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Volume 17, Number 9,
Issue of May 1, 1997
pp. 3052-3063
Copyright ©1997 Society for Neuroscience
Heterogeneous Topographic and Cellular Distribution of Huntingtin
Expression in the Normal Human Neostriatum
Received Nov. 25, 1996; revised Feb. 12, 1997; accepted Feb. 14, 1997.
Robert J. Ferrante1,
Claire-Anne Gutekunst2,
Francesca Persichetti3,
Sandra M. McNeil3,
Neil W. Kowall1,
James F. Gusella3,
Marcy E. MacDonald3,
M. Flint Beal4, and
Steven M. Hersch2
1 Geriatric Research Education Clinical Center, Bedford
VA Medical Center, Bedford, Massachusetts 01730, and Neurology
Department, Boston University School of Medicine, Boston, Massachusetts
02118, 2 Department of Neurology, Emory University School
of Medicine, Atlanta, Georgia 30322, 3 Molecular
Neurogenetics Unit, Massachusetts General Hospital, Charlestown,
Massachusetts 02129, and 4 Neurochemistry Laboratory,
Neurology Service, Massachusetts General Hospital and Harvard Medical
School, Boston, Massachusetts 02114
A striking heterogeneous distribution of topographic and cellular
huntingtin immunoreactivity was observed within the human neostriatum
using three distinct huntingtin antibodies. Patchy areas of low
huntingtin immunoreactivity were present in both the caudate nucleus
and putamen, surrounded by an intervening area of greater
immunoreactivity. Comparison of huntingtin immunoreactivity with
contiguous serial sections stained for enkephalin and calbindin D28k
immunoreactivities showed that the topographic heterogeneity of
huntingtin immunostaining corresponded to the patch (striosome) and
matrix compartments within the striatum. Huntingtin immunoreactivity was confined primarily to neurons and neuropil within the matrix compartment, whereas little or no neuronal or neuropil huntingtin immunostaining was observed within the patch compartment. There was
marked variability in the intensity of huntingtin immunolabel among
medium-sized striatal neurons, whereas a majority of large striatal
neurons were only faintly positive or without any immunoreactivity. Combined techniques for NADPH-diaphorase enzyme histochemistry and
huntingtin immunocytochemistry, as well as double immunofluorescence for either nitric oxide synthase or calbindin D28k in comparison with
huntingtin expression, revealed a striking correspondence between
calbindin D28k and huntingtin immunoreactivities, with little or no
colocalization between NADPH-diaphorase or nitric oxide synthase
neurons and huntingtin expression. These observations suggest that the
selective vulnerability of spiny striatal neurons and the matrix
compartment observed in Huntington's disease is associated with higher
levels of huntingtin expression, whereas the relative resistance of
large and medium-sized aspiny neurons and the patch compartments to
degeneration is associated with low levels of huntingtin
expression.
Key words:
Huntington's disease;
huntingtin;
neostriatum;
immunofluorescence;
NADPH-diaphorase;
nitric oxide synthase;
calbindin
D28k
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