The CD4+ T cell regulatory network mediates inflammatory responses during acute hyperinsulinemia: a simulation study

Area of Science:

• Immunology
• Systems Biology
• Computational Biology

Background:

• Obesity is linked to insulin resistance, inflammation, and altered CD4+ T cell function.
• System-level mechanisms driving CD4+ T cell differentiation and plasticity in obesity remain unclear.

Purpose of the Study:

• To model how hyperinsulinemia affects CD4+ T cell regulatory networks.
• To understand the impact of insulin on cell differentiation and plasticity under various microenvironments.

Main Methods:

• Simulated different polarizing microenvironments under basal and high insulin conditions.
• Assessed cell-fate attainment and robustness to perturbations using a dynamic systems model.

Main Results:

• High insulin stabilizes Th1 and Th17 cells, augmenting their stability and basin sizes.
• Tr1 cells become less stable or disappear under high insulin; TGFβ-producing cells are unaffected.
• Simulations predict coexistence of effector and regulatory cells in certain environments, but high insulin diminishes regulatory cells, especially in pro-Th17 settings.

Conclusions:

• This study offers a dynamic, system-level framework for understanding complex inflammatory diseases.
• Provides insights into the role of TGFβ and the emergence of adipose regulatory T cells (Tregs).
• Highlights the impact of microenvironment and insulin on immune cell coexistence and function.