Related Experiment Video

Updated: May 24, 2026

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro
07:03

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

Published on: June 16, 2022

Differential protein and mRNA expression of CaMKs during osteoclastogenesis and its functional implications

Chao Hua Yao1, Pei Zhang, Liang Zhang

  • 1Palmer Laboratory of Cell & Molecular Biology, 4705 S. Clyde Morris Blvd, Port Orange, FL 32129, USA.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|March 21, 2012
PubMed

Insights

Calmodulin-dependent kinases (CaMKs) regulate osteoclastogenesis. This study reveals differential CaMK protein and mRNA expression during bone cell formation, highlighting CaMKIIδ and CaMKIV roles in early osteoclastogenesis.

Area of Science:

  • Bone biology and cell signaling.
  • Molecular mechanisms of osteoclast differentiation.

Background:

  • Calmodulin-dependent kinases (CaMKs) are implicated in osteoclastogenesis.
  • Conflicting reports exist on CaMK mRNA expression during osteoclast differentiation.
  • Protein expression patterns of most CaMKs in this process remain uncharacterized.

Purpose of the Study:

  • To investigate CaMK protein and mRNA expression patterns during osteoclastogenesis.
  • To clarify the role of CaMKs in early osteoclast differentiation using a mouse bone marrow monocyte model.

Main Methods:

  • Parallel Western blotting and quantitative real-time PCR were employed.
  • A mouse bone marrow monocyte model was utilized for cell culture.
  • The CaMK inhibitor KN93 was used to assess functional roles.

Main Results:

  • CaMKIIδ showed consistent mRNA and protein upregulation during osteoclastogenesis.
  • CaMKIV protein was initially undetectable, rising by Day 5.
  • KN93 inhibited osteoclastogenesis and expression of RANK signaling intermediates (ERK, Akt).

Conclusions:

  • Differential expression patterns of CaMK proteins and mRNAs were observed during osteoclastogenesis.
  • CaMKIIδ and CaMKIV exhibit distinct temporal expression profiles.
  • Evidence supports a CaMKII-RANK signaling interaction in regulating early osteoclastogenesis.

More Related Videos

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation09:37

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation

Published on: March 15, 2018

Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...