alexa Expression and localisation of apical junctional complex proteins in lens epithelial cells.
Ophthalmology

Ophthalmology

Journal of Clinical & Experimental Ophthalmology

Author(s): Sugiyama Y, Prescott AR, Tholozan FM, Ohno S, Quinlan RA

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Abstract The lens epithelium possesses an apical junctional complex (AJC) comprising adherens and tight junctions (AJs and TJs) and yet several key structural components and associated regulatory proteins have not been identified or localised in these cells. Here we determine the subcellular distribution of the archetypal TJ markers (ZO-1, claudin-1, and occludin) and TJ-associated cell polarity proteins (aPKC, Par3 and Par6beta) with AJ markers, E- and N-cadherin. As seen in other polarised epithelia, all these markers were located by confocal immunofluorescence microscopy to the apical ends of the lateral plasma membranes of bovine lens epithelial cells at sites of cell-cell interaction. Using immunoelectron microscopy, we show that ZO-1 concentrated at "kissing points" between neighbouring cells and these data, when taken in the context of our confocal immunofluorescence microscopy and blotting data, suggest the presence of TJs within the AJC. Likewise, immunogold labelling for E-cadherin identified AJs within these AJCs. We also report aPKC immunogold labelling localised to the AJC. These data show that the AJC of lens epithelial cells are a composite of TJs and AJs. This article was published in Exp Eye Res and referenced in Journal of Clinical & Experimental Ophthalmology

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