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Patterns of cell and fiber vulnerability in the mesostriatal system of the mutant mouse weaver. I. Gradients and compartments

AM Graybiel, K Ohta and S Roffler-Tarlov
Journal of Neuroscience 1 March 1990, 10 (3) 720-733; DOI: https://doi.org/10.1523/JNEUROSCI.10-03-00720.1990
AM Graybiel
Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139.
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K Ohta
Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139.
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S Roffler-Tarlov
Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139.
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Abstract

In mice carrying the autosomal recessive gene weaver, there is a massive postnatal loss of dopamine in the caudoputamen, the target of the nigrostriatal system, with relative (though not complete) preservation of dopamine in the ventral striatum, a target of the mesolimbic system. There is concomitant death of catecholaminergic neurons in the substantia nigra, with much less cell death in the limbic midbrain area. In the study reported here, we have reexamined the mesostriatal system of weaver mice by means of tyrosine hydroxylase (TH) immunohistochemistry in order to determine the local architecture of the defect within the striatum and substantia nigra. For the dorsal striatum, the most striking finding was the appearance in the weaver caudoputamen of small pockets of especially weak immunostaining within a larger dorsal zone of generally reduced TH-positive neuropil. These pockets were identified as striosomes by calbindin28k and met- enkephalin immunohistochemistry carried out on adjacent sections. In dorsal, central, and caudal sectors of the caudoputamen, there was also more generalized depletion of TH-immunoreactive neuropil. In the mid- brains of the mutants, the patterns of loss of TH-positive neurons appeared to correspond to these distributions of reduced immunostaining in the striatum. In the substantia nigra pars compacta, ventrally situated TH-positive neurons were especially affected, suggesting preferential depletion of TH-positive neurons projecting to striosomes. In addition, there was a central sector of nearly complete loss of TH- positive neurons in the substantia nigra para compacta and a marked depletion of TH-positive neurons in cell group A8 that, together, may have accounted for the diminution of TH-positive innervation of the striatal matrix. We conclude that the effects of the weaver gene discriminate among mesostriatal subsystems not only according to the regional affiliations of these subsystems within the dorsal and ventral striatum, but also according to the preferential association of the subsystems for the striosomal and matrical compartments of the caudoputamen. The depletion of TH-positive innervation was not confined to the dorsal striatum proper. The defect extended into the adjoining nucleus accumbens, where it appeared to affect the lateral “core” division, and included also a lateral part of the olfactory tubercle. Thus, as in the dorsal striatum, the defect in the TH-positive innervation of the ventral striatum closely follows the local architecture of this striatal region. Neuronal loss in the ventral tegmental area was not evident on qualitative analysis, but at the border between lateral cell group A 10 and medial cell group A9 there was obvious loss of immunostained neurons.(ABSTRACT TRUNCATED AT 400 WORDS)

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The Journal of Neuroscience: 10 (3)
Journal of Neuroscience
Vol. 10, Issue 3
1 Mar 1990
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Patterns of cell and fiber vulnerability in the mesostriatal system of the mutant mouse weaver. I. Gradients and compartments
AM Graybiel, K Ohta, S Roffler-Tarlov
Journal of Neuroscience 1 March 1990, 10 (3) 720-733; DOI: 10.1523/JNEUROSCI.10-03-00720.1990

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Patterns of cell and fiber vulnerability in the mesostriatal system of the mutant mouse weaver. I. Gradients and compartments
AM Graybiel, K Ohta, S Roffler-Tarlov
Journal of Neuroscience 1 March 1990, 10 (3) 720-733; DOI: 10.1523/JNEUROSCI.10-03-00720.1990
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