Heparin-binding Epidermal Growth Factor-Like Growth Factor Promotes Enterocyte Migration and Proliferation in Neonatal Rats With Necrotizing Enterocolitis

J Pediatr Surg. 2007 Jan;42(1):214-20. doi: 10.1016/j.jpedsurg.2006.09.055.

Abstract

Purpose: We have shown that heparin-binding epidermal growth factor-like growth factor (HB-EGF) decreases experimental necrotizing enterocolitis (NEC). Intestinal epithelial cell (IEC) migration (restitution) and proliferation are key elements in recovery from intestinal injury. Here, we investigated whether the beneficial effects of HB-EGF are mediated, in part, by its ability to affect these processes.

Methods: Necrotizing enterocolitis was induced in newborn rats by exposure to stress (hypoxia, hypothermia, hypertonic feedings, and lipopolysaccharide), with pups receiving different doses of HB-EGF (0, 25, 50, 100, 200, 400, 600, and 800 microg/kg). To investigate the effect of HB-EGF on enterocyte proliferation and migration, bromodeoxyuridine was administered intraperitoneally 18 hours before sacrifice, with intestine subjected to bromodeoxy-uridine immunohistochemistry.

Results: The incidence and severity of experimental NEC decreased, and the survival rate increased, with increasing doses of HB-EGF. Results were confirmed using scanning electron microscopy. Migration of IEC in breast-fed pups was 7.07 microm/h, decreased significantly to 2.29 microm/h in stressed pups, and was significantly improved at 5.95 microm/h in pups subjected to stress but treated with HB-EGF (P < .05). Quantification of IEC proliferation revealed 208 (+) cells per high-power field (HPF) in breast-fed pups, which decreased significantly to 99 (+) cells per HPF in stressed pups and increased to 190 (+) cells per HPF in stressed pups treated with HB-EGF (P < .05).

Conclusions: These results demonstrate that HB-EGF protects newborn rats from experimental NEC in a dose-dependent fashion. The ability of HB-EGF to protect the intestines from NEC is due, in part, to the ability of HB-EGF to preserve enterocyte migration and proliferation.

Publication types

  • Evaluation Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Newborn
  • Cell Movement / drug effects*
  • Cell Proliferation / drug effects*
  • Disease Models, Animal
  • Enterocolitis, Necrotizing / physiopathology*
  • Enterocolitis, Necrotizing / therapy
  • Enterocytes / drug effects*
  • Epidermal Growth Factor / pharmacology*
  • Heparin-binding EGF-like Growth Factor
  • Intercellular Signaling Peptides and Proteins
  • Rats
  • Rats, Sprague-Dawley

Substances

  • Hbegf protein, rat
  • Heparin-binding EGF-like Growth Factor
  • Intercellular Signaling Peptides and Proteins
  • Epidermal Growth Factor