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Infecting Mice with Malassezia spp. to Study the Fungus-Host Interaction
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Malassezia species and their associated skin diseases

Kazutoshi Harada1, Mami Saito, Takashi Sugita

  • 1Department of Dermatology, Tokyo Medical University, Tokyo, Japan.

The Journal of Dermatology
|March 5, 2015
PubMed

Insights

Malassezia yeasts are dominant skin fungi implicated in various skin conditions. Research reviews their role in diseases like seborrheic dermatitis and atopic dermatitis, highlighting incomplete understanding of their inflammatory mechanisms.

Area of Science:

  • Dermatology
  • Mycology
  • Human Microbiome

Background:

  • Malassezia species are lipophilic fungi found on human and animal skin, acting as both commensals and pathogens.
  • Recent discoveries have expanded the Malassezia genus to 14 species, with molecular analyses confirming their dominance in human skin fungal flora.
  • Malassezia is linked to skin diseases such as pityriasis versicolor (PV), Malassezia folliculitis (MF), seborrheic dermatitis (SD), and atopic dermatitis (AD).

Purpose of the Study:

  • To review the latest research on Malassezia species.
  • To focus on the pathogenetic role of Malassezia in skin diseases, particularly seborrheic dermatitis and atopic dermatitis.
  • To highlight the current understanding and gaps in knowledge regarding Malassezia-induced skin inflammation.

Main Methods:

  • Literature review of recent Malassezia research.
  • Analysis of studies investigating Malassezia's role in pityriasis versicolor, Malassezia folliculitis, seborrheic dermatitis, and atopic dermatitis.
  • Examination of findings from patch tests and serum immunoglobulin E tests in atopic dermatitis patients.

Main Results:

  • Malassezia species are directly causative in pityriasis versicolor and Malassezia folliculitis.
  • Malassezia acts as an exacerbating factor in seborrheic dermatitis and atopic dermatitis, with its lipase-generated fatty acids potentially inducing inflammation.
  • Atopic dermatitis patients exhibit hypersensitivity to Malassezia, though the precise inflammatory mechanisms remain unclear.

Conclusions:

  • While Malassezia's role in specific skin infections is established, its contribution to inflammatory conditions like seborrheic dermatitis and atopic dermatitis requires further elucidation.
  • Understanding the complex interactions between Malassezia and the host immune system is crucial for developing effective treatments for associated skin diseases.
  • Continued research into Malassezia pathogenesis is essential to fully comprehend its impact on skin health and disease.
Keywords:
MalasseziaMalassezia folliculitisatopic dermatitispityriasis versicolorseborrheic dermatitis

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