Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine.

Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Research Abstract Details 

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Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Abstract Text:

C de Montigny,M Weiss,J Ouellette,

Rats were injected unilaterally with colchicine in the dentate gyrus of the dorsal hippocampus. Two weeks later, under urethane anesthesia, extracellular recordings were obtained on both sides from pyramidal neurons of the CA1 and of the CA3 regions of the dorsal hippocampus. Microiontophoresis was used to assess the responsiveness of these neurons to kainate, glutamate and ibotenate. The colchicine injection produced a nearly complete destruction of the granule cells of the ipsilateral dentate gyrus and of their mossy fiber projections to CA3 without apparently affecting other hippocampal neurons. On the lesioned side, the potency of kainate in activating CA3 pyramidal neurons was reduced by 94% compared to the same neurons on the intact side. However, the excitatory effect of glutamate was unchanged and that of ibotenate only slightly reduced. Kainate was 80 times more potent in activating CA3 than CA1 pyramidal neurons on the intact side, whereas this ratio had dropped to 2.6 on the lesioned side. The selective decrease of the effectiveness of kainate in activating CA3 pyramidal neurons following the colchicine lesion suggests that this amino acid, but not glutamate and ibotenate, produces most of its excitatory effect in the intact CA3 region by releasing (an) excitatory neurotransmitter(s) from mossy fibers terminals, the nature of which remains to be identified.

Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Publishing Authors By Initials

C de Montigny,M Weiss,J Ouellette,

For similar synaptic transmission research abstracts see: synaptic transmission research

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Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 65

Page Numbers: 605-13

Journal Abbreviation:

ISSN: 0014-4819

DAY: 15

MONTH: 02

YEAR: 1987

Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Keywords Mesh Terms:

KEYWORDS: Synaptic Transmission

MESH TERMS: drug effects

Chemical & Substance for Abstract: Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine. Information

Substance Name: Colchicine

Registry Number: 64-86-8

Grant and Affiliation Information for Reduced excitatory effect of kainic acid on rat CA3 hippocampal pyramidal neurons following destruction of the mossy projection with colchicine.

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Country: GERMANY, WEST

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MEDLINETA: Exp Brain Res

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