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Correlation between GAP43 and nerve growth factor receptors in rat sensory neurons

VM Verge, W Tetzlaff, PM Richardson and MA Bisby
Journal of Neuroscience 1 March 1990, 10 (3) 926-934; DOI: https://doi.org/10.1523/JNEUROSCI.10-03-00926.1990
VM Verge
Division of Neurosurgery, Montreal General Hospital, Canada.
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W Tetzlaff
Division of Neurosurgery, Montreal General Hospital, Canada.
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PM Richardson
Division of Neurosurgery, Montreal General Hospital, Canada.
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MA Bisby
Division of Neurosurgery, Montreal General Hospital, Canada.
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Abstract

In mature rat sensory neurons, expression of the gene for the growth- associated protein, GAP43, was studied by in situ hybridization with a cDNA probe. Among neurons in normal lumbar dorsal root ganglia, labeling for GAP43 mRNA was heterogeneous, approximately one-half of the neurons being densely labeled. To characterize the latter population, individual neurons were examined in adjacent sections processed either for GAP43 hybridization or NGF-receptor radioautography. Virtually all neurons with high-affinity NGF binding sites had high basal levels of GAP43 mRNA and most GAP43-positive neurons bore NGF receptors. Another NGF-responsive population, sympathetic neurons in the superior cervical ganglion, also had high basal concentrations of GAP43 mRNA. Further co-localization studies in dorsal root ganglia were performed with immunohistochemistry for somatostatin and enzyme histochemistry for acid phosphatase. The latter 2 groups of sensory neurons have been previously shown to lack high- affinity receptors and were here shown to have low basal concentrations of GAP43 mRNA. From this and earlier studies, it can be assumed that substance P-immunoreactive neurons and strongly positive CGRP neurons synthesize GAP43 at high basal rate. One week following peripheral nerve transection, almost all neurons had high concentrations of GAP43 mRNA without correlation with NGF binding. Intrathecal infusion of NGF after the sciatic nerve was cut did not strongly influence this post- traumatic elevation in GAP mRNA. In normal dorsal root ganglia, neurons that have high-affinity NGF binding sites and are therefore potentially responsive to NGF also have high basal rates of synthesis of GAP43.(ABSTRACT TRUNCATED AT 250 WORDS)

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The Journal of Neuroscience: 10 (3)
Journal of Neuroscience
Vol. 10, Issue 3
1 Mar 1990
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Correlation between GAP43 and nerve growth factor receptors in rat sensory neurons
VM Verge, W Tetzlaff, PM Richardson, MA Bisby
Journal of Neuroscience 1 March 1990, 10 (3) 926-934; DOI: 10.1523/JNEUROSCI.10-03-00926.1990

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Correlation between GAP43 and nerve growth factor receptors in rat sensory neurons
VM Verge, W Tetzlaff, PM Richardson, MA Bisby
Journal of Neuroscience 1 March 1990, 10 (3) 926-934; DOI: 10.1523/JNEUROSCI.10-03-00926.1990
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