":"journal-article","created":{"date-parts":[[2008,6,2]],"date-time":"2008-06-02T07:26:06Z","timestamp":1212391566000},"page":"163-172","source":"Crossref","is-referenced-by-count":9,"title":["Dietary Cholesterol-Induced Enhancement of Hepatic Biotransformation Rate in Male Rats"],"prefix":"10.1159","author":[{"given":"E.","family":"Hietanen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"O.","family":"H\u00e4nninen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Laitinen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Lang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"127","published-online":{"date-parts":[[2008,5,29]]},"container-title":["Pharmacology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/karger.com\/article-pdf\/doi\/10.1159\/000136850","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,2]],"date-time":"2026-05-02T15:36:13Z","timestamp":1777736173000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000136850"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,5,29]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1159\/000136850","archive":["Portico"],"relation":{},"ISSN":["0031-7012","1423-0313"],"issn-type":[{"value":"0031-7012","type":"print"},{"value":"1423-0313","type":"electronic"}],"subject":[],"published":{"date-parts":[[2008,5,29]]}}}