Macrophage phagocytic activity and cell phagocytic capacity following intratracheal instillation of a comixture of asbestos fibers

Our plain-English summary of Macrophage phagocytic activity and cell phagocytic capacity following intratracheal instillation of a comixture of asbestos fibers, by I. Trosic, M. Matausic-Pisl, D. Vucinic (Experimental and Toxicologic Pathology, 1995).

The study

• Authors: I. Trosic, M. Matausic-Pisl, D. Vucinic
• Journal: Experimental and Toxicologic Pathology
• Published: 1995;47(4):238-40
• Cited by: 2 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

In plain English

This was an animal experiment by researchers at the Institute for Medical Research and Occupational Health in Zagreb, Croatia. Material was placed directly into the windpipes of Wistar rats. One group of 30 rats received fluorescent polystyrene microspheres (tiny plastic beads used for comparison). A second group of 30 received a mixture containing disintegrated crocidolite asbestos fibers (0.625 mg of asbestos) and particles. Rats were killed on days 1, 7, 30, 80 and 180 after instillation, and their lungs were washed out to collect cells. The asbestos-mixture group had fewer total free cells and fewer alveolar macrophages (lung scavenger cells) than the microsphere group. Cell viability was similar in both groups, averaging between 75% and 85%. In the asbestos-mixture group, the number of macrophages taking up particles was strongly diminished, and the number of particles per macrophage was reported as significantly reduced. Apart from the viability range, the results were described in words and shown in graphs without printed group values, and no statistical tests were described. The authors concluded that the findings indicate the toxic effect of asbestos already at the alveolar cell level.

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: Animal experiment: intratracheal instillation in rats, comparing an asbestos-containing mixture with inert polystyrene microspheres, with lung lavage at several time points up to 180 days
• Who was studied: Wistar rats in two groups of 30 each (G1 and G2). The authors are at the Institute for Medical Research and Occupational Health, Zagreb, Croatia. Study dates are not given.
• Exposure: G1 received fluorescent carboxylated polystyrene microspheres (2.37 micrometer diameter) in sterile phosphate buffered saline. G2 received a co-mixture of disintegrated crocidolite asbestos fibers (0.625 mg of asbestos) and particles in phosphate buffered saline. Rats were killed on postinstillation days 1, 7, 30, 80 and 180.
• Main results:
  • Total free cell count and alveolar macrophage count in lung lavage fluid were diminished in the asbestos co-mixture group (G2) compared with the microsphere group (G1). These counts are shown only in graphs.
  • Viability of the lavaged free cells was similar in both groups throughout the study, averaging between 75% and 85%.
  • The number of alveolar macrophages that took up particles (phagocytic activity) was strongly diminished in the group exposed to fibres (G2).
  • The number of particles taken up per macrophage (phagocytic capacity) was reported as significantly reduced in G2 compared with G1. No test statistics or p-values were printed.
• The authors' conclusion: The authors concluded that the results showed a postponed macrophage quantity response and inhibited macrophage quality in the crocidolite co-mixture group compared with the polystyrene group. In their view, these findings indicate a toxic effect of asbestos already at the alveolar cell level.

Topics

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

Medical terms in this study, explained in our Lexicon: Macrophage.

Related studies

• Surface morphology and correlated phagocytic capacity of pulmonary macrophages lavaged from the lungs of rats — D.B. Warheit, L.H. Hill, et al. (1984)
• Increased 8-hydroxyguanine in DNA and its repair activity in hamster and rat lung after intratracheal instillation of crocidolite asbestos — R. Yamaguchi, T. Hirano, et al. (1999)
• The production of TNF-alpha and IL-1-like activity by bronchoalveolar leucocytes after intratracheal instillation of crocidolite asbestos — X.Y. Li, D. Lamb, et al. (1993)
• One-year follow-up of the phagocytic activity of leukocytes after exposure of rats to asbestos and basalt fibers — M. Hurbánková (1994)
• Scanning electron microscopical investigations of broncho-alveolar casts after intratracheal asbestos fibre instillation — B. Voss, T. Kerenyi, et al. (2000)
• Comparison of functional, biochemical, and morphometric alterations in the lungs of 4 rat strains and hamsters following repeated intratracheal instillation of crocidolite asbestos — D.J. Padilla-Carlin, D.L. Costa (2011)

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