New target structure against coronavirus

New target structure against corona
The cells in the top row were treated with the fluoxetine-like molecule AKS466 and then infected with SARS-CoV-2. The cells at the bottom were only infected; more viral RNA is detectable in them (lighter dots). Credit: Jan Schlegel, University of Würzburg

Fluoxetine, a common antidepressant, inhibits the SARS-CoV-2 coronavirus in cell cultures and in preparations from human lung tissue. This was demonstrated by researchers at Julius-Maximilians-Universität (JMU) Würzburg in the summer of 2020. However, the mechanism of this inhibition was unclear, so the team continued their research.

To this end, they developed the molecule AKS466, which is very similar to fluoxetine and also suppresses coronavirus. After extensive comparative studies published in the journal Cells, it is now clear how the antidepressant inhibits the replication of coronaviruses.

Excess of ceramides inhibits the SARS-CoV-2

Fluoxetine, as well as AKS466, trap the viruses in the lysosomes of the cell. Put simply, these are small vesicles in which digestive processes take place. In the lysosomes, both active substances also suppress the activity of an group, the acid ceramidases. This increases the concentration of ceramides, a group of the body's lipids. The excess of ceramides is ultimately responsible for preventing the SARS-CoV-2 coronavirus from reproducing.

"The enzyme ceramidase is a new, completely unexpected target structure for ," says Professor Jochen Bodem from the JMU Institute of Virology and Immunobiology. His group collaborated on this project with the teams of JMU professors Jürgen Seibel (Organic Chemistry) and Markus Sauer (Biotechnology and Biophysics) intensively.

Consequences for therapy research

The new findings are significant for the fight against SARS-CoV-2.

On the one hand, ceramides could be directly suitable as active agents against the virus.

On the other hand, the fluoxetine-like molecule AKS466 might be superior to the original. This is because inhibits the enzyme group of acid sphingomyelinases, leading to side effects when used. AKS466 does not inhibit these enzymes—it should have fewer adverse side effects.

Thus, the Würzburg researchers are showing two new ways that could lead to an improved therapy of SARS-CoV-2 infections. Next, they would like to clarify the question of how the two active substances manage to trap coronaviruses in the lysosomes.

More information: Nina Geiger et al, The Acid Ceramidase Is a SARS-CoV-2 Host Factor, Cells (2022). DOI: 10.3390/cells11162532

Citation: New target structure against coronavirus (2022, August 17) retrieved 22 March 2023 from
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