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American Journal of Pathology, Vol 137, 121-134, Copyright © 1990 by American Society for Investigative Pathology

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The formation of asbestos bodies by mouse peritoneal macrophages. An in vitro study

HK Koerten, JD de Bruijn and WT Daems
Laboratory for Electron Microscopy, University of Leiden, The Netherlands.

For studies on the mechanism of asbestos body formation, Union Internationale Contre Cancer (UICC) crocidolite asbestos fibers were added to a culture of mouse peritoneal macrophages. Small asbestos fibers were totally ingested by the macrophages, but fibers too long to be taken up completely remained as a consequence extracellular. These long asbestos fibers became the basis for asbestos body formation. The basic mechanism underlying asbestos body formation was found to be the exocytotic activity of macrophages. The number of iron-rich inclusion bodies was dependent on the availability of iron in the culture media, and the same holds for the amount of iron in the asbestos body coat. This means that asbestos body formation is a phenomenon that occurs accidentally when macrophages come into contact with long fibers in an iron-rich environment. A time-dependent increase in the number, average size, and rate of segmentation of the asbestos bodies was observed. The present report is the first to describe asbestos body formation in vitro.


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P. DUMORTIER, I. BROUCKE, and P. DE VUYST
Pseudoasbestos Bodies and Fibers in Bronchoalveolar Lavage of Refractory Ceramic Fiber Users
Am. J. Respir. Crit. Care Med., August 1, 2001; 164(3): 499 - 503.
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Copyright © 1990 by the American Society for Investigative Pathology.