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Establishment of a mouse model for post-inflammatory hyperpigmentation.

Shoko Nakano1, Yuko Abe1, Kimiko Nakajima2

  • 1Department of Dermatology, Faculty of Medicine, Yamagata University, Yamagata, Japan.

Pigment Cell & Melanoma Research
|July 6, 2020
PubMed
Summary

Researchers developed a new animal model for post-inflammatory hyperpigmentation (PIH) by inducing the condition in hairless transgenic mice. This model aids in understanding PIH mechanisms and suggests macrophage-targeted treatments.

Keywords:
macrophagemelaninmelanocytemouse modelpigmentation

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Area of Science:

  • Dermatology
  • Immunology
  • Pathophysiology

Background:

  • Post-inflammatory hyperpigmentation (PIH) is a common skin condition with poorly understood pathophysiology.
  • A lack of appropriate animal models has hindered research into PIH mechanisms.

Purpose of the Study:

  • To establish a novel animal model for studying the pathomechanism of PIH.
  • To investigate the cellular and molecular changes associated with induced PIH.

Main Methods:

  • Induction of PIH in hairless transgenic mice (hk14-SCF Tg/HRM) using repeated hapten application (2,4-dinitrofluorobenzene).
  • Histopathological and immunohistochemical analyses of skin tissues.
  • Dynamic analysis of melanin distribution and duration.

Main Results:

  • Successfully induced an atopic dermatitis-like condition and subsequent PIH characteristics in the mouse model.
  • Observed epidermal hyperplasia, inflammatory cell infiltration, and increased dermal melanophages.
  • Melanin persisted longer in the dermis than epidermis; melanin-containing cells were primarily CD68-positive macrophages.

Conclusions:

  • The developed mouse model is suitable for PIH research.
  • Novel PIH treatments should target macrophages, potentially leading to new therapeutic strategies.