Linked Life Data

2609361

Source:http://linkedlifedata.com/resource/pubmed/id/2609361

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1990-2-14
pubmed:abstractText
Homogenates from four adrenal pheochromocytomas converted 4-14C-labeled pregnenolone, 17-hydroxyprogesterone, and dehydroepiandrosterone into androstenedione and testosterone. In addition to these androgens, labeled pregnane substrates were also transformed into corticosteroids, as previously reported, and this conversion occurred in even higher yield. The formation of labeled metabolites of either pathway was greater in homogenates from intraadrenal pheochromocytomas than in those derived from an extraadrenal tumor, but less than in preparations of hyperplastic adrenal cortex. Incubations of subcellular fractions isolated from an adrenal pheochromocytoma showed that the enzyme activities involved in androgen formation from the radioactive substrates studied were associated with the microsomes and required exogenous cofactors. In contrast to adrenocortical tissue, chromaffin cell preparations uniformly failed to convert substrate [4-14C] cholesterol into either androgens or corticosteroids. The data available demonstrate the presence in chromaffin tissue of all of the enzyme activities required for the biosynthesis of androgens and corticosteroids except for those involved in the side-chain scission of cholesterol.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0039-128X
pubmed:author
pubmed:issnType
Print
pubmed:volume
54
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
647-59
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Biosynthesis of androgens by pheochromocytomas.
pubmed:affiliation
Research Service, Veterans Administration Medical Center, Miami, FL.
pubmed:publicationType
Journal Article