Development of differentiated characteristics in cultured kidney (thick ascending loop of Henle) cells.

This study describes the characterization of epithelial cells in culture following their isolation from the thick ascending limb of Henle's loop of rabbit kidney, by enzymatic digestion and subsequent purification using density gradient centrifugation. In culture, these cells expressed a variety of morphological, enzymatic and functional parameters expected of such cells in vivo. These cells were polarised, formed tight junctions and exhibited considerable lateral interdigitation between adjacent cells. They also developed characteristically high levels of activity of Na,K-ATPase, comparable to those seen in freshly isolated cells, and also expressed the functionally important Na,K,Cl-co transport system. The development of these systems in culture, however, was not coincident and their activities were reduced upon extended culture. The ability of these cells to develop and express differentiated characteristics in culture indicates that cells derived from defined kidney cell populations should provide valuable models for the study of the factors involved in the development and regulation of kidney cell type-specific characteristics.