Expression of the Somatostatin Subtype 2A Receptor in the Rabbit Retina

Overview

Journal J Comp Neurol

Specialty Neurology

Date 1998 Mar 31

PMID 9520104

Citations 7

Authors

J Johnson

H Wong

J H Walsh

N C Brecha

Affiliations

Soon will be listed here.

Abstract

In the retina, somatostatin influences neuronal activity likely by acting at one or more somatostatin subtype (sst) receptors. Somatostatin and somatostatin-binding sites are distributed predominantly to the inner retina. The present study has investigated the cellular expression of one of the sst receptors, the sst2A receptor isoform, in the rabbit retina. These studies have used a new polyclonal antibody directed to the predicted C-terminus of mouse sst2A(361-369) receptor. Antibody specificity was tested by preadsorption of the primary antibody with a peptide corresponding to sst2A(361-369). sst2A Receptor immunoreactivity was localized mainly to the plasma membrane of rod bipolar cells and to sparsely occurring, wide-field amacrine cells. Immunostaining in rod bipolar cells was strongest in the axon and axon terminals in lamina 5 of the inner plexiform layer (IPL) and was weakest in the cell body and dendrites. Double-labeling experiments using a monoclonal antibody against protein kinase C (PKC; alpha and beta), a rod bipolar cell-selective marker, showed complete colocalization. In horizontal sections of retina, immunostained bipolar cell bodies had a dense distribution, which is in agreement with the reported distribution of rod bipolar cell bodies. Immunoreactive amacrine cell bodies were located at the border of the inner nuclear layer and the IPL, and thin varicose processes ramified mainly in laminae 2 and 4 of the IPL. These observations indicate that somatostatin influences visual information processing in the retina 1) by acting presynaptically on rod bipolar cell axon terminals and b) by influencing the activity of sparsely occurring amacrine cells.

Citing Articles

Molecular and Cellular Mechanisms Underlying Somatostatin-Based Signaling in Two Model Neural Networks, the Retina and the Hippocampus.

Cammalleri M, Bagnoli P, Bigiani A Int J Mol Sci. 2019; 20(10).

PMID: 31117258 PMC: 6566141. DOI: 10.3390/ijms20102506.

Parallel Inhibition of Dopamine Amacrine Cells and Intrinsically Photosensitive Retinal Ganglion Cells in a Non-Image-Forming Visual Circuit of the Mouse Retina.

Vuong H, Hardi C, Barnes S, Brecha N J Neurosci. 2015; 35(48):15955-70.

PMID: 26631476 PMC: 4666919. DOI: 10.1523/JNEUROSCI.3382-15.2015.

The Neuropeptide Systems and their Potential Role in the Treatment of Mammalian Retinal Ischemia: A Developing Story.

Cervia D, Casini G Curr Neuropharmacol. 2013; 11(1):95-101.

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Synaptic transmission at retinal ribbon synapses.

Heidelberger R, Thoreson W, Witkovsky P Prog Retin Eye Res. 2005; 24(6):682-720.

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Effect of somatostatin analogues on chemically induced ischaemia in the rat retina.

Mastrodimou N, Lambrou G, Thermos K Naunyn Schmiedebergs Arch Pharmacol. 2005; 371(1):44-53.

PMID: 15645293 DOI: 10.1007/s00210-004-1011-9.

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