849948-77-2Relevant academic research and scientific papers
Superagonism at the human somatostatin receptor subtype 4
Engstroem, Mia,Tomperi, Jussi,El-Darwish, Kamel,Ahman, Mikaela,Savola, Juha-Matti,Wurster, Siegfried
, p. 332 - 338 (2005)
We have discovered a novel compound, J-2156 [(1′S, 2S)-4-amino-N-(1′-carbamoyl-2′-phenylethyl)-2-(4″-methyl- 1″-naphthalenesulfonylamino)butanamide], that belongs to a new class of somatostatin receptor ligands. J-2156 binds with nanomolar affinity to the human somatostatin receptor subtype 4 and is over 400-fold subtype-selective against the other somatostatin receptors. When evaluated in a [35S]guanosine- 5′-O-(3-thio) triphosphate binding assay, J-2156 elicited a response 2 to 3 times as large as that of somatostatin-28 and somatostatin-14. That somatostatin-14 is clearly not a maximally efficacious agonist could be verified by demonstrating that it displays the typical behavior of a partial agonist when tested against J-2156. Increasing concentrations of somatostatin-14 cause a concentration-dependent rightward shift of the dose-response curves for J-2156, without affecting its maximal response. This lack of reduction of the maximal response and the fact that the superior efficacy of J-2156 is detected in membranes argue against desensitization and internalization as possible explanations for the superior efficacy of J-2156. More likely is that somatostatin-14 and J-2156 stabilize distinct receptor conformations that differ in their ability to interact with G-proteins. In a cyclic AMP assay, J-2156, somatostatin-28, and somatostatin-14 all act as full agonists. However, this outcome is most likely due to the presence of a receptor reserve in the cyclic AMP assay since there is a large gain of apparent potency in the cyclic AMP assay and the gain is larger for J-2156 than for somatostatin. We conclude that the endogenous ligands somatostatin-1 4 and somatostatin-28 do not define maximal agonism on the human somatostatin receptor subtype 4 and that J-2156 represents a so-called superagonist.
SOMATOSTATIN RECEPTOR 1 AND/OR 4 SELECTIVE AGONISTS AND ANTAGONISTS
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Page/Page column 31-32, (2008/06/13)
The invention relates to (hetero)arylsulfonylamino based peptidomimetics of formula (I), wherein R1, R2, R3, A, B, D, Q, k and n are defined as disclosed, or a pharmaceutically acceptable salt or ester thereof. Compounds of formula (I) possess high affinity and selectivity for the somatostatin receptor subtypes SSTR1 and/or SSTR4 and can be used for the treatment or diagnosis of diseases or conditions wherein an interaction with SSTR1 and/or SSTR4 is indicated to be useful.
