Linked Life Data

8587408

Source:http://linkedlifedata.com/resource/pubmed/id/8587408

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1996-3-28
pubmed:abstractText
We developed a procedure for individual measurement of big endothelin-1 (big ET-1) and the two products of big ET-1 conversion (ET-1 and C-terminal fragment (CTF) of big ET-1 (big ET-1(22-38)), using selective solid-phase extraction and specific radioimmunoassays. These techniques were used to measure the levels of these peptides in extracts of human plasma after brachial artery infusions of big ET-1. Infusion of big ET-1 (50 pmol/min, n = 6) caused a decrease in forearm blood flow from 3.03 to 1.55 ml/dl/min after 60 min (p < 0.05). In agreement, the levels of plasma immunoreactive (IR) big ET-1, ET, and CTF were significantly increased from basal levels in the infused arm (from undetectable to 386 pM, 2.2-7.5 pM, and 0.17-37 pM, respectively; p < 0.05). In the presence of the metalloprotease inhibitor phosphoramidon (30 nmol/min), the increase in IR-ET and the associated vasoconstriction were abolished. However, IR-CTF was still detected, suggesting that either some conversion by phosphoramidon-insensitive endothelin-converting enzyme (ECE) was occurring and/or that CTF was being preserved from further proteolysis by phosphoramidon. These data confirm that exogenous big ET-1 is locally converted to ET-1 and CTF in the human forearm, at least in part by a phosphoramidon-sensitive ECE. Furthermore, because measurable levels of newly synthesized ET-1 are probably rapidly reduced as a result of receptor binding, the assay of IR-CTF may be a more sensitive measure of the overexpression of ET-1 in disease.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0160-2446
pubmed:author
pubmed:issnType
Print
pubmed:volume
26 Suppl 3
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
S34-6
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Measurement of C-terminal fragment of big endothelin-1: a novel method for assessing the generation of endothelin-1 in humans.
pubmed:affiliation
Clinical Pharmacology Unit, University of Cambridge, Addenbrooke's Hospital, England.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't