Enantioselective kappa opioid binding sites on the macrophage cell line, P388d1.
A kappa (kappa) opioid binding site has been characterized on the macrophage cell line, P388d1, using the kappa selective affinity ligand, [3H] (1S,2S)-(-)-trans-2-isothiocyanato-N-methyl-N-[2-(1- pyrrolidinyl) cyclohexyl] benzeneacetamide (-)BD166). The kappa site has a relative molecular mass (Mr) of 38,000 under nonreducing conditions and 42,000 under reducing conditions. Moreover, it exhibits enantioselectivity in that 1S,2S-(-)-trans-3,4-dichloro-N-methyl-N-[2-1-pyrrolidinyl)cyclohexyl] benzeneacetamide ((-)-U-50,488) blocks [3H](5 alpha, 7 alpha, 8 beta)-(-)-N-methyl-N-[7-(1- pyrrolidinyl)-1-oxaspiro-(4,5)-dec-8-yl]benzeneacetamide (U-69,593) binding to P388d1 cells with an IC50 = 7.0 nM whereas 1R,2R-(+)-trans-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl)cyclohexyl] benzeneacetamide ((+)U-50,488) blocks [3H]U-69,593 binding to P388d1 cells with an IC50 = 7000 nM.
Carr
D J
DJ
Department of Physiology and Biophysics, University of Alabama Birmingham 35294.
DeCosta
B R
BR
Jacobson
A E
AE
Rice
K C
KC
Blalock
J E
JE
D001345:Autoradiography; D001665:Binding Sites; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D008264:Macrophages / Q000378:metabolism*; D011869:Radioligand Assay; D011957:Receptors, Opioid / Q000378:metabolism*; D017473:Receptors, Opioid, kappa; D013237:Stereoisomerism
D011957:Receptors, Opioid; D017473:Receptors, Opioid, kappa