Allosteric modulation of peripheral sigma binding sites by a new selective ligand: SR 31747 (cas 132173-07-0)

Add time:08/02/2019    Source:sciencedirect.com

The interactions of a new compound SR 31747 with sigma sites were examined in rat spleen membranes and in human peripheral blood leukocytes (PBL). Nanomolar concentrations of SR 31747 selectively inhibited in a non-competitive manner the binding of the prototypic sigma ligands [3H](+)-pentazocine, [3H]-3PPP and [3H]DTG on rat spleen membranes. Characterization of SR 31747 binding sites using [3H]SR 31747 as a ligand showed that this compound binds reversibly, with high affinity to one class of sites on rat spleen membranes (Kd 0.66 nM, Bmax 5646 fmol/mg protein). The pharmacological profile of [3H]SR 31747 binding sites was consistent with the presence of specific sites distinct from classical sigma 1 and sigma 2 receptor subtypes strongly suggesting an allosteric modulation of sigma sites by SR 31747. Similarly, [3H]SR 31747 binding sites were demonstrated on human PBL and also on purified subpopulations of human mononuclear cells (granulocytes, NK cells, T4, T8 and B lymphocytes). Administered to mice by i.p. or oral route 30 min before sacrifice, SR 31747 strongly inhibited the binding of [3H](+)-3PPP to mice spleen membranes with ED50 values of 0.18 and 1.43 mg/kg, respectively. Taken together these results could suggest a potential immunological activity of SR 31747 either directly or through allosteric modulation of peripheral sigma sites.

We also recommend Trading Suppliers and Manufacturers of SR 31747 (cas 132173-07-0). Pls Click Website Link as below: cas 132173-07-0 suppliers

Prev:Immunopharmacological profile of SR 31747 (cas 132173-07-0): In vitro and in vivo studies on humoral and cellular responses
Next:The sigma ligand SR 31747 (cas 132173-07-0) prevents the development of acute graft-versus-host disease in mice by blocking IFN-γ and GM-CSF mRNA expression)