TY - JOUR
T1 - Altered NGF protein levels in different brain areas after immunolesion
AU - Yu, J.
AU - Wiley, R. G.
AU - Perez-Polo, R. J.
PY - 1996
Y1 - 1996
N2 - Nerve growth factor (NGF) provides critical trophic support to the cholinergic basal forebrain neurons that express high levels of the low- affinity NGF receptor (p75(NGFR)) in the adult rat brain. Intraventricular injection of 192 IgG-saporin, made by coupling the monoclonal antibody to p75(NGFR) 192 IgG to the cytotoxin saporin, selectively destroys the p75(NGFR)bearing neurons in the basal forebrain and was used here to examine the effects of selective cholinergic lesions on brain NGF protein levels. We showed that 192 IgG-saporin produced significant long-lasting elevation of NGF protein levels in the hippocampus, cortex, and olfactory bulb, with profound reductions of ChAT activities representing complete cholinergic deafferentations of these areas. NGF level was maintained in the basal forebrain, even though there was almost complete loss of p75(NGFR)- immunoreactive cells and significant decrease of ChAT activity. In addition, a mild glial response was observed in the basal forebrain, and most of the activated astroglia expressed NGF-like immunoreactivity there. The increases in NGF protein levels in the target areas of the basal forebrain were most likely due to loss of cholinergic basal forebrain neurons and retrograde transport of NGF from these areas. Glial-derived NGF is partially responsible for the maintained level of NGF in the basal forebrain after the loss of cholinergic neurons. The accumulation of NGF protein in the target areas may have some effects on synaptic rearrangement in denervated tissues.
AB - Nerve growth factor (NGF) provides critical trophic support to the cholinergic basal forebrain neurons that express high levels of the low- affinity NGF receptor (p75(NGFR)) in the adult rat brain. Intraventricular injection of 192 IgG-saporin, made by coupling the monoclonal antibody to p75(NGFR) 192 IgG to the cytotoxin saporin, selectively destroys the p75(NGFR)bearing neurons in the basal forebrain and was used here to examine the effects of selective cholinergic lesions on brain NGF protein levels. We showed that 192 IgG-saporin produced significant long-lasting elevation of NGF protein levels in the hippocampus, cortex, and olfactory bulb, with profound reductions of ChAT activities representing complete cholinergic deafferentations of these areas. NGF level was maintained in the basal forebrain, even though there was almost complete loss of p75(NGFR)- immunoreactive cells and significant decrease of ChAT activity. In addition, a mild glial response was observed in the basal forebrain, and most of the activated astroglia expressed NGF-like immunoreactivity there. The increases in NGF protein levels in the target areas of the basal forebrain were most likely due to loss of cholinergic basal forebrain neurons and retrograde transport of NGF from these areas. Glial-derived NGF is partially responsible for the maintained level of NGF in the basal forebrain after the loss of cholinergic neurons. The accumulation of NGF protein in the target areas may have some effects on synaptic rearrangement in denervated tissues.
KW - 192 IgG-saporin
KW - choline acetyltransferase
KW - glial fibrillary acid protein
KW - immunohistochemistry
KW - p75(NGFR)
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U2 - 10.1002/(SICI)1097-4547(19960115)43:2<213::AID-JNR9>3.0.CO;2-J
DO - 10.1002/(SICI)1097-4547(19960115)43:2<213::AID-JNR9>3.0.CO;2-J
M3 - Article
C2 - 8820969
AN - SCOPUS:0030028931
SN - 0360-4012
VL - 43
SP - 213
EP - 223
JO - Journal of Neuroscience Research
JF - Journal of Neuroscience Research
IS - 2
ER -