Source:http://linkedlifedata.com/resource/pubmed/id/11606131
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
22
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pubmed:dateCreated |
2001-10-18
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pubmed:abstractText |
Peptide Ac-Nle(4)-cyclo(5beta-->10epsilon)(Asp(5)-His(6)-D-(2')Nal(7)-Arg(8)-Trp(9)-Lys(10))-NH(2), compound 1, a cyclic derivative of alpha-melanotropin, is a nonselective high affinity antagonist at human melanocortin receptors 3 and 4, and an agonist at melanocortin receptors 1 and 5. To differentiate between the physiological functions of these receptors, antagonists with improved receptor selectivity are needed. In this study, analogues of compound 1 without Ac-Nle(4) or His(6) and/or the amino group of Asp(5) were prepared and tested in binding assays and in functional assays on CHO cells expressing hMC3-5R. Several of these peptides were to be selective, high affinity hMC-4R antagonists. The most interesting was compound 10, named MBP10, cyclo(6beta-->10epsilon)(succinyl(6)-D-(2')Nal(7)-Arg(8)-Trp(9)-Lys(10))-NH(2), an antagonist (IC(50) = 0.5 nM) with 125-fold selectivity over hMC-3R (and of >300-fold selectivity over MC-1RB). This compound had no agonist activity at hMC-3R or hMC-4R and only weak agonist activity at hMC-5R. Examination of the sequences of these new peptides revealed that the D-(2')Nal(7)-Arg(8)-Trp(9) segment of peptide 1 forms the "essential core" required for high affinity and high selectivity of analogues of peptide 1 at hMC-4R, but the "extended core", His(6)-D-(2')Nal(7)-Arg(8)-Trp(9), is necessary for the maximum affinity for hMC-3R and hMC-5R.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Cyclic AMP,
http://linkedlifedata.com/resource/pubmed/chemical/Peptides, Cyclic,
http://linkedlifedata.com/resource/pubmed/chemical/Receptor, Melanocortin, Type 3,
http://linkedlifedata.com/resource/pubmed/chemical/Receptor, Melanocortin, Type 4,
http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Corticotropin,
http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Melanocortin,
http://linkedlifedata.com/resource/pubmed/chemical/alpha-MSH,
http://linkedlifedata.com/resource/pubmed/chemical/melanocortin 5 receptor
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0022-2623
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
25
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pubmed:volume |
44
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
3665-72
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pubmed:dateRevised |
2009-11-19
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pubmed:meshHeading |
pubmed-meshheading:11606131-Animals,
pubmed-meshheading:11606131-Binding, Competitive,
pubmed-meshheading:11606131-CHO Cells,
pubmed-meshheading:11606131-Chromatography, High Pressure Liquid,
pubmed-meshheading:11606131-Cricetinae,
pubmed-meshheading:11606131-Cyclic AMP,
pubmed-meshheading:11606131-Humans,
pubmed-meshheading:11606131-Molecular Conformation,
pubmed-meshheading:11606131-Peptides, Cyclic,
pubmed-meshheading:11606131-Receptor, Melanocortin, Type 3,
pubmed-meshheading:11606131-Receptor, Melanocortin, Type 4,
pubmed-meshheading:11606131-Receptors, Corticotropin,
pubmed-meshheading:11606131-Receptors, Melanocortin,
pubmed-meshheading:11606131-Signal Transduction,
pubmed-meshheading:11606131-Structure-Activity Relationship,
pubmed-meshheading:11606131-alpha-MSH
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pubmed:year |
2001
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pubmed:articleTitle |
Selective, high affinity peptide antagonists of alpha-melanotropin action at human melanocortin receptor 4: their synthesis and biological evaluation in vitro.
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pubmed:affiliation |
Department of Medicinal Chemistry, Merck Research Laboratories, Rahway, NJ 07065, USA. maria_bednarek@merck.com
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pubmed:publicationType |
Journal Article
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