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Bone Remodeling and Repair

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...
Growth of Cartilage and Bone Tissue01:27

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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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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: May 13, 2026

Visualizing Angiogenesis by Multiphoton Microscopy In Vivo in Genetically Modified 3D-PLGA/nHAp Scaffold for Calvarial Critical Bone Defect Repair
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Osteoinductive small molecules: growth factor alternatives for bone tissue engineering.

Aja Aravamudhan1, Daisy M Ramos, Jonathan Nip

  • 1Institute for Regenerative Engineering, and Raymond and Beverly Sackler Center for Biological, Physical and Engineering Sciences, The University of Connecticut, Farmington, CT 06030-3711, USA.

Current Pharmaceutical Design
|February 26, 2013
PubMed
Summary
This summary is machine-generated.

Small molecules like melatonin, resveratrol, and purmorphamine offer a promising alternative to growth factors for tissue regeneration. These compounds effectively induce bone formation and stem cell differentiation through various signaling pathways.

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Published on: September 11, 2015

Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Tissue engineering utilizes biomaterials, cells, and factors to repair damaged tissues.
  • Growth factors are commonly used but have limitations like high cost and side effects.
  • Small molecules are emerging as effective, cost-efficient alternatives for tissue regeneration.

Purpose of the Study:

  • To explore small molecules as alternatives to growth factors in tissue engineering.
  • To focus on three osteoinductive small molecules: melatonin, resveratrol, and purmorphamine.
  • To summarize the biological pathways involved in their bone formation and osteogenic differentiation effects.

Main Methods:

  • Review of literature on small molecules in tissue engineering.
  • Focus on melatonin, resveratrol, and purmorphamine for bone regeneration.
  • Analysis of signaling pathways including MAP kinase, BMP, Wnt, Sirt1, and Hedgehog.

Main Results:

  • Melatonin influences MAP kinase, BMP, and Wnt signaling.
  • Resveratrol activates Wnt and Sirt1 pathways.
  • Purmorphamine acts as a Hedgehog pathway agonist via Smoothened receptors.

Conclusions:

  • Small molecules present a viable alternative to growth factors in tissue engineering.
  • Melatonin, resveratrol, and purmorphamine demonstrate potential for inducing osteogenesis.
  • Understanding their signaling pathways is crucial for optimizing regenerative strategies.