Thymidine labelling index as a criterion of aging in vitro.

Abstract:

:For logarithmically growing cultures of the human diploid cell lines WI-38 and WI-26, there is an exponential increase in the fraction of cells not incorporating [3H]dT under conditions of continuous labelling. Thymidine uptake, phosphorylation and incorporation into DNA can be correlated with cell proliferation. In addition, determination of the labelling index is reproducible within relatively broad limits of thymidine concentrations and specific activity. The plateauing phenomenon of the curve expressing percent-labelled nuclei versus time, which occurs in populations with less than 100% cycling cells, is largely due to radiation damage to the cells. The results of these studies provide insight into the population dynamics of aging fibroblast-like cell cultures. More importantly, however, the measurement of labelling index as described can be used as a reproducible and quantitative measure of the age of the diploid cell culture.

journal_name

Gerontology

journal_title

Gerontology

authors

Cristofalo VJ

doi

10.1159/000212122

keywords:

subject

Has Abstract

pub_date

1976-01-01 00:00:00

pages

9-27

issue

1-2

eissn

0304-324X

issn

1423-0003

journal_volume

22

pub_type

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