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Related Experiment Videos

Regulatory volume decrease (RVD) by isolated and in situ bovine articular chondrocytes.

P G Bush1, A C Hall

  • 1Department of Biomedical Sciences (Physiology), University Medical School, Hugh Robson Building, George Square, Edinburgh, UK.

Journal of Cellular Physiology
|April 25, 2001
PubMed
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Articular chondrocytes can regulate their volume (regulatory volume decrease) when exposed to osmotic changes, a process crucial for maintaining cell function in cartilage. This volume regulation ability is intact even after chondrocyte isolation from the matrix.

Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Osteoarthritis Research

Background:

  • Articular chondrocytes experience changing osmotic environments in physiological and pathological conditions.
  • Matrix hydration changes can affect chondrocyte volume and metabolism.
  • The volume regulation capacity of chondrocytes has not been extensively studied.

Purpose of the Study:

  • To investigate the regulatory volume decrease (RVD) capacity of bovine articular chondrocytes.
  • To compare RVD in chondrocytes within cartilage (in situ) versus isolated chondrocytes.
  • To determine if cell-matrix interactions influence RVD.

Main Methods:

  • Confocal laser scanning microscopy (CLSM) used to measure chondrocyte volume.
  • Chondrocytes visualized using fluorescent labeling at 21°C.

Related Experiment Videos

  • Cells studied in situ (superficial, mid, deep zones) and after isolation from cartilage matrix.
  • Exposure to hypotonic challenges (180mOsm, 250mOsm) and hypertonic conditions (380mOsm).
  • Effect of REV 5901 on RVD investigated.

    • Main Results:

    • Chondrocytes in situ rapidly swelled upon hypotonic challenge and exhibited robust RVD, returning to near initial volume within 20 minutes.
    • No significant differences in RVD rates were observed between different cartilage zones (superficial, mid, deep).
    • Isolated chondrocytes showed RVD responses identical to in situ cells.
    • RVD was inhibited by REV 5901, suggesting specific signaling pathways are involved.

    Conclusions:

    • Articular chondrocytes possess a significant capacity for regulatory volume decrease (RVD).
    • The RVD mechanism in chondrocytes is not dependent on cell-matrix interactions.
    • Signaling pathways for RVD remain functional after chondrocyte isolation, relevant for understanding cartilage homeostasis and osteoarthritis.