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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.
Abstract:
Indoor exposure to microbial growth, caused by moisture damage, has been an established health risk for several decades. It is likely that a damp indoor environment contains biological pollutants that trigger both the innate and adaptive branches of the immune system. In this study, we investigated the association between moisture damage related microbial exposure and serum C3a, C5a and CRP concentrations in Finnish adults. Serum C3a and CRP concentrations were elevated in individuals exposed to moisture damage and microbial growth in an indoor air environment. The elevated concentrations may be due to environmental factors present in moisture-damaged buildings. Complement activation and the resulting proinflammatory cleavage products may be a driving factor in inflammatory responses following exposure to indoor moisture damage and related microbial growth.
Insights
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.
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.
