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  • Organelle-specific mechanis...
    Zein, Laura; Fulda, Simone; Kögel, Donat; van Wijk, Sjoerd J.L.

    Matrix biology, June 2021, 2021-06-00, 20210601, Letnik: 100-101
    Journal Article

    •Autophagy-dependent cell death (ADCD) is a versatile, caspase-independent form of programmed cell death.•Multiple drugs and natural compounds can trigger ADCD in cancer cells.•Pharmacological induction of ADCD affects cell organelles, like mitochondria and the ER, and triggers organelle stress and dysfunction.•Selective forms of autophagy, such as mitophagy and ER-phagy, are involved in drug-induced ADCD. The conserved catabolic process of autophagy is an important control mechanism that degrades cellular organelles, debris and pathogens in autolysosomes. Although autophagy primarily protects against cellular insults, nutrient starvation or oxidative stress, hyper-activation of autophagy is also believed to cause autophagy-dependent cell death (ADCD). ADCD is a caspase-independent form of programmed cell death (PCD), characterized by an over-activation of autophagy, leading to prominent self-digestion of cellular material in autolysosomes beyond the point of cell survival. ADCD plays important roles in the development of lower organisms, but also in the response of cancer cells upon exposure of specific drugs or natural compounds. Importantly, the induction of ADCD as an alternative cell death pathway is of special interest in apoptosis-resistant cancer types and serves as an attractive and potential therapeutic option. Although the mechanisms of ADCD are diverse and not yet fully understood, both non-selective (bulk) autophagy and organelle-specific types of autophagy are believed to be involved in this type of cell death. Accordingly, several ADCD-inducing drugs are known to trigger severe mitochondrial damage and endoplasmic reticulum (ER) stress, whereas the contribution of other cell organelles, like ribosomes or peroxisomes, to the control of ADCD is not well understood. In this review, we highlight the general mechanisms of ADCD and discuss the current evidence for mitochondria- and ER-specific killing mechanisms of ADCD-inducing drugs.