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Forschungsdatenbank PMU-SQQUID

Characterization of dsRed2-positive cells in the doublecortin-dsRed2 transgenic adult rat retina.
Trost, A; Schroedl, F; Marschallinger, J; Rivera, FJ; Bogner, B; Runge, C; Couillard-Despres, S; Aigner, L; Reitsamer, HA;
Histochem Cell Biol. 2014; 142(6):60-17
Originalarbeiten (Zeitschrift)


Aigner Ludwig
Bogner Barbara
Couillard-Després Sébastien
Marschallinger Julia
Reitsamer Herbert
Rivera Gomez-Barris Francisco J.
Runge Christian
Schrödl Falk
Zurl Andrea


Extrinsic and intrinsic sources of the autonomic nervous system contribute to choroidal innervation, thus being responsible for the control of choroidal blood flow, aqueous humor production or intraocular pressure. Neuropeptides are involved in this autonomic control, and amongst those, alarin has been recently introduced. While alarin is present in intrinsic choroidal neurons, it is not clear if these are the only source of neuronal alarin in the choroid. Therefore, we here screened for the presence of alarin in human cranial autonomic ganglia, and also in rat, a species lacking intrinsic choroidal innervation. Cranial autonomic ganglia (i.e., ciliary, CIL; pterygopalatine, PPG; superior cervical, SCG; trigeminal ganglion, TRI) of human and rat were prepared for immunohistochemistry against murine and human alarin, respectively. Additionally, double staining experiments for alarin and choline acetyltransferase (ChAT), tyrosine hydroxilase (TH), substance P (SP) were performed in human and rat ganglia for unequivocal identification of ganglia. For documentation, confocal laser scanning microscopy was used, while quantitative RT-PCR was applied to confirm immunohistochemical data and to detect alarin mRNA expression. In humans, alarin-like immunoreactivity (alarin-LI) was detected in intrinsic neurons and nerve fibers of the choroidal stroma, but was lacking in CIL, PPG, SCG and TRI. In rat, alarin-LI was detected in only a minority of cranial autonomic ganglia (CIL: 3.5%; PPG: 0.4%; SCG: 1.9%; TRI: 1%). qRT-PCR confirmed the low expression level of alarin mRNA in rat ganglia. Since alarin-LI was absent in human cranial autonomic ganglia, and only present in few neurons of rat cranial autonomic ganglia, we consider it of low impact in extrinsic ocular innervation in those species. Nevertheless, it seems important for intrinsic choroidal innervation in humans, where it could serve as intrinsic choroidal marker. Copyright © 2014 Elsevier Ltd. All rights reserved.

Useful keywords (using NLM MeSH Indexing)




Luminescent Proteins/genetics*

Luminescent Proteins/metabolism


Microtubule-Associated Proteins/genetics*

Microtubule-Associated Proteins/metabolism




Rats, Transgenic


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