Apolipoprotein A-1 in umbilical cord blood of newborn infants: relation to gestational age and high-density lipoprotein cholesterol.
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-1 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.
D016632:Apolipoprotein A-I; D001054:Apolipoproteins A / Q000097:blood*; D008076:Cholesterol, HDL / Q000097:blood; D036861:Delivery, Obstetric; D005007:Ethnology; D005260:Female; D005312:Fetal Blood / Q000032:analysis; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn / Q000097:blood*; D008075:Lipoproteins, HDL / Q000097:blood*; D008297:Male; D012727:Sex Characteristics
D016632:Apolipoprotein A-I; D001054:Apolipoproteins A; D008076:Cholesterol, HDL; D008075:Lipoproteins, HDL