Summary
Cell cultures were initiated from seven human fetal kidneys that varied in gestational age from 90 days to newborn. The growth medium utilized was a 1:1 mixture of Dulbecco’s modified Eagle’s and Ham’s F12 supplemented with selenium (5 ng/ml), insulin (5µg/ml), transferrin (5µg/ml), hydrocortisone (36 ng/ml), triiodothyronine (4 pg/ml), and epidermal growth factor (10 ng/ml). For all the kidney isolates, initial cell attachment occurred within 12 h through multicell spheroids, and by 24 h a rapidly growing population of cells was obtained. Confluency was reached within 3 to 6 days. A combination of light microscopy, immunohistochemistry, and ultrastructural evaluation was utilized to characterize the resulting cultures as epithelial and homogeneous within each isolate and among the isolates. That is, regardless of gestational age of the fetal kidney used as starting material, an identical or highly similar population of cells was obtained. By light microscopy, the cultures were noted to form very few domes, the number being an indication of transport activity. However, ultrastructural examination revealed that the cells were noted to form domes composed of only a few cells or “micro-domes” that would not be visible by light microscopy. Within the micro-domes as well as other areas of the monolayer an apparent absence of tight junctions was noted by routine transmission electron microscopy. However, by freeze fracture analysis cells were shown to possess sealing strands, the structural component of tight junctions. It is postulated that the tight junctions of fetal epithelial cells are structurally altered as compared to tight junctions in adult renal epithelial cell cultures.
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Hazen-Martin, D.J., Tarnowski, B.I., Todd, J.H. et al. Serum-free culture and characterization of renal epithelial cells isolated from human fetal kidneys of varying gestational age. In Vitro Cell Dev Biol - Animal 30, 356–365 (1994). https://doi.org/10.1007/BF02634355
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DOI: https://doi.org/10.1007/BF02634355