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Lysosomes in normal pancreatic beta cells.

P Meda

    Diabetologia
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Lysosomes in pancreatic B-cells engage in crinophagy and autophagy, directly digesting secretory granules or engulfing them for breakdown. These organelles also transport enzymes, influencing granule content.

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    Area of Science:

    • Cell Biology
    • Endocrinology
    • Histology

    Background:

    • Lysosomes are crucial for cellular degradation.
    • Pancreatic B-cells produce and secrete insulin via secretory granules.
    • The precise interactions between lysosomes and secretory granules are not fully elucidated.

    Purpose of the Study:

    • To investigate the relationship between lysosomes and secretory granules in pancreatic B-cells.
    • To identify and characterize different lysosomal digestive processes involving secretory granules.
    • To examine the role of lysosomal enzymes in secretory granule content.

    Main Methods:

    • Electron microscopy of pancreatic B-cells from Wistar rats.
    • Cytochemical localization of acid phosphatase (AcPase) and arylsulphatase.

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  • Observation of lysosome-organelle interactions.

    • Main Results:

    • Multiple lysosome forms were identified and frequently interacted with secretory granules.
    • Two distinct digestive pathways were observed: crinophagy (direct fusion) and autophagy (engulfment).
    • Lysosomes were seen transporting arylsulphatase and acid phosphatase into secretory granules, impacting their enzymatic content.

    Conclusions:

    • Lysosomes play a dynamic role in regulating pancreatic B-cell secretory granule content through direct and indirect mechanisms.
    • Crinophagy and autophagy represent key lysosomal degradation pathways for secretory granules.
    • Lysosomal enzyme transport into granules may modulate their maturation and function.