Lactoferrin for Prevention of Sepsis in Infants

Neonatal mortality is an important global public health challenge. Approximately 4 million neonatal deaths per year occur in developing countries, accounting for 40% all of deaths in children under 5. Infection, birth asphyxia and consequences of premature birth/low birth weight are responsible for the majority of these deaths. Although advances in neonatal intensive care led to improved survival of premature infants, sepsis continues to be an important cause of morbidity and mortality worldwide.

Lactoferrin, an iron-binding protein with multiple physiological functions (anti-microbial, anti-inflammatory, and immunomodulatory), is one of the most important proteins present in mammalian milk. Our hypothesis is that lactoferrin given as a daily oral food supplement to preterm infants will improve their health by mimicking its protective role in milk. There is a vast literature showing in vitro and animal model benefits of lactoferrin. However, there are few clinical studies designed to translate this knowledge into patient care. A recent Italian study showed that lactoferrin given to low-birth weight infants reduces incidence of sepsis (17% vs. 6%) and death. Whether lactoferrin has an effect in higher risk populations and an impact on subsequent neurodevelopment and growth remains to be determined.

Specific aim 1: The investigators will test the hypothesis that bovine lactoferrin supplementation prevents serious infections in preterm infants. The investigators will conduct a randomized placebo-controlled double blind study in 414 premature infants < 2000 g in Neonatal Units in Lima, Peru to determine whether bovine lactoferrin prevents late-onset sepsis or sepsis-associated death.

This hypothesis is based on lactoferrin´s antimicrobial and immunomodulating activities. Lactoferrin protects against pathogens in multiple ways: it sequesters iron essential for bacterial growth; binds to lipopolysaccharide (LPS) on the cell surface of Gram negative bacteria, disrupting the bacterial cell membrane; it has anti-lipoteichoic acid (against Gram positive organisms) and anti-Candida cell wall activities. The investigators have found that lactoferrin not only inhibits growth; it impairs virulence of some of the major pathogens by decreasing their ability to adhere or to invade mammalian cells, and by binding to, or degrading, specific virulence proteins. Lactoferrin may protect infants from sepsis by blocking attachment and invasion of organisms in the gut.

Specific aim 2: The investigators will test the hypothesis that bovine lactoferrin supplementation promotes better neurodevelopment and growth outcomes in preterm infants assessed by the Mullen Scales of Early Learning, a standardized neurologic exam and growth measurements at 12, 18 and 24 months corrected age.