Identification of GABA receptor binding sites in rat and rabbit uterus.

The present study provides evidence for the presence of gamma-aminobutyric acid (GABA) and L-glutamate decarboxylase in the uteri of the rat and the rabbit. Furthermore, it has been demonstrated for the first time that the uterine tissue contains high-affinity GABAA receptor binding sites in a high density. The present findings indicate that GABA may have a role in the uterine functions.