Bmi1 is Expressed in Postnatal Myogenic Satellite Cells, Controls Their Maintenance and Plays an Essential Role in Repeated Muscle Regeneration

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2011 Nov 19

PMID 22096526

Citations 27

Authors

Lesley G Robson

Valentina Di Foggia

Aleksandar Radunovic

Katy Bird

Xinyu Zhang

Silvia Marino

Affiliations

Soon will be listed here.

Abstract

Satellite cells are the resident stem cell population of the adult mammalian skeletal muscle and they play a crucial role in its homeostasis and in its regenerative capacity after injury. We show here that the Polycomb group (PcG) gene Bmi1 is expressed in both the Pax7 positive (+)/Myf5 negative (-) stem cell population as well as the Pax7+/Myf5+ committed myogenic progenitor population. Depletion of Pax7+/Myf5- satellite cells with reciprocal increase in Pax7+/Myf5+ as well as MyoD positive (+) cells is seen in Bmi1-/- mice leading to reduced postnatal muscle fiber size and impaired regeneration upon injury. Bmi1-/- satellite cells have a reduced proliferative capacity and fail to re-enter the cell cycle when stimulated by high serum conditions in vitro, in keeping with a cell intrinsic defect. Thus, both the in vivo and in vitro results suggest that Bmi1 plays a crucial role in the maintenance of the stem cell pool in postnatal skeletal muscle and is essential for efficient muscle regeneration after injury especially after repeated muscle injury.

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