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Mitochondria are critical organelles that maintain cellular metabolism and overall function. The catabolic pathway of autophagy plays a central role in recycling damaged mitochondria. Although the autophagy pathway is indispensable for some cancer cell survival, our latest study shows that rare autophagy-dependent cancer cells can adapt to loss of this core pathway. In the process, the autophagy-deficient cells acquire unique dependencies on alternate forms of mitochondrial homeostasis. These rare autophagy-deficient clones circumvent the lack of canonical autophagy by increasing mitochondrial dynamics and by recycling damaged mitochondria via mitochondrial-derived vesicles (MDVs). These studies are the first to implicate MDVs in cancer cell metabolism although many unanswered questions remain about this non-canonical pathway.

Beyond mitophagy: mitochondrial-derived vesicles can get the job done!