Abstract
Lipids including cholesterol (CHO) and fatty acids (FAs) are main constituents of human body cells and actors in physiological functions thus representing a critical requirement for the embryonic and fetal development.
CHO and FAs attain multiples functions: CHO is a cellular membrane constituent, a steroid hormone, bile acids and oxysterol precursor and it is essential for activation of various signalling pathway (Fielding and Fielding, Biochem Soc Trans 32:65–69, 2004; Cooper et al., Nat Genet 33:508–513, 2003). CHO plays an important role before implantation, as a precursor of progesterone synthesis, and helps in maintaining the early pregnancy (Baardman et al., Biol Reprod 88:1–9, 2013; Murphy, J Reprod Fertil Suppl 55:23–28, 2000; Woollett, Am J Clin Nutr 82:1155–1161, 2005; Herrera et al., Horm Res 65:59–64, 2006; Weissgerber and Wolfe, Appl Physiol Nutr Metab 31:1–11, 2006). When the embryo is implanted in the uterine wall, CHO is determinant for the embryogenesis and morphogenesis and patterning of the central nervous system (Bertrand and Dahmane, Trends Cell Biol 16:597–605, 2006). As well FAs and triglycerides (TGs) are cellular membrane constituents, represent an energy source and take part in neuronal and visual development (Innis, Brain Res 1237:35–43, 2008).
The embrio and fetus do not come in direct contact with the maternal circulation thus are dependent upon tissues surrounding them to receive the nutritional support. These tissues are represented by the yolk sac and trophoblasts, early in the first trimester, then the placenta since the end of the first trimester and the second trimester (Woollett, Am J Clin Nutr 82:1155–1161, 2005). The placenta is an hemochorial villous organ with multiple functions: oxygen and CO2 exchange, nutrient absorbption and immune barrier. It represents a bridge connecting mother and fetus through the maternal-placental (uteroplacental) blood circulation and the fetal-placental (fetoplacental) blood circulation. The functional unit of the placenta is the chorionic villus which contains syncytiotrophoblast/cytotrophoblast, villous stroma and fetal vascular endothelium, layers that separate the maternal blood from the fetal circulation (Wang and Zhao, Vascular biology of the placenta. Morgan & Claypool Life Sciences, San Rafael, 2010). The yolk sac and the placenta provide an adequate nutrient supply by transporting a wide variety of maternal molecules to the embrio and fetus, including lipids, so promoting the intrauterine development. The transfer of some nutrients is regulated by the placenta itself through specific enzymes, receptors and transport proteins; others nutrients are directly metabolized by the placenta.
During gestation metabolic changes intervene with a shift from carbohydrates to lipids for maternal energy production in order to make nutrients available for the fetus (Di Cianni et al., Diabetes Metab Res Rev 19(4):259–70, 2003). Glucose is the main substrate that crosses the placenta but other factors may also contribute to the fetal growth. The fetus requires a substantial amount of lipids throughout its development, the lack of CHO affecting growth disorders (Tint et al., J Pediatr. 127:82–87, 1995). To satisfy these needs maternal physiological hyperlipidemia is manifest in pregnancy; CHO, TGs and FAs concentrations increase in both maternal plasma and erythrocytes thus allowing the fetus to rapidly receive and store fat, which exceeds by far that of any other nutrient (Gil-Sánchez et al., Curr Opin Clin Nutr Metab Care 15:265–272, 2012). Maternal plasma CHO may increase through the 12th week of gestation while TGs reach the 150–300 % of increase in the third trimester of pregnancy (Herrera et al., Horm Res 65:59–64, 2006; Martin et al., Clin Sci 96:421–425, 1999; Amundsen et al., Atherosclerosis 189:451–457, 2006). The two lipoproteins (LPs) classes involved in supporting the placental CHO need are low density lipoprotein (LDL) and high density lipoprotein (HDL) (Tuckey, Placenta 26:273–281, 2005; Henson et al., Endocrinology 137:2067–2074, 1996; Knopp et al., Biol Neonate 50:297–317, 1986). A supply of CHO requirement as a precursor for the production of steroid hormones in the placenta is further critical (Saarelainen et al., Circ J 70:768–777, 2006). Fetal steroid precursors of estrogens regulate the uptake of maternal LPs to promote the placental progesterone synthesis. Both estrogen and progesterone are thus key determinants in pregnancy maintenance and fetal growth so being evident the basic role of fetal and maternal LPs (Pepe and Albrecht, Endocr Rev 16:608–649, 1995; Desoye et al., J Clin Endocrinol Metab 64:704–712, 1987) (Fig. 12.1).
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Abbreviations
- ABCA1:
-
ATP-binding cassette A1
- ABCG1:
-
ATP-binding cassette G1
- ApoA-1:
-
Apoprotein A-1
- ApoA-4:
-
Apoprotein A-4
- ApoE:
-
Apoprotein E
- CE:
-
Cholesteryl ester
- CETP:
-
Colesteryl ester transfer protein
- CHO:
-
Cholesterol
- HDL:
-
High density lipoprotein
- FA:
-
Fatty acid
- FFA:
-
Free fatty acid
- LCAT:
-
Lecithin:cholesterol acyl transferase
- LDL:
-
Low density lipoprotein
- LP:
-
Lipoprotein
- LRP-1:
-
LDL-receptor related protein 1
- LRP-2:
-
LDL-receptor related protein 2
- NPC1L1:
-
Niemann-Pick C1-like1
- PTP:
-
Phospholipid transfer protein
- SPC-X/2:
-
Sterol carrier protein X and 2
- SR-B1:
-
Scavenger receptor class B
- TG:
-
Triglyceride
- VLDL:
-
Very low density lipoprotein
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Guardamagna, O., Cagliero, P. (2016). Lipid Metabolism in the Human Fetus Development. In: Bhattacharya, N., Stubblefield, P. (eds) Human Fetal Growth and Development. Springer, Cham. https://doi.org/10.1007/978-3-319-14874-8_12
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