# Mitophagy and Ubiquitination Coordinate Context‐Specific Mitochondrial Quality Control and EMT/MET Plasticity to Drive Cancer Cell Invasion

## TL;DR

Cancer cell invasion is driven by mitochondrial quality control and ubiquitination processes that respond to environmental and cellular conditions.

## Contribution

The paper introduces a context-stratified framework linking mitochondrial dynamics and ubiquitin signaling to cancer cell plasticity and invasion.

## Key findings

- Mitochondrial vulnerabilities signal mitophagy to maintain organelle fitness under stress.
- Ubiquitin conjugation links mitochondrial remodeling to cytoskeletal changes and invasive behavior.
- Therapeutic strategies targeting ubiquitin signaling and mitophagy may constrain tumor dissemination.

## Abstract

Metastatic invasiveness emerges from coordinated intrinsic programs and microenvironmental cues that converge on mitochondrial quality control (MQC). Here, we use “context” to denote stage‐ and site‐aware constellations of tumor‐intrinsic states (e.g., mtROS tone, mtDNA integrity, epigenetic wiring, cellular stiffness, oncogenic mutations) and extrinsic landscapes (oxygen–nutrient availability, ECM mechanics, stromal/inflammatory signals). These axes jointly shape mitochondrial adaptation by tuning bioenergetics, redox balance, metabolic plasticity, fission–fusion dynamics, mechanosensitive hubs, and Ca2
+ homeostasis. As pressures intensify, mitochondrial vulnerabilities—such as mtDNA compromise and mtUPR activation—signal the engagement of mitophagy to preserve organelle fitness under stress. Through these coupled changes in mitochondrial performance and stress responses, context governs EMT/MET plasticity and transitions across migratory, invasive, and proliferative states. Mechanistically, ubiquitin conjugation, via E3 ligases and deubiquitinases, serves as an integrating conduit that links mitochondrial remodeling and mitophagy to cytoskeletal reprogramming and invasive behavior. This ubiquitin–mitochondria interface therefore represents a coherent therapeutic entry point; translational strategies including PROTAC‐enabled targeting and selective E3/DUB or mitophagy‐pathway modulators may rebalance pathological ubiquitin signaling, restore mitochondrial homeostasis, and constrain tumor dissemination.

Metastatic invasion emerges when tumor‐intrinsic programs and microenvironmental forces converge on mitochondrial quality control. A context‐stratified framework links mtROS, mtDNA integrity, mechanics and nutrient/oxygen cues to fission–fusion remodeling, mtUPR and mitophagy. Ubiquitin “writers” and “erasers” translate these pressures into EMT/MET switching, revealing actionable intervention points such as E3/DUB modulators and PROTAC‐like tools.