Blocking NF-κB Activation in Ly6c⁺ Monocytes Attenuates Necrotizing Enterocolitis

Area of Science:

• Neonatal immunology
• Gastroenterology
• Inflammatory diseases

Background:

• Necrotizing enterocolitis (NEC) is a severe intestinal disease in premature infants.
• The neonatal inflammatory response involves macrophages, but the role of NF-κB in myeloid cells during NEC is unknown.
• Previous studies implicated NF-κB in NEC-induced intestinal injury.

Purpose of the Study:

• To investigate the role of NF-κB in myeloid cells during NEC.
• To determine if NF-κB activation in monocytes is critical for NEC pathogenesis.

Main Methods:

• Deletion of inhibitor of kappaB kinase β (IKKβ) in lysozyme M (Lysm)-expressing cells (monocytes) in a mouse model of NEC.
• Analysis of monocyte recruitment, differentiation, and NF-κB activation.
• Assessment of NEC incidence, severity, and survival rates.

Main Results:

• NF-κB activation is essential for NEC-induced monocyte recruitment and differentiation into macrophages in the neonatal intestine.
• IKKβ deletion in Lysm+ cells significantly improved survival and reduced NEC severity.
• NF-κB deletion in intestinal epithelial cells did not affect NEC severity.

Conclusions:

• NF-κB signaling in Ly6c+ monocytes is a critical driver of NEC pathogenesis.
• Targeting NF-κB activation in monocytes represents a potential therapeutic strategy for NEC.
• Monocyte recruitment and differentiation are key cellular events in NEC development.