Plate Nº 70 · recorded October 7, 2026
Biology & EvolutionReported finding
Blood Flow Tells Liver Cells What Job to Do, Mouse Study Finds
Mouse study in Nature Communications shows blood flow's physical forces instruct liver cell jobs via Wnt signals from vessels, not oxygen or nutrient gradients.
By Priya Raman3 min read638 words
In brief
- The study appeared in Nature Communications in 2026 (DOI: 10.1038/s41467-026-76966-7).
- Researchers from Heidelberg University's Medical Faculty Mannheim and the German Cancer Research Center (DKFZ) conducted the work in mouse models.
- Hemodynamic forces, not oxygen or metabolic gradients, determine which molecular programs liver endothelial cells activate.
- Endothelial cells translate blood flow forces into localized Wnt signals that instruct liver cell identity and metabolism.
- The mechanism may inform future therapies for chronic liver disease, fibrosis and liver cancer.
Blood flow — not oxygen or nutrient gradients — decides which molecular jobs liver cells take on, according to a mouse study published in Nature Communications in 2026 by researchers from the Medical Faculty Mannheim of Heidelberg University and the German Cancer Research Center (DKFZ).
The team found that the endothelial cells lining the liver's smallest blood vessels continuously sense the physical forces generated by circulating blood. In response, these cells switch on distinct molecular programs and release highly localized Wnt signals — molecular messages that tell neighboring liver cells what functions to perform.
"Our work changes the way we think about how blood vessels control organ function," said senior author Hellmut Augustin. "Blood vessels are not passive pipelines. They actively measure mechanical forces generated by blood flow and translate them into molecular instructions that organize the surrounding tissue."
Why does the liver need zones?
The liver handles a long list of essential tasks: processing and storing nutrients, detoxifying the body, and producing important blood proteins. But liver cells do not all do the same work. Depending on where a cell sits within a liver lobule — the liver's basic structural unit — different metabolic programs run. Researchers call this spatial division of labor "metabolic zonation."
Blood vessels play a central role in organizing this map. Endothelial cells, which line the smallest vessels known as liver sinusoids, release so-called angiocrine signals to the liver cells around them. These signals directly shape what neighboring cells do.
That raised a question scientists had not answered: how do endothelial cells know which signals to produce in the first place?
How does blood flow become instructions?
The new study offers an answer. Using genetically engineered mouse models, single-cell transcriptomics (a method that measures gene activity in individual cells), spatial proteomics and biomechanical analyses, the researchers showed that liver endothelial cells constantly monitor the mechanical forces of blood flow — known as hemodynamic forces.
These physical forces, rather than oxygen levels or metabolic gradients, establish distinct molecular programs inside endothelial cells. Those programs let the cells produce Wnt signals in precise locations, instructing liver cell identity and metabolism.
The researchers also found that endothelial cells are themselves spatially organized to receive these signals. Wnt receptors — proteins that catch Wnt signals — sit exactly where the cells release Wnt ligands, the signal molecules themselves. This arrangement creates localized signaling circuits that stabilize the molecular identity of different vascular niches.
"This shows that endothelial cells act like sophisticated biological interpreters," said first author Dr. Ki Hong Lee. "They read physical information from blood flow and convert it into biochemical signals that tell neighboring liver cells which functions they should perform."
Does the effect go beyond liver cells?
Yes. The biomechanical signaling program also shapes the endothelial cells themselves, influencing their form and the molecular connections they build with neighboring vascular cells.
The findings offer one of the clearest mechanistic examples so far of how a tissue's microenvironment gets translated into angiocrine signaling. This concept is gaining recognition in many other organs, including the heart, lung, brain, kidney and bone.
Could this lead to new liver therapies?
Possibly, but any clinical application remains far off. The results come from mouse models and laboratory analyses, and the researchers present them as a mechanistic discovery rather than a tested treatment.
Still, the therapeutic implications are real. Disturbances of liver zonation contribute to chronic liver disease, fibrosis and liver cancer. If future therapies could restore the instructive programs of the liver's vasculature itself, they might work quite differently from today's approaches. Instead of targeting liver cells directly, doctors might one day redirect the vessels that tell those cells what to do.
Publication details: Ki Hong Lee et al., "Haemodynamic control of zonated liver function via instructive vascular Wnt signalling," Nature Communications (2026). DOI: 10.1038/s41467-026-76966-7
via Medical Xpress (Source)
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Senior reporter covering industry trends and analytics at SciBeat.
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