Related Experiment Videos
Iron: deficiencies and requirements
1Laboratoire de Pharmacologie Cellulaire & Moléculaire, Université de Paris Sud, Faculté de Pharmacie, Chatenay Malabry, France. haim.tapiero@cep.u-psud.fr
Insights
Iron deficiency anemia affects millions of children and pregnant women globally. Understanding iron absorption, transport, and regulation is key to developing effective interventions like weekly iron supplementation.
Area of Science:
- Nutritional Science
- Biochemistry
- Human Physiology
Background:
- Iron deficiency anemia is a significant global health issue, affecting 46% of children and 48% of pregnant women worldwide.
- The majority of anemia cases are attributed to insufficient iron levels.
- Iron is essential for numerous physiological processes, but its toxicity necessitates strict regulatory mechanisms.
Purpose of the Study:
- To review current data on iron regulatory mechanisms, dietary iron sources, and physiological iron requirements.
- To highlight key molecular players in iron homeostasis, such as the transferrin-transferrin receptor system and iron regulatory proteins (IRPs).
- To discuss the potential of alternative iron supplementation strategies for managing iron deficiency.
Main Methods:
- Review of existing human and animal studies on iron absorption and regulation.
- Analysis of data on iron transport systems, including transferrin and its receptor.
- Examination of the role of iron regulatory proteins (IRPs) and iron-responsive elements (IREs) in cellular iron management.
Main Results:
- Amino acids and peptides have been shown to influence intestinal iron absorption.
- The transferrin-transferrin receptor system is crucial for nonheme iron transport and uptake between organs.
- Iron regulatory proteins (IRPs) and iron-responsive elements (IREs) provide a molecular basis for maintaining iron homeostasis and preventing toxicity.
Conclusions:
- Iron requirements are significantly elevated during pregnancy, necessitating careful management.
- Weekly iron supplementation is being investigated as a potentially effective public health strategy to combat iron deficiency, particularly in vulnerable populations.
- Further research into iron metabolism and supplementation is vital for addressing the global burden of iron deficiency anemia.
Abstract:
A report from the World Health Organization estimates that 46% of the world's 5- to 14-year-old children are anemic. In addition, 48% of the world's pregnant women are anemic. A majority of these cases of anemia are due to iron deficiency. Our aim here is to review the latest data on iron regulatory mechanisms, iron sources and requirements. Human and animal studies have shown that amino acids and peptides influence iron absorption from the intestinal lumen. Inter-organ transport and uptake of nonheme iron is largely performed by the complex transferring-transferring receptor system. Moreover, the discovery of cytoplasmic iron regulatory proteins (IRPs) has provided a molecular framework from which we understand the coordination of cellular iron homeostasis in mammals. IRPs and the iron responsive elements (IREs) to which they bind allow mammals to make use of the essential properties of iron while reducing its potentially toxic effect. Physiologic iron requirements are three times higher in pregnancy than they are in menstruating women (approximately 1200 mg must be acquired from the body's iron store or from the diet by the end of pregnancy). The administration of iron supplements weekly instead of daily in humans has been proposed and is being actively investigated as a viable means of controlling iron deficiency in populations, including pregnant women.