Factor VIII-eGFP fusion proteins with preserved functional activity for the analysis of the early secretory pathway of factor VIII

Thromb Haemost. 2009 Nov;102(5):925-35. doi: 10.1160/TH08-12-0807.

Abstract

Considering the difficulty in detecting factor (F)VIII in vivo, fluorescently labelled FVIII protein provides a tool to analyse the intracellular localisation, bio distribution, and pharmacokinetics of the protein in living organisms. Here, we report the use of FVIII full length and B-domain deleted proteins, fused to enhanced green fluorescent protein (eGFP) at the C-terminus of the coagulation protein via a nine amino acid spanning linker. Comparison of the FVIII-eGFP fusion proteins to their unlabelled counterparts showed no impairment with respect to recombinant expression levels, intracellular processing, specific coagulant activity and decay at physiological temperature. Confocal live cell imaging demonstrated ER-Golgi-transport of B-domain deleted FVIII-eGFP in vesicular tubular carriers. Using temperature blocks and release experiments, imaging of FVIII-eGFP fusion proteins enabled for the first time the visualisation of the early secretory pathway of B-domain deleted FVIII in living cells and in particular highlighted the apparent deficit of active transport carriers, an observation consistent with the low rates of FVIII secretion seen in recombinant expression systems.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Blood Coagulation / drug effects
  • CHO Cells
  • COS Cells
  • Cell Line
  • Chlorocebus aethiops
  • Cricetinae
  • Cricetulus
  • Endoplasmic Reticulum / metabolism
  • Factor VIII / chemistry
  • Factor VIII / genetics
  • Factor VIII / metabolism
  • Factor VIII / pharmacology*
  • Factor VIIIa / analysis
  • Golgi Apparatus / metabolism
  • Green Fluorescent Proteins / genetics*
  • Humans
  • Models, Molecular
  • Peptide Fragments / chemistry
  • Peptide Fragments / metabolism
  • Peptide Fragments / pharmacology
  • Protein Conformation
  • Protein Structure, Tertiary
  • Protein Transport
  • Recombinant Fusion Proteins / chemistry
  • Recombinant Fusion Proteins / pharmacology

Substances

  • Peptide Fragments
  • Recombinant Fusion Proteins
  • enhanced green fluorescent protein
  • Green Fluorescent Proteins
  • Factor VIIIa
  • F8 protein, human
  • Factor VIII