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Detection of Ornithine Decarboxylase Antizyme in Mouse Brain
Author(s) -
Hietala Oili A.
Publication year - 1983
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.1471-4159.1983.tb08110.x
Subject(s) - ornithine decarboxylase antizyme , ornithine decarboxylase , cytosol , polyamine , biochemistry , enzyme , chemistry , biology , microbiology and biotechnology
Ornithine decarboxylase, the rate‐limiting enzyme in polyamine synthesis, is known to be regulated by a macromolecular inhibitor, termed antizyme, in a number of cellular systems. The present results show that the antizyme is also a functional component of polyamine metabolism in the brain. It could be demonstrated both in normal randomly selected mice and in animals which had been subjected either to intracerebroventricular injection of saline, which is known to cause a transient activation of ornithine decarboxylase, or to l,3‐diamino‐2‐propanol, an antizyme‐inducing agent. When compared to tissues or cell systems studied so far, the cytosol fraction from mouse brain homogenate appeared to contain an exceptionally high amount of antizyme, that was bound to some material other than active ornithine decarboxylase. This feature was seen in all the animal groups studied, being most prominent after saline injection, when the amount of dissociable antizyme exceeded 14‐fold the corresponding released ornithine decarboxylase activity. In untreated animals the excess was about eightfold and after 1,3‐diamino‐2‐propanol about fivefold.