Immunohistochemical localization of the somatostatin SST2(A) receptor in the rat brain and spinal cord

Neuroscience
M SchindlerP C Emson

Abstract

The neuropeptide somatostatin is widely distributed in the CNS and is believed to play a role as a neurotransmitter or a neuromodulator. Somatostatin mediates its actions by the binding of the peptide to high affinity membrane receptors. The genes for five somatostatin receptor types have been cloned recently and Northern blotting and in situ hybridization studies have shown that the transcripts of all five types are expressed in the CNS. Here we report the cellular distribution of somatostatin sst2(a) receptor protein in the adult rat CNS, using a polyclonal anti-peptide antibody directed against a portion of the C-terminal domain of the receptor. The specificity of the affinity-purified antibody was demonstrated by Western blotting and immunolabelling of cells transfected with a hemagglutinin epitope-tagged version of the sst2(a) receptor. Immunohistochemistry showed a distinct distribution of the receptor protein in the rat brain. Cells and processes were labelled in a number of areas, including the basolateral amygdala, the locus coeruleus, the endopiriform nucleus, the deep layers of the cerebral cortex, the subiculum, the claustrum, the habenula, the interpenduncular nucleus, the hippocampus and the central grey. In the s...Continue Reading

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