Techniques for microscopic detection of asbestos bodies in lung tissue

Our plain-English summary of Techniques for microscopic detection of asbestos bodies in lung tissue, by P. Bradbury (Biotechnic & Histochemistry, 2005).

The study

• Author: P. Bradbury
• Journal: Biotechnic & Histochemistry
• Published: 2005;80(3-4):169-70
• Read it: PubMed · Publisher

In plain English

This item is not a research study but an answer, in a journal's question-and-answer section, to a reader asking how to detect asbestos fibers in lung tissue. The author described methods chosen in an earlier asbestosis-mesothelioma project in England that examined tissues from several hundred autopsies. That project involved elderly women, mostly housewives, who handled powdered asbestos assembling gas masks during the Second World War, sometimes for only two weeks, and developed asbestos-associated diseases some 25 to 30 years later. The author reported that some patients had many fibers but no asbestos bodies, and that certain unnamed asbestos types were more likely to cause mesothelioma. Fluid squeezed from fresh lung was treated with 1% saponin, centrifuged and examined unstained, with polarized light for fibers. Sections of fixed, paraffin-embedded tissue had the wax removed with xylene and were examined unstained by bright field and polarized light. The author found microincineration time-consuming and unreliable, and concluded that asbestos bodies need no special stain to confirm them. Apart from the approximate figure of several hundred autopsies, no counts or rates were given.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Technical note: a signed answer to a reader's question in a journal's 'Notes and queries' section, describing laboratory methods; not a study reporting data
• Who was studied: Lung tissues from several hundred autopsies in an earlier asbestosis-mesothelioma project in England. Those affected were a local population of elderly women never employed in asbestos industries. Exact numbers and dates of the autopsies are not given.
• Exposure: Powdered asbestos handled by women, mostly housewives, assembling gas masks during the Second World War, sometimes for only two weeks. Fiber types are not named.
• Main results:
  • In the earlier project, some patients had large numbers of asbestos fibers but no asbestos bodies. Others had few fibers or bodies but massive fibrosis or mesothelioma. Some with many asbestos bodies showed little evidence of disease. No numbers were given.
  • The author stated that certain specific types of asbestos were more likely to cause mesothelioma than other types. The types are not named.
  • Method for fresh, unfixed lung: fluid squeezed from a cut piece of lung (routinely the left lower lobe) was treated with 1% saponin to remove red blood cells, centrifuged, and examined as unstained wet preparations. Polarized light was used to find fibers.
  • Method for fixed, paraffin-embedded tissue: a section from each block was dewaxed in xylene, mounted in resinous medium, and examined unstained by bright field and polarized light. Asbestos bodies are strongly positive with Perls' Prussian blue because of iron in the coating.
  • Microincineration, recommended in some texts, was tried and found time-consuming and unreliable.
• The authors' conclusion: The author concluded that asbestos bodies have an unmistakable shape and do not need confirmation by a special stain, and that in fresh-tissue preparations they are conspicuous and easily identified.

Topics

The National Library of Medicine indexes this study under subjects our site covers: Asbestosis.

Medical terms in this study, explained in our Lexicon: Asbestos Bodies.

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• A method for extracting ferruginous bodies from sputum and pulmonary tissue — M.J. Smith, B. Naylor (1972)
• Discrepancies of asbestos body and fiber content between formalin-fixed and corresponding paraffin embedded lung tissue — B.K. Kuhn, F. Barresi, et al. (2021)
• A technique to prepare asbestos air samples for light and electron microscopy — T.W. Pang, A.E. Robinson (1981)
• Chemo-physical properties of asbestos bodies in human lung tissues studied at the nano-scale by non-invasive, label free x-ray imaging and spectroscopic techniques — F. Bardelli, F. Brun, et al. (2021)

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