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Journal of Neuroscience, Vol 7, 3935-3944, Copyright © 1987 by Society for Neuroscience
The neostriatal mosaic: III. Biochemical and developmental dissociation of patch-matrix mesostriatal systems
CR Gerfen, KG Baimbridge and J Thibault
Laboratory of Neurophysiology, National Institute of Mental Health, Bethesda, Maryland 20892.
In the previous paper (Gerfen et al., 1987) mesostriatal dopaminergic
neurons were shown to be subdivided into dorsal and ventral tiers that
project to the striatal matrix and patch compartments, respectively. The
present study provides experimental evidence that these patch- matrix
mesostriatal dopaminergic systems are biochemically and developmentally
distinct. A 28 kDa calcium-binding protein (CaBP, or calbindin-D28 kDa) is
expressed in dorsal tier mesostriatal dopaminergic neurons. The
distribution of such neurons, located in the ventral tegmental area, dorsal
tier of the substantia nigra pars compacta, and retrorubral area, matches
that of dopaminergic neurons that project to the striatal matrix.
Dopaminergic neurons that do not express CaBP--those in the ventral tier of
the pars compacta and in the pars reticulata--are distributed in a pattern
that matches the origin of the dopaminergic projection to the striatal
patches. During development, dopaminergic afferents to the striatal patch
compartment are in place prior to the development of those to the matrix.
Injections of the neurotoxin 6-hydroxydopamine (6-OHDA) into the striatum
of newborn rats result in a selective and long-lasting depletion of
dopaminergic afferents in the striatal patches. The later- developing
matrix projection is relatively spared by such lesions. The distribution of
surviving dopaminergic neurons, labeled with tyrosine hydroxylase (TH)
immunoreactivity, matches the pattern of dorsal tier neurons previously
shown to provide inputs to the matrix. Surviving neurons also express CaBP
immunoreactivity and have dendrites that spread mediolaterally, in the
plane of the pars compacta. On the other hand, those neurons that project
to the patches are selectively lesioned by the neonatal 6-OHDA striatal
injections, do not express CaBP, and have dendrites that are directed
ventrally into the pars reticulata.
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