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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 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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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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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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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.
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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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Tgfbr2 is required in osterix expressing cells for postnatal skeletal development.

Sarah B Peters1, Ying Wang1, Rosa Serra1

  • 1Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, 1918 University Boulevard, Birmingham AL 35294, USA.

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Transforming growth factor β (TGFβ) signaling is crucial for immature osteoblast proliferation and maturation. Loss of TGFβ receptor II (Tgfbr2) in these cells leads to reduced bone volume and short stature in mice.

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Area of Science:

  • Skeletal Biology
  • Developmental Biology
  • Cell Signaling

Background:

  • Transforming growth factor β (TGFβ) plays a key role in skeletal development.
  • Loss of TGFβ receptor II (Tgfbr2) in mesenchymal cells causes skeletal defects.
  • Loss of Tgfbr2 in mature osteoblasts increases bone volume.

Purpose of the Study:

  • To investigate the role of Tgfbr2 in immature osteoblasts during postnatal skeletal development.
  • To elucidate the specific cellular mechanisms underlying Tgfbr2-mediated skeletal regulation.

Main Methods:

  • Generation of Osx-Cre;Tgfbr2fl/fl mice to delete Tgfbr2 in immature osteoblasts.
  • Analysis of skeletal phenotypes using X-ray, microCT, and histomorphometry.
  • Gene expression analysis (qRT-PCR) of osteoblast and proliferation markers.

Main Results:

  • Osx-Cre;Tgfbr2fl/fl mice exhibit postnatal defects in skull and long bone development, including short stature.
  • Reduced bone volume and osteoblast numbers were observed in Tgfbr2-deleted mice.
  • Decreased proliferation (PCNA) and impaired osteoblast maturation (Bglap) were evident, without altered apoptosis or osteoclast numbers.

Conclusions:

  • Tgfbr2 signaling is essential for the proliferation and maturation of immature osteoblasts.
  • The observed decrease in bone volume in Osx-Cre;Tgfbr2fl/fl mice is attributed to a reduction in mature osteoblast numbers.
  • Targeting Tgfbr2 in immature osteoblasts offers potential therapeutic avenues for skeletal disorders.