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Rat brain iron concentration is lower following perinatal copper deficiency
Joseph R Prohaska1, Anna A Gybina
1Department of Biochemistry and Molecular Biology, University of Minnesota, Duluth, Minnesota 55812, USA. jprohask@d.umn.edu
Insights
Copper deficiency in dams during pregnancy significantly lowers brain iron in developing pups. This iron deficiency persists postnatally, impacting brain development and transferrin receptor levels.
Area of Science:
- Neuroscience
- Developmental Biology
- Nutritional Science
Background:
- Copper (Cu) is essential for iron (Fe) metabolism.
- Perinatal development is a critical window for brain Fe accumulation.
- Maternal nutritional status impacts offspring neurodevelopment.
Purpose of the Study:
- To investigate the impact of maternal copper deficiency on brain iron levels in developing rats.
- To assess the relationship between copper deficiency, iron status, and transferrin receptor expression in the brain.
Main Methods:
- Holtzman rats were subjected to copper-deficient (-Cu) or copper-sufficient (+Cu) diets from embryonic day 7.
- Brain iron content was measured at postnatal days 13 (P13) and P24-P26.
- Transcardial perfusion was used to correct for blood iron contamination.
- Immunoblotting was performed to quantify transferrin receptor 1 (TfR1) in brain extracts.
Main Results:
- Maternal -Cu diet resulted in significantly lower brain Fe in pups at P13 and P24.
- Brain Fe was 20% lower in -Cu rats at P24-P26, even after accounting for blood Fe.
- TfR1 levels were elevated in P13 and P24 -Cu rat brains, indicating iron deficiency.
- Post-weaning -Cu rats showed no changes in brain TfR1 or Fe content despite low plasma Fe.
Conclusions:
- Adequate copper nutrition during perinatal development is crucial for proper brain iron accumulation.
- Maternal copper deficiency leads to persistent brain iron deficiency in offspring.
- The developing brain exhibits adaptive responses to iron deficiency, as indicated by TfR1 levels.
Abstract:
Experiments performed with Holtzman rats demonstrated that brain iron (Fe) was lower by postnatal day 13 (P13) in pups born and nursed by dams that began copper-deficient (-Cu) treatment at embryonic day 7. Transcardial perfusion of P24-P26 males and females to remove blood Fe contamination revealed that brain Fe was still 20% lower in -Cu than +Cu rats. Estimated blood content of brain for -Cu rats was greater than for +Cu rats; for all groups, values ranged between 0.43 and 1.03%. Using group-specific data and regression analyses, r = 0.99, relating blood Fe to hemoglobin, brain Fe in non-perfused rats in a replicate study was lower by 33% at P13 and 39% at P24 in -Cu rats. Brain extracts from these rats and from P50 rats from a post-weaning model were compared by immunoblotting for transferrin receptor (TfR1). P24 brain -Cu/+Cu TfR1 was 3.08, suggesting that brains of -Cu rats were indeed Fe deficient. This ratio in P13 rats was 1.44, p < 0.05. No change in P50 -Cu rat brain TfR1 or Fe content was detected despite a 50% reduction in plasma Fe. The results suggest that brain Fe accumulation depends on adequate Cu nutriture during perinatal development.
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