Asbestos inhalation and the induction of splenic lymphocytic proliferation in the rat

Our plain-English summary of Asbestos inhalation and the induction of splenic lymphocytic proliferation in the rat, by E. Kagan, K. Miller (Chest, 1981).

The study

• Authors: E. Kagan, K. Miller
• Journal: Chest
• Published: 1981;80(1 Suppl):11-2
• Cited by: 2 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

In plain English

This short conference report described an animal experiment. Adult male BD-IX rats breathed UICC crocidolite asbestos intermittently for six months (1350 fibers/ml; 10.3 mg per cubic metre). A matched group of rats received no asbestos. The authors grew lung macrophages (scavenger cells) and spleen lymphocytes (immune cells) from both groups together in the laboratory, in all combinations. Macrophages from exposed rats caused significant lymphocyte multiplication at 72 and 96 hours (P less than 0.001), with lymphocytes from either group. This was compared with mixtures using macrophages from unexposed rats. With lymphocytes from unexposed rats, the response peaked at 72 hours (15440 plus or minus 368 dpm). It was abolished when the macrophages were pre-treated with L-cysteine (3168 plus or minus 279 dpm). With the rat's own lymphocytes, it peaked at 96 hours (11838 plus or minus 2515 dpm) and was not abolished by L-cysteine (11805 plus or minus 1657 dpm). The authors concluded that asbestos inhalation produced two distinct effects on the macrophages, one attributed to a putative asbestos-related neoantigen. They suggested immune reactions might contribute to asbestosis. The number of rats was not reported.

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: inhalation exposure of rats followed by laboratory co-culture (lymphoproliferation) assays; short conference report
• Who was studied: Adult male BD-IX strain rats exposed to asbestos ('dusted rats') and a matched group of unexposed BD-IX control rats; number of animals not reported
• Exposure: Intermittent inhalation of UICC crocidolite asbestos at 1350 fibers/ml (10.3 mg per cubic metre) for six months
• Main results:
  • Alveolar macrophages from asbestos-exposed rats induced significant lymphocyte proliferation after 72 hours (P < 0.001) and 96 hours (P < 0.001), in lymphocytes from the same rats or from unexposed control rats. The comparison was with co-cultures containing macrophages from control rats.
  • In co-cultures of macrophages from exposed rats with lymphocytes from control rats, the response peaked at 72 hours (15440 plus or minus 368 dpm)
  • That response (exposed-rat macrophages with control-rat lymphocytes) was abolished by pre-treating the macrophages with L-cysteine (3168 plus or minus 279 dpm)
  • A similar effect could be shown by pre-treating alveolar macrophages from control rats with sodium metaperiodate (NaIO4)
  • In co-cultures of macrophages from exposed rats with the same rats' own lymphocytes, the response peaked at 96 hours (11838 plus or minus 2515 dpm)
  • The response with the rats' own lymphocytes was not abolished by L-cysteine (11805 plus or minus 1657 dpm)
  • In the recorded discussion, the author stated that less than 3% of the total lung lavage cells were neutrophils
• The authors' conclusion: The authors concluded that prolonged asbestos inhalation in the rat produced two distinct effects on alveolar macrophages. The first was a periodate-like effect, akin to surface membrane peroxidation, which L-cysteine abolished. The second was an effect attributed to a putative asbestos-related, macrophage-associated neoantigen, which L-cysteine did not abolish. They suggested that cellular immunity to inhaled asbestos might start a series of reactions, with pulmonary fibrosis as the end-stage, which bears on how asbestosis develops.

Topics

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

Related studies

• Manifestations of cellular immunity in the rat after prolonged asbestos inhalation. II. Alveolar macrophage-induced splenic lymphocyte proliferation — K. Miller, E. Kagan (1981)
• Lymphocytic alveolitis and pleural calcifications in nonoccupational asbestos exposure. Protection against neoplasia? — S.H. Constantopoulos, Y.A. Dalavanga, et al. (1992)
• Aryl hydrocarbon hydroxylase induction in mitogen-stimulated lymphocytes by benzanthracene or cigarette tars adsorbed to asbestos fibers — T.L. McLemore, W.T. Jenkins, et al. (1979)
• Novel cell imaging techniques show induction of apoptosis and proliferation in mesothelial cells by asbestos — J.L. Goldberg, C.L. Zanella, et al. (1997)
• Induction of pulmonary carcinoma in rats by chronic inhalation of dust from pulverized asbestos pipe covering — B.K. Leong, R.J. Kociba, et al. (1978)
• Re-evaluation of histological findings of nonparasitic splenic cysts — P. Vajda, L. Kereskai, et al. (2012)

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