2 Maternal-Fetal Transfer of Vitamin A …
49
have been associated with increased birth weight in both hyperglycemic (Kushtagi
and Arvapally 2009; Whyte et al. 2013) and euglycemic women (Sommer et al. 2015;
Vrijkotte et al. 2011). Given the critical role of lipids during embryonic development
and the current trend of recommending supplementation with vitamins, including
β-carotene, during pregnancy, we feel that it is important to understand whether
the maternal intake of β-carotene, by influencing the placental-fetal transport of
dietary fatty acids, is beneficial or detrimental to the short- and long-term wellbeing of the fetus. This is a previously unforeseen cross-talk between micro- and
macro-nutrient metabolism during pregnancy, whereby the maternal diet can have
potentially critical effects on fetal health. In this vein, it is necessary to further
understand the molecular details of the β-apocarotenoid-mediated modulation of
placental lipoprotein secretion. For example, direct targets of β-apocarotenoids in
placenta, as well as in other tissues, still remain to be identified. Also, it remains to be
established which β-apocarotenoid form (alcohol, acid, aldehyde) is transcriptionally
active in the above-mentioned process. Further investigations may also be warranted
to confirm the existence of the above-described feed-forward regulation of placental
lipoprotein assembly and secretion under a maternal regimen of high VA intake, as
well as to determine whether the regulation of MTP function by dietary cues (i.e.,
β-apocarotenoids) may take place in other maternal or embryonic organs.
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