RBPjkappa-dependent Notch Signaling Regulates Mesenchymal Progenitor Cell Proliferation and Differentiation During Skeletal Development

Overview

Journal Development

Specialty Biology

Date 2010 Mar 26

PMID 20335360

Citations 108

Authors

Yufeng Dong

Alana M Jesse

Anat Kohn

Lea M Gunnell

Tasuku Honjo

Michael J Zuscik

Regis J OKeefe

Matthew J Hilton

Affiliations

Soon will be listed here.

Abstract

The Notch pathway has recently been implicated in mesenchymal progenitor cell (MPC) differentiation from bone marrow-derived progenitors. However, whether Notch regulates MPC differentiation in an RBPjkappa-dependent manner, specifies a particular MPC cell fate, regulates MPC proliferation and differentiation during early skeletal development or controls specific Notch target genes to regulate these processes remains unclear. To determine the exact role and mode of action for the Notch pathway in MPCs during skeletal development, we analyzed tissue-specific loss-of-function (Prx1Cre; Rbpjk(f/f)), gain-of-function (Prx1Cre; Rosa-NICD(f/+)) and RBPjkappa-independent Notch gain-of-function (Prx1Cre; Rosa-NICD(f/+); Rbpjk(f/f)) mice for defects in MPC proliferation and differentiation. These data demonstrate for the first time that the RBPjkappa-dependent Notch signaling pathway is a crucial regulator of MPC proliferation and differentiation during skeletal development. Our study also implicates the Notch pathway as a general suppressor of MPC differentiation that does not bias lineage allocation. Finally, Hes1 was identified as an RBPjkappa-dependent Notch target gene important for MPC maintenance and the suppression of in vitro chondrogenesis.

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