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pubmed-article:16735122pubmed:issue17lld:pubmed
pubmed-article:16735122pubmed:dateCreated2006-7-25lld:pubmed
pubmed-article:16735122pubmed:abstractTextThyrotropin-releasing hormone (TRH) analogues in which the N(1)-position of the imidazole ring of the centrally placed histidine residue is substituted with various alkyl groups were synthesized and studied as agonists for TRH receptor subtype 1 (TRH-R1) and subtype 2 (TRH-R2). Analogue 3 (R=C2H5) exhibited binding affinity (Ki) of 0.012 microM to TRH-R1 that is about 1.1-fold higher than that of TRH. Several analogues were found to selectively activate TRH-R2 with greater potency than TRH-R1. The most selective agonist of the series 5 [R=CH(CH3)2] was found to activate TRH-R2 with a potency (EC50) of 0.018 microM but could only activate TRH-R1 at EC50 value of 1.6 microM; that is, exhibited 88-fold greater potency for TRH-R2 versus TRH-R1. The results of this study indicate that modulation of central histidine residue is important for designing analogues which were selective agonist at TRH receptor subtypes.lld:pubmed
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pubmed-article:16735122pubmed:issn0968-0896lld:pubmed
pubmed-article:16735122pubmed:authorpubmed-author:JainRahulRlld:pubmed
pubmed-article:16735122pubmed:authorpubmed-author:GershengornMa...lld:pubmed
pubmed-article:16735122pubmed:authorpubmed-author:KaurNavneetNlld:pubmed
pubmed-article:16735122pubmed:authorpubmed-author:LuXinpingXlld:pubmed
pubmed-article:16735122pubmed:authorpubmed-author:MongaVikramde...lld:pubmed
pubmed-article:16735122pubmed:authorpubmed-author:JosanJatinder...lld:pubmed
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pubmed-article:16735122pubmed:volume14lld:pubmed
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pubmed-article:16735122pubmed:authorsCompleteYlld:pubmed
pubmed-article:16735122pubmed:pagination5981-8lld:pubmed
pubmed-article:16735122pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:16735122pubmed:year2006lld:pubmed
pubmed-article:16735122pubmed:articleTitleSynthesis, receptor binding, and activation studies of N(1)-alkyl-L-histidine containing thyrotropin-releasing hormone (TRH) analogues.lld:pubmed
pubmed-article:16735122pubmed:affiliationDepartment of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S.A.S. Nagar, Punjab 160 062, India.lld:pubmed
pubmed-article:16735122pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16735122pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:16735122pubmed:publicationTypeResearch Support, N.I.H., Intramurallld:pubmed