Microbial Metabolite Signaling Is Required for Systemic Iron Homeostasis

Area of Science:

• Microbiology
• Nutritional Science
• Gastroenterology

Background:

• Iron is vital for all life, and its regulation is crucial for host health and microbial balance.
• The interplay between gut microbes and host iron metabolism, especially during iron limitation, remains poorly understood.
• Symbiotic relationships depend on nutrient availability and host-microbe interactions.

Purpose of the Study:

• To investigate how gut bacteria influence host iron absorption and storage.
• To identify microbial mechanisms that regulate intestinal iron homeostasis.
• To explore the role of microbial metabolites in systemic iron balance.

Main Methods:

• High-throughput screening of microbial metabolites.
• Assessing the impact of metabolites on hypoxia-inducible factor 2α (HIF-2α) signaling.
• Measuring changes in host iron transport and storage proteins (e.g., ferritin).
• Identifying specific microbial compounds responsible for observed effects.

Main Results:

• Indigenous gut bacteria produce metabolites that inhibit host intestinal iron absorption.
• These metabolites suppress hypoxia-inducible factor 2α (HIF-2α), a key regulator of iron absorption.
• Microbial metabolites also increase ferritin levels, promoting iron storage within the host.
• 1,3-diaminopropane (DAP) and reuterin were identified as HIF-2α inhibitors.
• DAP and reuterin demonstrated efficacy in ameliorating systemic iron overload.

Conclusions:

• Gut microbiota actively regulate host iron homeostasis through metabolic crosstalk.
• Microbial metabolites like DAP and reuterin offer a novel therapeutic strategy for iron overload disorders.
• Understanding these intestine-microbiota interactions is essential for maintaining systemic iron balance.