Abstract
Axonal transport of [3H]GABA from substantia nigra to the pontomesencephalic tegmentum was demonstrated in rats pretreated with the GABA-transaminase inhibitor, gamma-vinyl-GABA. In addition, kainic acid lesions of substantia nigra resulted in a significant loss of glutamic acid decarboxylase activity in the vicinity of the ipsilateral pedunculopontine nucleus and in adjacent tissue of the pontomesencephalic tegmentum. These data support the thesis that the nigrotegmental projection is both diffuse and GABAergic.
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