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In-vitro Biological Study to Evaluate the Toxic Potentials of Fibrous Materials
1Department of Health Policy and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, 1-1 Iseigaoka, Kitakyushu 807, Japan.
Abstract:
The potential toxicities of fibrous materials were investigated by measuring the levels of cytokines as well as cytoplasmic and lysosomal enzymes released from alveolar macrophages (AMs) in vitro. Five man-made mineral fibers (ceramic, glass, potassium octatitanate, and two magnesium sulfate whiskers), as well as five natural mineral fibers (UICC chrysotile, crocidolite, amosite, anthophylite, and Turkish erionite) were tested. Basic fiber characteristics, including fiber size, surface area, number, and solubility, were also measured. Tumor necrosis factor (TNF) production, lactate dehydrogenase (LDH) and beta-glucuronidase (BGU) release from AMs exposed to potassium octatitanate, magnesium sulfate whiskers, and ceramic fiber correlated with pathologic changes in the lung according to inhalation studies. The solubility of the man-made mineral fibers also correlated with the half-life of clearance in an in-vivo study. The results suggest that measured values of TNF production, LDH and BGU release in vitro, and fiber solubility combined are a good indicator of the pathogenic potential of fibers in vivo.
Insights
This study assessed the toxicity of various mineral fibers using in vitro cytokine and enzyme release from alveolar macrophages. Fiber solubility and specific markers accurately predict the pathogenic potential of fibers in vivo.
Area of Science:
- Toxicology
- Materials Science
- Cell Biology
Background:
- Fibrous materials, both natural and man-made, pose potential health risks.
- Assessing the pathogenicity of these fibers is crucial for occupational and environmental safety.
Purpose of the Study:
- To investigate the toxic potential of various man-made and natural mineral fibers.
- To correlate in vitro measurements with in vivo pathological outcomes.
Main Methods:
- Tested five man-made and five natural mineral fibers.
- Measured fiber characteristics: size, surface area, number, and solubility.
- Quantified cytokine (TNF) and enzyme (LDH, BGU) release from alveolar macrophages (AMs) in vitro.
- Correlated in vitro results with in vivo inhalation studies and clearance half-life.
Main Results:
- Tumor necrosis factor (TNF) production, lactate dehydrogenase (LDH), and beta-glucuronidase (BGU) release from AMs exposed to certain fibers correlated with lung pathology.
- Man-made mineral fiber solubility correlated with in vivo clearance rates.
- Combined in vitro markers and fiber solubility effectively indicated pathogenic potential.
Conclusions:
- In vitro measurements of TNF, LDH, and BGU release, along with fiber solubility, serve as reliable indicators of a fiber's in vivo pathogenic potential.
- This approach aids in evaluating the risks associated with different fibrous materials.