Your Heart Has Two Ways to “Take Out the Mitochondrial Trash” (And One of Them Is Secretion)
Most people think mitochondrial quality control is one story: mitophagy — tag the bad mitochondria, swallow them, degrade them in lysosomes. This Deep Dive expands the map. In the heart, where mitochondria take up ~⅓ of cardiomyocyte volume and ATP demand is relentless, cells use two routes to prevent a buildup of dysfunctional, ROS-leaking mitochondria: (1) intracellular degradation through multiple mitophagy and lysosome-linked pathways, and (2) extracellular secretion, where damaged mitochondria are exported — often inside extracellular vesicles — especially when internal clearance is…
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