Rate of loss of tritiated thymidine label in basal cells in mouse epithelial tissues

JR Bickenbach, J McCutecheon… - Cell …, 1986 - Wiley Online Library
JR Bickenbach, J McCutecheon, IC Mackenzie
Cell Proliferation, 1986Wiley Online Library
A subpopulation of epithelial cells which retains a tritiated thymidine label (termed label‐
retaining cells, LRCs) has been previously demonstrated in skin and oral mucosae of mice
and hamsters. to examine the rate of decrease in the number of LRCs and the changes in
degree of labelling, young mice were labelled with tritiated thymidine and the rate at which
label was diluted from basal keratinocytes assessed for up to 90 days. the number of LRCs
in each tissue examined decreased from 15 to 90 days after labelling with the epidermal …
Abstract
A subpopulation of epithelial cells which retains a tritiated thymidine label (termed label‐retaining cells, LRCs) has been previously demonstrated in skin and oral mucosae of mice and hamsters. to examine the rate of decrease in the number of LRCs and the changes in degree of labelling, young mice were labelled with tritiated thymidine and the rate at which label was diluted from basal keratinocytes assessed for up to 90 days. the number of LRCs in each tissue examined decreased from 15 to 90 days after labelling with the epidermal tissues maintaining a higher percentage of LRCs than the oral mucosae. Grain counts for LRCs in each tissue at each time period indicated that the number of silver grains overlying LRCs also decreased with time. the observed decrease in numbers of LRCs and the change in their degree of labelling with time suggest that such cells divide slowly, a property associated with stem cells.
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