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Air–liquid and liquid–liquid interfaces influence the formation of the urothelial permeability barrier in vitro

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Abstract

Optimizing culture conditions is known to be crucial for the differentiation of urothelial cell cultures and the formation of the permeability barrier. However, so far, no data exist to confirm if air–liquid (AL) and liquid–liquid (LL) interfaces are physiologically relevant during urothelial differentiation and barrier formation. To reveal the influence of interfaces on the proliferation, differentiation, and barrier formation of the urothelial cells (UCs) in vitro, we cultured UCs under four different conditions, i.e., at the AL or LL interfaces with physiological calcium concentration and without serum or without physiological calcium concentration and with serum. For each of the four models, the urothelial integrity was tested by measuring the transepithelial resistance (TER), and the differentiation stage was examined by immunolabeling of differentiation-related markers and ultrastructural analysis. We found that the UCs at a LL interface, regardless of the presence or absence of calcium or serum, form the urothelium with more cell layers and achieve a higher TER than UCs at an AL interface. However, UCs grown at an AL interface with physiological concentration of calcium in medium form only one- to two-layered urothelium of UCs, which are larger and express more differentiation-related proteins uroplakins than UCs in other models. These results demonstrate that the interface itself can play a major, although so-far neglected, role in urothelial physiology, particularly in the formation of the urothelial permeability barrier in vitro and the regulatory mechanisms related with urothelial differentiation. In the study, the culturing of UCs in three successive steps is proposed.

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Acknowledgments

We thank Prof. Dr. Kristijan Jezernik and Prof. Dr. Rok Romih for their continuous support and Eva Lasič for checking the English of the manuscript. The study was supported by the Slovenian Research Agency ARRS (number P3-0108).

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  1. Institute of Cell Biology, Faculty of Medicine, University of Ljubljana, Lipičeva 2, 1000, Ljubljana, Slovenia

    Tanja Višnjar & Mateja Erdani Kreft

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  1. Tanja Višnjar
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  2. Mateja Erdani Kreft
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Correspondence to Mateja Erdani Kreft.

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Editor: T. Okamoto

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Višnjar, T., Kreft, M.E. Air–liquid and liquid–liquid interfaces influence the formation of the urothelial permeability barrier in vitro. In Vitro Cell.Dev.Biol.-Animal 49, 196–204 (2013). https://doi.org/10.1007/s11626-013-9585-5

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  • DOI: https://doi.org/10.1007/s11626-013-9585-5

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