Age-Dependent Differences in Radiation-Induced DNA Damage Responses in Intestinal Stem Cells.

ABSTRACT: Age at exposure is a critical modifier of the risk of radiation-induced cancer. However, the effects of age on radiation-induced carcinogenesis remain poorly understood. In this study, we focused on tissue stem cells using Lgr5-eGFP-ires-Cre^ERT2 mice to compare radiation-induced DNA damage responses between Lgr5+ and Lgr5- intestinal stem cells. Three-dimensional immunostaining analyses demonstrated that radiation induced apoptosis and the mitotic index more efficiently in adult Lgr5- stem cells than in adult Lgr5+ stem cells but not in infants, regardless of Lgr5 expression. Supporting this evidence, rapid and transient p53 activation occurred after irradiation in adult intestinal crypts but not in infants. RNA sequencing revealed greater variability in gene expression i

SUBMITTER: Zhou G 

PROVIDER: S-EPMC11431935 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature