One-year follow-up of the phagocytic activity of leukocytes after exposure of rats to asbestos and basalt fibers

Our plain-English summary of One-year follow-up of the phagocytic activity of leukocytes after exposure of rats to asbestos and basalt fibers, by M. Hurbánková (Environmental Health Perspectives, 1994).

The study

• Author: M. Hurbánková
• Journal: Environmental Health Perspectives
• Published: 1994;102 Suppl 5(Suppl 5):201-3
• Cited by: 3 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Abstract

The phagocytic activity of leukocytes in peripheral blood was investigated after 2, 24, and 48 hr; 1, 2, 4, and 8 weeks; and 6 and 12 months following intraperitoneal administration of asbestos and basalt fibers to Wistar rats. Asbestos and basalt fibers differed in their effects on the parameters studied. Both granulocyte count and phagocytic activity of leukocytes during the 1-year dynamic follow-up in both dust-exposed groups of animals changed in two phases, characterized by the initial stimulation of the acute phase I, followed by the suppression of the parameters in the chronic phase II. Exposure to asbestos and basalt fibers led, in phase II, to impairment of the phagocytic activity of granulocytes. Asbestos fibers also significantly decreased phagocytic activity of monocytes. Exposure to basalt fibers did not affect the phagocytic activity of monocytes in phase II. Results suggest that the monocytic component of leukocytes plays an important role in the development of diseases caused by exposure to fibrous dusts, but basalt fibers have lesser biological effects than asbestos fibers.

In plain English

In this animal experiment, the author injected fibers into the abdominal cavity (intraperitoneally) of Wistar rats. Ten rats received 20 mg of chrysotile asbestos and 10 rats received 50 mg of basalt fibers. The higher basalt dose was chosen because basalt dust contains fewer fibers. Unexposed rats served as controls (n = 20). From 2 hours to 12 months afterward, blood samples were tested for the number of granulocytes per 100 white blood cells and for the ability of white blood cells (granulocytes and monocytes) to engulf test particles, called phagocytic activity. In both exposed groups, this activity rose at first and later fell below control levels. In chrysotile-exposed rats, the percentage of phagocytic granulocytes was significantly lower than in controls from after 48 hours to the end of the year. Phagocytic monocytes were also significantly lower at most later time points, except at 6 months. In basalt-exposed rats, phagocytic monocytes were above control levels up to week 8, similar at 6 months, and below controls at 12 months. The author assumed that monocytes play a significant role in asbestos-related disease and wrote that the results suggest basalt fibers have lesser biological effects than asbestos fibers.

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: intraperitoneal injection of fibers into rats, with repeated blood testing over one year compared with unexposed controls
• Who was studied: Wistar rats: 10 given chrysotile asbestos, 10 given basalt fibers, and an unexposed control group (n = 20); Bratislava, Slovakia; tested at 2, 24 and 48 hours, 1, 2, 4 and 8 weeks, and 6 and 12 months
• Exposure: Chrysotile asbestos, 20 mg in 2 ml physiological solution per rat (mean fiber length 14.01 micrometers, diameter 0.84 micrometers); basalt fiber dust, 50 mg in 2 ml per rat (mean length 57.1 micrometers, diameter 3.74 micrometers); both injected intraperitoneally, in a 1:2.5 dose ratio because basalt dust has a lower fiber content
• Main results:
  • Chrysotile-exposed rats: the number of granulocytes per 100 leukocytes rose significantly at 2 hours, fell to control level by week 8, then increased significantly until the end of the experiment
  • Basalt-exposed rats: granulocyte numbers per 100 leukocytes were significantly increased up to week 8, but similar to controls at 6 and 12 months
  • Chrysotile-exposed rats: the percentage of phagocytic cells rose significantly up to 48 hours, then stayed significantly below controls from week 1 to the end of the year
  • Basalt-exposed rats: the percentage of phagocytic cells increased up to week 8, then fell below the control level
  • Phagocytic granulocytes: increased up to 48 hours and then significantly lower to the end in chrysotile-exposed rats; in basalt-exposed rats, significantly decreased after the first week, though less sharply than with asbestos
  • Chrysotile-exposed rats: phagocytic monocytes were significantly increased at 2 hours, equal to controls at 24 and 48 hours, and significantly lower thereafter except at 6 months
  • Basalt-exposed rats: phagocytic monocytes were higher than controls up to week 8, similar at 6 months, and below controls at 12 months
• The authors' conclusion: The author assumed that the monocytic fraction of white blood cells plays a significant role in the cause of diseases from asbestos exposure, and wrote that the results suggest basalt fibers have lesser biological effects than asbestos fibers

Topics

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

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