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Histochemische Untersuchungen über das Verhalten der sauren Mukopolysaccharide bei Wundheilung der lamellierenden Keratoplastik

Histochemical investigation of acid mucopolysaccharides in corneal wound healing of lamellar corneal graft

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Abstract

Histochemical investigations were carried out in a series of toluidine blue preparations of pH 3.8–5.2 of unfixed frozen corneal sections of lamellar keratoplasties in rabbit eyes to show alterations in the pattern of acid mucopolysaccharides during wound healing. The metachromasia in lamellar auto- and homokeratoplasties is mainly reduced in the region of the vertical hostgraft junction. When using virgin silk the zone of reduced metachromasia in the vertical junction is broader compared with a 9/0-Nylon suture. The metachromasia of the lamellar transplant becomes normal in autokeratoplasties (Table 1) after a fortnight and in homokeratoplasties after 3 weeks; otherwise the metachromasia during the wound healing shows no significant difference in auto- and homokeratoplasties. The normal pattern of mucopolysaccharides in the corneal stroma does not return in the vertical host-graft junction, but this scar becomes smaller over a period of time (Fig. 3, 4, 5). There are no significant alterations of metachromasia found in the horizontal host-graft junction during wound healing between 1 day and 6 months, but starting from the 7th day after the lamellar keratoplasty using PAS-stain a small more PAS-intensive coloured line in the horizontal host-graft junction which is still there 6 months after the operation (Fig. 1, 2). When the 9/0 Nylon suture remains for 3 months, corneal vascularisation develops predominantly in the horizontal junction between host and lamellar graft. The graft becomes cloudy and the metachromasia remains reduced as long as 9 months after the suture has been removed (Table 2).

Zusammenfassung

Es wurden histochemische Untersuchungen über Veränderungen der sauren Mukopolysaccharide bei lamellierenden Keratoplastiken am Kaninchenauge durchgeführt mit der Toluidinblau-Metachromasie an unfixierten Gefrierschnitten in einer aufsteigenden pH-Reihe von 3,8 bis 5,2. Während sich die metachromatische Reaktion im Transplantat bei Autokeratoplastiken nach 14 Tagen und bei Homokeratoplastiken nach 21 Tagen normalisiert hat, kommt es im seitlichen Narbengebiet zwischen Transplantat und Empfängerhornhaut zu einer bleibenden Verminderung der Metachromasie. Im unteren waagerechten Wund- beziehungsweise Narbengebiet zeigen sich während der Wundheilungsvorgänge in einem Zeitraum zwischen 1 Tag und 6 Monaten keine auffälligen Veränderungen der Metachromasie. Bei längerer Verweildauer der Nylonfäden kommt es zu einer dauernden Verminderung der metachromatischen Reaktion im lamellären Transplantat.

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Gekürzte Darstellung der vom Fachbereich Humanmedizin der Johann Wolfgang Goethe-Universität Frankfurt am Main am 7.10.76 angenommenen Habilitationsschrift

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Schmitt, H. Histochemische Untersuchungen über das Verhalten der sauren Mukopolysaccharide bei Wundheilung der lamellierenden Keratoplastik. Albrecht von Graefes Arch. Klin. Ophthalmol. 213, 149–160 (1980). https://doi.org/10.1007/BF00410984

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