Krüppel-like Factor 4 Modulates Development of BMI1(+) Intestinal Stem Cell-Derived Lineage Following γ-Radiation-Induced Gut Injury in Mice

Overview

Journal Stem Cell Reports

Publisher Cell Press

Specialty Cell Biology

Date 2016 May 31

PMID 27237377

Citations 19

Authors

Jes G Kuruvilla

Chang-Kyung Kim

Amr M Ghaleb

Agnieszka B Bialkowska

Calvin J Kuo

Vincent W Yang

Affiliations

Soon will be listed here.

Abstract

In response to ionizing radiation-induced injury, the normally quiescent intestinal stem cells marked by BMI1 participate in the regenerative response. Previously, we established a protective role for Krüppel-like factor 4 (KLF4) in the intestinal epithelium where it reduces senescence, apoptosis, and crypt atrophy following γ-radiation-induced gut injury. We also described a pro-proliferative function for KLF4 during the regenerative phase post irradiation. In the current study, using a mouse model in which Klf4 is deleted from quiescent BMI1(+) intestinal stem cells, we observed increased proliferation from the BMI1(+) lineage during homeostasis. In contrast, following irradiation, Bmi1-specific Klf4 deletion leads to decreased expansion of the BMI1(+) lineage due to a combination of reduced proliferation and increased apoptosis. Our results support a critical role for KLF4 in modulating BMI1(+) intestinal stem cell fate in both homeostasis and the regenerative response to radiation injury.

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