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Journal of Neuroscience, Vol 14, 985-998, Copyright © 1994 by Society for Neuroscience
Expression of mRNAs encoding ARPP-16/19, ARPP-21, and DARPP-32 in human brain tissue
S Brene, N Lindefors, M Ehrlich, T Taubes, A Horiuchi, J Kopp, H Hall, G Sedvall, P Greengard and H Persson
Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.
In this study we have isolated and sequenced human cDNAs for the
phosphoproteins DARPP-32, ARPP-21, and ARPP-16/19, and have compared these
sequences to previously characterized bovine and rat cDNAs. In situ
hybridization and Northern blot analysis with the human cDNA probes were
used to study the expression of mRNAs encoding ARPP-16/19, ARPP-21, and
DARPP-32 in human postmortem brain tissue. In situ hybridization was
performed using horizontal whole hemisphere sections. Five representative
levels of the brain ranging from 71 mm to 104 mm ventral to vertex were
examined. All three probes showed distinct hybridization patterns in the
caudate nucleus, putamen, nucleus accumbens, and the amygdaloid complex.
For ARPP-16/19 mRNA, a hybridization signal comparable to the signal in
caudate nucleus, putamen, and nucleus accumbens was also detected in the
neocortex. ARPP- 21 and DARPP-32 mRNA, on the other hand, were present in
lower levels in neocortical regions. DARPP-32 mRNA was abundant in the
cerebellar cortex at the level of the Purkinje cell layer. High levels of
ARPP- 16/19 and ARPP-21 mRNA were also found in the cerebellar cortex,
where they were confined to deeper layers. The present result demonstrate
that mRNAs for the three phosphoproteins are expressed in overlapping, but
also distinct, areas of the human brain that in many cases coincide with
previously described distribution of the dopamine D1 receptor.
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