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Short Communications |
-, ß-, and
-Synuclein Neuropathology





From the Department of Neurology,*
Medical College of
Pennsylvania Hahnemann University; the Department of Pathology
and Laboratory Medicine,
the
Center for Neurodegenerative Disease Research, and the
Department of Neurology,
the University of
Pennsylvania, Philadelphia, Pennsylvania
Neurodegeneration with brain iron accumulation, type 1
(NBIA 1), or Hallervorden-Spatz syndrome, is a rare
neurodegenerative disorder characterized clinically by
Parkinsonism, cognitive impairment, pseudobulbar
features, as well as cerebellar ataxia, and
neuropathologically by neuronal loss, gliosis, and iron
deposition in the globus pallidus, red nucleus, and
substantia nigra. The hallmark pathological lesions of NBIA 1 are
axonal spheroids, but Lewy body (LB)-like intraneuronal
inclusions, glial inclusions, and rare neurofibrillary
tangles also occur. Here we show that there is an accumulation of
-synuclein (
S) in LB-like inclusions, glial
inclusions, and spheroids in the brains of three NBIA 1
patients. Further, ß-synuclein (ßS) and
-synuclein
(
S) immunoreactivity was detected in spheroids but not in LB-like or
glial inclusions. Western blot analysis demonstrated high-molecular
weight
S aggregates in the high-salt-soluble and Triton
X-100-insoluble/sodium dodecyl sulfate-soluble fraction of the NBIA 1
brain. Significantly, the levels of
S were markedly reduced
in the Triton X-100-soluble fractions compared to control
brain, and unlike other synucleinopathies, insoluble
S did not accumulate in the formic acid-soluble fraction. These
findings expand the concept of neurodegenerative synucleinopathies by
implicating
S, ßS, and
S in the pathogenesis of
NBIA 1.
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