AMPA-induced lesions of the basal forebrain differentially affect cholinergic and non-cholinergic neurons: lesion assessment using quantitative in situ hybridization histochemistry

The European Journal of Neuroscience
K J PageB J Everitt

Abstract

The direct and transynaptic effects of lesions of the basal forebrain induced by alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) and ibotenic acid were investigated using quantitative in situ hybridization histochemistry. Probes complementary to the sequences of choline acetyltransferase mRNA, glutamate decarboxylase mRNA and preproenkephalin mRNA were used to assess direct lesion effects within the basal forebrain and probes for postsynaptic M-1 and M-3 muscarinic receptors were used to assess long-term changes in neocortical muscarinic receptor mRNA expression following cholinergic deafferentation. AMPA-induced basal forebrain lesions destroyed significantly more neurons that expressed choline acetyltransferase mRNA than ibotenic acid-induced lesions (90 versus 60%), but significantly fewer neurons which expressed either glutamate decarboxylase or preproenkephalin mRNA (61 versus 83% reduction in glutamate decarboxylase mRNA and 56 versus 79% reduction in preproenkephalin mRNA). AMPA-induced lesions did, however, destroy a significant proportion of the neurons which expressed glutamate decarboxylase and preproenkephalin mRNA (approximately 60%). The neurons spared following AMPA-induced lesions were typically...Continue Reading

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Mar 1, 1997·Behavioural Brain Research·B Givens, M Sarter
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