Pharmacological studies on novel neurotensin mimetics: Discovery of a pharmacologically unique agent exhibiting concentration-dependent dual effects as antagonist and agonist

B. Cusack, E. Richelson, Y. P. Pang, J. Zaidi, A. P. Kozikowski

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We report the development of two novel neurotensin mimetics (mimics 1 and 2). These compounds were rationally designed and synthesized according to the multiple template approach. We present results of experiments designed to define their pharmacological profiles. In radioligand binding assays with murine neuroblastoma clone N1E-115, we determined the equilibrium dissociation constants for these compounds at the neurotensin receptor. The K(d) values for mimic 1 and mimic 2 were 3.3 μM and 1.9 μM, respectively. Functionally, both mimetics antagonized the neurotensin-stimulated production of cGMP, with K(d) values in the low micromolar range. Interestingly, mimic 2 displayed a dualistic pharmacological profile, which was concentration dependent. At doses in the 10-100 μM range, mimic 2 became a full agonist, stimulating cGMP production in N1E-115 cells with an EC50 value of 19 μM. Furthermore, mimic 1 did not antagonize the cGMP response elicited by mimic 2. When the neurotensin receptor was desensitized with a neurotensin receptor agonist, mimic 2 failed to stimulate significant cGMP production. We propose that mimic 2 binds to a higher affinity site when acting as an antagonist and binds to a lower affinity and different site when acting as an agonist. Thus, mimic 2 would appear to represent a unique pharmacological tool to characterise and neurotensin receptor and its diverse binding sites in N1E- 115 cells.

Original languageEnglish (US)
Pages (from-to)1036-1040
Number of pages5
JournalMolecular pharmacology
Volume44
Issue number5
StatePublished - Jan 1 1993

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology

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