New insights into how a deadly intestinal disease in preemies develops

Building on their previous work, which found that decreased development of tiny blood vessels in the intestines contributes to NEC, researchers demonstrate in the current study that macrophages, which are a type of white blood cells and part of the innate immune system, play a critical role in this process. They also show that a growth hormone called insulin-like growth factor-1 (IGF-1), which macrophages produce, stimulates microvascular development in the intestine.

In a mouse model, they found that macrophages and IGF-1 are significantly reduced in the perinatal intestine prior to NEC development. When mice were treated with IGF-1, their intestines grew more blood vessels and were less susceptible to NEC.

"Blood vessel growth in the neonatal intestine is critical to provide sufficient oxygen and nutrients to intestinal cells, and defective vascular development increases susceptibility to NEC. We identified IGF-1 as a novel mechanism by which macrophages promote intestinal microvasculature development in neonatal mice that protects against NEC," said senior author Isabelle De Plaen, MD, a neonatologist and researcher at Lurie Children's and Professor of Pediatrics at Northwestern University Feinberg School of Medicine. "We then confirmed the relevance of our findings in human NEC. These new insights open the door to developing novel treatment approaches that could help preserve intestinal embryonic macrophage IGF-1 production to promote healthy intestine development in premature infants."

Research at Ann & Robert H. Lurie Children's Hospital of Chicago is conducted through the Stanley Manne Children's Research Institute. The Manne Research Institute is focused on improving child health, transforming pediatric medicine and ensuring healthier futures through the relentless pursuit of knowledge. Lurie Children's is ranked as one of the nation's top children's hospitals by U.S. News & World Report. It is the pediatric training ground for Northwestern University Feinberg School of Medicine.