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Fertil Steril. 2011 Aug;96(2):422-427.e2. doi: 10.1016/j.fertnstert.2011.05.049. Epub 2011 Jun 15.

Identification of apolipoprotein A1 in the human embryonic secretome.

Author information

1
Department of Obstetrics & Gynecology, University of Iowa Hospitals & Clinics, Iowa City, Iowa, USA.

Abstract

OBJECTIVE:

To identify factors secreted by the human embryo and correlate levels with embryo morphology and pregnancy outcome.

DESIGN:

A laboratory-based study of human embryo protein synthesis and secretion and a retrospective analysis of spent embryo culture media as it relates to pregnancy outcome.

SETTING:

University-based academic IVF program.

PATIENT(S):

IVF patients who had donated cryopreserved human pronuclear-stage embryos. Patients undergoing fresh IVF cycles resulting in a blastocyst transfer who donated spent media drops.

INTERVENTION(S):

In vitro embryo culture and collection of spent media.

MAIN OUTCOME MEASURE(S):

Protein analysis and identification by two-dimensional gel electrophoresis and mass spectrometry, ApoA1 quantification by ELISA, and mRNA analysis by quantitative reverse transcriptase-polymerase chain reaction.

RESULT(S):

By protein gel electrophoresis, apolipoprotein A1 (ApoA1) was increased in the culture media from good-quality blastocysts (n = 6 embryos) compared to either cleavage-arrested embryos (n = 6 embryos) or poor-quality blastocysts (n = 6 embryos) using spent media from culture days 4 and 5, respectively. Apolipoprotein A1 concentrations were 23.1% greater in day 5 spent culture media from good-grade blastocysts (n = 30) when compared to poor-grade embryos (n = 30). However, in a group of patients (n = 20) with transfer of two good-quality blastocysts, ApoA1 levels from day 5 spent media did not correlate with embryo implantation and pregnancy. Quantitative reverse transcriptase-polymerase chain reaction confirmed the presence of ApoA1 mRNA transcripts in human blastocysts.

CONCLUSION(S):

Apolipoprotein A1 is produced by human preimplantation embryos, and increased levels are present in spent culture media containing blastocysts of higher morphologic grade. These results suggest a role for lipoproteins in early embryologic development.

[Indexed for MEDLINE]

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