Linked Life Data

9182869

Source:http://linkedlifedata.com/resource/pubmed/id/9182869

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1997-7-10
pubmed:abstractText
In many human and murine tissues, both pregnenolone and dehydroepiandrosterone are hydroxylated at the 7alpha and 7beta positions by a cytochrome P450-containing microsomal complex. The 7alpha- and 7beta-hydroxysteroids produced were shown to activate an immune response in mice. Based upon identification by crystallization to constant specific activity and gas chromatography-mass spectrometry analysis, we ascertained that a yeast-expressed human cytochrome P450-1A1 was able to 7beta-hydroxylate pregnenolone (K(M) from 3.2 +/- 0.5 to 4.1 +/- 0.4 microM, turnover number from 117 +/- 15 to 135 +/- 13 pmol/min/nmol of cytochrome P450-1A1). The other human cytochromes P450 tested did not produce identifiable quantities of 7alpha- or 7beta-hydroxylated derivatives of pregnenolone or dehydroepiandrosterone. These findings indicate that cytochrome P450-1A1 involvement in the 7beta-hydroxylation of pregnenolone may contribute to the production of the 7-hydroxylated steroids necessary for activation of the immune defences.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0960-0760
pubmed:author
pubmed:issnType
Print
pubmed:volume
60
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
147-52
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Pregnenolone-7beta-hydroxylating activity of human cytochrome P450-1A1.
pubmed:affiliation
Laboratoire de Biotechnologie, Conservatoire National des Arts et Métiers, Paris, France.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't