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Distinct Dynamics of Migratory Response to PD-1 and CTLA-4 Blockade Reveals New Mechanistic Insights for Potential

Fateme Safaeifard1, Bahram Goliaei1, Amir R Aref2,3

  • 1Laboratory of Biophysics and Molecular Biology, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran 1417614411, Iran.

Cells
|November 26, 2022
PubMed

Insights

Cytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) and programmed cell death protein 1 (PD-1) are key cancer immunotherapy targets. Mathematical modeling revealed CTLA-4 dominance over PD-1 due to PD-1

Area of Science:

  • Immunology
  • Computational Biology
  • Cancer Research

Background:

  • Cytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) and programmed cell death protein 1 (PD-1) are critical negative regulators of T-cell activation and migration.
  • These immune checkpoints are clinically significant targets for cancer immunotherapy.
  • Understanding their coordinated function is crucial for optimizing therapeutic responses to immune checkpoint blockade.

Purpose of the Study:

  • To investigate and statistically characterize T-cell migration dynamics in response to anti-CTLA-4 and anti-PD-1 antibody treatment.
  • To elucidate the distinct regulatory mechanisms and contributions of CTLA-4 and PD-1 to immune modulation using mathematical modeling.
  • To explain the differential immunostimulatory patterns of PD-1 and CTLA-4 blockade.

Main Methods:

  • Utilized a three-dimensional organotypic culture model of patient-derived tumor spheroids.
  • Treated spheroids with anti-CTLA-4 and anti-PD-1 antibodies.
  • Employed experiment-based dynamical mathematical modeling to analyze T-cell migration and immune cell counts.

Main Results:

  • Mathematical modeling revealed delayed kinetics of PD-1 activation compared to CTLA-4.
  • Simulation results showed good agreement with experimental data on tumor cell reduction and active immune cell counts.
  • Despite PD-1's intracellular cascade, its delayed activation kinetics confer functional dominance to the CTLA-4 checkpoint at the individual cell level.

Conclusions:

  • The study explains the distinct immunostimulatory patterns of PD-1 and CTLA-4 blockade based on their regulatory mechanisms.
  • The delayed kinetics of PD-1 activation influences its functional dominance over CTLA-4.
  • The developed model can aid in planning effective treatment strategies targeting PD-1 and CTLA-4 functions in cancer immunotherapy.
Keywords:
T-cell migrationdelayed dynamicsheterogeneous random walksimmune checkpoint blockadeorganotypic tumor culturetumor–immune interaction

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