Advances in biological regulationOct 10, 2026

Differences and roles of two main systems that clear damaged cell powerhouses

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Oct 11, 2026

Abstract

Mitophagy involves the degradation of damaged mitochondria through distinct pathways, with BNIP3/NIX and Parkin playing key roles.

BNIP3/NIX-mediated mitophagy is crucial for maintaining mitochondrial turnover in normal and stressed conditions.
Parkin-mediated mitophagy detects mitochondrial damage by sensing loss of membrane potential.
Both pathways utilize different molecules to activate the autophagy process at mitochondria.
The dynamics of the isolation membrane during mitophagy are linked to mitochondrial division and organization.
Understanding these pathways may provide insights into their roles in health and disease.

Simplified

Mitophagy is a form of selective autophagy in which an isolation membrane (IM or phagophore) sequesters damaged or superfluous mitochondria for lysosomal degradation. Recent advances in receptor-mediated mitophagy, particularly the BNIP3/NIX-mediated mitophagy, have highlighted the importance of this pathway in mitochondrial regulation across various biological settings, along with the well-established Parkin-mediated pathway. Parkin-mediated mitophagy senses mitochondrial damage through loss of membrane potential, whereas BNIP3/NIX-mediated mitophagy plays an important role in basal or physiologically induced mitochondrial turnover, thereby contributing to mitochondrial quality control and remodeling. These two pathways employ distinct sets of molecules to recruit the autophagy machinery to the mitochondria and exhibit different IM dynamics that are closely linked to mitochondrial fission and segregation. In this review, we first provide an updated overview of the autophagy process and then compare these two major forms of mitophagy, with particular emphasis on the molecular mechanisms of mitophagy initiation and IM dynamics. We also discuss the functional implications of these mechanistic differences in physiological and pathological context.

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Differences and roles of two main systems that clear damaged cell powerhouses

Abstract

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