This study explored how fibrolamellar carcinoma (FLC) rewires the way its cells generate energy, focusing on calcium inside mitochondria—the cell’s “power plants.” Researchers found that FLC cells have abnormally high mitochondrial calcium levels, which changes how they process nutrients like branched‑chain amino acids.
A key driver of this is the mitochondrial calcium uniporter, a channel that controls how calcium enters mitochondria. In FLC, this uniporter is overactive, and the excess calcium it brings in shuts down normal liver metabolic pathways, including those that break down amino acids and help detoxify waste products.
One important consequence involves ammonia, a toxic byproduct of protein metabolism that the liver normally clears through the urea cycle. Because the uniporter-driven changes suppress this pathway, FLC tumors may contribute to the elevated ammonia levels (hyperammonemia) seen in some patients.
When researchers reduced uniporter activity, these normal metabolic programs switched back on, suggesting the cancer depends on this altered calcium signaling.
Key implications of the study
Overall, the work highlights the uniporter as a key driver of FLC’s unique biology and points to a new potential treatment strategy: targeting mitochondrial calcium signaling to disrupt how these tumors fuel themselves.
The full text of the publication can be accessed here.
Note: This study was funded by a grant from FCF.