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Related Concept Videos

Hedgehog Signaling Pathway02:33

Hedgehog Signaling Pathway

The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
Hedgehog Signaling Pathway02:33

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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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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 bone...
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Bone Cells and Tissue

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.
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Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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Published on: February 28, 2017

Osterix is required for Sonic hedgehog-induced osteoblastic MC3T3-E1 cell differentiation.

Ye Tian1, Ying Xu, Qin Fu

  • 1Department of Orthopaedics, Shengjing Hospital of China Medical University, Sanhao Street 36, Heping District, Shenyang 110004, China. tianyecmu2h@sina.com

Cell Biochemistry and Biophysics
|June 1, 2012
PubMed
Summary

Sonic hedgehog (Shh) signaling promotes osteoblast differentiation by increasing osterix (Osx) expression. This process is crucial for bone development and occurs independently of Runx2 in early stages.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Hedgehog (Hh) signaling is vital for bone development.
  • The precise mechanisms of Hh-induced osteoblast differentiation remain unclear.

Purpose of the Study:

  • Investigate Sonic hedgehog (Shh) effects on osteoblast differentiation in MC3T3-E1 cells.
  • Determine the role of osterix (Osx) in Shh-mediated osteoblastogenesis.

Main Methods:

  • Real-time RT-PCR to analyze gene expression (osteocalcin, alkaline phosphatase, bone sialoprotein, Type I collagen, Runx2, Osx).
  • Western blotting and reporter assays to assess protein activity and expression (ALP, Osx).
  • siRNA-mediated knockdown of Runx2 and Osx to evaluate their roles.

Main Results:

  • Shh significantly upregulated osteoblast differentiation markers and Osx expression in MC3T3-E1 cells.
  • Shh treatment enhanced alkaline phosphatase activity, Osx protein levels, and Osx promoter activity.
  • Osx knockdown completely inhibited Shh-induced osteoblast differentiation, while Runx2 knockdown had minimal early effect.

Conclusions:

  • Shh stimulates early osteoblast differentiation primarily by upregulating Osx expression.
  • This Shh-induced osteoblast differentiation occurs through both Runx2-dependent and Runx2-independent pathways.