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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • The plasminogen activation system (PAS) regulates extracellular protease plasmin activity.
  • PAS components include urokinase plasminogen activator (uPA), its inhibitor PAI1, and receptor uPAR.
  • PAS is crucial in tissue remodeling and extracellular matrix degradation, impacting physiological and pathological processes.

Purpose of the Study:

  • To investigate the role of uPA, PAI1, and uPAR in cellular processes.
  • To analyze the effects of overexpressing these PAS components in glioblastoma and HEK 293 cells.

Main Methods:

  • Cloning and overexpression of human uPA, PAI1, and uPAR in A1235 and HEK 293 cell lines.
  • Analysis of urokinase activity, protein, and RNA expression via Western blot and RTqPCR.
  • Assessment of cell proliferation, migration, invasion, adhesion, and dispersal using cell counting, wound-healing, transwell, and spheroid formation assays.

Main Results:

  • Transfection with uPA increased urokinase activity and uPA expression.
  • PAI1 transfection decreased urokinase activity, increased PAI1 expression, and reduced cell migration.
  • HEK 293 cells expressing PAI formed smaller spheroids.

Conclusions:

  • The effects of uPA system molecules are interdependent and influenced by the microenvironment.
  • Cell-type-specific signaling plays a role in the observed effects of the uPA system.