Modeling antigen-specific T cell dynamics following Hepatitis B Vaccination indicates differences between...

Area of Science:

• Immunology
• Mathematical Biology
• Vaccinology

Background:

• Understanding T cell dynamics post-vaccination is crucial for effective immunization strategies.
• Conventional memory T cells (Tconv) and regulatory memory T cells (Treg) play distinct roles in immune responses.
• Inter-individual variability complicates the analysis of T cell kinetics.

Purpose of the Study:

• To investigate the dynamics of Tconv and Treg cells following vaccination.
• To identify differences in the behavior of Tconv and Treg cells.
• To explore the relationship between T cell dynamics, seropositivity for common viruses, and antibody response to vaccination.

Main Methods:

• Development of advanced statistical mixed models based on ordinary differential equations (ODE).
• Application of models to in-house data from a Hepatitis B vaccination trial.
• Accounting for inter- and intra-individual variability to fit Tconv and Treg cell data.

Main Results:

• Tconv cell dynamics suggested two distinct cell types, whereas Treg dynamics indicated only one.
• Earlier vaccine antibody responders exhibited lower decay rates for both Tconv and Treg cells.
• Herpes Simplex Virus Type 1 (HSV-1) seropositivity reduced Tconv expansion, while Epstein-Barr Virus (EBV) seropositivity increased Treg expansion.

Conclusions:

• The study provides a mathematical framework for understanding T cell development post-vaccination.
• Findings offer insights into factors influencing T cell responses and antibody production.
• Results may inform the design of more effective vaccination strategies by considering T cell kinetics and viral serostatus.