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Related Experiment Videos

Factor VIIa binding and internalization in hepatocytes.

G Hjortoe1, B B Sorensen, L C Petersen

  • 1Health Care Discovery, Novo Nordisk, Maalov, Denmark.

Journal of Thrombosis and Haemostasis : JTH
|October 1, 2005
PubMed
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Liver cells clear factor VIIa (FVIIa), but mechanisms were unknown. This study shows primary hepatocytes internalize FVIIa via membrane turnover, unlike hepatoma cells, revealing key liver clearance insights.

Area of Science:

  • Hepatology
  • Coagulation Science
  • Cell Biology

Background:

  • The liver is the primary organ for clearing coagulation proteases like factor VIIa (FVIIa).
  • The specific mechanisms of FVIIa clearance within the liver remain largely unknown.
  • Understanding FVIIa clearance is crucial for managing coagulation disorders.

Purpose of the Study:

  • To investigate the binding and internalization mechanisms of FVIIa in liver cells.
  • To compare FVIIa clearance in a human hepatoma cell line (HEPG2) versus primary rat and human hepatocytes.
  • To elucidate the role of tissue factor and phosphatidylserine in FVIIa uptake.

Main Methods:

  • Utilized radiolabeled 125I-FVIIa to study binding kinetics in HEPG2 cells and primary hepatocytes.
  • Investigated the effect of anti-tissue factor antibodies and excess unlabeled FVIIa on binding.

Related Experiment Videos

  • Assessed FVIIa internalization rates and the impact of annexin V and gla-domain-deleted FVIIa.

    • Main Results:

    • FVIIa binding to HEPG2 cells was partially dependent on tissue factor, while binding to primary hepatocytes was independent.
    • Primary rat and human hepatocytes exhibited significantly higher FVIIa binding and faster internalization rates compared to HEPG2 cells.
    • Annexin V blocked FVIIa binding and internalization, and gla-domain-deleted FVIIa showed diminished binding, suggesting phosphatidylserine involvement.

    Conclusions:

    • Significant differences exist in FVIIa binding and internalization between hepatoma cell lines and primary hepatocytes.
    • Primary hepatocytes appear to internalize FVIIa through rapid membrane turnover rather than classical receptor-mediated endocytosis.
    • These findings provide novel insights into the hepatic clearance mechanisms of coagulation factors.