Abstract Leading edge cells, which are located at the forefront of a wound margin, play a significant role in coordinating the wound healing process. In this study, leading edge cells of the ...urothelial explant outgrowth, resemblingleading edge cells during urothelial fullthickness wound healing in vivo, were analyzed for expression and distribution of junction and differentiation-related proteins. Ultrastructural and immunofluorescence studies revealed that urothelial cells at the leading edge expressed ZO-1, claudin-4, occludin, E-cadherin, cytokeratin 7 and cytokeratin 20, while no expression of claudin-8 was noted. ZO-1, claudin-4, occludin and E-cadherin were localized along the cell membranes where neighbouring leading edge cells were in contact. Cytokeratin 7 was detected as filaments and cytokeratin 20 assmall dots and sparse filaments. In conclusion, we detected early expressionof ZO-1, claudin-4 and occludin at the urothelial leading edge, predicating the later formation of tight junctions as a necessary stage for the differentiation process that subsequently begins. The expression of occludin and cytokeratin 20 in urothelial cells at the leading edge suggests that leading edge cells may develop into fully differentiated superficial cells.
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