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Related Experiment Videos

Mouse megakaryocytes secrete acetylcholinesterase

J M Paulus, J Maigne, E Keyhani

    Blood
    |December 1, 1981
    PubMed
    Summary

    This study reveals how acetylcholinesterase (AchE) is synthesized, concentrated, and secreted by mouse megakaryocytes. This process may regulate the proliferation of blood cell progenitors.

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    Area of Science:

    • Hematology
    • Cell Biology
    • Biochemistry

    Background:

    • Acetylcholinesterase (AchE) is a key marker in rodent thrombopoiesis.
    • AchE functions both as a membrane-bound and secretory enzyme in various tissues.
    • Its role in megakaryocytes, the cells that produce platelets, requires detailed investigation.

    Purpose of the Study:

    • To elucidate the ultrastructural transport and fate of acetylcholinesterase (AchE) within mouse bone marrow megakaryocytes.
    • To characterize the secretory pathway and identify novel organelles involved in AchE processing.
    • To explore the potential role of secreted AchE in modulating hematopoietic progenitor cell activity.

    Main Methods:

    • Utilized an adapted indirect thiocholine method (Tranum-Jensen and Behnke) for ultrastructural visualization of AchE.
    • Examined megakaryoblasts and megakaryocytes in mouse bone marrow.
    • Analyzed the synthesis, concentration, and discharge pathways of AchE.

    Main Results:

    • Identified a distinct secretory cycle for AchE in megakaryocytes, involving synthesis on the endoplasmic reticulum and nuclear envelope.
    • Observed AchE concentration within unique AchE-vesicles and AchE-granules derived from the Golgi apparatus.
    • Demonstrated AchE discharge via the demarcation membrane system and into the extracellular space, with activity found in released platelets' open canalicular system.

    Conclusions:

    • AchE-vesicles and granules represent novel megakaryocytic organelles with a unique formation and fate.
    • The secretory pathway of AchE in megakaryocytes is distinct from those of primary lysosomes and peroxidase granules.
    • Megakaryocyte secretion of AchE may regulate acetylcholine levels, potentially modulating the proliferative activity of megakaryocyte progenitors.

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