A single protein decides how starving cells burn stored fat
Xue H, Hu X, Yang Z, Cao Y, Zhu Q
Plant Signaling
This one's for the cell biology curious rather than the garden: it's mouse liver and human cell research with no direct plant connection, though the underlying question of how living things ration stored energy during stress echoes what happens when a drought-stressed tree taps its own reserves.
Researchers studying mouse and human cells found a protein called PISD that acts like a switch. When cells are starving, this protein either helps move stored fat directly into the cell's power plants (mitochondria) to be burned for energy, or steps aside and lets a separate cleanup process break the fat down instead. The same protein can't do both at once, so it controls which energy strategy the cell uses.
Key Findings
PISD-LD, a form of the enzyme phosphatidylserine decarboxylase located on lipid droplets, creates physical contact points between lipid droplets and mitochondria
Knocking down PISD-LD caused lipid droplets to grow larger and reduced fatty acid transport and burning in mitochondria
PISD-LD blocks a fat-recycling pathway (lipophagy) by physically preventing the receptor protein Spartin from binding LC3, and this effect was also observed regulating lipid metabolism in mouse liver
chevron_right Technical Summary
Scientists discovered a protein switch in animal cells that decides whether fat droplets get burned for energy in mitochondria or broken down through a cellular recycling process, helping explain how cells manage energy during starvation.
Abstract Preview
Original paper
PISD acts as a switch between lipophagy and fatty acid transfer to mitochondria.
Fatty acids (FAs) are transported from lipid droplets (LDs) to mitochondria for β-oxidation during cell starvation. Starvation also triggers engulfment of LDs by autophagosomes and their subsequent...
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