Abstract
ABSTRACT: Apolipoprotein A-1 (Apo A-1) is the major protein constituent of high-density lipoprotein (HDL) and Apo A-1 plays an important role in lipid metabolism and may be protective against atherosclerosis in adults. However, little is known about HDL and Apo A-1 in the developing human fetus. Herein we investigated the relationship of Apo A-1 levels in umbilical cord blood at delivery to gestational age and HDL cholesterol. Fetal plasma levels of Apo A-1, which were not correlated with those in maternal plasma, were significantly lower among newborns delivered at 21–26 wk gestation (52 ± 4.4 mg/dl, mean ± SE) than in those delivered at 33–34 wk gestation (87 ± 5.8 mg/dl). Thereafter, the mean umbilical cord plasma levels of Apo A-1 remained relatively constant (101 mg/dl at 39–40 wk of gestation). We found no significant correlations between Apo A-1 levels and fetal sex, race, or delivery method. At equivalent gestational ages and birth weights, however, Apo A-1 levels in white newborns tended to be lower than those in black infants. The Apo A-1/HDL cholesterol ratio in umbilical cord blood rose progressively from 2.5 (27–28 wk gestation) to 3.8 at term, due largely to increased Apo A-l levels but little change in the mean HDL cholesterol levels, which ranged from 22–24 mg/dl at each gestational period. These results are suggestive that fetal plasma Apo A-1 is derived solely from fetal sources and that the rate of production and/or clearance of Apo A-1 is altered during the latter third of human intrauterine development.
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Richard Parker, C., Fortunato, S., Carr, B. et al. Apolipoprotein A-1 in Umbilical Cord Blood of Newborn Infants: Relation to Gestational Age and High-Density Lipoprotein Cholesterol. Pediatr Res 23, 348–351 (1988). https://doi.org/10.1203/00006450-198804000-00002
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DOI: https://doi.org/10.1203/00006450-198804000-00002
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