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Related Experiment Video

Updated: Jul 23, 2026

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
08:52

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness

Published on: March 18, 2022

Adipose-derived extracellular vesicles RBP4 aggravates osteoarthritis by inducing chondrocyte mitochondrial

Bo Yang1, Zihang Chen1, Kewei Zhu2

  • 1Department of Joint Surgery, The Affiliated Nanhua Hospital, University of South China, Hengyang, 421002, Hunan, China.

Biochimica Et Biophysica Acta. Molecular Basis of Disease
|July 14, 2026
PubMed
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Obesity promotes osteoarthritis (OA) via extracellular vesicles (EVs) carrying Retinol-Binding Protein 4 (RBP4) from fat tissue to cartilage cells. This RBP4 induces mitochondrial dysfunction, worsening OA. Targeting this pathway offers a new therapeutic approach for obesity-associated OA.

Area of Science:

  • Metabolic pathways
  • Mitochondrial biology
  • Extracellular vesicle biology

Background:

  • Obesity is a major risk factor for osteoarthritis (OA), but the precise molecular mechanisms linking them are not fully understood.
  • Adipose tissue dysfunction in obesity may release factors that negatively impact joint health.
  • Extracellular vesicles (EVs) are emerging as key mediators of intercellular communication, particularly in metabolic diseases.

Purpose of the Study:

  • To investigate the role of extracellular vesicles (EVs) derived from obese adipose tissue (AT-EVs) in osteoarthritis (OA) pathogenesis.
  • To determine if the adipokine Retinol-Binding Protein 4 (RBP4) delivered by AT-EVs contributes to OA development.
  • To explore the therapeutic potential of targeting the RBP4-mediated pathway in obesity-associated OA.

Main Methods:

Keywords:
ChondrocytesExtracellular vesicles (EVs)Mitochondrial dysfunctionObesityOsteoarthritisRetinol-binding protein 4 (RBP4)

Related Experiment Videos

Last Updated: Jul 23, 2026

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
08:52

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness

Published on: March 18, 2022

  • Established high-fat diet (HFD)-induced obesity and surgical OA mouse models.
  • Isolated and characterized EVs from adipose tissue of obese and control mice.
  • Utilized in vitro chondrocyte cultures stimulated with TNF-α and treated with AT-EVs to assess cellular responses and signaling pathways.
  • Performed genetic knockdown of RBP4 in adipocytes to evaluate its specific role in EV-mediated pathology.

Main Results:

  • Obese AT-EVs significantly worsened cartilage degradation and synovitis in vivo.
  • In vitro, obese AT-EVs induced chondrocyte inflammation, catabolism, apoptosis, and mitochondrial dysfunction.
  • Retinol-Binding Protein 4 (RBP4) was identified as the key pathogenic cargo within AT-EVs, activating PI3K/AKT and JAK2/STAT3 signaling.
  • Knockdown of RBP4 in adipocyte-derived EVs abolished their detrimental effects on chondrocytes and OA models.

Conclusions:

  • Retinol-Binding Protein 4 (RBP4) enriched in extracellular vesicles from obese adipose tissue is a critical mediator of osteoarthritis pathogenesis.
  • This RBP4 promotes OA by inducing mitochondrial dysfunction and inflammatory/catabolic phenotypes in chondrocytes.
  • Targeting the RBP4-carrying EVs presents a novel therapeutic strategy for obesity-associated osteoarthritis.