Copper Homeostasis in Mammals, with Emphasis on Secretion and Excretion. A Review

Area of Science:

• Biochemistry
• Physiology
• Homeostasis

Background:

• Mammalian copper (Cu) metabolism is characterized by tight regulation of tissue and fluid concentrations.
• This regulation is achieved by balancing dietary intake with excretion, primarily through bile and feces.
• A significant, yet often overlooked, aspect is the substantial internal recycling of copper.

Purpose of the Study:

• To review current knowledge on mammalian copper homeostasis.
• To elucidate the complexities of copper balance, emphasizing internal recycling.
• To identify areas requiring further research in copper metabolism.

Main Methods:

• Literature review of existing research on copper metabolism and homeostasis.
• Analysis of the balance between copper intake, excretion, and internal recycling.
• Synthesis of information regarding cellular and systemic copper transport.

Main Results:

• Most absorbed copper originates from digestive fluids, indicating significant re-utilization.
• Extensive internal copper recycling occurs between cells, blood, and interstitial fluids.
• Existing models of copper homeostasis often underestimate the contribution of recycling.

Conclusions:

• Copper homeostasis is a complex process involving both excretion and extensive internal recycling.
• Understanding the full scope of copper recycling is critical for comprehending mammalian copper metabolism.
• Further research is needed to fully characterize the mechanisms and significance of internal copper recycling.