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Related Experiment Videos

Matrix metalloproteinases in necrotising enterocolitis.

Sylvia Lin Foon Pender1, Christian Braegger, Ute Gunther

  • 1Division of Infection, Inflammation and Repair, Mailpoint 813, Level E, South Academic Block, Southampton General Hospital, Tremona Road, Southampton, SO16 6YD, UK. s.pender@soton.ac.uk

Pediatric Research
|May 9, 2003
PubMed
Summary

Necrotising enterocolitis (NEC) involves elevated TNF-alpha and matrix metalloproteinases (MMPs). Stromelysin-1, an MMP, may cause tissue injury in NEC by degrading the gut

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Area of Science:

  • Neonatal pathology
  • Gastroenterology
  • Immunology

Background:

  • Necrotising enterocolitis (NEC) is a severe neonatal condition linked to inflammation and gut injury.
  • Tumor necrosis factor-alpha (TNF-alpha) and matrix metalloproteinases (MMPs) are implicated in NEC pathogenesis.
  • Previous research indicated TNF-alpha stimulates MMP production in the gut wall.

Purpose of the Study:

  • To investigate the specific role of MMPs in the pathogenesis of NEC in neonates.
  • To analyze the expression of various MMPs and their inhibitors (TIMPs) in NEC-affected infant bowels.

Main Methods:

  • Studied resected bowel tissue from 9 NEC infants and 8 controls with neonatal bowel obstruction.
  • Utilized immunostaining to quantify immune cell populations (monocytes, macrophages, neutrophils, T cells).

Related Experiment Videos

  • Employed RT-PCR for mRNA analysis of TNF-alpha, IFN-gamma, MMPs, and TIMPs.
  • Applied western blotting for protein analysis of MMPs and TIMPs.
  • Used double labeling (immunostaining and in situ hybridization) to identify the cellular source of MMP mRNA.

    • Main Results:

    • NEC tissue showed increased monocytes, macrophages, and neutrophils compared to controls.
    • T cells and IFN-gamma transcripts were unexpectedly low in NEC samples.
    • Elevated TNF-alpha transcripts were detected in NEC tissue.
    • Stromelysin-1 (MMP-3) and TIMP-1 mRNA and protein were upregulated in NEC.
    • Collagenase, gelatinases, and TIMP-2 showed no significant changes.
    • Stromelysin-1 mRNA originated from alpha-smooth muscle actin-positive cells in NEC tissue.

    Conclusions:

    • Stromelysin-1, capable of degrading the mucosal extracellular matrix, is significantly upregulated in NEC.
    • This suggests stromelysin-1 plays a key role in the extensive tissue damage observed in necrotising enterocolitis.
    • The findings highlight stromelysin-1 as a potential therapeutic target for NEC.