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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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.
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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...
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Related Experiment Video

Updated: Jun 11, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

p53 control of bone remodeling.

Huijuan Liu1, Baojie Li

  • 1Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Bio-X Center, Shanghai, China.

Journal of Cellular Biochemistry
|July 1, 2010
PubMed
Summary

Tumor suppressor p53, a guardian of the genome, also safeguards cell differentiation. Mouse studies show p53 deficiency increases bone formation by enhancing stem cell proliferation and differentiation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Tumor suppressor p53 is a transcription regulator activated by stress.
  • p53 plays a critical role in bone remodeling, as evidenced by mouse genetic studies.
  • Upstream regulators of p53, including Atm, c-Abl, and Mdm2, also influence bone remodeling.

Purpose of the Study:

  • To investigate the role of p53 in bone remodeling and osteoblast differentiation.
  • To explore the molecular mechanisms by which p53 regulates bone formation.
  • To challenge the conventional understanding of tumor suppressor functions.

Main Methods:

  • Mouse genetic studies (loss-of-function and gain-of-function).
  • Analysis of mesenchymal stem cells and osteoprogenitor cells.

Related Experiment Videos

Last Updated: Jun 11, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

  • Investigation of p53's regulation of key transcription factors like Runx2/Osterix.

    • Main Results:

    • p53 deficiency enhances proliferation and accelerates differentiation in mesenchymal stem cells and osteoprogenitor cells.
    • Loss of p53 function leads to increased bone formation, mass, and density.
    • Evidence suggests p53 regulates osteoblast differentiation via Runx2/Osterix, influenced by BMP and IGF pathways.

    Conclusions:

    • p53 acts as a safeguard of cell differentiation, extending its role beyond "guardian of the genome."
    • These findings challenge the traditional view that tumor suppressors primarily inhibit proliferation and promote differentiation.
    • p53's complex role in regulating bone remodeling warrants further mechanistic investigation.