Effects of intraventricular transplantation of NGF‐secreting cells on cholinergic basal forebrain neurons after partial immunolesion

Effects of intraventricular transplantation of NGF‐secreting cells on cholinergic basal... The aim of the present study was to examine the effects of nerve growth factor on brain cholinergic function after a partial immunolesion to the rat cholinergic basal forebrain neurons (CBFNs) by 192 IgG‐saporin. Two weeks after intraventricular injections of 1.3 μg of 192 IgG‐saporin, about 50% of CBFNs were lost which was associated with 40–60% reductions of choline acetyltransferase (ChAT) and high‐affinity choline uptake (HACU) activities throughout the basal forebrain cholinergic system. Two groups of lesioned animals received intraventricular transplantations of mouse 3T3 fibroblasts retrovirally transfected with either the rat NGF gene (3T3NGF+) or the retrovirus alone (3T3NGF−) and were sacrificed eight weeks later. In vivo production of NGF by 3T3NGF+ cells was confirmed by NGF immunohistochemistry on the grafts and NGF immunoassay on cerebrospinal fluid (CSF) samples. Both ChAT and HACU activities returned to normal control levels in the basal forebrain and cortex after 3T3NGF+ transplants, whereas no recovery was observed in 3T3NGF− transplanted animals. There was a 25% increase in the size of remaining CBFNs and an increased staining intensity for NGF immunoreactivity in these cells after NGF treatments. Acetylcholinesterase (AChE) histochemistry revealed that the optical density of AChE‐positive fibers in the cerebral cortex and hippocampus were reduced by about 60% in immunolesioned rats which were completely restored by 3T3NGF+ grafts. In addition, decreases in growth‐associated protein (GAP)‐43 immunoreactivity after immunolesion and increases in synaptophysin immunoreactivity after 3T3NGF+ grafts were observed in the hippocampus. Our results further confirm the notion that transfected NGF‐secreting cells are useful in long‐term in vivo NGF treatment and NGF can upregulate CBFN function. They also highly suggest that NGF induces terminal sprouting from remaining CBFNs. © 1996 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neuroscience Research Wiley

Effects of intraventricular transplantation of NGF‐secreting cells on cholinergic basal forebrain neurons after partial immunolesion

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Publisher
Wiley
Copyright
Copyright © 1996 Wiley‐Liss, Inc.
ISSN
0360-4012
eISSN
1097-4547
D.O.I.
10.1002/(SICI)1097-4547(19960701)45:1<40::AID-JNR4>3.0.CO;2-H
Publisher site
See Article on Publisher Site

Abstract

The aim of the present study was to examine the effects of nerve growth factor on brain cholinergic function after a partial immunolesion to the rat cholinergic basal forebrain neurons (CBFNs) by 192 IgG‐saporin. Two weeks after intraventricular injections of 1.3 μg of 192 IgG‐saporin, about 50% of CBFNs were lost which was associated with 40–60% reductions of choline acetyltransferase (ChAT) and high‐affinity choline uptake (HACU) activities throughout the basal forebrain cholinergic system. Two groups of lesioned animals received intraventricular transplantations of mouse 3T3 fibroblasts retrovirally transfected with either the rat NGF gene (3T3NGF+) or the retrovirus alone (3T3NGF−) and were sacrificed eight weeks later. In vivo production of NGF by 3T3NGF+ cells was confirmed by NGF immunohistochemistry on the grafts and NGF immunoassay on cerebrospinal fluid (CSF) samples. Both ChAT and HACU activities returned to normal control levels in the basal forebrain and cortex after 3T3NGF+ transplants, whereas no recovery was observed in 3T3NGF− transplanted animals. There was a 25% increase in the size of remaining CBFNs and an increased staining intensity for NGF immunoreactivity in these cells after NGF treatments. Acetylcholinesterase (AChE) histochemistry revealed that the optical density of AChE‐positive fibers in the cerebral cortex and hippocampus were reduced by about 60% in immunolesioned rats which were completely restored by 3T3NGF+ grafts. In addition, decreases in growth‐associated protein (GAP)‐43 immunoreactivity after immunolesion and increases in synaptophysin immunoreactivity after 3T3NGF+ grafts were observed in the hippocampus. Our results further confirm the notion that transfected NGF‐secreting cells are useful in long‐term in vivo NGF treatment and NGF can upregulate CBFN function. They also highly suggest that NGF induces terminal sprouting from remaining CBFNs. © 1996 Wiley‐Liss, Inc.

Journal

Journal of Neuroscience ResearchWiley

Published: Jul 1, 1996

References

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    Fonnum, Fonnum
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    Roßner, Roßner; Perez‐Polo, Perez‐Polo; Wiley, Wiley; Schliebs, Schliebs; Bigl, Bigl
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    Roßner, Roßner; Schliebs, Schliebs; Perez‐Polor, Perez‐Polor; Wiley, Wiley; Bigl, Bigl
  • Profile of cholinomimetic drugs in primates: status of screens for potential Alzheimer therapies
    Rupniak, Rupniak
  • Changes in cholinergic but not GABAergic markers in amygdala, piriform cortex, and nucleus basalis of the rat brain following systemic administration of kainic acid
    Schliebs, Schliebs; Zivin, Zivin; Steinbach, Steinbach; Rothe, Rothe
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    Takei, Takei; Tsukui, Tsukui; Hatanaka, Hatanaka
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    Westlund, Westlund; Lu, Lu; Kadekaro, Kadekaro; Harmann, Harmann; Terrell, Terrell; Pizzo, Pizzo; Hulsebosch, Hulsebosch; Eisenberg, Eisenberg; Perez‐Polo, Perez‐Polo
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    Yu, Yu; Wiley, Wiley; Perez‐Polo, Perez‐Polo

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