Mature enteroendocrine cells contribute to basal and pathological stem cell dynamics in the small intestine

American Journal of Physiology. Gastrointestinal and Liver Physiology
Yoshitatsu SeiStephen A Wank

Abstract

Lgr5-expressing intestinal stem cells (ISCs) maintain continuous and rapid generation of the intestinal epithelium. Here, we present evidence that dedifferentiation of committed enteroendocrine cells (EECs) contributes to maintenance of the epithelium under both basal conditions and in response to injury. Lineage-tracing studies identified a subset of EECs that reside at +4 position for more than 2 wk, most of which were BrdU-label-retaining cells. Under basal conditions, cells derived from these EECs grow from the bottom of the crypt to generate intestinal epithelium according to neutral drift kinetics that is consistent with dedifferentiation of mature EECs to ISCs. The lineage tracing of EECs demonstrated reserve stem cell properties in response to radiation-induced injury with the generation of reparative EEC-derived epithelial patches. Finally, the enterochromaffin (EC) cell was the predominant EEC type participating in these stem cell dynamics. These results provide novel insights into the +4 reserve ISC hypothesis, stem cell dynamics of the intestinal epithelium, and in the development of EC-derived small intestinal tumors. NEW & NOTEWORTHY The current manuscript demonstrating that a subset of mature enteroendocrine cell...Continue Reading

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Citations

Oct 15, 2019·Annual Review of Physiology·Heinrich Jasper
Aug 28, 2020·American Journal of Physiology. Gastrointestinal and Liver Physiology·Yoshitatsu SeiStephen A Wank
Dec 21, 2018·International Journal of Molecular Sciences·Helge L Waldum, Reidar Fossmark
May 22, 2019·International Journal of Molecular Sciences·Helge L WaldumPatricia G Mjønes
Aug 14, 2020·Stem Cell Research & Therapy·Xianglin MeiMeiying Li
Oct 13, 2020·Frontiers in Cell and Developmental Biology·Shiyu Xiao, Liya Zhou
Dec 8, 2020·Frontiers in Cell and Developmental Biology·William D ReesTheodore S Steiner
Jun 13, 2020·Stem Cell Reports·Natacha BohinLinda C Samuelson

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Methods Mentioned

BETA
immunoprecipitation
transgenic
confocal microscopy
FACS

Software Mentioned

Matlab

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