Factors involved in the cytotoxicity of UICC amosite towards macrophages

Our plain-English summary of Factors involved in the cytotoxicity of UICC amosite towards macrophages, by R. Davies, D.M. Griffiths, A.W. Preece (Environmental Health Perspectives, 1983).

The study

• Authors: R. Davies, D.M. Griffiths, A.W. Preece
• Journal: Environmental Health Perspectives
• Published: 1983;51:245-8
• Cited by: 3 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Abstract

The cytotoxicity of various ball-milled UICC amosite samples toward mouse peritoneal macrophages in vitro was examined. On increased ball milling, the cytotoxicity of the amosite samples fell. This decreased biological activity seemed to correlate best with number of fibers longer than 4 micron/micrograms dust, rather than total number of fibers or the electrophoretic mobility of the amosite samples.

In plain English

This laboratory study tested how grinding affected the toxicity of UICC amosite, a standard reference sample of amosite asbestos, to mouse cells. The authors ball-milled amosite for various times. They exposed macrophages (immune cells) taken from the abdominal cavity of female mice to each sample for 18 hours, and measured cell damage by release of the enzyme lactate dehydrogenase. Fiber sizes were measured by electron microscopy and surface charge by laser Doppler velocimetry. As milling time increased, the samples' toxicity to the cells fell sharply. Electrophoretic mobility (surface charge) changed only slightly: 3.25 micrometres per second per volt per centimetre for unmilled amosite, 2.70 after 4 hours of milling. Total fiber number per microgram rose, peaked after 0.5 hours, then declined, so toxicity did not follow total fiber count. The number of fibers longer than 4 micrometres fell with milling, mirroring the fall in toxicity. The authors concluded that toxicity seemed to correlate best with these longer fibers. They suggested the 2- and 4-hour samples might have low potential to cause fibrosis, but noted that no published data support this.

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 mouse cells
• Who was studied: Macrophages obtained by washing out the peritoneal (abdominal) cavity of female T.O. mice weighing 22-27 g. Four cultures were used for each dust treatment. The work was done at the MRC Pneumoconiosis Unit, Penarth, Wales, and the Oncology Research Unit, Bristol, UK; dates are not given.
• Exposure: UICC amosite samples ball-milled in a ceramic ball mill for various times (the text mentions 0.5, 2 and 4 hours), added to macrophage cultures for 18 hours
• Main results:
  • Cytotoxicity of the amosite samples to the macrophages, measured as lactate dehydrogenase release, fell sharply as ball-milling time increased
  • Electrophoretic mobility (surface charge) of the amosite changed only slightly. It was 2.70 micrometres per second per volt per centimetre after 4 hours of milling, compared with 3.25 for the parent UICC amosite. The OCR renders the unit as 'jan/sec-V/cm'; the figure legend's 'um/sec-V/cm' confirms micrometres. The authors judged this change unlikely to be the main factor in the fall in cytotoxicity.
  • The total number of fibers (particles with a length-to-diameter ratio greater than 3) per microgram of dust rose with milling, peaked after 0.5 hours and then declined. The authors concluded that cytotoxicity does not depend on total fiber number.
  • The number of fibers longer than 4 micrometres per microgram of dust fell with increased milling time, mirroring the fall in cytotoxicity
• The authors' conclusion: The authors concluded that the decreased cytotoxicity seemed to correlate best with the number of fibers longer than 4 micrometres per microgram of dust, rather than with total fiber number or electrophoretic mobility. They suggested that amosite ball-milled for 2 or 4 hours would have low fibrogenic (fibrosis-causing) potential.
• Limitations the authors state:
  • The authors noted that no published data support their prediction that amosite milled for 2 or 4 hours would have low fibrogenic potential
  • The authors stated that their results do not exclude a role for surface charge in amosite's biological effect

Topics

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

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

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