Abstract:
:At 0 degrees C, when Na+ was the only cation present in the incubation medium, increasing the Na+ concentration from 3 to 10 mM enhanced the affinity of [3H]1-[2-(++di-phenylmethoxy)ethyl]-4-(3-phenyl-2-propenyl)piperaz ine [( 3H]GBR 12783) for the specific binding site present in rat striatal membranes without affecting the Bmax. For higher Na+ concentrations, specific binding values plateaued and then slightly decreased at 130 mM Na+. In a 10 mM Na+ medium, the KD and the Bmax were, respectively, 0.23 nM and 12.9 pmol/mg of protein. In the presence of 0.4 nM [3H]GBR 12783, the half-maximal specific binding occurred at 5 mM Na+. A similar Na+ dependence was observed at 20 degrees C. Scatchard plots indicated that K+, Ca2+, Mg2+, and Tris+ acted like competitive inhibitors of the specific binding of [3H]GBR 12783. The inhibitory potency of various cations (K+, Ca2+, Mg2+, Tris+, Li+, and choline) was enhanced when the Na+ concentration was decreased from 130 to 10 mM. In a 10 mM Na+ medium, the rank order of inhibitory potency was Ca2+ (0.13 mM) greater than Mg2+ greater than Tris+ greater than K+ (15 mM). The requirement for Na+ was rather specific, because none of the other cations acted as a substitute for Na+. No anionic requirement was found: Cl-, Br-, and F- were equipotent. These results suggest that low Na+ concentrations are required for maximal binding; higher Na+ concentrations protect the specific binding site against the inhibitory effect of other cations.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Bonnet JJ,Benmansour S,Vaugeois JM,Costentin Jdoi
10.1111/j.1471-4159.1988.tb02979.xsubject
Has Abstractpub_date
1988-03-01 00:00:00pages
759-65issue
3eissn
0022-3042issn
1471-4159journal_volume
50pub_type
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