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Effect of Stimulation on the Incorporation of 14 C from Glial and Neuronal Specific Substrates into Brain Proteins In Vivo and In Vitro
Author(s) -
AbdulGhani A.S.,
Boyar M. M.,
CoutinhoNetto J.,
Bradford H. F.
Publication year - 1980
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1980.tb12503.x
Subject(s) - stimulation , in vivo , amino acid , in vitro , chemistry , tetrodotoxin , phenylalanine , intraperitoneal injection , cortex (anatomy) , cerebral cortex , medicine , leucine , endocrinology , biochemistry , biology , neuroscience , microbiology and biotechnology
The incorporation of amino acids into brain proteins following brachial plexus stimulation (BPS) was studied in anaesthetised Sprague‐Dawley rats following injection of radioactive precursors of both neuronal and glial compartments. Following intraperitoneal injection of [ 14 C]glucose, which is the major neuronal pool precursor, BPS resulted in a significant increase of 379% ( P ± 0.001) in the incorporation of carbon from [ 14 C]glucose into TCA‐insoluble proteins in the contralateral sensorimotor cortex as compared with the ipsilateral area of the same animal. This increase was abolished totally when tetrodotoxin (10 μg ml ‐1 ) was applied topically to the surface of the stimulated area. Following intraperitoneal injection of [ 14 C]acetate, which is considered to be mainly a glial cell precursor, the same afferent electrical stimuli caused a significant decrease of 21% in the incorporation of amino acids into proteins in the stimulated versus unstimulated sensorimotor cortex. With [4‐ 3 H]phenyl‐alanine or [l‐ 14 C]leucine as precursors a significant decrease (12%) or no change was recorded, respectively. A similar decrease in protein synthesis in the stimulated sensorimotor cortex was achieved using different routes of injection. No significant changes were observed in the ratio of the specific radioactivities of the total amino acids of the two hemispheres using either precursor. In vitro , synaptosomes showed a large increase in incorporation into proteins after treatment with electrical pulses, both with [ 14 C]glucose and with [U‐ 14 C]acetate as precursors.