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Related Concept Videos

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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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.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
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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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Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

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Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
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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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Pharmacokinetics in Pediatric Patients: Drug Metabolism01:24

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In pediatric care, understanding the nuances of hepatic drug metabolism is crucial, as it significantly differs from that of adults. This divergence is primarily due to the developmental stage of drug-metabolizing enzymes, which affects how medications are processed in the body. In neonates, for instance, the activity of Phase I enzymes—critical for the initial breakdown of drugs—is markedly reduced, functioning at just 20–40% of the levels seen in adults. This reduction poses...
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Related Experiment Video

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Assessment of the Effects of Endocrine Disrupting Compounds on the Development of Vertebrate Neural Network Function Using Multi-electrode Arrays
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Bisphenol A disrupts cartilage homeostasis through CYP2C19.

Yichen Bai1,2, Kai Feng1,2, Tengyao Niu1

  • 1First Clinical Medical College, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, China.

Naunyn-Schmiedeberg'S Archives of Pharmacology
|December 5, 2025
PubMed
Summary

Bisphenol A (BPA) exposure is linked to osteoarthritis (OA) by disrupting extracellular matrix organization and activating inflammatory pathways. Network toxicology identifies CYP2C19 as a key target, revealing mechanisms of BPA-induced OA toxicity.

Keywords:
Bisphenol AMolecular dockingNetwork toxicologyOsteoarthritis

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Area of Science:

  • Environmental Health
  • Toxicology
  • Molecular Biology

Background:

  • Bisphenol A (BPA) is an endocrine-disrupting chemical (EDC) with known hormonal and inflammatory effects.
  • Its specific role in osteoarthritis (OA) pathogenesis is not well understood, representing a significant environmental health research gap.

Purpose of the Study:

  • To investigate the molecular mechanisms by which BPA contributes to OA pathogenesis using network toxicology and molecular docking.
  • To identify key protein targets of BPA involved in OA and evaluate their binding affinities.

Main Methods:

  • Network toxicology approach integrating multi-database analysis to identify shared BPA-OA targets and key genes.
  • Topological metrics (degree, betweenness, closeness centrality) for gene prioritization.
  • Gene Ontology (GO) and KEGG pathway enrichment analysis.
  • Molecular docking (AutoDock Vina) and molecular dynamics simulations to assess binding affinities and complex stability.
  • Toxicity prediction using ProTox-3.0.

Main Results:

  • Identified 233 shared targets between BPA and OA.
  • BPA was found to perturb extracellular matrix organization and activate NF-κB and MAPK signaling pathways.
  • Molecular docking revealed BPA's strongest binding affinity towards CYP2C19 (-7.3 kcal/mol), with stable interactions confirmed by molecular dynamics simulations.
  • BPA showed relatively low acute oral toxicity (LD₅₀ = 4950 mg/kg in rats).

Conclusions:

  • CYP2C19 is identified as a preferential molecular target of BPA in the context of OA.
  • The study provides mechanistic insights into BPA-induced OA toxicity, highlighting the role of network toxicology.
  • Findings support further toxicological evaluation of BPA and may inform public health policies and therapeutic strategies for OA.