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The Early Endosome: Endocytosis of Transferrin01:28

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Updated: May 10, 2025

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Transferrin receptors.

Qian Guo1, Christopher Qian2, Xinyu Wang3

  • 1Laboratory of Drug Delivery, School of Medicine, Shanghai University, Shanghai, China. qian_guo@shu.edu.cn.

Experimental & Molecular Medicine
|April 22, 2025
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Summary
This summary is machine-generated.

Transferrin receptors (TfR) are crucial for cellular iron uptake. This review details recent advances in understanding the structures and functions of four TfR types, vital for maintaining iron homeostasis.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • The transferrin receptor (TfR) mediates cellular iron uptake via endocytosis, a critical process for most cells.
  • Understanding TfR function is key to comprehending cellular iron acquisition and overall iron homeostasis.
  • Significant progress has been made in TfR research over the last three decades.

Purpose of the Study:

  • To review recent advances in transferrin receptor (TfR) research.
  • To discuss the structures and functions of four distinct TfR types: TfR1, TfR2, TfR3, and TfR4.
  • To highlight the importance of TfR diversity in ensuring tissue-specific iron supply.

Main Methods:

  • Literature review focusing on recent studies of TfR.
  • Comparative analysis of the structures and functions of TfR1, TfR2, TfR3, and TfR4.
  • Discussion of the roles of different TfRs in various cell types and organs.

Main Results:

  • Identification and characterization of four types of transferrin receptors (TfR1, TfR2, TfR3, TfR4).
  • Elucidation of distinct cellular localization and functional roles for each TfR type.
  • Demonstration that these receptors operate in different cells and at different times to meet iron demands.

Conclusions:

  • The four identified TfR types (TfR1, TfR2, TfR3, TfR4) exhibit diverse structures and functions.
  • Differential expression and activity of TfRs are essential for maintaining systemic iron balance.
  • Continued research into TfRs will further illuminate mechanisms of iron homeostasis and related disorders.