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POLYAMINE TURNOVER IN DIFFERENT REGIONS OF RAT BRAIN 1

The dynamics of the formation and disappearance of polyamines in rat brain have been examined after intraventricular administration of a tracer dose of [3H]putrescine. After 2 days [3H]putrescine was no longer detectable in any brain region examined. [3H] Spermidine and [3H] spermine were formed in all brain areas. In the midbrain, hypothalamus and cerebellum (regions which manifested the greatest initial accumulation of tritium) the specific radioactivity of spermidine declined with a half‐life of 16‐19 days. However, in areas with a low initial accumulation of tritium (the medulla‐pons, internal capsule, cerebral cortex and corpus striatum) the specific radioactivity of spermidine changed very little between 2 and 19 days after the putrescine administration. Levels of [3H]spermine increased continuously in all brain areas for a 14‐day period after the putrescine injection.