Does iron overload in metabolic syndrome affect macrophage profile? A case control study

Area of Science:

• Immunology
• Metabolic Disorders
• Iron Metabolism

Background:

• Dysmetabolic iron overload syndrome (DIOS) is prevalent, but its clinical impact on iron homeostasis is unclear.
• Macrophages play a critical role in regulating iron and inflammation.
• Iron overload may alter monocyte phenotype and macrophage function in DIOS.

Purpose of the Study:

• To investigate the effect of iron overload in DIOS on monocyte phenotype and macrophage gene expression.
• To compare DIOS patients with metabolic syndrome (MetS) and healthy controls.

Main Methods:

• Monocyte phenotyping using Fluorescence-Activated Cell Sorting (FACS).
• Differentiation of monocytes into M2 macrophages with IL-4.
• Real-time PCR analysis of 38 genes related to inflammation, iron metabolism, and M2 phenotype.

Main Results:

• No significant differences in monocyte phenotype were observed across groups.
• DIOS patients exhibited impaired M2 macrophage polarization, with altered expression of four key M2 genes.
• Increased expression of iron metabolism genes, including transferrin receptor 1 (TFRC), was noted in DIOS macrophages compared to MetS.

Conclusions:

• Macrophage polarization to the M2 alternative phenotype is impaired in DIOS.
• This impairment is not linked to a pro-inflammatory profile in DIOS.
• Upregulation of TFRC in DIOS macrophages suggests an adaptive mechanism to mitigate iron toxicity.