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Immune development and environment: lessons from Amish and Hutterite children.

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Area of Science:

  • Environmental Health
  • Immunology
  • Pediatrics

Background:

  • Traditional farm environments offer protection against asthma and allergy in children, a phenomenon known as the 'farm effect'.
  • Early life exposure to farm animals, particularly cows, and their associated microbes is believed to be a key factor in this protective effect.
  • Innate immune pathways are implicated in mediating this protection, as suggested by studies in diverse farming communities.

Purpose of the Study:

  • To investigate the mechanisms behind the asthma-protective 'farm effect' by comparing Amish and Hutterite children.
  • To analyze how differences in farming practices influence endotoxin exposure, asthma prevalence, and immune cell function.
  • To synthesize findings from Amish and Hutterite children with existing research on European farm children to advance understanding of the 'farm effect'.

Main Methods:

  • Comparative study of Amish and Hutterite school children with similar ancestry but different farming practices.
  • Assessment of house dust endotoxin levels in relation to asthma and atopy prevalence.
  • Analysis of immune cell proportions, phenotypes, and functions in children from both communities.
  • Review of previous studies on European farm children to contextualize findings.

Main Results:

  • Profound differences in house dust endotoxin levels were observed between Amish and Hutterite communities.
  • Correspondingly, significant variations in asthma and atopy prevalence were found among the school children.
  • Distinct differences in the composition, characteristics, and activity of immune cells were identified between the two groups.
  • These findings support the role of innate immunity in mediating the protective 'farm effect'.

Conclusions:

  • Farming practices significantly impact environmental exposures, such as endotoxin levels, which in turn influence immune development and protection against allergies.
  • The 'farm effect' is mediated through innate immune pathways, with microbial exposures playing a crucial role.
  • Understanding these mechanisms can inform strategies to prevent asthma and allergies in children, even in non-farm settings.