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Integrated Inflammatory Stress (ITIS) Model.

Elisabeth O Bangsgaard1, Poul G Hjorth1, Mette S Olufsen2

  • 1Department of Applied Mathematics and Computer Science, Technical University of Denmark, Lyngby, Denmark.

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Summary
This summary is machine-generated.

A new integrated inflammatory stress (ITIS) model describes the interaction between acute inflammation and the Hypothalamic-Pituitary-Adrenal (HPA) axis. The model accurately simulates human data and suggests repeated endotoxin exposure causes HPA axis deficiency.

Keywords:
Acute inflammatory systemHPA axisImmune systemMathematical modelingNonlinear ODE modelResponse to endotoxin (LPS)

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Area of Science:

  • Immunology
  • Endocrinology
  • Systems Biology

Background:

  • The interplay between acute inflammation and the Hypothalamic-Pituitary-Adrenal (HPA) axis is of growing research interest.
  • Cortisol, a key hormone regulated by the HPA axis, possesses anti-inflammatory properties, highlighting a crucial feedback loop.

Purpose of the Study:

  • To propose and formulate a novel integrated model, termed the Integrated Inflammatory Stress (ITIS) model, to describe the interaction between inflammatory responses and the HPA axis.
  • To validate the ITIS model using biological reasoning and clinical data, specifically focusing on endotoxin (LPS) exposure scenarios.

Main Methods:

  • Development of the ITIS model based on biological mechanisms governing the inflammatory response and HPA axis.
  • Calibration and validation of the model through simulations of endotoxin (LPS) exposure in humans.
  • Comparison of model outputs with human data for tumor necrosis factor alpha, adrenocorticotropic hormone (ACTH), and cortisol levels.

Main Results:

  • The ITIS model successfully reproduced human data for key inflammatory and hormonal markers (TNF-alpha, ACTH, cortisol).
  • Simulations indicated that repeated LPS injections result in a diminished HPA axis response.
  • The model predicts maximal ACTH and cortisol responses to LPS occur in the early morning hours.

Conclusions:

  • The ITIS model provides a robust framework for understanding the integrated response to inflammatory stimuli and HPA axis function.
  • The model suggests potential HPA axis dysfunction following repeated inflammatory challenges.
  • Timing of inflammatory insults may significantly influence the physiological response, as predicted by the ITIS model.