Innate Type 2 Immunity Controls Hair Follicle Commensalism by Demodex Mites

    August 2022 in “ Immunity ”
    Roberto R. Ricardo-González, Maya E. Kotas, Claire E. O’Leary, Katelyn Singh, William Damsky, Chang Liao, Elizabeth Arouge, Iliana Tenvooren, Diana M. Marquez, Andrew Schroeder, Jarish N. Cohen, Marlys S. Fassett, Jinwoo Lee, Scott G. Daniel, Kyle Bittinger, Roberto Efraín Díaz, James S. Fraser, Niwa Ali, K. Mark Ansel, Matthew H. Spitzer, Hong-Erh Liang, Richard M. Locksley
    TLDR Type 2 immunity helps control mite growth in hair follicles, preventing damage.
    The study explores the role of innate type 2 immunity in regulating Demodex mite colonization in hair follicles, emphasizing the importance of group 2 innate lymphoid cells (ILC2s) and interleukin-13 (IL-13) in maintaining skin homeostasis. In type 2 immunodeficient mice, the absence of these immune components leads to increased mite proliferation, inflammation, and hair follicle exhaustion, resembling human rhinophyma. The research suggests that type 2 immunity, particularly through IL-13 and ILC2s, is crucial for preventing pathological mite overgrowth and maintaining hair follicle integrity, highlighting potential benefits of targeted screening and treatments for managing Demodex-related skin conditions.
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