Transcriptomic analysis identifies lactoferrin-induced quiescent circuits in neonatal macrophages

Area of Science:

• Immunology
• Neonatal Biology
• Molecular Biology

Background:

• The neonatal gut immune system faces microbial antigens at birth, requiring mechanisms to prevent inflammation and maintain barrier integrity.
• Human lactoferrin (hLF), abundant in colostrum, modulates macrophage function and may induce immune tolerance in the neonatal gut.

Purpose of the Study:

• To investigate the transcriptional changes induced by human lactoferrin (hLF) in neonatal monocyte-derived macrophages.
• To understand hLF's role in establishing immune homeostasis in the developing neonatal intestine.

Main Methods:

• Cord blood monocytes were differentiated with M-CSF, with or without hLF.
• Cells were stimulated with LPS or left untreated, followed by microarray analysis.

Main Results:

• hLF induced cell cycle arrest (G2/M phase) and IL-4/IL-13-like signaling.
• hLF altered extracellular matrix interaction and cell-cell interaction.
• hLF treatment abrogated LPS-induced transcriptional changes, indicating tolerance.

Conclusions:

• hLF promotes a shift towards an M2-like homeostatic and quiescent phenotype in neonatal macrophages.
• hLF attenuates pro-inflammatory signaling, demonstrating its ontogenetical relevance in the neonatal intestine.
• The observed anergy to LPS highlights hLF's therapeutic potential for inflammatory conditions.