Interplay among p21Waf1/Cip1, MUSASHI-1 and Krüppel-like factor 4 in activation of Bmi1-CreER reserve intestinal stem cells after gamma radiation-induced injury.

Abstract:

:Gamma radiation is a commonly used adjuvant treatment for abdominally localized cancer. Since its therapeutic potential is limited due to gastrointestinal (GI) syndrome, elucidation of the regenerative response following radiation-induced gut injury is needed to develop a preventive treatment. Previously, we showed that Krüppel-like factor 4 (KLF4) activates certain quiescent intestinal stem cells (ISCs) marked by Bmi1-CreER to give rise to regenerating crypts following γ irradiation. In the current study, we showed that γ radiation-induced expression of p21Waf1/Cip1 in Bmi1-CreER cells is likely mitigated by MUSASHI-1 (MSI1) acting as a negative regulator of p21Waf1/Cip1 mRNA translation, which promotes exit of the Bmi1-CreER cells from a quiescent state. Additionally, Bmi1-specific Klf4 deletion resulted in decreased numbers of MSI1+ cells in regenerating crypts compared to those of control mice. We showed that KLF4 binds to the Msi1 promoter and activates its expression in vitro. Since MSI1 has been shown to be crucial for crypt regeneration, this finding elucidates a pro-proliferative role of KLF4 during the postirradiation regenerative response. Taken together, our data suggest that the interplay among p21Waf1/Cip1, MSI1 and KLF4 regulates Bmi1-CreER cell survival, exit from quiescence and regenerative potential upon γ radiation-induced injury.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Orzechowska EJ,Katano T,Bialkowska AB,Yang VW

doi

10.1038/s41598-020-75171-w

subject

Has Abstract

pub_date

2020-10-27 00:00:00

pages

18300

issue

1

issn

2045-2322

pii

10.1038/s41598-020-75171-w

journal_volume

10

pub_type

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