Related Experiment Video

Updated: Aug 19, 2026

Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation
08:43

Calcification of Vascular Smooth Muscle Cells and Imaging of Aortic Calcification and Inflammation

Published on: May 31, 2016

Runx2 is a common target of transforming growth factor beta1 and bone morphogenetic protein 2, and cooperation

K S Lee1, H J Kim, Q L Li

  • 1Department of Biochemistry, School of Medicine, and Medical Research Institute, Chungbuk National University, Cheongju 361-763, Korea.

Molecular and Cellular Biology
|November 14, 2000
PubMed

Insights

Transforming growth factor beta1 (TGF-beta1) and bone morphogenetic protein 2 (BMP-2) block muscle cell differentiation in C2C12 cells. Runx2 is a key protein mediating these effects and is crucial for bone cell development.

Area of Science:

  • Cellular and Molecular Biology
  • Developmental Biology
  • Biochemistry

Background:

  • Transforming growth factor beta1 (TGF-beta1) and bone morphogenetic protein 2 (BMP-2) are signaling molecules with complex roles in cell differentiation.
  • C2C12 cells, a myoblast cell line, are commonly used to study muscle cell differentiation.
  • The precise molecular mechanisms by which TGF-beta1 and BMP-2 inhibit muscle development and induce other cell fates are not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the inhibitory effects of TGF-beta1 and BMP-2 on myogenic differentiation in C2C12 cells.
  • To identify key regulatory proteins involved in the responses to TGF-beta1 and BMP-2 in C2C12 cells.
  • To elucidate the role of Runx2 in mediating the effects of TGF-beta1 and BMP-2 on C2C12 cell differentiation.

Main Methods:

  • Treatment of C2C12 cells with TGF-beta1 and BMP-2.
  • Identification of TGF-beta1-responsive element binding proteins using molecular assays.
  • Exogenous expression of Runx2 in C2C12 cells.
  • Analysis of gene expression for myogenic and osteogenic markers.
  • Assessment of cell differentiation into myotubes and osteoblasts.

Main Results:

  • Runx2, a key regulator of osteogenesis, was identified as a major TGF-beta1-responsive element binding protein induced by both TGF-beta1 and BMP-2 in C2C12 cells.
  • Exogenous expression of Runx2 partially mimicked the effects of TGF-beta1 and BMP-2, including suppression of MyoD expression and inhibition of myotube formation.
  • Osteoblast-specific gene expression required an additional effector, a BMP-specific Smad protein, in conjunction with Runx2.

Conclusions:

  • Runx2 is a critical target gene shared by both TGF-beta and BMP signaling pathways in C2C12 cells.
  • Runx2 plays a significant role in inhibiting myogenic differentiation and promoting characteristics of osteogenesis.
  • The combined action of Runx2 and BMP-activated Smads is essential for inducing osteoblast-specific gene expression.

More Related Videos

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells09:16

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells

Published on: September 1, 2019

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells06:54

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Published on: October 27, 2020

Related Concept Videos

Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012 for this...