Background: We have previously reported evidence of in vitro sensitisation to cow's milk protein in peripheral blood mononuclear cells (PBMCs) in preterm infants with necrotising enterocolitis (NEC). In the present study, we document the changes in the PBMC responses to stimulation with mitogen (phytohaemagglutinin) and cow's milk proteins β-lactoglobulin (β-lg) and casein over time: from the acute presentation of NEC, to initial recovery (reinitiation of enteral feeds), to full recovery (full feeding).
Methods: Of the 14 preterm infants recruited with acute NEC, 12 were followed until fully enterally fed (2 died during the acute phase). Cytokine secretion (interferon-γ [IFN-γ], interleukin 4, [IL-4], IL-10, and transforming growth factor-β1 [TGF-β1]) by PBMCs in response to stimulation by phytohaemagglutinin, β-lg, and casein was measured by enzyme-linked immunospot in the acute phase and subsequently at recovery and full recovery.
Results: The high levels of cytokine secretion (IFN-γ, IL-4, IL-10, and TGF-β1) observed in response to β-lg and casein in the acute phase increased by a further 50% to 100% at recovery (P < 0.005). At full recovery (full feeding), however, IFN-γ, IL-4, and IL-10 secretion response had returned to, or below, acute-phase levels, whereas the augmented TGF-β1 response was maintained (P = 0.005 vs acute level). This response pattern was similar for casein, and did not appear to be influenced by the nature of the feed used following NEC (breast milk/formula/hydrolysed formula).
Conclusions: The evolution of the cytokine response profile in parallel with the clinical recovery from NEC is consistent with a putative role for TGF-β1 in regulation of inflammation, and possibly also oral tolerance.
*Division of Paediatrics, Obstetrics, and Gynaecology, Imperial College
†Department of Neonatal Medicine, Chelsea and Westminster Hospital
‡Division of Investigative Sciences, Imperial College, London, UK.
Address correspondence and reprint requests to Dr Shu-Ling Chuang, Consultant Neonatologist, Chelsea and Westminster Hospital, 369 Fulham Rd, London SW10 9NH, UK (e-mail: Shu-Ling.Chuang@Chelwest.nhs.uk).
Received 8 December, 2011
Accepted 2 June, 2012
The study was supported by Chelsea and Westminster Joint Research Committee small grant award given by Westminster Medical School Research Trust and Chelsea and Westminster Health Charity (Awardee S.-L. Chuang).
The authors report no conflicts of interest.