Abstract
Elevated cytokines, especially TNF-α, have been implicated in the pathogenesis of necrotising enterocolitis (NEC). We have previously shown that TNF-α drives the production of matrix degrading enzymes, the matrix metalloproteinases (MMPs), in the gut wall. In this study we have therefore investigated the role of MMPs in the pathogenesis of NEC in neonates. Nine newborn infant nonnecrotic resected bowels with confirmed NEC were studied and 8 newborn infants with neonatal bowel obstructions were used as controls. Immunostaining was used to identify the numbers of monocytes, macrophages, neutrophils, and T cells in the tissue. We used quantitative, competitive RT-PCR to analyze the number of TNF-α, IFN-γ, MMP, and TIMP mRNA transcripts and western blotting to analyze MMP and TIMP protein production. Double labeling (immunostaining and in situ hybridization) was used to identify the phenotype of MMP mRNA expressing cells. We found increased numbers of monocytes, macrophages, and neutrophils in NEC tissue compared with controls. The number of T cells was unexpectedly low in NEC as was the number of IFN-γ transcripts in comparison with the control samples. Increased numbers of transcripts for TNF-α were detected in NEC tissue, as was mRNA expression and protein production for stromelysin-1 and TIMP-1 but not collagenase, gelatinases, or TIMP-2. The cellular source of stromelysin-1 in NEC was α-smooth muscle actin positive cells. These results suggest that stromelysin-1, which has the ability to degrade the mucosal extra-cellular matrix, may be responsible for the extensive tissue injury in infants with NEC.
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Abbreviations
- ECM:
-
extra-cellular matrix
- IFN-γ:
-
interferon gamma
- MMP:
-
matrix metalloproteinase
- NEC:
-
necrotising enterocolitis
- TIMP:
-
tissue inhibitor of metalloproteinase
- TNF-α:
-
tumour necrosis factor-alpha
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Acknowledgements
We thank Professor Martin Kagnoff, University of California at San Diego for a cytokine template and Dr. G. Schultz, University of Florida, for an MMP template (National Eye Institute Grant EY-05587).
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Supported by the Hope Innovation Fund (F31), Wessex Medical Trust, Southampton, United Kingdom.
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Pender, S., Braegger, C., Günther, U. et al. Matrix Metalloproteinases in Necrotising Enterocolitis. Pediatr Res 54, 160–164 (2003). https://doi.org/10.1203/01.PDR.0000072326.23442.C3
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DOI: https://doi.org/10.1203/01.PDR.0000072326.23442.C3
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