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  • Title: Development of Auer bodies from giant inclusions associated with rough endoplasmic reticulum in acute promyelocytic leukemia.
    Author: Ru YX, Dong SX, Liu J, Eyden B.
    Journal: Blood Sci; 2023 Apr; 5(2):111-117. PubMed ID: 37228776.
    Abstract:
    Giant inclusions and Auer bodies in promyeloblasts were investigated in a study which included transmission electron microscopy (TEM) for morphology and ultrastructural cytochemistry for myeloperoxidase in 10 patients with acute promyelocytic leukemia (APL). Ultrastructural cytochemistry demonstrated positive myeloperoxidase reactivity in giant inclusions, expanded rER cisternae, Auer bodies and primary granules. TEM revealed that giant inclusions were adorned by degenerated rER membrane, some of them sharing features with Auer bodies. We hypothesize a novel origin for Auer body development in promyeloblasts of APL, namely that they originate from peroxidase-positive and expanded rER cisternae, and that primary granules were directly released from these expanded rER elements, bypassing the Golgi apparatus.
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