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The recent discovery of autosis as a variant of autophagy-dependent cell death has challenged the conventional understanding of cell death and programmed cell death in cellular decision making. In contrast to previous accounts of distinct cell death modalities, autosis occurs with high autophagic activity, in the absence of apoptotic and necrotic markers and yet is not fully regulated by typical autophagy markers. Given the metabolic importance of autophagic responses and the extensive cross-talk with both apoptosis and necrosis signalling, the classical and morphotype-driven characterization of cell death as pre-determined subroutines is being increasingly called into question. Furthermore, the conflicting evidence with regards to cell death induction through autophagy modulation in various cancer models highlights the lack of consensus over the extent to which autophagy assists in cell death ontrol and whether it is capable of being a bona fide lethal process. This review evaluates the evidence and context of autophagy-dependent cell death and delineates the role of an autophagic flux threshold associated with 'lethal' and 'non-lethal' autophagy and its role in autosis control. In doing so, cancer treatment avenues will be explored with regards to precision modulation of tumour autophagic flux to ascertain whether autosis induction may present a novel therapeutic strategy.

The good, the bad and the autophagosome: exploring unanswered questions of autophagy-dependent cell death