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Rewilding mice outdoors boosted brain cell growth and altered immune cells. However, only outdoor living combined with a worm infection increased anxiety behaviors in mice.

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Area of Science:

  • Neuroscience
  • Immunology
  • Behavioral Science

Background:

  • The interplay between environmental factors, immune responses, and behavior is complex.
  • Studies on rewilded laboratory mice offer insights into these interactions.

Purpose of the Study:

  • To investigate the effects of outdoor living and parasitic infection on neurogenesis, microglia, and anxiety in mice.
  • To understand how environmental enrichment combined with immune challenge influences brain and behavior.

Main Methods:

  • Exposing laboratory mice to outdoor environments.
  • Introducing peripheral worm infection in some mice exposed to outdoor conditions.
  • Assessing adult neurogenesis, microglial changes, and anxiety-like behaviors.

Main Results:

  • Outdoor living, with or without worm infection, increased adult neurogenesis.
  • Both outdoor living and worm infection significantly affected microglia.
  • Only mice exposed to outdoor living coupled with worm infection exhibited increased anxiety.

Conclusions:

  • Environmental enrichment (outdoor living) can promote neurogenesis and modulate immune cells.
  • Parasitic infection can exacerbate anxiety-related behaviors, particularly when combined with environmental changes.
  • The study highlights a specific interaction between environmental exposure and immune challenge in shaping anxiety.