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Related Experiment Videos

Cellular localization and trafficking of tissue factor.

Samir K Mandal1, Usha R Pendurthi, L Vijaya Mohan Rao

  • 1Biomedical Research Division, The University of Texas Health Center at Tyler, TX 75708, USA.

Blood
|February 24, 2006
PubMed
Summary

Tissue factor (TF) is primarily intracellular, mainly in the Golgi. FVIIa binding triggers TF mobilization to the cell surface, enhancing TF activity for hemostasis.

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Area of Science:

  • Cell biology
  • Hemostasis
  • Molecular mechanisms of coagulation

Background:

  • Tissue factor (TF) acts as the cellular receptor for clotting factor VIIa (FVIIa).
  • TF-FVIIa complex formation initiates the coagulation cascade and cellular signaling pathways.
  • Understanding TF's subcellular localization and transport is crucial for comprehending its role in hemostasis.

Purpose of the Study:

  • To investigate the subcellular distribution and transport dynamics of Tissue Factor (TF) in fibroblasts.
  • To elucidate the mechanism of TF mobilization to the cell surface upon FVIIa binding.
  • To determine the role of FVIIa protease activity in TF expression at the cell surface.

Main Methods:

  • Dual immunofluorescence confocal microscopy was employed to visualize TF localization.
  • Biochemical methods were utilized to analyze TF transport and expression.
  • Analysis of TF colocalization with specific cellular markers like caveolin-1.

Main Results:

  • The majority of TF was found in intracellular compartments, predominantly the Golgi apparatus.
  • Cell surface TF is localized within cholesterol-rich lipid rafts and colocalizes with caveolin-1.
  • FVIIa binding induced TF internalization and subsequent mobilization from the Golgi to the cell surface, dependent on FVIIa protease activity.

Conclusions:

  • A novel mechanism for TF cell surface expression mediated by FVIIa was identified.
  • FVIIa binding triggers TF mobilization from the Golgi, increasing cell surface TF levels.
  • This FVIIa-dependent TF expression mechanism may be vital for hemostasis following vascular injury.

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