Abstract

The benzodiazepine receptor in the cortex of 1 spontaneously epileptic baboon exhibited an increased rate of thermal inactivation at 65 degrees C when compared with those from 3 other baboons. In other respects (receptor concentration, affinities for flunitrazepam and diazepam, and response to changing pH), the benzodiazepine receptor from this animal was very similar to the receptors in the cortex of 3 other baboons. The 3H-QNB (muscarinic) and 3H-naloxone (opiate) binding sites in the brain of all 4 baboons appeared very similar with respect to all parameters studied (thermal stability, concentration, regional distribution, and affinities for respective ligands). An endogenous factor stabilizing the benzodiazepine receptor could be lacking in the spontaneously epileptic baboon.

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