TUMORIGENIC KERATINOCYTE LINES REQUIRING ANCHORAGE AND FIBROBLAST SUPPORT CULTURED FROM HUMAN SQUAMOUS-CELL CARCINOMAS

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  • 1 January 1981
    • journal article
    • research article
    • Vol. 41  (5) , 1657-1663
Abstract
Cell lines were established from 6 human squamous cell carcinomas (SCC) of the epidermis and tongue, using culture methods previously developed for clonal growth and serial cultivation of normal keratinocytes. The SCC lines all form rapidly growing, well-differentiated SCC''s or progressively growing squamous cysts in nude mice. In contrast to normal keratinocytes, SCC cells form unstratified or very poorly stratifying colonies and do not require epidermal growth factor for sustained growth. The SCC lines vary in their requirement for a fibroblast feeder layer to support clonal growth, from complete independence to absolute dependence. Only 1 line forms large, progressively growing colonies at high efficiency in semisolid medium; the other 5 lines exhibit only a small amount of abortive growth in semisolid medium, after which the cells appear to rapidly degenerate. SCC often grow as established lines in culture, but they frequently possess in vitro growth requirements similar to those of normal keratinocytes. Consequently, neither semisolid medium nor standard surface culture media are appropriate for initiating primary SCC cultures or for selecting transformants out of carcinogen-treated keratinocyte populations, because they do not provide conditions permissive for the growth of many malignant keratinocytes.