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Subcellular Localization of 5′‐Nucleotidase in Rat Brain
Author(s) -
Heymann Dagmar,
Reddington Martin,
Kreutzberg Georg W.
Publication year - 1984
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1984.tb12832.x
Subject(s) - 5' nucleotidase , cytochemistry , myelin , microsome , synaptosome , biochemistry , nucleotidase , membrane , chemistry , mitochondrion , cerebellum , enzyme , biology , central nervous system , endocrinology
The subcellular distribution of the ectoenzyme, 5′‐nucleotidase, in cerebral cortex and cerebellum of the rat was studied both biochemically and cytochemically. The fractions were characterized biochemically by marker enzymes. The localization of 5′‐nucleotidase activity was also investigated cytochemically in the myelin, synaptosomal, mitochondrial, and microsomal fractions. Biochemically 5′‐nucleotidase was found to be enriched in the membrane‐containing fractions, i.e., myelin, synaptosomal, and microsomal fractions. Cytochemistry showed the reaction product in the myelin fraction to be associated with myelin profiles. In the synaptosomal fraction reaction product could occasionally be seen at synaptosomal membranes, although it could not be attributed unequivocally to the synaptosome itself, since in positions with reaction product unidentifiable membrane structures could always be seen attached. Mitochondria were virtually without any reaction product. In the microsomal fraction 5′‐nucleotidase activity was associated with unidentifiable membrane structures. It is concluded that 5′‐nucleotidase is associated with myelin profiles and that the high activity found in the synaptosomal fraction is probably not associated with nerve ending plasma membranes.