Nobel Prize Honors Autophagy Discovery

    Cancer Discovery
    |December 7, 2016
    PubMed
    Summary

    Japanese researcher Yoshinori Ohsumi won the Nobel Prize for discovering autophagy, a cellular recycling process. This mechanism is vital for cell survival and plays a role in cancer cells.

    Related Concept Videos

    Autophagy01:27

    Autophagy

    Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
    An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
    6.0K
    Delivery Pathways to the Lysosome01:36

    Delivery Pathways to the Lysosome

    Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
    Endocytosis
    In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
    10.4K
    Autophagic Cell Death01:18

    Autophagic Cell Death

    Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
    Autophagy and Apoptosis
    Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and...
    4.9K
    Lysosomal Hydrolases01:22

    Lysosomal Hydrolases

    Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
    4.7K
    Phagocytosis of Apoptotic Cells01:17

    Phagocytosis of Apoptotic Cells

    Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
    Normal cells contain receptors that prevent them from being recognized...
    5.4K
    Protein Kinases and Phosphatases02:54

    Protein Kinases and Phosphatases

    Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
    Protein kinases
    Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
    15.4K