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Related Concept Videos

Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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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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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Bone Remodeling01:40

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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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Osteoclasts in Bone Remodeling01:31

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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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Calmodulin-dependent Signaling01:16

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Bone Disorders01:29

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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.
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Related Experiment Video

Updated: Sep 13, 2025

Peptides from Phage Display Library Modulate Gene Expression in Mesenchymal Cells and Potentiate Osteogenesis in Unicortical Bone Defects
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A novel CB2 agonist peptide with bone-promoting activity.

Zhiheng Chen1, Ying Yu1, Zehua Lu1

  • 1School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.

Bioorganic Chemistry
|July 27, 2025
PubMed
Summary

Researchers identified novel peptides that activate the cannabinoid receptor subtype 2 (CB2) and promote bone growth. These findings offer a promising new therapeutic strategy for osteoporosis treatment.

Keywords:
AgonistCB2Osteogenic activityOsteoporosisVirtual peptide screening

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Biotechnology

Background:

  • Osteoporosis is a prevalent degenerative bone disease impacting patient quality of life.
  • Cannabinoid receptor subtype 2 (CB2) presents a potential therapeutic target for osteopathy.
  • Targeting CB2 may enhance osteoporosis patient outcomes and offer novel treatment avenues.

Purpose of the Study:

  • To screen for peptides with high binding affinity to CB2.
  • To validate the osteogenic activity of screened peptides.
  • To identify potential drug candidates for osteoporosis.

Main Methods:

  • Constructed a bioactive peptide database and virtual peptide library for screening.
  • Employed AutoDock, Glide, and AutoDock Vina for molecular docking simulations.
  • Validated CB2 agonistic activity via cAMP accumulation assays in HEK293 cells.
  • Assessed osteogenic effects on various osteoblast cell lines.

Main Results:

  • Screened and selected top 10 bioactive peptides based on docking scores.
  • Identified three peptides (APOCB2R3, APOCB2R4, APOCB2R7) that significantly activated CB2.
  • Demonstrated osteogenic activity of the selected peptides in osteoblast models.

Conclusions:

  • Successfully identified novel peptides with dual CB2 agonist and osteogenic properties.
  • These peptides represent promising leads for developing new osteoporosis therapeutics.
  • The study highlights a combined virtual screening and cell-based approach for drug discovery.