Effect of Fiber Length on Human Alveolar Macrophages
Author Information
Author(s): Zeidler-Erdely Patti C, Calhoun William J, Ameredes Bill T, Clark Melissa P, Deye Gregory J, Baron Paul, Jones William, Blake Terri, Castranova Vincent
Primary Institution: National Institute for Occupational Safety and Health
Hypothesis
Complete engulfment of fibers by human alveolar macrophages could decrease fiber cytotoxicity.
Conclusion
Human alveolar macrophages can completely engulf longer glass fibers without exhibiting length-dependent cytotoxicity.
Supporting Evidence
- Human alveolar macrophages completely engulfed 20 μm glass fibers.
- All fiber length fractions tested exhibited equal cytotoxicity on a per fiber basis.
- Human macrophages showed a concentration-dependent decrease in activation with increasing fiber concentration.
Takeaway
This study found that human immune cells can eat longer glass fibers without getting hurt, unlike rat cells.
Methodology
Human alveolar macrophages were treated with length-classified glass fibers and assessed for cytotoxicity using LDH release and chemiluminescence.
Limitations
The study did not address issues of fiber solubility and used a static rather than a flow system.
Participant Demographics
Six healthy male volunteers aged 20-40, non-smokers.
Statistical Information
Statistical Significance
p ≤ 0.05
Digital Object Identifier (DOI)
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