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Related Experiment Videos

Protease-induced experimental emphysema: the relationship between elastolytic activity and emphysema induction

M Takamoto, N Miyazaki, T Ishibashi

    The Japanese Journal of Experimental Medicine
    |October 1, 1978
    PubMed
    Summary

    Elastase and papain can induce experimental emphysema. Elastase

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    Area of Science:

    • Pulmonary Research
    • Biochemistry

    Background:

    • Experimental emphysema models are crucial for understanding lung diseases.
    • Protease-induced emphysema is a common research model.

    Purpose of the Study:

    • To compare the emphysema-inducing capacity and elastolytic activity of various proteases.
    • To evaluate the utility of isolated lungs and guinea pigs in emphysema research.

    Main Methods:

    • In vivo and in vitro induction of experimental emphysema using proteases.
    • Assessment of emphysematous changes and elastolytic activity.
    • Utilizing isolated guinea pig lungs for enzyme-instillation experiments.

    Main Results:

    • Elastase and papain were the only proteases capable of inducing emphysema.

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  • Elastase-induced emphysema showed a dose-dependent effect in vitro.
  • Papain's emphysema-inducing mechanism, despite lacking elastolytic activity, remains unclear.
  • Isolated lungs required smaller enzyme doses and avoided interference from endogenous factors.
  • Guinea pigs proved effective for both in vivo and in vitro emphysema induction.

    • Conclusions:

    • Elastase is a reliable agent for inducing experimental emphysema, with defined dose requirements.
    • Papain's emphysema-inducing properties warrant further investigation.
    • Isolated lung preparations offer advantages for controlled protease-induced emphysema studies.
    • Guinea pigs are a suitable animal model for emphysema research.