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Related Concept Videos

Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

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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...
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Bone Formation by Endochondral Ossification01:24

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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...
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Bone Remodeling01:40

Bone Remodeling

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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.
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Bone Cells and Tissue01:30

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
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Bone Formation by Intramembranous Ossification01:29

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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.
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Osteoclasts in Bone Remodeling01:31

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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...
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Related Experiment Video

Updated: Oct 11, 2025

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
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SMAD4 contributes to chondrocyte and osteocyte development.

Katayoon Pakravan1, Ehsan Razmara2, Bashdar Mahmud Hussen3

  • 1Department of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.

Journal of Cellular and Molecular Medicine
|November 29, 2021
PubMed
Summary

Mothers against decapentaplegic homolog 4 (SMAD4) is crucial for skeletal development and bone homeostasis. This review details SMAD4

Keywords:
SMAD4chondrogenesisepigenetic modulationsosteogenesissignalling pathways

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Last Updated: Oct 11, 2025

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Area of Science:

  • Skeletal Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • The role of Mothers against decapentaplegic homolog 4 (SMAD4) in skeletal development and bone homeostasis is not well-summarized.
  • SMAD4 is known for its roles in cancer and stem cell biology.
  • Understanding SMAD4's function is key to bone health.

Purpose of the Study:

  • To review the critical roles of SMAD4 in skeletal development.
  • To elucidate how SMAD4 influences stem cell features.
  • To explore the contribution of epigenetic factors to chondrocyte and osteocyte development.

Main Methods:

  • Literature review of signaling pathways involving SMAD4.
  • Analysis of SMAD4's role in defining stem cell features.
  • Examination of epigenetic factors (DNA methylation, histone modifications, noncoding RNAs) in skeletal development.
  • Review of genotype-phenotype correlations in animal models.

Main Results:

  • SMAD4 plays vital roles in chondrocyte and osteocyte development.
  • SMAD4 influences stem cell characteristics relevant to skeletal tissues.
  • Epigenetic mechanisms are integral to skeletal cell differentiation.
  • Animal models demonstrate clear genotype-phenotype relationships for SMAD4.

Conclusions:

  • SMAD4 is essential for proper cartilage and bone development.
  • Further understanding of SMAD4's function can lead to therapeutic strategies for skeletal disorders.
  • This review consolidates current knowledge on SMAD4 in skeletal biology.