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Related Experiment Videos

Apolipoproteins in human amniotic fluid: concentrations, isoforms and polymorphism.

A Steinmetz1, M Sefraoui, E Scheffler

  • 1Zentrum Innere Medizin, Institut Pasteur de Lille, France.

Gynecologic and Obstetric Investigation
|January 1, 1989
PubMed
Summary

Human amniotic fluid contains key apolipoproteins, with levels generally at 1% of adult plasma. Apolipoprotein B is notably lower, and levels change during pregnancy, influenced by genetic factors.

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Area of Science:

  • Biochemistry
  • Maternal-fetal medicine
  • Lipid metabolism

Background:

  • Apolipoproteins are crucial for lipid transport in plasma.
  • Understanding apolipoprotein presence in amniotic fluid provides insights into fetal development and maternal-fetal exchange.

Purpose of the Study:

  • To quantify major apolipoproteins in human amniotic fluid.
  • To investigate changes in apolipoprotein levels during gestation.
  • To explore the relationship between apolipoprotein A-IV genetic variants and other apolipoprotein levels.

Main Methods:

  • Amniotic fluid samples collected via amniocentesis from 50 pregnant individuals.
  • Quantification of apolipoproteins (A-I, A-II, A-IV, B, E, C-III) using immunoassays.
  • Isofocusing to analyze apolipoprotein identity and genetic polymorphism.

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Main Results:

  • Apolipoproteins A-I, A-II, A-IV, and E were detected at approximately 1% of adult plasma levels.
  • Apolipoprotein B was significantly lower (0.04% of plasma), and apo C-III was below detection limits.
  • Apolipoprotein B levels decreased, while apo A-I levels increased in late pregnancy.
  • Genetic variants of apolipoprotein A-IV correlated with altered levels of apo A-I and A-II.

Conclusions:

  • Human amniotic fluid contains major plasma apolipoproteins, with apo B being a notable exception due to its low concentration.
  • Apolipoprotein levels in amniotic fluid exhibit dynamic changes during gestation and are influenced by genetic factors.
  • These findings contribute to understanding lipoprotein metabolism in the fetal environment.