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Collection and Extraction of Occupational Air Samples for Analysis of Fungal DNA
Published on: May 2, 2018
Adverse health effects of indoor moulds
1Slovak Medical University, Bratislava, Slovakia.
Abstract:
Building associated illnesses - sick building syndrome (SBS) as a common example - are associated with staying in buildings with poor indoor air quality. The importance of indoor fungal growth in this phenomenon continues to be evident, even though no causative relation has been established so far. Indoor humidity is strongly associated with the symptoms of SBS. Fungal metabolites that may induce ill health in susceptible occupants comprise beta-D-glucan, mycotoxins, and volatile organic compounds as known irritants and/or immunomodulators. Indoor toxic fungal metabolites might be located in micromycetal propagules (endometabolites), in (bio-)aerosol, detritus, and house dust (exometabolites) as their particular carriers. It is highly probable that hyphal fragments, dust, and particles able to reach the alveoli have the strongest depository and toxic potential. Most fungal spores are entrapped by the upper respiratory tract and do not reach further than the bronchi because of their size, morphology, and the mode of propagation (such as slime heads and aggreggation). This is why studies of the toxic effects of fungal spores prefer directly applying metabolite mixtures over mimicking real exposure. Chronic low-level exposure to a mixture of fungal toxicants and other indoor stressors may have synergistic effects and lead to severe neuroendocrineimmune changes.
Insights
Poor indoor air quality in buildings is linked to illnesses like sick building syndrome (SBS). Fungal growth and its toxic metabolites, such as beta-D-glucan and mycotoxins, are key contributors to these health issues.
Area of Science:
- Environmental Health
- Mycology
- Toxicology
Background:
- Sick Building Syndrome (SBS) is linked to poor indoor air quality.
- Indoor humidity is a significant factor associated with SBS symptoms.
- Indoor fungal growth is increasingly recognized as a contributor to building-associated illnesses.
Purpose of the Study:
- To explore the role of fungal metabolites in building-associated illnesses.
- To identify the carriers and toxic potential of fungal metabolites in indoor environments.
- To understand the impact of chronic low-level exposure to fungal toxicants.
Main Methods:
- Analysis of fungal metabolites (beta-D-glucan, mycotoxins, VOCs) found in indoor environments.
- Investigation of fungal propagules, aerosols, detritus, and house dust as metabolite carriers.
- Consideration of particle deposition in the respiratory tract, from upper airways to alveoli.
Main Results:
- Fungal metabolites like beta-D-glucan, mycotoxins, and VOCs act as irritants and immunomodulators.
- Micromycetal propagules, aerosols, detritus, and house dust carry toxic fungal metabolites.
- Particles reaching the alveoli possess the highest toxic potential, while larger spores are often trapped in the upper respiratory tract.
Conclusions:
- Fungal metabolites are significant contributors to building-associated illnesses.
- Understanding the carriers and deposition of fungal toxicants is crucial for assessing health risks.
- Chronic exposure to mixed fungal toxicants and indoor stressors may lead to synergistic adverse health effects, including neuroendocrine-immune changes.
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