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Tränenabfluss

Bedeutung von Muzinen und TFF-Peptiden

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Zusammenfassung

Im Epithel von Tränensack und Tränennasengang kommen außer Basalzellen und hochprismatischen Epithelzellen in großer Menge Becherzellen vor. Ein Hauptsektretionsprodukt der Epithelzellen sind Muzine und TFF-Peptide. Untersuchungen zeigen im Epithel von Tränensack und Tränennasengang, dass die Muzine MUC2, MUC5AC und MUC5B zusammen mit TFF1 von Becherzellen und intraepithelialen Drüsen gebildet werden. Das Muzin MUC7 wird zusammen mit TFF3 von hochprismatischen Epithelzellen gebildet. Bei Patienten mit funktioneller Dakryostenose kommt es zu einer Herabregulation sekretorischer Muzine. Der Nachweis eines breiten Muzinspektrums im Epithel der ableitenden Tränenwege und die Herabregulation sekretorischer Muzine bei der funktionellen Dakryostenose, die mit Epiphora einhergeht, stützt die Annahme, dass Muzine einen wichtigen Faktor für den Tränentransport darstellen. Störungen im Gleichgewicht einzelner Muzine können für die Ausbildung von Dakryostenosen, Dakryozystitiden und Dakryolithen von Bedeutung sein. Die Ergebnisse eröffnen bisher bestehenden Therapiekonzepten bei Erkrankungen des Tränenableitungssystems neue Perspektiven.

Abstract

The epithelial lining of the lacrimal sac and the nasolacrimal duct consists of pseudo-stratified, columnar epithelia rich in goblet cells. Major secretory products of the epithelial cells are mucins together with TFF peptides. Expression and distribution of several mucins and TFF peptides in the human efferent tear ducts was investigated by means of reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemistry. mRNAs for all the mucins investigated, MUC1, MUC2, MUC4, MUC5AC, MUC5B and MUC7, were detected in healthy human lacrimal sacs and nasolacrimal ducts. Both MUC5AC and MUC5B were detected in goblet cells forming intraepithelial mucous glands. MUC7 together with TFF3 occurred only in columnar epithelial cells of the efferent tear duct system. The mucin diversity of the efferent tear ducts could enhance tear transport and antimicrobial defense. The absence of some mucins in non-functioning although patent segments of the lacrimal passage, suggests that mucins ease tear flow through the efferent tear ducts because these conditions are associated with epiphora. Disorders in the balance of single mucins could be of importance with regard to dacryostenosis, dacryocystitis and dacryolith formation.

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Danksagung

Die Arbeiten wurden von der Deutschen Forschungsgemeinschaft (Pa738/1–2 und 1–3 an F.P.), dem National Eye Research Center (NERC grant 2000/013 an M.B.), dem Fond der Chemischen Industrie (0163615 sowie 0500058 an W.H.) und der AG Trockenes Auge im BVA unterstützt.

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Correspondence to F. Paulsen.

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Teile der Untersuchungsergebnisse wurden als Kurzvortrag auf der 100. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft 2002 vorgestellt.

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Paulsen, F., Corfield, A., Hinz, M. et al. Tränenabfluss. Ophthalmologe 101, 19–24 (2004). https://doi.org/10.1007/s00347-003-0842-y

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