Neutrophils are a type of white blood cell. In fact, most of the white blood cells that lead the immune system's response are neutrophils. In your bloodstream, there are neutrophils that, when faced with a pathogenic threat, will expel their DNA like a net to contain it.
These DNA snares are called neutrophil extracellular traps or NETs. Researchers from Germany and the United States describe an important step in how these NETs are released and how they stop a fungus from establishing an infection in mice and human cells in the journal Developmental Cell.
"This is basically a type of beneficial cell suicide," says first author Borko Amulic, a postdoc in the lab of Arturo Zychlinsky at the Max Planck Institute for Infection Biology and a newly appointed Lecturer at the University of Bristol. "When neutrophils get overwhelmed, when they can no longer deal with a microbial threat by just engulfing it, that's when the NETs are released."
To test this, the researchers inhibited the cell cycle proteins in mouse neutrophils, and found that indeed, fewer NETs were released. Consequently, mice that were no longer to efficiently release NETs were less able to clear fungal infections. Then, they observed human brains with fungal infections and confirmed that our neutrophils are also using cell cycle proteins.
"The ultimate goal for this research is to interfere clinically, either when too few or too many NETs are being produced," says Amulic. "Also, this is just a really fascinating cell biological phenomenon."