Linked Life Data

1269874

Source:http://linkedlifedata.com/resource/pubmed/id/1269874

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1976-8-2
pubmed:abstractText
Bile acid synthesis calculated from respiratory (14)CO2 derived from the catabolism of [26 or 27-(14)C]cholesterol to bile acids in rats with intact enterohepatic circulations decreased 50% after 5 days of ethinyl estradiol treatment (5 mg per kg per day). Maximal derepressed bile acid synthesis, measured as biliary bile acid excretion after bile acid pool depletion, was also reduced 50% by ethinyl estradiol treatment. Because ethinyl estradiol did not alter biliary cholesterol excretion, bile contained less bile acid relative to cholesterol. Hepatic bile acid concentration was not increased by ethinyl estradiol treatment. Because the inhibitory effect of ethinyl estradiol on bile acid synthesis required 5 days of treatment it is concluded that bile acid synthesis probably was not reduced by negative feedback repression of 7alpha-hydroxylase, the rate-limiting enzyme in bile acid synthesis, which has a half-life of 2 to 3 hr. During the first 14 hr after bile duct cannulation, before bile acid pool depletion, ethinyl estradiol-treated rats excreted less than one-half as much bile acid and the same amount of cholesterol as controls. The bile acid to cholesterol ratio was therefore decreased. Rats treated simultaneously with phenobarbital and ethinyl estradiol excreted significantly more bile acid than rats treated with ethinyl estradiol alone, but biliary cholesterol excretion was not increased. The proportion of biliary bile acid relative to cholesterol was thereby restored to the control value. In contrast, after 14 hr of bile drainage and depletion of the bile acid pool, rats treated with ethinyl estradiol and those treated with phenobarbital-ethinyl estradiol excreted the same amount of bile acid. Thus, when phenobarbital is administered with ethinyl estradiol, it increases the bile acid pool size and biliary bile acid excretion, but it does not increase bile acid synthesis. The increase in pool size and biliary bile acid excretion might be due to the phenobarbital-induced increase in ileal absorption of bile acids.
pubmed:keyword
http://linkedlifedata.com/resource/pubmed/keyword/Animals, Laboratory, http://linkedlifedata.com/resource/pubmed/keyword/Biology, http://linkedlifedata.com/resource/pubmed/keyword/Clinical Research, http://linkedlifedata.com/resource/pubmed/keyword/Contraception, http://linkedlifedata.com/resource/pubmed/keyword/Contraceptive Agents, http://linkedlifedata.com/resource/pubmed/keyword/Contraceptive Agents, Estrogen, http://linkedlifedata.com/resource/pubmed/keyword/Contraceptive Agents, Female, http://linkedlifedata.com/resource/pubmed/keyword/ETHINYL ESTRADIOL, http://linkedlifedata.com/resource/pubmed/keyword/Estrogens, http://linkedlifedata.com/resource/pubmed/keyword/Family Planning, http://linkedlifedata.com/resource/pubmed/keyword/Hormones, http://linkedlifedata.com/resource/pubmed/keyword/Physiology, http://linkedlifedata.com/resource/pubmed/keyword/Research Methodology, http://linkedlifedata.com/resource/pubmed/keyword/Urogenital Effects, http://linkedlifedata.com/resource/pubmed/keyword/Urogenital System
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0016-5085
pubmed:author
pubmed:issnType
Print
pubmed:volume
70
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1130-5
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1976
pubmed:articleTitle
Effects of ethinyl estradiol and phenobarbital on bile acid synthesis and biliary bile acid and cholesterol excretion.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.