Amino Acid Changes in a Genetic Strain of Epileptic Beagle Dogs

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Abstract
A neurochemical evaluation of beagle dogs with naturally occurring spontaneous generalized convulsive seizures was performed. Amino acid profiles of serum, cerebrospinal fluid (CSF), and biopsied cerebral cortex from epileptic dogs were compared with those from seizure‐free siblings. No differences in absolute levels were noted. However, when levels were normalized as a percent of total free amino acids, the two groups differed in certain respects. Ten significant correlations between amino acid pairs appeared in epileptic dogs, but only one was seen in seizure‐free animals. Seven of these ten corretions involved glutamate or taurine. It was noted that the highly correlated amino acids (taurine, glutamate, glycine, glutamine, alanine) all utilize sodium‐dependent membrane transport processes. The sum of glutamate, aspartate, and glycine levels (competing sodium‐dependent high‐affinity systems) was significantly lower in epileptic beagles. Since this difference was noted in serum but not CSF or brain, it may indicate a diminished capacity of sodium‐dependent high‐affinity renal transport for acidic and certain small neutral amino acids.