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Indoor microbial exposure increases complement component C3a and C-reactive protein concentrations in serum.

Outi Karhuvaara1,2, Liisa Vilén2, Jari Nuutila1

  • 1The Laboratory of Immunochemistry, Department of Biotechnology, Faculty of Science and Engineering, University of Turku, Turku, Finland.

Heliyon
|January 31, 2024
PubMed
Summary

Exposure to indoor microbial growth from moisture damage elevates specific immune markers. This study found higher serum C3a and C-reactive protein (CRP) in adults exposed to damp indoor environments, suggesting a link to inflammation.

Keywords:
AnaphylatoxinsC-reactive proteinComplementInflammationMoisture damage

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Area of Science:

  • Environmental Health
  • Immunology
  • Toxicology

Background:

  • Indoor moisture damage is a known health risk linked to microbial growth.
  • Damp indoor environments harbor biological pollutants that activate the immune system.

Purpose of the Study:

  • To investigate the association between indoor microbial exposure from moisture damage and specific serum inflammatory markers in Finnish adults.
  • To explore the role of complement activation in inflammatory responses to indoor dampness.

Main Methods:

  • The study analyzed serum concentrations of C3a, C5a, and C-reactive protein (CRP).
  • Participants were Finnish adults with varying levels of indoor moisture damage exposure.
  • Correlations between environmental exposure and biomarker levels were assessed.

Main Results:

  • Serum C3a and CRP concentrations were significantly elevated in individuals exposed to moisture damage and microbial growth.
  • Elevated levels suggest a biological response to environmental factors in damp buildings.
  • Complement activation products (C3a, C5a) may play a role in inflammation.

Conclusions:

  • Indoor microbial exposure due to moisture damage is associated with elevated inflammatory markers (C3a, CRP).
  • These findings suggest complement activation is a key mechanism in the inflammatory response to damp indoor environments.
  • Reducing indoor moisture damage is crucial for mitigating associated health risks.