Labeling rat alveolar macrophages with fluorescent microspheres

Arthur Morgan*, Jeremy P. Keilington, Keith J. Morris, Clare G. Collier, Alan Hodgson

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    Rats were exposed for various periods (5, 20, 60, and 120 min) to an aerosol of fluorescent polystyrene microspheres (FPM) with nominal diameter 1.07 μm. All the animals were killed 40 h later and the lungs were lavaged 10 times with physiological saline. Washings 1-2 and 3-10 were combined. The numbers of alveolar macrophages (AM) recovered by lavage were measured with a Coulter counter. Cytospin slides of cells in the lavage fluid were prepared and used to determine the fraction of recovered AM that contained FPM (labeling index, LI) and the FPM/AM profile. The same parameters were also measured by flow cytometry. There was good agreement between determinations of LI and FPM/AM by manual scoring methods and by flow cytometry. Samples of lavage fluid were digested with sodium hypochlorite (bleach), and aliquots of the resulting digests were filtered. Examination of the filters with epifluorescence microscopy enabled the total numbers of FPM present in the various lung washes to be determined. The lavaged lungs were also digested with bleach, and the number of FPM remaining was estimated by manual scoring only. Flow cytometry could not be used for this purpose, due to the presence of cellular debris. After exposure to airborne FPM at the concentration used for 2 h, less than half the recovered AM contained FPM. For studies of AM kinetics it will be necessary to achieve higher LI values and numbers of FPM per cell than were obtained in the present study.

    Original languageEnglish
    Pages (from-to)255-267
    Number of pages13
    JournalInhalation Toxicology
    Issue number2
    Publication statusPublished - 1995

    Bibliographical note

    Funding Information:
    Received 10 February 1994; accepted 16 August 1994. This work was supported jointly by the UK Department of Health and the UK Department of Energy under Programme Letter 64. Copyright is held by the UK Atomic Energy Authority. Address correspondence to Dr. A. Morgan, Biomedical Research, AEA Technology, 551, Harwell, Didcot, Oxfordshire OX1 1 ORA, United Kingdom.

    Copyright 2016 Elsevier B.V., All rights reserved.


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