Advanced science (Weinheim, Baden-Wurttemberg, Germany)Oct 30, 2026

A Small Molecule That Detects Damaged Mitochondria and Selectively Boosts Their Removal by Autophagy

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Nov 2, 2026

Abstract

MG-1 markedly enhanced autophagic flux and mitochondrial clearance under conditions of mitochondrial stress.

Bifunctional small molecules can activate damage-responsive mitophagy by linking mitochondrial recognition with autophagic machinery.
MG-1 was identified as a lead compound with minimal effects on normal autophagy.
Biochemical analyses confirmed that MG-1 promotes the breakdown of damaged mitochondria through lysosomes without directly uncoupling mitochondria.
MG-1 demonstrated good tolerance in experimental systems and improved movement in a zebrafish model of mitochondrial dysfunction.

Simplified

Mitophagy is a central mitochondrial quality-control pathway, and its pharmacological activation is considered to be geroprotective. However, its small-molecule activators act indirectly by perturbing metabolism or mitochondrial function, limiting selectivity and increasing toxicity. Here, we describe a chemical biology strategy for activating damage-responsive mitophagy using bifunctional small molecules that couple mitochondrial recognition to the recruitment of the autophagic machinery. We designed and synthesized a focused library of chimeric molecules and identified MG-1 as a lead compound. It had minimal effects on basal autophagy but markedly enhanced autophagic flux and mitochondrial clearance under conditions of mitochondrial stress. Biochemical analyses, together with fluorescence and electron microscopy, showed that MG-1 promotes lysosomal degradation of damaged mitochondria without acting as a direct mitochondrial uncoupler. MG-1 was well tolerated across experimental systems and improved locomotor performance in a zebrafish model of MPTP-induced mitochondrial dysfunction. These findings establish damage-gated small-molecule chimeras as a promising approach for selective control of mitochondrial quality.

Full Text

Full text is available at the source.

View Full Text ↗

A Small Molecule That Detects Damaged Mitochondria and Selectively Boosts Their Removal by Autophagy

Abstract

Full Text

You found one interesting study. We’ll send the next 7.

What Lands in Your Inbox Each Week:

Recent issues from the longevity & aging brief