Metabolic Catastrophe in Mice Lacking Transferrin Receptor in Muscle

Area of Science:

• Biochemistry
• Cell Biology
• Physiology

Background:

• Transferrin receptor 1 (Tfr1) is essential for cellular iron uptake.
• Its specific roles in non-hematopoietic cells, like skeletal muscle, remain unclear.

Purpose of the Study:

• To investigate the necessity of Tfr1 for iron uptake in skeletal muscle.
• To elucidate the metabolic consequences of muscle-specific Tfr1 deficiency.

Main Methods:

• Utilized a tissue-specific conditional knockout mouse model to inactivate Tfr1 in skeletal muscle.
• Analyzed metabolic parameters, tissue morphology, and iron regulatory markers.

Main Results:

• Skeletal muscle Tfr1 is critical for iron assimilation and energy metabolism.
• Tfr1 inactivation in muscle led to impaired energy production, growth arrest, and altered fatty acid oxidation.
• Systemic effects included metabolic changes in adipose tissue and liver, with hepatic iron deficiency and suppressed hepcidin.

Conclusions:

• Tfr1-mediated iron uptake is indispensable for skeletal muscle function and overall metabolic homeostasis.
• Muscle iron deficiency triggers complex systemic responses affecting multiple organs and iron regulation.
• Findings highlight the intricate interplay between iron homeostasis and metabolism, relevant to metabolic and iron-related diseases.