Linked Life Data

12036373

Source:http://linkedlifedata.com/resource/pubmed/id/12036373

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2002-5-30
pubmed:abstractText
In an effort to develop highly selective and potent agonists and/or antagonists for the hMC3 and hMC4 receptors, a new approach involving the use of linker arms and a backbone to side chain cyclization strategy was employed. Three key analogues were identified to have the required selectivity and potency at the hMC3 or hMC4 receptors, implicated to play pivotal roles in energy homeostasis and other biological effects. The novel cyclic peptide (O)C-CH(2)-CH(2)-C(O)-c-[His(6)-D-Phe(7)-Arg(8)-Trp(9)-Lys(10)]-NH(2) (1) was found to be a highly selective and potent agonist of the hMC4 receptor. Structure-activity studies have shown that replacing the succinyl linker arm of 1 by an o-phthalic acid group and substituting a D-Nal(2')(7) residue in place of D-Phe(7) results in a potent antagonist 7 at the hMC4 receptor. Furthermore, increasing the 23-membered lactam ring of 1 by one carbon atom (succinyl --> glutaric acid linker) gives a highly selective and potent antagonist 9 for the hMC3 receptor. Analogues 1, 7, and 9 therefore represent the first examples of a class of cyclic melanotropin ligands with high selectivity and defined biological activities at the physiologically important hMC3 and hMC4 receptors.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0022-2623
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
45
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2644-50
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Novel cyclic templates of alpha-MSH give highly selective and potent antagonists/agonists for human melanocortin-3/4 receptors.
pubmed:affiliation
Department of Chemistry, College of Science, University of Arizona, 1306 East University, Tucson, AZ 85721, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.