The effects of a lipid-based nutrient supplement and antiretroviral therapy in a randomized controlled trial on iron, copper, and zinc in milk from HIV-infected Malawian mothers and associations with maternal and infant biomarkers

Abstract

We evaluated effects of antiretroviral (ARV) therapy and lipid-based nutrient supplements (LNSs) on iron, copper, and zinc in milk of exclusively breastfeeding HIV-infected Malawian mothers and their correlations with maternal and infant biomarkers. Human milk and blood at 2, 6, and 24weeks post-partum and blood during pregnancy (30weeks gestation) were collected from 535 mothers/infant-pairs in the Breastfeeding, Antiretrovirals, and Nutrition study. The participants received ARV, LNS, ARV and LNS, or no intervention from 0 to 28weeks post-partum. ARVs negatively affected copper and zinc milk concentrations, but only at 2weeks, whereas LNS had no effect. Among all treatment groups, approximately 80-90% of copper and zinc and <50% of iron concentrations met the current adequate intake for infants at 2weeks and only 1-19% at 24weeks. Pregnancy haemoglobin was negatively correlated with milk iron at 2 and 6weeks (r=-.18, p<.02 for both). The associations of the milk minerals with each other were the strongest correlations observed (r=.11-.47, p<.05 for all); none were found with infant biomarkers. At 2weeks, moderately anaemic women produced milk higher in iron when ferritin was higher or TfR lower. At 6weeks, higher maternal -1-acid glycoprotein and C-reactive protein were associated with higher milk minerals in mildly anaemic women. Infant TfR was lower when milk mineral concentrations were higher at 6weeks and when mothers were moderately anaemic during pregnancy. ARV affects copper and zinc milk concentrations in early lactation, and maternal haemoglobin during pregnancy and lactation could influence the association between milk minerals and maternal and infant iron status and biomarkers of inflammation.