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Related Concept Videos

Surface Membrane Barriers01:18

Surface Membrane Barriers

787
The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
787

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Related Experiment Video

Updated: May 20, 2025

Organotypic Tissue Model Systems for Investigating Host-Pathogen Interactions In Vitro
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Microbe-Host Interaction in Rosacea and Its Modulation through Topical Ivermectin.

Peter Olah1, Nina Reuvers1, Zoltan Radai1

  • 1Department of Dermatology, University Hospital Düsseldorf, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany.

The Journal of Investigative Dermatology
|April 12, 2025
PubMed
Summary

Topical ivermectin cream reduced Demodex mite density and improved rosacea symptoms by normalizing the host transcriptome, not the skin microbiome. This study clarifies rosacea

Keywords:
Demodex folliculorumIvermectinMicrobe–host interactionRosaceaSkin inflammation

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Area of Science:

  • Dermatology
  • Microbiology
  • Genomics

Background:

  • Rosacea is a common inflammatory skin condition significantly impacting quality of life.
  • The role of skin microbiome alterations (dysbiosis) and Demodex mite density in rosacea pathogenesis remains unclear.

Purpose of the Study:

  • To investigate the relationship between rosacea severity, Demodex mite density, skin microbiome, and host transcriptome.
  • To evaluate the effects of topical 1% ivermectin cream on these factors over 30 days.

Main Methods:

  • Systematic characterization of rosacea patients' mite density, microbiome, and transcriptome.
  • Comparison with healthy volunteers.
  • Analysis before and after 30 days of topical ivermectin treatment.

Main Results:

  • Topical ivermectin significantly decreased Demodex mite density in 87.5% of patients.
  • Distinct microbial changes were observed in rosacea patients, including decreased Cutibacterium acnes and increased Staphylococcus epidermidis.
  • Treatment normalized the host transcriptome, defining an 'ivermectin transcriptomic signature', without altering bacterial dysbiosis.

Conclusions:

  • Rosacea is associated with cutaneous dysbiosis.
  • Clinical improvement with topical ivermectin correlates with reduced mite density and normalized host transcriptome, not microbiome normalization.