The potential pathogenic effects of silica and carbon nanotubes (CNTs) on fibroblasts, macrophages/ monocytes, and T cells were investigated. Human macrophage/monocytes were cultured and stimulated with silica, CNTs, or titanium particles. After adding human T cells to the stimulated macrophages/ monocytes, the cells were added to cultured human fibroblasts. Upon microscopic examination, CNT stimulation after 24 hours showed centralization of macrophages/monocytes around the CNTs. Silica stimulation showed a significant increase of IL-1a and IL-1β in cultured medium, and an increased gene expression of CTGF in cultured fibroblasts at 1 hour, as well as an up-regulation of the COL1A2 gene at 24-hour time point. In addition to the same changes of IL-Iα, IL-1β and the COL1A2 by silica, CNT stimulation showed an increase of IL-8 in cultured medium at 1-hour time point. Titanium stimulation yielded no significant changes. The results indicate a proinflammatory and/or profibrotic effect of silica and CNTs to cultured human cells including macrophages/monocyte, T cells and fibroblasts.
|Original language||English (US)|
|Number of pages||7|
|Journal||International Journal of Immunopathology and Pharmacology|
|State||Published - 2012|
- Carbon nano tubes
ASJC Scopus subject areas
- Immunology and Allergy