Related Experiment Video

Updated: May 22, 2026

Isolation of Whole Cell Protein Lysates from Mouse Facial Processes and Cultured Palatal Mesenchyme Cells for Phosphoprotein Analysis
07:26

Isolation of Whole Cell Protein Lysates from Mouse Facial Processes and Cultured Palatal Mesenchyme Cells for Phosphoprotein Analysis

Published on: April 1, 2022

PKC signaling inhibits osteogenic differentiation through the regulation of Msx2 function

Hyung Min Jeong1, Yun-Hye Jin, You Hee Choi

  • 1Chonnam National University, Gwangju, Republic of Korea.

Biochimica Et Biophysica Acta
|May 29, 2012
PubMed

Insights

Protein kinase C (PKC) signaling regulates bone formation by affecting Msx2 protein levels. Inhibiting PKC enhances osteoblast differentiation and relieves Msx2-mediated repression of Runx2.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein kinase C (PKC) signaling is crucial for osteoblast differentiation.
  • The downstream effectors of PKC in this process are not well understood.
  • Msx2 is an important transcription factor in bone formation and osteoblast differentiation.

Purpose of the Study:

  • To investigate the role of PKC signaling in regulating Msx2.
  • To determine how PKC modulates osteoblast differentiation via Msx2.

Main Methods:

  • Modulating PKC activity using inhibitors and dominant-negative mutants in C2C12 cells.
  • Assessing osteogenic differentiation and transcription factor levels (Msx2, Runx2).
  • Investigating PKC-Msx2 interactions and Msx2 phosphorylation by PKC isoforms.

Main Results:

  • Inhibition of PKC signaling enhanced BMP2-induced osteoblast differentiation in C2C12 cells.
  • PKC inhibition or expression of kinase-defective mutants reduced Msx2 protein levels.
  • PKC isoforms (α, β, δ, ζ) interacted with Msx2; PKCβ phosphorylated Msx2 at Thr135 and Thr141.
  • PKC activity prolonged Msx2 protein half-life and enhanced Msx2-mediated repression of Runx2 transcriptional activity, which was relieved upon PKC inhibition.

Conclusions:

  • PKC signaling negatively regulates osteoblast differentiation by controlling Msx2 protein levels and function.
  • PKC-mediated phosphorylation and stabilization of Msx2 are key mechanisms.
  • PKC signaling modulates osteoblast differentiation, at least in part, through the regulation of Msx2.

More Related Videos

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model08:42

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

Related Concept Videos

The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
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...