THE EFFECT OF DIABETES, INSULIN AND WALLERIAN DEGENERATION ON LEUCINE METABOLISM OF ISOLATED RAT SCIATIC NERVES

Maria G. Buse, H. Franklin Herlong, Dorothy A. Weigand, S. S. Spicer

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Abstract– 14CO2 production and 14C incorporation into proteins was studied in isolated rat sciatic nerves during incubation with 0.1 mM‐[1‐14C]leucine. Rats were made diabetic with streptozotocin. Nerves from diabetic rats incubated with glucose oxidized more [14C]leucine than controls. This difference was abolished in the presence of insulin (1 mU/ml). The effects of diabetes and insulin on leucine oxidation could not be demonstrated in the absence of glucose. Insulin stimulated the incorporation of [14C] from leucine into proteins by nerves from controls and diabetic rats. Nerves undergoing Wallerian degeneration showed a marked increase in DNA content and stimulated incorporation of [14C]leucine into proteins. 14CO2 production from leucine proceeded at 75% of the rate observed in intact nerves. Neither insulin nor diabetes affected leucine metabolism in degenerating nerves. Neither the extracellular space nor the concentration of free amino acids were significantly different in nerves obtained from control and diabetic rats, except for lower glutamine content in the latter. In vitro leucine metabolism of nerves is affected by diabetes, insulin and the integrity of the axon. The Schwann cell is suggested as a possible site of the observed changes in leucine metabolism.

Original languageEnglish (US)
Pages (from-to)1339-1345
Number of pages7
JournalJournal of Neurochemistry
Volume27
Issue number6
DOIs
StatePublished - Dec 1976
Externally publishedYes

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Wallerian Degeneration
Sciatic Nerve
Medical problems
Metabolism
Leucine
Rats
Insulin
Glucose
Proteins
Schwann Cells
Extracellular Space
Streptozocin
Glutamine
Axons
Cells
Amino Acids
Oxidation

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

Cite this

THE EFFECT OF DIABETES, INSULIN AND WALLERIAN DEGENERATION ON LEUCINE METABOLISM OF ISOLATED RAT SCIATIC NERVES. / Buse, Maria G.; Herlong, H. Franklin; Weigand, Dorothy A.; Spicer, S. S.

In: Journal of Neurochemistry, Vol. 27, No. 6, 12.1976, p. 1339-1345.

Research output: Contribution to journalArticle

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