Remote ischemic conditioning causes CD4 T cells shift towards reduced cell-mediated inflammation

Area of Science:

• Immunology
• Neonatal Medicine
• Gastroenterology

Background:

• Necrotizing enterocolitis (NEC) is a severe gastrointestinal disease in neonates characterized by immune-mediated intestinal inflammation.
• Remote ischemic conditioning (RIC), a non-invasive limb intervention, has demonstrated protective effects against experimental NEC.

Purpose of the Study:

• To investigate the immune cell-mediated inflammatory response in experimental NEC.
• To evaluate the immunomodulatory effects of RIC on NEC using a mouse model.

Main Methods:

• NEC was induced in mouse pups via formula gavage, lipopolysaccharide, and hypoxia.
• RIC involved cycles of limb ischemia and reperfusion during NEC induction.
• Ileal tissues were analyzed for inflammatory cytokines and T-cell populations (Treg/Th17).

Main Results:

• NEC induced increased pro-inflammatory cytokines (IFNγ, IL1β, IL6, IL17, IL22, TNFα) and decreased anti-inflammatory TGFβ.
• A shift towards Th17 cells was observed in NEC, with an accumulation of CD4+ T-cells.
• RIC treatment reduced pro-inflammatory markers, increased TGFβ, and shifted the Treg/Th17 balance back towards Treg cells.

Conclusions:

• RIC effectively reduces pro-inflammatory markers and enhances anti-inflammatory markers in experimental NEC.
• RIC ameliorates the Treg/Th17 imbalance, supporting its role in modulating cell-mediated inflammation.
• RIC presents a promising, non-invasive therapeutic strategy for reducing inflammation in NEC.