Reconstitution of Runx2/Cbfa1-null cells identifies a requirement for BMP2 signaling through a Runx2 functional domain during osteoblast differentiation

被引:67
作者
Bae, Jong-Sup
Gutierrez, Soraya
Narla, Radhika
Pratap, Jitesh
Devados, Rajitha
van Wijnen, Andre J.
Stein, Janet L.
Stein, Gary S.
Lian, Jane B.
Javed, Amjad
机构
[1] Univ Massachusetts, Sch Med, Dept Cell Biol, Worcester, MA 01655 USA
[2] Univ Massachusetts, Sch Med, Ctr Canc, Worcester, MA 01655 USA
关键词
Runx2; transcriptional regulation; BMP2/TGFP osteogenic signaling; 1,25(OH)(2)D-3;
D O I
10.1002/jcb.21039
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The Runx2/Cbfa1 transcription factor is a scaffolding protein that promotes osteoblast differentiation; however, the specific Runx2-functional domains required for induction of the osteogenic lineage remain to be identified. We approached this question using a TERT-immortalized cell line derived from calvaria of Runx2-null mice by reconstituting the osteogenic activity with wild-type and deletion mutants of Runx2. The presence or absence of osteogenic media (beta-glycerol phosphate and ascorbic acid) and/or with BMP2 did not stimulate osteoblastic gene expression in the Runx2-null cells. However, cells infected with wild-type Runx2 adenovirus showed a robust temporal increase in the expression of osteoblast marker genes and were competent to respond to BMP2. Early markers (i.e., collagen type-1, alkaline phosphatase) were induced (four- to eightfold) at Days 4 and 8 of culture. Genes representing mature osteoblasts (e.g., Runx2, osteopontin, bone sialoprotein, osteocalcin) were temporally expressed and induced from 18-to 36-fold at Days 8 and 12. Interestingly, TGF beta and Vitamin D-mediated transcription of osteoblast genes (except for osteopontin) required the presence of Runx2. Runx2 lacking the C-terminal 96 amino acids (Runx2 Delta 432) showed a pattern of gene expression similar to wild-type protein, demonstrating the Groucho interaction and part of the activation domain are dispensable for Runx2 osteogenic activity. Upon further deletion of the Runx2 C-terminus containing the nuclear matrix targeting signal and Smad-interacting domain (Delta 391), we find none of the osteoblast markers are expressed. Therefore, the Runx2 391-432 domain is essential for execution of the BMP2 osteogenic signal.
引用
收藏
页码:434 / 449
页数:16
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