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Updated: Jan 18, 2026

Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale
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Tick Extracellular Vesicles Alter Epidermal Keratinocyte Function.

Liron Marnin1, Luisa M Valencia1, Haikel N Bogale2

  • 1Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA.

The Journal of Investigative Dermatology
|September 7, 2025
PubMed
Summary
This summary is machine-generated.

Ticks use extracellular vesicles to disrupt wound healing for prolonged feeding. This study reveals how these vesicles interfere with skin cell repair, aiding tick survival and blood meal acquisition.

Keywords:
ModelsMouseWound healing

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Area of Science:

  • Dermatology
  • Parasitology
  • Molecular Biology

Background:

  • Wound healing research primarily focuses on inflammation and cancer, neglecting hematophagy and arthropod-borne diseases.
  • Hematophagous ectoparasites like ticks manipulate host wound healing for prolonged attachment and feeding.

Purpose of the Study:

  • To investigate the role of extracellular vesicles in tick feeding and survival.
  • To understand how ticks subvert cutaneous wound healing mechanisms.

Main Methods:

  • Single-cell RNA sequencing in murine models.
  • Murine genetics to study tick-host interactions.
  • In vitro scratch assays with keratinocytes.

Main Results:

  • Reduced extracellular vesicle production in ticks led to a distinct epidermal subpopulation in mice with enhanced wound healing pathways.
  • Tick extracellular vesicles inhibited keratinocyte proliferation and reduced gap closure capacity.
  • Inhibition was linked to phosphoinositide 3-kinase activity, keratinocyte growth factor 1, and TGF-β signaling.

Conclusions:

  • Ticks employ extracellular vesicles as a strategy to disrupt cutaneous wound healing.
  • This disruption enhances ectoparasite fitness by ensuring successful blood feeding.
  • The findings shed light on the molecular mechanisms of tick-host interactions in wound environments.