Human milk lactoferrin variation in relation to maternal inflammation and iron deficiency in northern Kenya

BACKGROUND: Milk lactoferrin is a multi‐functional, iron‐binding glycoprotein with immunomodulatory effects, protecting infants against infectious diseases. AIMS: This study explored how maternal inflammation/infection and iron‐deficiency anemia (IDA) might influence human milk lactoferrin. Lactoferrin might be elevated with maternal inflammation resulting from infectious disease processes. Conversely, lactoferrin might decrease with IDA, corresponding to scarce maternal iron for transfer in milk. In these two hypothesized scenarios, the degree of lactoferrin elevation or decrease might vary with infant vulnerability to infectious diseases or malnutrition. Alternatively, lactoferrin might be unassociated with inflammation/infection or IDA if mothers could buffer it against these conditions. MATERIALS & METHODS: We used cross‐sectional data from Ariaal mothers of northern Kenya (n = 200) to evaluate associations between milk lactoferrin and maternal inflammation/infection, IDA, infant age/sex, and the mother‐infant variable interactions in multivariate regression models. RESULTS: Maternal inflammation was associated with higher lactoferrin for younger infants (<~5 months of age) but with lower lactoferrin for older infants. Maternal IDA was unassociated with lactoferrin alone or in interaction with infant variables. DISCUSSION & CONCLUSION: Results suggest that mothers of vulnerable young infants deliver more lactoferrin when they have inflammation/infection but mothers with older infants do not, and that maternal delivery of lactoferrin is unaffected by their IDA. Longitudinal research should verify these findings.