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The plasminogen activator inhibitor system in bone cell function

E H Allan1, T J Martin

  • 1St Vincent's Institute of Medical Research, Fitzroy, Australia.

Clinical Orthopaedics and Related Research
|April 1, 1995
PubMed
Summary
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The plasminogen activator (PA)/plasmin pathway, involving urokinase-type PA (uPA) and tissue-type PA (tPA), plays a key role in bone remodeling. This pathway regulates osteoblast activity, influencing both bone formation and resorption.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Bone Biology

Background:

  • The plasminogen activator (PA)/plasmin system is crucial for tissue remodeling and cell migration.
  • Osteoblasts produce key components of this pathway: urokinase-type plasminogen activator (uPA), tissue-type plasminogen activator (tPA), plasminogen activator inhibitor-1 (PAI-1), and a uPA receptor.
  • While hormonal regulation of uPA, tPA, and PAI-1 is understood, the regulation of the uPA receptor remains unclear.

Purpose of the Study:

  • To explore the multifaceted roles of the PA/plasmin pathway in bone biology.
  • To investigate the proteolytic and non-proteolytic functions of uPA in osteoblasts.
  • To understand how this pathway integrates bone formation and resorption.

Main Methods:

  • Analysis of the PA/plasmin pathway components in osteoblasts.

Related Experiment Videos

  • Investigation of proteolytic activation of procollagenase and growth factors (TGF-beta, IGF).
  • Assessment of uPA's mitogenic effects on osteoblast-like cells, independent of its proteolytic activity.

    • Main Results:

    • The PA/plasmin pathway is involved in activating growth factors and procollagenase, and facilitating cell motility through pericellular proteolysis.
    • uPA exhibits mitogenic activity on osteoblast-like cells, a function mediated by its growth factor domain binding to its cellular receptor, independent of enzymatic function.
    • Differential regulation of uPA, tPA, and PAI-1 by osteotropic hormones and local factors suggests a tightly controlled system.

    Conclusions:

    • The PA/plasmin pathway is integral to bone remodeling, influencing both extracellular matrix modification and cell behavior.
    • uPA's dual role as a protease and a mitogen highlights its complex regulation and function in bone.
    • This pathway likely couples bone formation and resorption, maintaining skeletal homeostasis.