SB269652 

SB269652 is the first drug-like allosteric modulator of the dopamine D2 receptor (D2R); a new chemical probe that can differentiate D2R monomers from dimers or oligomers depending on the observed pharmacology. IC50 value: 0.2/0.5 nM [1] Target: D3 receptor antagonist SB269,652 potently (low nanomolar range) abolished specific binding of [(3)H]nemanopride and [(3)H]spiperone to Chinese hamster ovary-transfected D(3) receptors when radioligands were used at 0.2 and 0.5 nM, respectively. However, even at high concentrations (5 μM), SB269,652 only submaximally inhibited the specific binding of these radioligands when they were employed at 10-fold higher concentrations. By analogy, although SB269,652 potently blocked D(3) receptor-mediated activation of Gα(i3) and phosphorylation of extracellular-signal-regulated kinase (ERK)1/2, when concentrations of dopamine were increased by 10-fold, from 1 μM to 10 μM, SB269,652 only submaximally inhibited dopamine-induced stimulation of Gα(i3) [1].

426.55

C₂₇H₃₀N₄O

215802-15-6

Solid

White to off-white

O=C(C1=CC2=C(C=CC=C2)N1)N[C@H]3CC[C@H](CCN(CC4)CC5=C4C=CC(C#N)=C5)CC3

Room temperature in continental US; may vary elsewhere.

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

• [1]. Silvano E, et al. The tetrahydroisoquinoline derivative SB269,652 is an allosteric antagonist at dopamine D3 and D2 receptors. Mol Pharmacol. 2010 Nov;78(5):925-34.  [Content Brief]

  [2]. Lane JR, et al. A new mechanism of allostery in a G protein-coupled receptor dimer. Nat Chem Biol. 2014 Sep;10(9):745-52.  [Content Brief]

  [3]. Presgraves SP, et al. Involvement of dopamine D(2)/D(3) receptors and BDNF in the neuroprotective effects of S32504 and pramipexole against 1-methyl-4-phenylpyridinium in terminally differentiated SH-SY5Y cells. Exp Neurol. 2004 Nov;190(1):157-70.  [Content Brief]