Hepcidin expression in adipose tissue increases during cardiac surgery.

Area of Science:

• Biochemistry
• Physiology
• Molecular Biology

Background:

• Hepcidin regulates iron metabolism and is implicated in anemia of chronic disease.
• Adipose tissue hepcidin expression is elevated in obesity linked to inflammation.
• The role of adipose tissue hepcidin during acute inflammation is not well understood.

Purpose of the Study:

• To investigate alterations in hepcidin mRNA expression within subcutaneous and epicardial adipose tissue during an acute-phase reaction (surgery).
• To examine the expression of other iron-related genes in adipose tissue concurrently with hepcidin.
• To explore the potential contribution of adipose tissue hepcidin to systemic iron dysregulation during inflammation.

Main Methods:

• Isolation of human subcutaneous and epicardial adipose tissue before and after surgical procedures.
• Quantification of hepcidin mRNA and iron-related gene (transferrin receptor 1, divalent metal transporter 1, ferritin, ferroportin) expression using real-time RT-PCR.
• Analysis of changes in gene expression in response to the acute inflammatory stimulus of surgery.

Main Results:

• Hepcidin mRNA expression significantly increased in subcutaneous adipose tissue post-surgery, but not in epicardial adipose tissue.
• Cytokine levels were elevated, and iron metabolism parameters exhibited typical inflammation-induced alterations.
• These findings indicate a differential response of adipose tissue depots to acute inflammation regarding hepcidin regulation.

Conclusions:

• Acute inflammatory changes can modulate hepcidin expression in subcutaneous adipose tissue.
• This localized hepcidin response may contribute to systemic iron metabolism disturbances observed during inflammation.
• Adipose tissue emerges as a potential player in the complex interplay between inflammation and iron homeostasis.