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Home NEWS Science News Health

Revealing the mystery behind the threat of non-alcoholic liver disease

Bioengineer by Bioengineer
July 13, 2021
in Health
Reading Time: 3 mins read
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Credit: Helmholtz Zentrum München / Anne Loft

Non-alcoholic fatty liver disease is the most common liver disorder worldwide and is present in approximately 25 percent of the world’s population. Over 90 percent of obese, 60 percent of diabetic, and up to 20 percent of normal-weight people develop it. A key feature of the condition is the accumulation of fat in the liver. A liver can remain fatty without disturbing normal function; however, fat accumulations may progress into a so-called non-alcoholic steatohepatitis – an aggressive form of the non-alcoholic fatty liver disease combined with inflammation and sometimes fibrosis. Non-alcoholic steatohepatitis can lead to further complications such as liver cirrhosis, primary liver cancer and eventually death.

Liver fibrosis is a strong predictor of long-term mortality in patients with non-alcoholic fatty liver disease. The mechanisms underlying the progression from the comparatively benign fatty liver state to advanced non-alcoholic steatohepatitis and liver fibrosis are incompletely understood. “Understanding the mechanism by which this condition becomes life threatening is key in our quest for the discovery of therapeutic solutions and preventative measures,” said Stephan Herzig.

Loss of identity results in dysfunction

The researchers used comparative genomics to analyze mechanisms that control the development and specialized functions of the most abundant cell type in the liver, the hepatocyte. “Our results demonstrated that during progression to non-alcoholic steatohepatitis, hepatocytes suffer from partial identity loss, they are re-programmed,” explained Anne Loft, first co-author of the article.

The hepatocyte reprogramming is tightly controlled by a network of proteins acting as molecular switches, so-called ‘transcription factors’. Their activity results in the dysfunction of hepatocytes. The network of transcription factors that controls this process also plays a role in fibrosis progression. “These findings are important because they unravel the cellular mechanisms underlying non-alcoholic steatohepatitis. Knowing about the role of the protein networks and the identity loss of hepatocytes gives us potential intervention targets for the development of effective therapies” says Ana Alfaro, first co-author of the article.

Future work

Based on these findings, it will now be possible to develop novel approaches to effectively target certain nodes in the protein network to prevent disease progression or even revert existing fibrosis, something that is still not possible to-date.

###

About the people

Stephan Herzig is Director of the Helmholtz Diabetes Center at Helmholtz Zentrum München. He holds the Chair for Molecular Metabolic Control at the Technical University of Munich and an Honorary Chair at Heidelberg University. Anne Loft and Ana Alfaro are first co-authors of the study at Helmholtz Zentrum München. All are part of the German Center for Diabetes Research (DZD).

Helmholtz Zentrum München

Helmholtz Zentrum München is a research center with the mission to discover personalized medical solutions for the prevention and therapy of environmentally-induced diseases and promote a healthier society in a rapidly changing world. It investigates major diseases which develop from the interaction of lifestyle, environmental factors and personal genetic background, focusing particularly on diabetes mellitus, allergies and chronic lung diseases. Helmholtz Zentrum München is headquartered in Neuherberg in the north of Munich and has about 2,500 staff members. It is a member of the Helmholtz Association, the largest scientific organization in Germany with more than 43,000 employees at 18 research centers.

Media Contact
Verena Schulz
[email protected]

Original Source

https://www.sciencedirect.com/science/article/abs/pii/S1550413121002758

Related Journal Article

http://dx.doi.org/10.1016/j.cmet.2021.06.005

Tags: LiverMedicine/Health
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