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Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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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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Hormones and Bone Tissue01:17

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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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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...
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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 growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
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Peptides from Phage Display Library Modulate Gene Expression in Mesenchymal Cells and Potentiate Osteogenesis in Unicortical Bone Defects
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Increased osteoblast Gα11 level compromises bone healing quality by suppressing high-density bone formation.

Kathy K Lee1, Adele Changoor2, Marc D Grynpas3

  • 1Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada; Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada.

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Increased Gα11 in osteoblastic cells impairs bone fracture healing. This leads to reduced cartilage and osteoblast formation, resulting in mechanically weaker bones in transgenic mice.

Keywords:
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Area of Science:

  • Skeletal Biology
  • Molecular Biology
  • Biomedical Engineering

Background:

  • Gαq/11 proteins are crucial in skeletal development, with abnormalities linked to bone defects.
  • Previous studies highlight the role of Gαq/11 in bone through genetic mutations or overexpression.

Purpose of the Study:

  • To investigate the impact of elevated Gα11 expression in osteoblastic cells on bone fracture repair.
  • To compare fracture healing in transgenic (G11-Tg) mice with increased Gα11 to wild-type (WT) mice.

Main Methods:

  • Stabilized tibial osteotomies were performed on male G11-Tg and WT mice.
  • Fracture healing was assessed weekly for 4 weeks using micro-CT, histomorphometry, and gene expression analysis.
  • Bone biomechanics were evaluated after 4 weeks via torsion testing.

Main Results:

  • G11-Tg mice exhibited diminished cartilage at peak callus formation and fewer osteoblasts during healing.
  • Micro-CT revealed lower bone volume and mineral content in G11-Tg mice.
  • Gene expression showed reduced chondrocyte markers (Sox9, Col2a1, Col10a1) and osteoblast markers (Runx2, osteocalcin) in G11-Tg mice.
  • Torsion testing demonstrated significantly lower yield torque and torsional stiffness in G11-Tg mice.

Conclusions:

  • Increased Gα11 inhibits endochondral bone development during fracture repair.
  • This inhibition stems from suppressed chondrocyte and osteoblast formation.
  • Elevated Gα11 leads to mechanically compromised bone healing.