VOPROSY MEDITSINSKOI KHIMII (ISSN 0042-8809)

Changes in the brain GABA system after repeated injections of pyridoxal-5'-phosphate and its Schiff base with GABA

   
Rozanov V.A., Kopelevich V.M., Savitskiĭ I.V.
PubMed Id: 2741411
Year: 1989  Volume: 35  Issue: 2  Pages: 42-46
A state of the gamma-aminobutyric acid (GABA) system (glutamate, glutamate decarboxylase, GABA, GABA-alpha-ketoglutarate aminotransferase) and the coupled reactions (alpha-ketoglutarate dehydrogenase complex, aspartate- and alanine aminotransferases) was studied in three brain structures (cerebellum, brain cortex and truncus cerebri) after multiple administration of pyridoxal-5'-phosphate (PALP) and its Shiff base with GABA (5 injections at doses 10.0 and 15.0 mg/kg of body mass, respectively). Non-coenzymatic effects of PALP were found to prevail within 1 hr after its last administration: inhibition of PALP-dependent aminotransferases and activation of the alpha-keto-glutarate oxidative decarboxylation were observed. The opposite effects were detected after addition of PALP to brain homogenates in vitro. Administration of the PALP-GABA complex exhibited qualitatively similar to those of PALP effects on the reactions studied in brain. The data obtained suggest that parenteral administration of the coenzyme preparation caused a number of metabolic effects, which are sometimes far from unambigously predicted theoretical considerations. The similarity of PALP and PALP-GABA effects appears to demonstrate ready biotransformation of the Shiff base with liberation of PALP and GABA.
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Rozanov, V. A., Kopelevich, V. M., Savitskiĭ, I. V. (1989). Changes in the brain GABA system after repeated injections of pyridoxal-5'-phosphate and its Schiff base with GABA. Voprosy Meditsinskoi Khimii, 35(2), 42-46.
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