ArticleGraefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie2018
Detection of intrinsic cholinergic system in the human lacrimal drainage system: evidence and potential implications.
Article in Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed, 14 citations in OpenAlex.
- "ThermoTRP" Channel Expression in Cancers: Implications for Diagnosis and Prognosis (Practical Approach by a Pathologist).International journal of molecular sciences · 2023Review
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Authors and funding
5 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeTo investigate the presence and distribution of epithelial and non-epithelial cholinergic system and cholinergic brush cells in the human lacrimal drainage system.
methodsThe study was performed on fresh frozen human cadaveric samples of the lacrimal drainage system. Immunohistochemistry was performed for assessing the presence and distribution of cholinergic brush cell proteins-villin, acetylcholine synthesizing enzyme, choline acetyltransferase (ChAT); vesicular acetylcholine transporter (VAChT); components of canonical taste transduction signaling cascade, phospholipase C β2 (PLCβ2), and transient receptor potential cation channel, subfamily M, and member 5 (TRPM5). In addition, immunoreactivity to carbonic anhydrase 4 (CA4) was assessed. The immunoreactivity was scored as positive or negative and the distribution patterns in the canaliculi, lacrimal sac, and nasolacrimal duct were investigated. In addition, ultrastructural analysis was performed to ascertain the presence of brush cells by means of scanning electron microscopy (SEM).
resultsVillin revealed immunoreactivity in the superficial epithelial cells of lacrimal sac and nasolacrimal ducts. Positive immunoreactivity was also found for ChAT, VAChT, TRPM5, and PLCβ2. ChAT expression was limited to the superficial epithelial layers of the lacrimal sac epithelium. TRPM5 and PLCβ2 were expressed on the cell membranes, cytoplasm, and basolateral surfaces of the lacrimal sac epithelium and also showed strong expression in the submucosal glandular acinar cells. VAChT showed strong expression in the canaliculus and lacrimal sac and was expressed on the surface of the superficial epithelial cells and the submucosal glandular acinar cells and lining of the blood vessels. There was a uniformly negative immunoreactivity for CA4. SEM revealed single epithelial cells with dense tuft of rigid apical microvilli in the lacrimal sac and nasolacrimal ducts.
conclusionsThis study provides a proof of principle for the presence of an intrinsic epithelial cholinergic mechanism in the lacrimal drainage system.
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