The activity of aspartate aminotransferase a vitamin B6 containing enzyme
was measured in the laysed synaptosomes prepared from rat brain, during
development. Administration of vitamin B6 increased the enzyme activity
throughout development. The stimulating effect of this vitamin was prevented
when the animals were previously treated with D-penicillamine. However,
penicillamine alone had no effect on the pattern of the enzyme activity during
development. Similar results were observed when the synaptosomal preparations
were incubated in the presence of the vitamin, the drug or both. It is concluded that
vitamin B6 content of the brain might be unaffected by D-penicillamine treatment