How Cells Repair Themselves: New Insights into Lysosome Damage Response

 

Rapid Response to Lysosome Damage

Damage to a cell’s lysosome can be catastrophic. When the membrane ruptures, it releases harmful contents that can trigger inflammation and even cell death, so the cell must respond quickly.

In a new Trends in Cell Biology opinion article, Nanyang Assistant Professor Claudio Bussi from the School of Biological Sciences (SBS), together with Dr Weiping Li from IDMxS, puts forward a perspective on how cells deal with this kind of damage. They propose that the damage itself triggers the rapid formation of temporary, gel-like droplets known as “repair condensates” directly at the rupture site.

These condensates act as a physical plug, helping to stabilise the damaged membrane. At the same time, they serve as a local organising centre, bringing together the cellular machinery needed to carry out repair.

A model for converging pathways and ‘repair condensates’ in lysosomal membrane repair.

 

Repair Condensates as Organisational Hubs

Repair condensates also function as organisational hubs, recruiting proteins and other components necessary for the repair process. This coordinated response helps ensure the lysosomal membrane is stabilised and restored efficiently, preventing the spread of toxic contents and maintaining cellular integrity.

3D visualisation. Credit: IDMxS.

 

Balancing Repair and Removal

The article also highlights how cells decide whether to repair a damaged lysosome or target it for lysophagy, the selective removal process for dysfunctional lysosomes. The authors suggest that the behaviour and dynamics of repair condensates may play a role in this decision, linking the early response to damage with downstream pathways that determine lysosome fate. 

Hypothetical dynamics of repair condensates and their influence on lysosome fate

 

Implications for Cellular Health

This opinion piece presents an integrated model in which biomolecular condensation and the formation of specialised lipid domains are proposed as interconnected organising principles for lysosomal repair. These insights offer a way to understand how cells respond to damage and may shed light on disease mechanisms linked to cellular stress, inflammation, and neurodegeneration.

Read the full paper here.