Incorporation of 15N from L-leucine into isoleucine by rat brain cerebral cortex slices
✍ Scribed by E. Gheorvassaki; D. Papadakis; F. Alikaridis; T. Kephalas; C. Larsen; G. Palaiologos
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 341 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0360-4012
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✦ Synopsis
The fate of leucine nitrogen in the central nervous system was investigated by incubating rat cerebral cortex slices in the presence of 0.5 mM each of L-['5N]-leucine, L-isoleucine, and L-valine. Analysis of the slices and incubation media for free amino acids by gas chromatography-mass spectrometry revealed that the 15N from leucine is incorporated into isoleucine only. No I5N was detected in valine or any other amino acid. These results suggest that leucine, valine, and their corresponding aminotransferases may be compartmentalized in brain cerebral cortex.