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Related Experiment Videos

Parathyroid-induced angiogenesis is VEGF-dependent.

W B Carter1, K Uy, M D Ward

  • 1Department of Surgery, Eastern Virginia Medical School, Norfolk, VA, USA.

Surgery
|August 31, 2000
PubMed
Summary

Parathyroid tissue transplantation promotes new blood vessel growth (angiogenesis) by upregulating vascular endothelial growth factor (VEGF). This VEGF production is crucial for successful parathyroid function after surgery.

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Area of Science:

  • Endocrinology
  • Vascular Biology
  • Tissue Engineering

Background:

  • Parathyroid autotransplantation is effective for restoring parathyroid function post-parathyroidectomy.
  • Parathyroid tissue's ability to induce angiogenesis is key to its transplantation success.
  • Vascular Endothelial Growth Factor (VEGF) is a critical mediator of angiogenesis.

Purpose of the Study:

  • To investigate the role of VEGF in human parathyroid cell-induced angiogenesis.
  • To evaluate VEGF production by parathyroid tissue in a 3D microvessel model.

Main Methods:

  • Human parathyroid tissue and cells were co-cultured with rat microvessels in a 3D collagen matrix.
  • VEGF(165) and FLT-1 soluble receptor fusion protein were used to modulate VEGF activity.

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  • Microvessel growth was quantified using image analysis after 11 days.
  • VEGF messenger RNA (mRNA) levels were assessed via reverse transcriptase-polymerase chain reaction.

    • Main Results:

    • Parathyroid tissue significantly increased microvessel growth compared to VEGF(165) alone.
    • VEGF(165) addition further augmented parathyroid-stimulated angiogenesis.
    • VEGF mRNA was rapidly induced in parathyroid explants, with a 12-fold increase within 24 hours.
    • Blocking VEGF with FLT-1 completely inhibited parathyroid-induced angiogenesis.

    Conclusions:

    • Human parathyroid tissue expresses and upregulates VEGF mRNA upon explantation.
    • VEGF is essential for mediating parathyroid-induced angiogenesis in this model.
    • Other parathyroid-derived factors likely contribute to angiogenesis.