Summary
Silica induces a composite biological response, to analyse which culture technique are required as well as in vivo observations.
Uptake of quartz particles by macrophages constitutes the initial step and, to follow the sequence of events, phagocytosis took place in culture; after an interval the extract was transferred to fibroblasts grown independently and subsequently maintained for several days. The hydroxyproline and DNA contents of the fibroblasts were then estimated in both test and control experiments. Extract from the macrophage-quartz reaction stimulated hydroxyproline formation without affecting the DNA level. Production of the macrophage factor(s) evidently required particular conditions; viable and intact cells, quartz in particulate form, extraction from the cytosol or smaller subcellular elements, and membrane lability. Moreover, a dust that was non-fibrogenic in vivo was also without in vitro effect. The collagen stimulating factor(s) appeared to operate independently of the usual inflammatory or immunological responses.
The type II alveolar epithelium responded to quartz deposition by increased secretory and proliferative activity to such a degree that under appropriate conditions extensive alveolar lipo-proteinosis developed. This condition has been characterised histochemically, ultrastructurally, biochemically and biophysically, whilst a metabolic tracer study explained its proximate development.
In vivo the mesenchymal and epithelial responses operated con-currently and severe lipo-proteinosis excludes silicotic fibro-genesis by isolation of quartz particles from contact with alveolar macrophages. The genesis of lipo-proteinosis has accordingly been examined experimentally from physiological, therapeutic and environmental aspects.
Replenishment of macrophages under the destructive action of silica represents a further component of the biological response, and the process needs to be considered from the standpoints of local proliferation in the lung and systemic recruitment from the marrow.
Macrophage involvement in fibrogenesis is evidently not restricted to provocation by quartz.
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Heppleston, A.G. (1978). Cellular Reactions with Silica. In: Bendz, G., Lindqvist, I., Runnström-Reio, V. (eds) Biochemistry of Silicon and Related Problems. Nobel Foundation Symposia, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-4018-8_17
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