Abstract
The present study sought to characterize the expression and distribution of complex glycoconjugates in the rat retina by lectin histochemistry, using a panel of 21 different lectins with different carbohydrate specificities. Paraffin sections of Carnoy-fixed Sprague–Dawley rat eyes were stained with various biotinylated lectins, followed by the streptavidin-peroxidase and glucose oxidase–diaminobenzidine–nickel staining procedures. The results showed that the retinal pigment epithelium was stained intensely with LCA, Jacalin, WFA, S-WGA, PWA, DSA, UEA-I, LTA and PHA-E, suggesting that this epithelium contained glycoconjugates with α-Man, α-Glc, α-Gal/GalNAc, β-GalNAc, α-Fuc, NeuAc and other oligosaccharide residues. The outer and inner segments of the photoreceptor layer showed different lectin binding affinities. The outer segments reacted with S-WGA and GS-II, whereas the inner segments reacted with UEA-II, UEA-I, LTA and MAA, suggesting that the inner segments contained glycoconjugates rich in α-Fuc and NeuAc(α2,3)Gal residues. PNA labelled specifically the cones and could be used as a specific marker for these photoreceptors. RCA-I, WFA, S-WGA, DSA, MAA and PHA-E reacted with both the outer and inner plexiform layers. On the other hand, UEA-I and LTA specifically labelled the outer plexiform layer, while PNA labelled the inner plexiform layer. The retinal microglial cells were labelled specifically by GS-I-B4 and SNA. Interestingly, we also observed that WFA bound specifically to Müller cells and could be used as a novel marker for this retinal glial cell. The capillaries and larger vessels in the retina and choriocapillaris reacted intensely with GS-I-B4, RCA-I, S-WGA, PWA, DSA and PHA-E. No significant differences in lectin binding were observed in the microvessels at these two sites. In summary, the present study demonstrated the expression patterns of glycoconjugates in the rat retina and that certain lectins could be used as histochemical markers for specific structural and cellular components of the rat retina.
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Cho, E., Choi, H. & Chan, F.L. Expression pattern of Glycoconjugates in Rat Retina as Analysed by Lectin Histochemistry. Histochem J 34, 589–600 (2003). https://doi.org/10.1023/A:1026032005521
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DOI: https://doi.org/10.1023/A:1026032005521