Agonist-directed trafficking of porcine α2A-adrenergic receptor signaling in Chinese hamster ovary cells: l-isoproterenol selectively activates Gs was written by Brink, Christiaan B.;Wade, Susan M.;Neubig, Richard R.. And the article was included in Journal of Pharmacology and Experimental Therapeutics in 2000.Electric Literature of C10H17Cl2N3S This article mentions the following:
In this study, we investigated the hypothesis of agonist-directed trafficking of receptor signaling for the α2A-adrenergic receptor (α2A-AR). α2A-ARs couple to both Gs and Gi to stimulate or inhibit adenylyl cyclase activity. Chinese hamster ovary-K1 cell lines expressing the porcine α2A-AR at high (α2A-H) and low (α2A-L) levels were used to estimate the relative efficacies (R.e.s) of a series of agonists for the Gs and Gi pathways. Gs-mediated responses were measured after pertussis toxin treatment to inactivate Gi in α2A-H, whereas Gi responses were measured in α2A-L, where Gs responses were absent. The full agonist UK-14,304 showed a large receptor reserve for Gi responses in α2A-H but little receptor reserve for Gs responses in α2A-H or for Gi responses in α2A-L. With the exception of l-isoproterenol (ISO), all agonists showed similar R.e.s. at the α2A-AR for Gs and Gi responses, with rank orders of R.e.s as follows: l-epinephrine = l-norepinephrine = UK-14,304 > p-aminoclonidine ≥ BHT-920 ≥ BHT-933 > clonidine = p-iodoclonidine ≥ xylazine ≥ guanabenz. Interestingly, ISO had the highest efficacy at the α2A-AR for activating Gs vs. Gi (9-fold higher); however, it had low potency for both. By several criteria, the ISO response was mediated by the α2A-AR, supporting the hypothesis of agonist-directed trafficking of receptor signaling or agonist-specific G protein selectivity. In contrast, the apparent Gi pathway selectivity of oxymetazoline appears to be mediated by an endogenous serotonergic receptor. It is intriguing that a classic β-AR agonist that activates Gs through β2-ARs also appears to produce a Gs-selective conformation of the Gi-coupled α2A-AR. In the experiment, the researchers used many compounds, for example, 6-Allyl-5,6,7,8-tetrahydro-4H-thiazolo[4,5-d]azepin-2-amine dihydrochloride (cas: 36085-73-1Electric Literature of C10H17Cl2N3S).
6-Allyl-5,6,7,8-tetrahydro-4H-thiazolo[4,5-d]azepin-2-amine dihydrochloride (cas: 36085-73-1) belongs to thiazole derivatives. Thiazole rings are planar and aromatic. Thiazoles are characterized by larger pi-electron delocalization than the corresponding oxazoles and have therefore greater aromaticity. The nitrogen in thiazole is sp2 hybridized and the lone pair of electrons localized on the nitrogen is less reactive due to increased aromatic character and decreased basicity. It is protonated and alkylated/acylated at nitrogen forming hydrochloride and quaternary thiazolium salt.Electric Literature of C10H17Cl2N3S
Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica