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Related Concept Videos

Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

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Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
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The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
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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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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 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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Related Experiment Video

Updated: Aug 10, 2025

Modeling Paracrine Noncanonical Wnt Signaling In Vitro
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Wnt7b: Is It an Important Factor in the Bone Formation Process after Calvarial Damage?

Bo Feng1,2,3,4,5,6, Jun Pei2,3,4,5,6,7, Shensheng Gu1,2,3,4,5,6

  • 1Department of Endodontics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.

Journal of Clinical Medicine
|February 11, 2023
PubMed
Summary

Wnt7b overexpression accelerates skull defect repair by promoting osteogenesis. This study shows increased bone formation and improved bone structure in a mouse model, highlighting Wnt7b's therapeutic potential for craniomaxillofacial bone repair.

Keywords:
Wnt7bbone formationcalvarial damagecalvarial defect modelosteogenesis

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Area of Science:

  • Bone biology and regenerative medicine.
  • Craniomaxillofacial surgery and skeletal development.

Background:

  • Wnt7b is crucial for osteoblast differentiation and bone loss repair.
  • The precise role of Wnt7b in osteogenesis and its potential for skull defect treatment remain under investigation.

Purpose of the Study:

  • To investigate the role of Wnt7b in osteogenesis.
  • To determine if Wnt7b overexpression can enhance the repair of skull defects.
  • To provide foundational data for Wnt7b's application in craniomaxillofacial bone repair.

Main Methods:

  • Established a calvarial defect mouse model with inducible Wnt7b overexpression.
  • Administered tamoxifen (TAM) or oil via intraperitoneal injection to induce Wnt7b expression.
  • Utilized micro-CT scanning to assess new bone formation and bone structure 4 weeks post-surgery.

Main Results:

  • Wnt7b overexpression significantly reduced the defect area in the TAM group compared to controls.
  • Bone volume fraction (BV/TV) increased significantly (p < 0.05) with Wnt7b overexpression.
  • Increased trabecular number (Tb.N) and decreased trabecular separation (Tb.Sp) were observed, indicating improved bone quality.

Conclusions:

  • Wnt7b plays a significant role in the bone formation process following calvarial injury.
  • Wnt7b is essential for osteogenesis and demonstrates potential for promoting skull defect repair.