Related Experiment Video
Updated: Oct 8, 2025
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
2.1K
High mobility group AT-hook 2 regulates osteoblast differentiation and facial bone development
Tsubasa Negishi1, Nozomi Mihara2, Tadashige Chiba2
1Department of Endodontics, The Nippon Dental University School of Life Dentistry at Tokyo, Tokyo, 102-8159, Japan.
Biochemical and Biophysical Research Communications
|January 1, 2022
Summary
High mobility group AT-hook 2 (Hmga2) gene is crucial for skeletal development. This study reveals Hmga2 deficiency impairs facial bone growth and suppresses osteoblast differentiation, highlighting its role in bone formation.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- High mobility group AT-hook 2 (Hmga2) gene mutations are linked to skeletal malformations.
- The precise mechanisms underlying Hmga2's role in skeletal development remain largely unelucidated.
Purpose of the Study:
- To investigate the role of Hmga2 in facial bone morphology and osteoblast differentiation.
- To elucidate the molecular mechanisms by which Hmga2 influences bone growth.
Main Methods:
- Analysis of facial bone morphology in Hmga2 knockout (Hmga2-/-) mice.
- Assessment of osteoblast differentiation in Hmga2 knockout MC3T3-E1 cells (A2KO).
- Gene expression analysis of osteoblast-related markers, including Osterix.
Main Results:
- Hmga2-/- mice exhibited reduced anterior frontal facial bone size.
- Hmga2 protein and mRNA were detected in mesenchymal cells of the nasal bone ossification area.
- A2KO cells showed suppressed osteoblast differentiation, evidenced by reduced alizarin red staining and alkaline phosphatase activity.
- Expression of key osteoblast-related genes, notably Osterix, was significantly downregulated in A2KO cells.
Conclusions:
- Hmga2 is closely associated with osteoblast differentiation of mesenchymal cells and overall bone growth.
- The findings suggest Hmga2 plays a significant role in osteoblastogenesis and skeletal development.
- Further research is warranted to fully understand Hmga2's contribution to bone formation.
Related Concept Videos
01:29Bone Formation by Intramembranous Ossification
8.2K
Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
8.2K
01:24Bone Formation by Endochondral Ossification
6.1K
Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
6.1K
01:40Bone Remodeling
38.7K
Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
38.7K
01:31Osteoclasts in Bone Remodeling
3.3K
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...
3.3K
01:17Hormones and Bone Tissue
3.1K
The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
3.1K
01:27Growth of Cartilage and Bone Tissue
3.6K
Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
3.6K