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. 1991 Apr 1;88(7):2638–2642. doi: 10.1073/pnas.88.7.2638

Dose-dependent induction of resistance to terminal differentiation in x-irradiated cultures of normal human keratinocytes.

M Tuynder 1, S Godfrine 1, J J Cornelis 1, J Rommelaere 1
PMCID: PMC51293  PMID: 2011575

Abstract

Epidermal cell clones able to proliferate under conditions that cause normal human foreskin keratinocytes (NHK) to terminally differentiate were obtained in a dose-dependent fashion after repeated x-irradiation. No terminal differentiation-resistant (TDR) clones were detected unless the total x-ray dose was split in several fractions given at protracted intervals. The x-ray-induced TDR cells were aneuploid and differed from growing NHK with regard to expression of specific protein markers of differentiation. One of the isolated TDR clones escaped senescence but failed to form tumors in nude mice. Altogether, these data indicate that NHK cultures can be used to quantitate phenotypic changes associated with neoplastic transformation of normal human epithelial cells upon exposure to defined regimens of physicochemical treatments.

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