Effects of Dorsal Bilateral Rhizotomy Treatment on Transmitter Systems in the Spinal Cord of Normal and Spastic Dogs

W. J. McBride, S. Shapiro, E. Chernet, C. Sartorius, P. V. Hall

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The high-affinity uptakes of [3H]serotonin, [3H]-glutamate, and gamma-[3H]aminobutyric acid were studied using a myelin-free crude synaptosomal fraction prepared from the spinal cords of normal dogs and spastic dogs following sham treatment or dorsal bilateral rhizotomy surgery. Compared to sham-operated controls, rhizotomy surgery of normal dogs produced, after 1 week, a 30% reduction in the Vmax value of [3H]glutamate, but did not alter the uptake of gamma-[3H]aminobutyric acid. This treatment also produced a 60% decrease in the Vmax value of [3H]serotonin. Comparison of the effect of rhizotomy surgery on normal and spastic dogs revealed that the spastic group had 60% higher Vmax values for uptakes of [3H]glutamate and gamma-[3H]aminobutyric acid. Comparison of sham-operated spastic dogs and rhizotomy-treated spastic animals showed that there was a 25% decrease in the uptake of both amino acids in the rhizotomy-treated spastic group. Overall, the data (a) support the hypothesis that glutamate is the neurotransmitter from some of the primary afferents, and (b) suggest that sprouting of interneuronal amino acid transmitter systems may occur in the spinal cords of spastic dogs.

Original languageEnglish (US)
Pages (from-to)603-608
Number of pages6
JournalJournal of Neurochemistry
Volume50
Issue number2
DOIs
StatePublished - Feb 1988

Keywords

  • Glutamate uptake
  • Rhizotomy
  • Serotonin uptake.
  • Spasticity
  • Spinal cord
  • γ‐Aminobutyric acid uptake

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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