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  • 1980-1984  (3)
  • 1
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The chronic effects of kainate-induced lesions of the neostriatum have been evaluated in rats 12 months following the injection of kainic acid. Light microscopical analysis revealed marked disappearance of nerve cells in the neostriatum, with some cells remaining within the medial and lateral zone of the neostriatum and in the most ventral part. The rest of the markedly atrophied neostriatum was mainly made up of densely packed myelinated nerve bundles. Tyrosine hydroxylase immunoreactivity was used as a marker for dopamine neurons and revealed that tyrosine hydroxylase immunoreactive nerve terminals remained between the axon bundles in the striatum and that tyrosine hydroxylase immunoreactive nerve cell bodies in the substantia nigra seemed intact. Studies on enkephalin immunoreactive neurons revealed a marked disappearance of such nerve cells and nerve terminals within the neostriatum. Neurochemical analysis showed a clearcut reduction in the number of dopamine receptors as evaluated by studies on both [3H]spiperone binding and on [3H]ADTN binding. Dopamine levels remained unchanged while choline acetyltransferase activity was reduced significantly. Taken together, the present findings demonstrate that the chronically kainate lesioned striatum is characterized by a substantial loss of enkephalin immunoreactive and cholinergic nerve cells and a marked reduction in the number of dopamine receptors. These findings are discussed in relation to neurochemical and therapeutic aspects of Huntington's disease.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 94-95 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] After anaesthesia with Nembutal (60 mg per kg, intraperi-toneally (i.p.)), male Sprague-Dawley rats (200 g) were positioned in a David Kopf small animal stereotaxic apparatus and kainic acid (1 |xg in 0.5 ,? phosphate-buffered saline (PBS), pH 7.4) was infused unilaterally into the neostriatum ...
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4935
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The hypothesis is introduced that miniaturization of neuronal circuits in the central nervous system and the hierarchical organization of the various levels, where information handling can take place, may be the key to understand the enormous capability of the human brain to store engrams as well as its astonishing capacity to reconstruct and organize engrams and thus to perform highly sophisticated integrations. The concept is also proposed that in order to understand the relationship between the structural and functional plasticity of the central nervous system it is necessary to postulate the existence of memory storage at the network level, at the local circuit level, at the synaptic level, at the membrane level, and finally at the moIecular level. Thus, memory organization is similar to the hierarchical organization of the various levels, where information handling takes place in the nervous system. In addition, each higher level plays a role in the reconstruction and organization of the engrams stored at lower levels. Thus, the trace of the functionally stored memory (i.e. its reconstruction and organization at various levels of storage) will depend not only on the chemicophysical changes in the membranes of the local circuits but also on the organization of the local circuits themselves and their associated neuronal networks.
    Type of Medium: Electronic Resource
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