Study Links Dietary Fructose to Liver Disease Progression Through Iron Absorption Pathway
A new preprint study reports that dietary fructose promotes metabolic dysfunction-associated steatohepatitis (MASH) and hepatocellular carcinoma (HCC) by enhancing intestinal iron absorption through a specific molecular pathway involving the KHK/PKM2/HIF-2α axis. The research identifies how fructose triggers metabolic changes that stabilize HIF-2α, leading to increased iron absorption and subsequent liver disease progression. The findings suggest potential therapeutic targets—KHK and PKM2 inhibitors—that could interrupt this fructose-driven pathway and slow liver disease development.
Researchers have identified a molecular mechanism by which dietary fructose drives the progression of MASH and hepatocellular carcinoma, two serious liver conditions. The study demonstrates that fructose stabilizes the protein HIF-2α in the intestine through a chain of metabolic events involving the enzymes KHK and PKM2, which in turn increases iron absorption. The researchers showed that blocking KHK or PKM2 reduces HIF-2α stabilization and iron absorption in mouse models, while mice lacking the KHK gene develop iron deficiency. Importantly, the progression of MASH and HCC in response to dietary fructose appears to depend on this iron-absorption mechanism. The authors propose that inhibitors targeting KHK or PKM2 could represent new therapeutic approaches to prevent fructose-driven liver disease.
What's missing
The study's limitations include reliance on mouse models, which may not fully translate to human physiology; the extent to which this pathway operates in humans consuming typical fructose levels remains to be determined. Additionally, the study does not address whether other dietary or genetic factors modulate this pathway, or whether the findings apply equally across different populations.
What different sources said
- bioRxivCenter
Dietary fructose promotes MASH/HCC progression through enhanced intestinal HIF-2α-dependent iron absorption
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