Iron Metabolism, Calcium, Magnesium and Trace Elements: A Review

Area of Science:

• Biochemistry
• Human Physiology
• Nutritional Science

Background:

• Iron (Fe) is vital for human health but requires careful regulation.
• Several other essential minerals and trace elements, including calcium (Ca), magnesium (Mg), copper (Cu), zinc (Zn), lead (Pb), cadmium (Cd), mercury (Hg), and nickel (Ni), share absorption and transport pathways with Fe.
• The interactions between these elements can influence their individual bioavailability and physiological roles.

Purpose of the Study:

• To explore the complex interplay between iron and other essential minerals and trace elements in the human body.
• To understand how imbalances in these elements affect Fe absorption, transport, and metabolism.
• To highlight the potential health implications of these interactions, particularly concerning chronic exposure.

Main Methods:

• Literature review of existing studies on mineral and trace element interactions.
• Analysis of shared protein pathways involved in the absorption and transport of Fe and other elements.
• Examination of documented effects of excess or deficiency of specific elements on Fe status and vice versa.

Main Results:

• Copper (Cu) and cadmium (Cd) can inhibit Fe absorption.
• Excess Fe can negatively impact Cu metabolism, reducing ceruloplasmin (Cp) levels.
• High Fe levels may hinder zinc (Zn) absorption, and transferrin (Trf) can bind to both Zn and Ni.
• Calcium (Ca) inhibits the divalent metal transporter 1 (DMT1), reducing Fe absorption.
• Low Mg concentrations can worsen Fe deficiency.
• Lead (Pb) competitively inhibits Fe distribution, and elevated Cd absorption reduces Fe uptake.
• Mercury (Hg) exposure is linked to increased ferritin, and Ni alters intracellular Fe metabolism.
• Phlebotomy in hemochromatosis patients can increase Cd and Pb levels and affect trace elements in anemia.

Conclusions:

• The balance of essential minerals and trace elements is critical for maintaining iron homeostasis.
• Interactions between elements like Fe, Cu, Zn, Ca, Mg, Pb, Cd, Hg, and Ni significantly influence nutrient metabolism and absorption.
• Further research is needed to fully understand the long-term effects of chronic exposure to various trace elements and their complex interactions with iron.