Changes of iron dynamics in the duodenum and bone marrow under partial gravity condition in mice

Area of Science:

• Space biology
• Astrobiology
• Human physiology

Background:

• Long-term space missions necessitate understanding physiological changes.
• Spaceflight can disrupt iron metabolism, leading to anemia, muscle, and bone loss.
• Mechanisms of intestinal iron absorption in space are not well understood.

Purpose of the Study:

• Investigate iron dynamics in the duodenum and bone marrow of mice under partial gravity (PG).
• Assess potential alterations in iron absorption and storage due to simulated spaceflight conditions.

Main Methods:

• Analyzed duodenal and bone marrow tissues from mice reared in PG (1/6G) versus ground gravity (CG: 1G).
• Utilized Perls staining for iron distribution, measured iron concentrations.
• Quantified iron regulatory proteins (ferritin heavy chain, divalent metal transporter 1, ferroportin) via molecular and cellular assays.

Main Results:

• Reduced duodenal iron staining, concentration, and ferritin heavy chain expression in PG mice.
• Attenuated expression of iron transporters (divalent metal transporter 1, ferroportin) in PG mice.
• Decreased iron and ferritin heavy chain expression in bone marrow of PG mice.

Conclusions:

• Partial gravity exposure leads to reduced iron retention in the duodenum.
• The space environment may impair intestinal iron absorption.
• Findings suggest a potential risk for spaceflight-induced anemia.