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• W2068484552 abstract "To examine brain patterns of metabolic and functional activity, the distribution of cytochrome oxidase, a mitochondrial enzyme marker for neuronal functional activity, was mapped throughout the rat brain. Mapping was done qualitatively by enzyme histochemistry of brain sections cut in three planes (coronal, sagittal and horizontal), and quantitatively by optical densitometry of stained sections and by biochemical assays of brain tissue homogenates. Activity of the enzyme was distributed in characteristic patterns and amounts that differed among various neural pathways, brain nuclei, cerebral cortical areas and layers, and neuron types. Gray matter essentially always had higher enzyme activity than did white matter, by a factor of eight- to 12-fold. Among different neural pathways, cytochrome oxidase activity was relatively high in special sensory, somatosensory and motor systems, and was relatively low in associative, limbic, autonomic and visceral regulatory systems (though exceptional areas were present). Among 11 different neuron types, nearly a two-fold range of histochemical staining intensities was observed, with the darkest staining in neurons of the mesencephalic trigeminal nucleus. The observed patterns of cytochrome oxidase activity were mostly similar to the patterns of 2-deoxyglucose uptake seen previously [Schwartz W. J. and Sharp F. R. (1978) J. comp. Neurol. 177, 335–360; Sokoloff L. et al. (1977) J. Neurochem. 28, 897–916] in conscious, “resting” animals, though some differences were found. For example, whereas 2-deoxyglucose uptake was about three-fold higher in gray matter than in white matter [Sokoloff L. et al. (1977) J. Neurochem. 28, 897–916], cytochrome oxidase activity was about eight- to 12-fold higher. This and other discrepancies probably reflect basic technical differences between these two methods. Compared to 2-deoxyglucose, cytochrome oxidase is more specific for oxidative rather than glycolytic metabolism, and more reflective of overall neuronal functional activity occurring over longer time periods lasting hours to weeks, rather than minutes. The anatomical resolution of cytochrome oxidase histochemistry is also finer than that of 2-deoxyglucose autoradiography, extending to the electron microscopic level. The metabolic map of cytochrome oxidase activity reveals patterns of normal brain function, and may be useful as a baseline for comparison in studies of brain disease, development, ageing and plasticity." @default.
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• W2068484552 date "1995-03-01" @default.
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• W2068484552 title "A metabolic map of cytochrome oxidase in the rat brain: Histochemical, densitometric and biochemical studies" @default.
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• W2068484552 doi "https://doi.org/10.1016/0306-4522(94)00514-6" @default.
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