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Ion microanalysis of cells

R W Linton, S R Walker, C R DeVries

    Scanning Electron Microscopy
    |January 1, 1980
    PubMed
    Summary
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    Ion microanalysis (IMA) reveals how toxic lead compounds enter cells and form new compounds. This technique offers detailed 3D chemical analysis of cells, aiding toxicological and cellular research.

    Area of Science:

    • Cellular Biology
    • Toxicology
    • Analytical Chemistry

    Background:

    • Freeze-fixed, freeze-dried cells require advanced techniques for chemical characterization.
    • Understanding cellular response to toxic agents is crucial in pathology.

    Purpose of the Study:

    • To review the application of ion microanalysis (IMA) for chemical characterization of cells.
    • To highlight IMA's utility in pathological studies involving toxic substances.

    Main Methods:

    • Application of ion microanalysis (IMA) to freeze-fixed, freeze-dried cells.
    • In vitro exposure of rabbit alveolar macrophages (RAMs) to lead tetroxide (Pb3O4) particles.
    • Quantitative elemental analysis using ion microanalytical techniques.

    Main Results:

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    • Lead from Pb3O4 was observed to migrate into RAMs.
    • Intracellular lead formed phosphorous-containing compounds within RAMs.
    • Quantitative comparisons revealed altered elemental concentrations in treated vs. control RAMs.

    Conclusions:

    • IMA enables in situ observation of xenobiotic agent penetration and intracellular chemistry.
    • IMA offers high elemental sensitivity, broad coverage, 3D analysis, and isotopic data for cell characterization.
    • Limitations include sputtering process non-idealities, lateral resolution constraints, and challenges in absolute quantification.