Summary
A serum-free medium (HMRI-2) has been developed for the outgrowth and subculture of epithelial cells from normal adult human ureter and bladder. Medium HMRI-2 consists of Ham’s MCDB 152 with double the amounts of the essential amino acids in Stock 1, low Ca2+ (0.06 mM) and is supplemented with epithelial growth factor, 5 ng/ml; transferrin, 5 μg/ml; insulin, 5 μg/ml; ethanolamine and phosphoethanolamine, 0.1 mM each; hydrocortisone, 2.8×10−6 M; and bovine pituitary extract, 126 μg protein/ml. The cultured cells showed ultrastructural markers of epithelial cells (prekeratin fibers, tonofilaments, surface microvilli with glycocalyx), exhibited ABO antigens, and had a normal human diploid karyotype. Primary cultures could be subcultured and also cryopreserved in HMRI-2 in liquid nitrogen. Cells in mass cultures showed a population doubling time of 40.5±4.5 h and had a maximum in vitro life span of 20 to 25 population doublings. It was observed that primary outgrowths, secondary cultures, and even cryopreserved cells all retained the capacity to respond to high Ca2+ and serum by differentiation and desquamation. This study has resulted in the availability of easily obtainable serum-free epithelial cultures from normal adult human ureter and bladder. The useful in vitro life span of these cultures may be important in future studies of carcinogenesis.
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This work was supported by a grant from the National Cancer Institute (R01CA25089), Bethesda, MD.
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Kirk, D., Kagawa, S., Vener, G. et al. Selective growth of normal adult human urothelial cells in serum-free medium. In Vitro Cell Dev Biol 21, 165–171 (1985). https://doi.org/10.1007/BF02621354
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DOI: https://doi.org/10.1007/BF02621354