Abstract
In the isolated perfused rat hearts, the activity of tissue ornithine decarboxylase gradually decreases over 90 min. In contrast, the activity of S-adenosylmethionine decarboxylase, lactate dehydrogenase, and glutamate-oxalacetate transaminase stays unchanged after a small decrease during the first 10 min. Ornithine decarboxylase is released from the perfused heart under conditions in which neither the lower molecular weight S-adenosylmethionine decarboxylase nor polyamines leak out. Ten minutes of ischaemia did not change the rate of release of ornithine decarboxylase. Ischaemia followed by reperfusion (20 min) increased release of ornithine decarboxylase.
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