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Technical University of Munich -TUM
Technical University of Munich -TUM
Our university combines top-class facilities for cutting-edge research with unique learning opportunities for 48,000 students. Whether our researchers are investigating the origins of life, matter and the universe or looking for solutions to the major challenges for our society, people lie at the heart of our research and innovation agenda. Our goal is to create lasting value for society through excellence in education and research, the active promotion of next-generation talents and a strong entrepreneurial spirit. All of which combine to make TUM one of Europe’s leading universities.
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Insight into the molecular mechanisms of ALS

Mo, 5.8.2024
| Original article from: Technical University of Munich
Newly discovered subtypes and sex differences create new approaches for drugs.
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  • Photo: Technical University of Munich / Klinikum rechts der Isar / Thomas Einberger: Insight into the molecular mechanisms of ALS - Prof. Paul Lingor is the head of the consortium that conducted the study.
  • nature video: Inside ALS: The neurons behind the disease

Amyotrophic lateral sclerosis, ALS for short, is a mysterious neurodegenerative disease that is almost always fatal. A consortium of researchers led by the Technical University of Munich (TUM) has systematically investigated the underlying molecular mechanisms of ALS. Among other things, the team discovered that ALS can be divided into subtypes. Depending on the subtype, different drugs could be effective. There are also clear differences in the molecular processes when comparing men and women.

The molecular processes in the body that cause ALS patients to increasingly lose control of motor functions are still poorly understood. Previous studies have been limited to individual aspects of the underlying molecular processes. A consortium led by Prof. Paul Lingor, a neurologist at TUM, has investigated ALS using a so-called "multi-omics" approach. The researchers mapped both coding and non-coding RNA molecules and the entirety of the proteins.

Technical University of Munich / Mojan Parvaz: There are hardly any drugs against ALS. A new study shows that a substance acting on the MAPK signaling pathway may help: After treatment with trametinib, mouse nerve cells (blue) survived better than without.

Four subtypes

A key finding of the study is that ALS can be roughly divided into four subtypes. "You can't distinguish between these variants based on the clinical symptoms," says Paul Lingor, who, together with other researchers is part of the SyNergy Cluster of Excellence investigating neurodegenerative diseases. "However, very different things happen at the molecular level. This means that an active substance that is ineffective in one ALS subtype may well be helpful in another. Previous clinical studies were only able to look at the effects across all patients and may not have identified substances effective for an individual subtype."

While in one common subtype genes associated with inflammatory processes and immune responses were affected, in another there were mainly disturbances in the transcription of DNA into RNA molecules. In two others, different signs of oxidative stress were found in the cells. The researchers assume that the ALS subtype may change over the course of the disease.

Promising drug identified

Men develop ALS around 1.2 times more frequently than women. The breakdown of the molecular processes also revealed clear differences between the sexes. While the four subtypes appear to occur equally frequently in both sexes, the researchers found a significantly larger number of altered gene products in men. From the researchers' point of view, this could mean that men and women will have to be treated differently in future.

Through the multi-omics analysis, the researchers also identified a signaling pathway that could be a particularly suitable target for new drugs against ALS. "This signaling pathway, MAPK, is well described in neurobiology and plays a role in various, although by no means all, processes in ALS," says Prof. Stefan Bonn, co-last author of the study and Director of the Institute for Medical Systems Biology at the University Medical Center Hamburg Eppendorf (UKE). From the researchers' point of view, it would therefore be promising to repurpose an approved cancer drug that acts on MAPK for ALS.

Technical University of Munich / Klinikum rechts der Isar / Thomas Einberger: Prof. Paul Lingor is the head of the consortium that conducted the study.

Basis for future studies

The study is based on tissue samples from deceased ALS patients and additional investigations using mouse models of the disease. "An important next step is to find a way to determine the ALS subtype of patients while they are still alive - we are currently working on this," says Paul Lingor. "We believe that our study made an important contribution in the search for causes and therapies for ALS. Our findings have brought us a good deal closer to a more personalized and therefore more effective therapy."

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