Scaffold Repurposing of Nucleosides (Adenosine Receptor Agonists): Enhanced Activity at the Human Dopamine and Norepinephrine Sodium Symporters.

ABSTRACT: We have repurposed (N)-methanocarba adenosine derivatives (A₃ adenosine receptor (AR) agonists) to enhance radioligand binding allosterically at the human dopamine (DA) transporter (DAT) and inhibit DA uptake. We extended the structure-activity relationship of this series with small N⁶-alkyl substitution, 5'-esters, deaza modifications of adenine, and ribose restored in place of methanocarba. C2-(5-Halothien-2-yl)-ethynyl 5'-methyl 9 (MRS7292) and 5'-ethyl 10 (MRS7232) esters enhanced binding at DAT (EC₅₀ ∼ 35 nM) and at the norepinephrine transporter (NET). 9 and 10 were selective for DAT compared to A₃AR in the mouse but not in humans. At DAT, the binding of two structurally dissimilar radioligands was enhanced; NET binding of only one radiolig

SUBMITTER: Tosh DK 

PROVIDER: S-EPMC5501184 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature