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Modelling epidermis homoeostasis and psoriasis pathogenesis.

Hong Zhang1, Wenhong Hou2, Laurence Henrot3

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Summary

This study introduces a computational model for epidermis homeostasis, simulating normal and pathological conditions like psoriasis. The model predicts two psoriasis modes, offering insights into disease recurrence and phototherapy effectiveness.

Keywords:
bimodal switchepidermal homoeostasisimmune systemmathematical modelpsoriasis

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Area of Science:

  • Computational biology
  • Dermatology
  • Biophysics

Background:

  • Epidermis homeostasis is crucial for skin health, involving complex keratinocyte dynamics.
  • Psoriasis is a chronic inflammatory skin condition characterized by aberrant keratinocyte proliferation and differentiation.

Purpose of the Study:

  • To develop a computational model simulating epidermis homeostasis under normal and pathological conditions.
  • To investigate the spatio-temporal dynamics of psoriasis, including its onset, recurrence, and remission.

Main Methods:

  • A hybrid model combining population kinetics for keratinocyte pathways and an agent-based model for cell movement.
  • Simulation of keratinocyte proliferation, differentiation, and loss within a stratified epidermis structure.
  • Modeling psoriasis as parallel homeostatic processes of normal and psoriatic keratinocytes from a shared stem cell niche.

Main Results:

  • The model successfully recapitulates normal epidermal cell density, turnover time, and tissue structure.
  • Two distinct homeostatic modes for psoriasis were predicted: a disease mode and a quiescent mode.
  • Interconversion between modes is influenced by stem cell niche competition and immune system interactions.

Conclusions:

  • The computational model provides a framework for understanding epidermis homeostasis and psoriasis dynamics.
  • The predicted quiescent state offers a potential explanation for phototherapy efficacy and psoriasis recurrence.
  • Findings can guide the development of targeted therapeutics for psoriasis by modulating immune interactions and keratinocyte behavior.