AIMS: To investigate the ultrastructural localisation of proteoglycans (PG), betaig-h3 (keratoepithelin), tenascin-C (TN-C)), fibrillin, and fibronectin in bullous keratopathy (BK) corneas. METHODS: Five corneas from cases of pseudophakic bullous keratopathy (BK) were examined by electron microscopy. PG were demonstrated using cuprolinic blue, and the proteins betaig-h3, TN-C, fibrillin, and fibronectin were immunolocalised with rabbit anti-betaig-h3, mouse anti-TN-C (BC10 and TN2), mouse anti-fibrillin-1 (MAB2502), mouse anti-fibrillin (MAB1919), and rabbit anti-fibronectin by using a standard immunogold technique. RESULTS: Epithelial cells contained numerous vacuoles. Epithelial folds and large, electron lucent subepithelial bullae were present. Basal lamina was thickened and traversed by disrupted anchoring filaments. In the stroma, interfibrillar collagen spacing was increased and abnormally large PG were present. Descemet's membrane (DM) contained lucent spaces in which there were small filaments. Keratocyte and endothelial cells contained melanin granules. A posterior collagenous layer (PCL) contained numerous microfilaments and wide spacing collagen fibres with a periodicity of 100 nm. Large quantities of abnormal PG were observed at the endothelial face of the PCL. Very strong labelling with betaig-h3 antibody was observed in the basement membrane, Bowman's layer, stroma, DM, and PCL, but not in keratocytes and endothelial cells. Strong labelling with BC10 and TN2 was seen below the epithelium, in electron lucent spaces where the hemidesmosomes were absent, in the fibrotic pannus, in parts of Bowman's layer, the stroma, and Descemet's membrane. Labelling with BC10 was stronger and more evenly distributed than with TN2. Fibrillin-1 (MAB2502) and fibrillin (MAB1919) labelling was similar to TN-C labelling. Fibrillin (MAB1919) labelling was stronger than fibrillin-1 (MAB2502) labelling. CONCLUSIONS: Immunoelectron microscopy showed precise labelling of proteins at both the cellular and the subcellular level. Expression of proteins betaig-h3, TN-C, fibrillin, and fibronectin was highly increased compared with normal cornea. In the oedematous stroma, increased collagen fibril separation may facilitate a wider distribution of some soluble proteins, such as betaig-h3, throughout stroma. The modified expression of the proteins studied in these cases of BK may be regarded as part of an injury response.
AIMS: To investigate the ultrastructural localisation of proteoglycans (PG), betaig-h3 (keratoepithelin), tenascin-C (TN-C)), fibrillin, and fibronectin in bullous keratopathy (BK) corneas. METHODS: Five corneas from cases of pseudophakic bullous keratopathy (BK) were examined by electron microscopy. PG were demonstrated using cuprolinic blue, and the proteins betaig-h3, TN-C, fibrillin, and fibronectin were immunolocalised with rabbit anti-betaig-h3, mouse anti-TN-C (BC10 and TN2), mouse anti-fibrillin-1 (MAB2502), mouse anti-fibrillin (MAB1919), and rabbit anti-fibronectin by using a standard immunogold technique. RESULTS: Epithelial cells contained numerous vacuoles. Epithelial folds and large, electron lucent subepithelial bullae were present. Basal lamina was thickened and traversed by disrupted anchoring filaments. In the stroma, interfibrillar collagen spacing was increased and abnormally large PG were present. Descemet's membrane (DM) contained lucent spaces in which there were small filaments. Keratocyte and endothelial cells contained melanin granules. A posterior collagenous layer (PCL) contained numerous microfilaments and wide spacing collagen fibres with a periodicity of 100 nm. Large quantities of abnormal PG were observed at the endothelial face of the PCL. Very strong labelling with betaig-h3 antibody was observed in the basement membrane, Bowman's layer, stroma, DM, and PCL, but not in keratocytes and endothelial cells. Strong labelling with BC10 and TN2 was seen below the epithelium, in electron lucent spaces where the hemidesmosomes were absent, in the fibrotic pannus, in parts of Bowman's layer, the stroma, and Descemet's membrane. Labelling with BC10 was stronger and more evenly distributed than with TN2. Fibrillin-1 (MAB2502) and fibrillin (MAB1919) labelling was similar to TN-C labelling. Fibrillin (MAB1919) labelling was stronger than fibrillin-1 (MAB2502) labelling. CONCLUSIONS: Immunoelectron microscopy showed precise labelling of proteins at both the cellular and the subcellular level. Expression of proteins betaig-h3, TN-C, fibrillin, and fibronectin was highly increased compared with normal cornea. In the oedematous stroma, increased collagen fibril separation may facilitate a wider distribution of some soluble proteins, such as betaig-h3, throughout stroma. The modified expression of the proteins studied in these cases of BK may be regarded as part of an injury response.
Authors: K Hashimoto; M Noshiro; S Ohno; T Kawamoto; H Satakeda; Y Akagawa; K Nakashima; A Okimura; H Ishida; T Okamoto; H Pan; M Shen; W Yan; Y Kato Journal: Biochim Biophys Acta Date: 1997-03-01
Authors: A Kaplony; D R Zimmermann; R W Fischer; B A Imhof; B F Odermatt; K H Winterhalter; L Vaughan Journal: Development Date: 1991-06 Impact factor: 6.868
Authors: D Suesskind; C Auw-Haedrich; D F Schorderet; F L Munier; K U Loeffler Journal: Graefes Arch Clin Exp Ophthalmol Date: 2005-12-06 Impact factor: 3.117
Authors: André A M Torricelli; Vivek Singh; Marcony R Santhiago; Steven E Wilson Journal: Invest Ophthalmol Vis Sci Date: 2013-09-27 Impact factor: 4.799
Authors: Saeed Akhtar; Andrew Tullo; Bruce Caterson; Janet R Davies; Kelly Bennett; Keith M Meek Journal: Br J Ophthalmol Date: 2002-02 Impact factor: 4.638
Authors: Ben J Glasgow; Oktay K Gasymov; Adil R Abduragimov; Jamison J Engle; Richard C Casey Journal: Invest Ophthalmol Vis Sci Date: 2009-12-03 Impact factor: 4.799
Authors: Eszter Szalai; Szabolcs Felszeghy; Zoltán Hegyi; László Módis; András Berta; Kai Kaarniranta Journal: Mol Vis Date: 2012-07-18 Impact factor: 2.367