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Related Experiment Videos

A comparative study of experimental and spontaneous emphysema.

C D Port, K V Ketels, D L Coffin

    Journal of Toxicology and Environmental Health
    |January 1, 1977
    PubMed
    Summary

    Scanning electron microscopy (SEM) revealed differences in lung alveoli pores across species. These pore variations may influence susceptibility to emphysema, particularly in humans and horses.

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    Area of Science:

    • Pulmonary Medicine
    • Comparative Anatomy
    • Microscopy

    Background:

    • Emphysema is a lung disease characterized by damage to alveoli.
    • Collateral ventilation pathways play a role in emphysema development.
    • Species-specific lung architecture may influence emphysema susceptibility.

    Purpose of the Study:

    • To compare normal and emphysematous lung architecture across species.
    • To investigate the role of alveolar pores in emphysema genesis.
    • To utilize scanning electron microscopy (SEM) for detailed morphological analysis.

    Main Methods:

    • Comparative light microscopy and scanning electron microscopy (SEM) of lung tissue from rats, mice, hamsters, horses, and humans.
    • Determination of pore-to-alveolus ratio using SEM in normal lungs of rabbits, dogs, guinea pigs, and rhesus monkeys, in addition to the initially studied species.
    • Morphological assessment of alveoli and airway structures.

    Main Results:

    • SEM provided enhanced visualization of alveoli and airway morphology compared to light microscopy.
    • Significant variability in alveolar pore size and number was observed across species.
    • Species with fewer pores per alveolus (e.g., rat, mouse, rabbit, hamster) are less likely to develop emphysema due to pore involvement.
    • Alveolar pores appear to be implicated in human and horse emphysema.

    Conclusions:

    • Alveolar pore characteristics, as visualized by SEM, are a significant factor in species-specific emphysema susceptibility.
    • The number of pores per alveolus may influence the pathogenesis of emphysema.
    • Further research into collateral ventilation and pore morphology is warranted for understanding emphysema.

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