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Atrophy and loss of dopaminergic mesencephalic neurons in heterozygous weaver mice

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Abstract

The phenotypic effect of theweaver mutation in the ventral midbrain of homozygous mutants is associated with the progressive loss of dopaminergic neurons. To discover whether the number of mesencephalic dopaminergic cells is altered in weaver heterozygotes (wv/+), we studied mice between 20 and 365 days of age. We counted tyrosine hydroxylase (TH)-immunopositive cells in the substantia nigra (SN), retrorubral nucleus (RRN), and ventral tegmental area (VTA), and measured cross-sectional areas of neuronal somata in the SN ofwv/+ and age-matched wild-type controls (+/+). The number of TH-positive cells in thewv+ ventral midbrain was on average 13% lower than normal. Cell loss was detected selectively in the SN (12%) and VTA (23%). The areas of somatic profiles in thewv/+ nigral neurons were on average reduced by 9.8%. The neuronal losses in the SN and VTA correlated with a 13.8% reduction in dopamine level in the ventral striatum inwv/+ mice at 14–16 months of age. Our findings imply that a single dose of theweaver gene in the mouse is associated with cellular damage leading to a chronic deficiency in the mesostriatal dopaminergic system.

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Authors and Affiliations

  1. Department of Pathology and Laboratory Medicine Division of Neuropathology, Indiana University School of Medicine, 635 Barnhill Drive, 46202-5120, Indianapolis, IN, USA

    Tatyana Verina, Lazaros C. Triarhou & Bernardino Ghetti

  2. Department of Psychiatry, Institute of Psychiatric Research, Indiana University School of Medicine, 46202, Indianapolis, IN, USA

    James A. Norton, Judith A. Richter, Jay R. Simon & Bernardino Ghetti

  3. Department of Medical and Molecular Genetics, Indiana University School of Medicine, 46202, Indianapolis, IN, USA

    James A. Norton, Jeffrey J. Sorbel & Bernardino Ghetti

  4. Department of Pharmacology and Toxicology, Indiana University School of Medicine, 46202, Indianapolis, IN, USA

    Judith A. Richter

  5. Department of Molecular Biology and Biochemistry, Indiana University School of Medicine, 46202, Indianapolis, IN, USA

    Jay R. Simon

  6. Imaging Systems Group, Leica Inc., 60015, Deerfield, IL, USA

    Donald Laferty

Authors
  1. Tatyana Verina
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  2. James A. Norton
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  3. Jeffrey J. Sorbel
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  4. Lazaros C. Triarhou
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  5. Donald Laferty
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  6. Judith A. Richter
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  7. Jay R. Simon
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  8. Bernardino Ghetti
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This study is dedicated to the memory of the late Professor James A. Norton, Jr (1921–1996) by the coauthors.

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Verina, T., Norton, J.A., Sorbel, J.J. et al. Atrophy and loss of dopaminergic mesencephalic neurons in heterozygous weaver mice. Exp Brain Res 113, 5–12 (1997). https://doi.org/10.1007/BF02454137

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  • DOI: https://doi.org/10.1007/BF02454137

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