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Radiation Protection Dosimetry 91:41-45 (2000)
© 2000 Oxford University Press

Characterisation of Human Keratinocytes by Measuring Cellular Repair Capacity of UVB-Induced DNA Damage and Monitoring of Cytogenetic Changes in Melanoma Cell Lines

R. Greinert, E.W. Breibart, D. Mitchell, J. Smida and B. Volkmer

The molecular mechanisms for UV-induced photocarcinogenesis are far from being understood in detail, especially in the case of malignant melanoma of the skin. Nevertheless, it is known that deficiencies in cellular repair processes of UV-induced DNA damage (e.g. in the case of Xeroderma pigmentosum) represent important aetiological factors in the multistep development of skin cancer. The repair kinetics have therefore been studied of an established skin cell line (HaCaT), primary human keratinocytes, melanocytes and melanoma cell lines, using fluorescence microscopy and flow cytometry. Our data show a high degree of interindividual variability in cellular repair capacity for UV-induced DNA lesions, which might be due to individual differences in the degree of tolerable damage and/or the onsets of saturation of the enzymatic repair system. The cytogenetic analysis of melanoma cell lines, using spectral karyotyping (SKY) furthermore proves that malignant melanoma of the skin are characterised by high numbers of chromosomal aberrations.


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