Abstract

The substantia nigra of Huntington's disease brains shows a 78% reduction in angiotensin-converting enzyme activity in the pars reticulata and a 48% reduction in the pars compacta. The nucleus accumbens shows a 29% reduction in converting enzyme activity. In the rat, after instrastriatal injections of kainic acid 92.5 μg), an agent which selectively destroys neuronal cell bodies, there is a 55% reduction in angiotensin-converting enzyme activity in the ipsilateral substantia nigra. Both human and animal data suggest that a major part of the angiotensin-converting enzyme in the substantia nigra is localized in nerve terminals whose cell bodies originate in the striatyum.

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