L-glutamic acid binding sites in normal and atrophic human cerebellum: Contribution to the study of olivo-pontino-cerebellar
Abstract
The binding kinetics, pharmacological properties, ontogeny and localization of Cl⁻ dependent and/ CI⁻independent L-glutamate binding sites were studied in membrane preparations and sections of human cerebellum. Furthermore L-glutamate binding have been solubilized from the same membrane preparations using different detergents, as CHAPS, Zwittergent 3-12 and Digitonin. At last, a comparative study of L-[³H] glutamate binding sites was done between normal and OPCA (olivocerebellar atrophy) human cerebellum. The results of the above studies are as follows: 1. One binding component was found in both CI⁻ dependent and -independent conditions for L-glutamic acid with Kd values in the order of 150Χ10⁻⁹Μ. Hill plots of these data were linear with Hill coeficient equal to 1.0. Chloride ions provoked a significant increase of L-glutamate binding, with ratio of Cl⁻-dependent/-independent binding sites about 4/1. L-glutamate, L-aspartate, quisqualate, L-homocysteic and ibotenic acid were potent in ...
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