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A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors
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VEGFR2 dimerization kinetics on the cell surface determined by microscopy and mathematical modeling.

Jaime Guerrero1, Zachariah Malik1, Fnu Bilal1

  • 1Department of Biophysics, UT Southwestern Medical Center, Dallas, Texas.

Biophysical Journal
|June 23, 2026
PubMed
Summary

Researchers quantified receptor interaction kinetics for Vascular Endothelial Growth Factor Receptor 2 (VEGFR2) using live-cell single-molecule imaging and mathematical modeling. They found full-length VEGFR2 (FLR2) dimerizes more readily than a truncated mutant (ECTM), revealing key dimerization rate differences.

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Last Updated: Jun 24, 2026

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Studying the Stoichiometry of Epidermal Growth Factor Receptor in Intact Cells using Correlative Microscopy

Published on: September 11, 2015

Area of Science:

  • Cellular signaling and molecular interactions
  • Biophysics and quantitative biology
  • Membrane protein dynamics

Background:

  • Inter-receptor interactions are crucial for cell signaling.
  • Quantifying receptor kinetics (association/dissociation rates) is essential for modeling transmembrane signal transduction.
  • Live-cell single-molecule imaging (SMI) captures transient interactions but only for a labeled subset of receptors.

Purpose of the Study:

  • To infer population-level receptor interaction kinetics from SMI data using mathematical modeling.
  • To quantify the dimerization kinetics of Vascular Endothelial Growth Factor Receptor 2 (VEGFR2) in intact live cells.
  • To compare the dimerization kinetics of wildtype full-length VEGFR2 (FLR2) with a truncated mutant (ECTM).

Main Methods:

  • Developed a stochastic mathematical model for VEGFR2 diffusion and homotypic interactions.
  • Combined direct experimental measurements with stochastic model calibration to determine kinetic parameters.
  • Applied the model to analyze SMI data of FLR2 and ECTM.

Main Results:

  • Inferred population-level dimerization kinetics for VEGFR2.
  • Found that FLR2 exhibits substantial reversible dimerization, while ECTM is primarily monomeric.
  • Determined that the dimer association rate constant is approximately one order of magnitude higher for FLR2 than for ECTM.

Conclusions:

  • This study provides the first measurement of VEGFR2 dimerization kinetics (association and dissociation rate constants) in intact live cells.
  • The difference in homotypic interaction between FLR2 and ECTM is primarily due to a higher dimer association rate for FLR2.
  • Mathematical modeling combined with SMI is a powerful approach to compensate for limitations in imaging labeled receptor subsets and infer population-level kinetics.