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Related Concept Videos

Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

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 results in tumor...
Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

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 results in tumor...
Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

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...
Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

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...
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...
Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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...

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In Vitro Generation of Somite Derivatives from Human Induced Pluripotent Stem Cells
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Wnt10b increases postnatal bone formation by enhancing osteoblast differentiation.

Christina N Bennett1, Hongjiao Ouyang, Yanfei L Ma

  • 1Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan, USA.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|August 22, 2007
PubMed
Summary

Overexpressing Wnt10b in mice boosts bone mass by enhancing osteoblast activity. This study clarifies Wnt10b

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Area of Science:

  • Bone biology and skeletal development.
  • Endocrinology and metabolic bone diseases.
  • Genetics and molecular mechanisms of bone formation.

Background:

  • Wnt signaling is crucial for skeletal development and postnatal bone accrual.
  • Investigating Wnt signaling's role in bone mass regulation is key to understanding bone homeostasis.
  • Potential mechanisms include modulating osteoblast and osteoclast activity.

Purpose of the Study:

  • To investigate the specific role of Wnt10b in regulating bone mass.
  • To differentiate between Wnt signaling's effects on osteoblast and osteoclast lineages.
  • To analyze the impact of Wnt10b overexpression and deficiency on bone metabolism.

Main Methods:

  • Generation of transgenic mice overexpressing Wnt10b under the osteocalcin promoter (Oc-Wnt10b).
  • Utilized radiography, micro-computed tomography (muCT), and histomorphometry for bone analysis.
  • Assessed bone formation and resorption markers, including BrdU, TUNEL, TRACP5b, and CTX levels.

Main Results:

  • Oc-Wnt10b mice exhibited significantly increased bone mineral density (BMD), bone volume, and trabecular number.
  • Bone formation was elevated due to increased osteoblast numbers and mineral apposition rates.
  • Wnt10b-deficient mice showed reduced bone formation rates, decreased bone volume, and fewer trabeculae.

Conclusions:

  • Wnt10b overexpression primarily enhances bone mass by stimulating osteoblastogenesis.
  • Increased osteoblast activity, rather than osteoclast modulation, is the main driver of high bone mass.
  • Wnt10b plays a significant role in regulating postnatal bone accrual and maintaining bone homeostasis.