Acidosis, Iron Dyshomeostasis and Inflammatory Injury.

Area of Science:

• Gastroenterology
• Cell Biology
• Biochemistry

Background:

• Iron absorption involves ferrireduction, apical import via divalent metal transporter 1 (DMT1), and basolateral export by ferroportin (FPN).
• Cellular iron uptake in peripheral tissues relies on transferrin (Tf)-bound iron endocytosis and endosomal DMT1 activity.
• Acidosis, common in inflammation, impacts iron metabolism and transport.

Purpose of the Study:

• To elucidate the mechanisms of iron dysregulation under acidosis and inflammation.
• To investigate the role of DMT1 and proton pumps in cellular iron overload.
• To explore potential therapeutic strategies targeting non-transferrin bound iron (NTBI) transport.

Main Methods:

• Analysis of iron transport pathways in enterocytes and peripheral tissues.
• Investigation of the effects of altered acid milieu on metal transporters.
• Examination of the interplay between acidosis, inflammation, and iron homeostasis.

Main Results:

• Acidosis and inflammation enhance DMT1 expression and activity, increasing Fe2+ uptake.
• These conditions promote iron sequestration within cells by inhibiting ferroportin (FPN)-mediated export.
• Disruption of iron homeostasis leads to potentially harmful intracellular iron accumulation.

Conclusions:

• Acidosis and inflammation synergistically promote cellular iron overload through DMT1.
• Inhibition of NTBI transport presents a potential therapeutic avenue for iron overload disorders.
• Understanding these mechanisms is crucial for managing iron-related pathologies.