Eat me: The cell signal of death

Eat me: The cell signal of death
Cut-away pieces of XRCC4 protein travel out of the nucleus to the cell membrane to activate scramblases, turning on an 'eat me' signal recognized by phagocytes. Credit: Mindy Takamiya/Kyoto University iCeMS

Scientists at the Institute for Integrated Cell-Material Sciences (iCeMS) and colleagues in Japan have revealed molecular mechanisms involved in eliminating unwanted cells in the body. A nuclear protein fragment released into the cytoplasm activates a plasma membrane protein to display a lipid on the cell surface, signaling other cells to get rid of it. The findings were published in the journal Molecular Cell.

"Every day, 10 billion cells die and are engulfed by called phagocytes. If this didn't happen, would burst, triggering an auto-immune reaction," explains iCeMS biochemist Jun Suzuki, who led the study. "It is important to understand how dead cells are eliminated as part of our body's maintenance."

Scientists already know that dead cells display an 'eat me' signal on their surface that is recognized by phagocytes. During this process, lipids are flipped between the inner and outer parts of the cell membrane via a variety of proteins called scramblases. Suzuki and his team have already identified several of these lipid-scrambling proteins, but some of their activation mechanisms have been unclear.

To solve this, the team used an array of screening approaches to study the scrambling protein called Xkr4. The broad aim was to single out the genes that are active during cell death and to specifically zoom in on Xkr4 and its associated proteins to understand how they interact.

"We found that a nuclear protein fragment activates Xkr4 to display the 'eat me' signal to phagocytes," says iCeMS cell biologist Masahiro Maruoka, the first author of the study.

Specifically, the scientists found that cell death signals lead to an enzyme cutting a nuclear protein called XRCC4. A fragment of XRCC4 leaves the nucleus, activating Xkr4, which forms a dimer: the linking of identical pieces into configurations. Both XRCC4 binding and dimer formation are necessary for Xkr4 to ultimately transfer lipids on the to alert phagocytes.

Xkr4 is only one of the scrambling proteins. Others are activated much faster during . The team now wants to understand when and why the Xkr4 pathway is specifically activated. Since it is strongly expressed in the brain, it is likely important for . "We are now studying the elimination of unwanted cells or compartments in the brain to understand this process further," says Maruoka.

More information: Masahiro Maruoka et al, Caspase cleavage releases a nuclear protein fragment that stimulates phospholipid scrambling at the plasma membrane, Molecular Cell (2021). DOI: 10.1016/j.molcel.2021.02.025

Journal information: Molecular Cell

Provided by Kyoto University

Citation: Eat me: The cell signal of death (2021, March 26) retrieved 27 February 2024 from
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