The quantitation and kinetics of unscheduled (repair) DNA synthesis in ultraviolet-irradiated human skin by automated image analysis.
Affiliation
CRC Department of Epithelial Biology, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester, U.K.Issue Date
1996-10
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Grain counting by eye is a tedious and time-consuming technique but one with great potential in cell kinetics and for the study of DNA excision repair activity (unscheduled DNA synthesis or UDS). We have been investigating the levels of UDS in human skin sections exposed in situ to ultraviolet radiation using a short-term incubation in tritiated thymidine and autoradiography and the decline in UDS levels with time (repair kinetics). We have adapted an automated image analysis system automatically to assess the number of grains over epidermal cell nuclei in autoradiographs of sections of epidermis. An excellent correlation was observed between visual counting and machine measurement of the area (in pixels) occupied by silver grains. The levels of UDS declined with time as lesions are progressively repaired. The half time (+/- standard deviation) for the reduction in UDS is 7.25 +/- 0.18 h. The grain counts can be significantly increased by increasing the autoradiographic exposure, by increasing the concentration of tritiated thymidine and by increasing the incubation time.Citation
The quantitation and kinetics of unscheduled (repair) DNA synthesis in ultraviolet-irradiated human skin by automated image analysis. 1996, 135 (4):516-22 Br. J. Dermatol.Journal
The British Journal of DermatologyDOI
10.1046/j.1365-2133.1996.d01-1032.xPubMed ID
8915138Type
ArticleLanguage
enISSN
0007-0963ae974a485f413a2113503eed53cd6c53
10.1046/j.1365-2133.1996.d01-1032.x
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