Establishment and characterization of an epithelial cell line, SGE1, from isolated rat renal glomeruli.

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Abstract
An epithelial cell line, designated as SGE 1, has been established from isolated rat renal glomeruli. SGE 1 cells are able to grow continuously in a serum-free medium at similar growth rates to those in the medium containing serum. Quantitative studies of the cells in the serum-free condition demonstrated that SGE 1 cells required a collagen type I or IV, fibronectin, or laminin-coated substratum for adhesion and growth, and among them, collagen type I and IV were most effective. Essential medium supplements for the adhesion and growth were epidermal growth factor and transferrin, respectively, and both effects were noticeably enhanced with linoleic acid. Morphological observation found that in monolayer culture, SGE 1 cells formed domes, and in a collagen embedding culture, they formed cystic spheres having features of a simple cuboidal epithelium, polarized formation of microvilli and tight junctions as well as a lateral cell membrane with cytoplasmic projections. In addition, SGE 1 cells expressed Fx1A antigens, which are nephritogenic antigens on their microvilli.