Researchers discover a new trigger for mitophagia

Autocracy is essentially the “garbage collection” of our cells. If there are problems in this process, which is so important to our health, diseases such as Parkinson may occur. In their latest study, top cell biologists in Max Perutz laboratories at the University of Vienna investigated mitophagia – a form of autophagy – and came to a remarkable conclusion: researchers described a new trigger for mitophagia.

This discovery has led to a re -evaluation of the hierarchy of actors that cause autophagy. Recently discovered signaling routes could also open new treatment options. The study has been published in the renowned magazine Biology of Nature Cell.

Autophagy is a self -cleaning process of cell and is vital to cell health in the human body. A sophisticated molecular monitoring command identifies suspicious substances – broken cell ingredients, aggregated proteins or even pathogens – and begins their removal. Finally, the defective ingredients of cells are separated and recycled.

Mitophagia is a form of autophagia in which mitochondria in a cell specifically degrade. Mitophagia dysfunction is particularly linked to Parkinson’s disease. Therefore, a better understanding of this process is important for the fight against Parkinson.

In a new study led by postdoctoral researcher Elias Adriaenssens from Sascha Martens team at Max Perutz Labs at the University of Vienna, scientists reveal a new mechanism for activating mitophagia. So far, the research has focused largely on the Pink1/Parkin signaling trail. Signaling routes are used to transmit information within cells. These complex molecule networks control critical cell functions such as growth, division, cell death and, indeed, mitophagia.

“When we looked at the big picture, it became clear that, in addition to the highly studied” Pink1/Parkin Pathway “, there were huge gaps in our knowledge of other Mitopia streets.

Elias Adrienssens, Study Leader and Postdoctoral Researcher, University of Vienna

Recently discovered trails are no exception

“We found that NIX and BNIP3 – two well -known mitophagia receptors – can cause autophagia without a commitment to FIP200 (protein), which was quite unexpected,” Adriaenssens explains.

FIP200 is considered necessary for the activation of autophagy. “This presented us with a puzzle. Despite the extensive tests, we could not detect any interaction between FIP200 and one of the two receptors – which raises the crucial issue of how they operate without this supposed critical ingredient,” he adds.

However, mass spectrometry revealed that other autophagy ingredients, known as WIPI proteins, are bound to these mitochondrial receptors. Since WIPI proteins were previously considered to be acting later on signaling, their participation in activation of autophagia was amazing. Monitoring experiments have confirmed these interactions and suggested that wIPI mediation is not an exception, but it may previously mediate unknown paths in selective autophagia.

“This is an exciting discovery – it reveals a parallel trigger for selective autophagy. Instead of a single, universal mechanism, cells seem to use different molecular strategies depending on the receptor and context.

Potential for new treatments for Parkinson’s disease

Looking forward, the study raises an important question: How do the cells decide between alternative mitophagia signaling paths – why do some receptors use each other and what factors determine which pathway is used? The distinction between selective mitophagia signaling trails could pave the way for treatments that specifically activate a path to offset the defects in the other, which has long -term potential for the treatment of Parkinson’s disease.