Differences in the sensitivity of hamster and rat lung cells exposed in vitro to natural and man-made fibres

Our plain-English summary of Differences in the sensitivity of hamster and rat lung cells exposed in vitro to natural and man-made fibres, by M. Aufderheide, J.W. Knebel, P. Schulte (Experimental and Toxicologic Pathology, 1996).

The study

• Authors: M. Aufderheide, J.W. Knebel, P. Schulte
• Journal: Experimental and Toxicologic Pathology
• Published: 1996;48(6):505-7
• Cited by: 1 article, as counted by NIH iCite
• Read it: PubMed · Publisher

In plain English

This short article, based on a poster presented at a 1995 symposium in Hannover, Germany, described a laboratory experiment on cells grown in dishes, not on live animals or people. The authors exposed two lines of lung cells, one from hamsters (M3E3/C3) and one from rats (R3/1, established from bronchopulmonary tissue of male rat fetuses), to crocidolite asbestos and to a man-made glass fibre called B3K. After 48 hours they measured how much each fibre slowed cell growth. They expressed the result as the fibre concentration that cut cell growth by half compared with untreated control cultures, called the EC50. Crocidolite had a stronger effect on the cells than the glass fibre B3K. The rat cells reacted clearly more sensitively to both fibre types than the hamster cells. The authors concluded that this confirmed the assumption of differences between species. They noted that the mechanisms behind these effects still had to be studied in detail. They also said the results needed to be confirmed with other types of mineral fibres, and that adding human cell systems could increase confidence in the data for risk assessment.

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: In vitro laboratory experiment on cultured lung cell lines: a short-term growth-inhibition (MTT) assay, with cytotoxicity measured as the EC50, the concentration that reduced cell proliferation by 50% compared with control cultures
• Who was studied: Two cultured lung cell lines: the hamster cell line M3E3/C3 and the rat cell line R3/1, which was established from bronchopulmonary tissue of male Han-Wistar rat fetuses on day 20 of gestation; Institute of Experimental Pathology, Hannover Medical School, Germany
• Exposure: Crocidolite asbestos and the man-made glass fibre B3K, applied to the cells for 48 hours at a range of concentrations; each data point was the mean of eight replicate wells
• Main results:
  • In the cell systems tested, crocidolite asbestos had a stronger cytotoxic effect than the glass fibre B3K
  • The rat cell line R3/1 reacted clearly more sensitively to both crocidolite and B3K than the hamster cell line M3E3/C3
• The authors' conclusion: The authors concluded that the higher sensitivity of the rat cells to mineral fibres confirmed the assumption of species differences
• Limitations the authors state:
  • The mechanisms responsible for the difference in cytotoxic potency between crocidolite and the glass fibre had not yet been studied in detail
  • The results need to be confirmed with other types of mineral fibres to support the hypothesis of species-specific reactions
  • Only animal cells were used; the authors said including human in vitro systems could increase confidence in the data for risk assessment

Topics

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

Related studies

• Differences in the biological effects of crocidolite asbestos and two glass fibres on epithelial lung cells — M. Aufderheide, M. Riebe-Imre, et al. (1994)
• Long-term health effects in hamsters and rats exposed chronically to man-made vitreous fibres — D.M. Smith, L.W. Ortiz, et al. (1987)
• A comparison of the cytogenetic response to asbestos and glass fibre in Chinese hamster and human cell lines. Demonstration of growth inhibition in primary human fibroblasts — A.M. Sincock, J.D. Delhanty, et al. (1982)
• Persistence of man-made mineral fibres (MMMF) and asbestos in rat lungs — B. Bellmann, H. Muhle, et al. (1987)
• Sister-chromatid exchange and cell kinetics in CHO-K1 cells, human fibroblasts and lymphoblastoid cells exposed in vitro to asbestos and glass fibre — G. Casey (1983)
• Studies on the inhalation toxicology of two fiberglasses and amosite asbestos in the Syrian golden hamster. Part II. Results of chronic exposure — E.E. McConnell, C. Axten, et al. (1999)

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