PMID: 9648877Jul 2, 1998Paper

Ornithine decarboxylase in human brain: influence of aging, regional distribution, and Alzheimer's disease

Journal of Neurochemistry
L D MorrisonS J Kish

Abstract

Although experimental animal data have implicated ornithine decarboxylase, a key regulatory enzyme of polyamine biosynthesis, in brain development and function, little information is available on this enzyme in normal or abnormal human brain. We examined the influence, in autopsied human brain, of postnatal development and aging, regional distribution, and Alzheimer's disease on the activity of ornithine decarboxylase. Consistent with animal data, human brain ornithine decarboxylase activity was highest in the perinatal period, declining sharply (by approximately 60%) during the first year of life to values that remained generally unchanged up to senescence. In adult brain, a moderately heterogeneous regional distribution of enzyme activity was observed, with high levels in the thalamus and occipital cortex and low levels in cerebellar cortex and putamen. In the Alzheimer's disease group, mean ornithine decarboxylase activity was significantly increased in the temporal cortex (+76%), reduced in occipital cortex (-70%), and unchanged in hippocampus and putamen. In contrast, brain enzyme activity was normal in patients with the neurodegenerative disorder spinocerebellar ataxia type I. Our demonstration of ornithine decarboxylase ...Continue Reading

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