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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
Published on: December 26, 2011
Hyperglycosylated hCG and pregnancy failures.
1USA hCG Reference Service, Department of Obstetrics and Gynecology, University of New Mexico, Albuquerque, NM 87131, USA. larry@hcglab.com
Journal of Reproductive Immunology
|March 6, 2012
Summary
Low levels of hyperglycosylated human chorionic gonadotropin (hCG) are linked to early pregnancy failures, including spontaneous abortions and biochemical pregnancies. This suggests hyperglycosylated hCG may be a marker for successful implantation and early pregnancy viability.
Area of Science:
- Reproductive Endocrinology
- Biochemistry
- Obstetrics & Gynecology
Background:
- Early pregnancy failures, including spontaneous abortions and biochemical pregnancies, account for significant reproductive loss.
- Chromosomal abnormalities and implantation issues are known contributors to pregnancy failures.
- Hyperglycosylated human chorionic gonadotropin (hCG) is recognized as a crucial signal for successful embryo implantation.
Purpose of the Study:
- To investigate the association between hyperglycosylated hCG levels and early pregnancy outcomes.
- To determine if hyperglycosylated hCG concentrations on the day of implantation can predict pregnancy viability.
Main Methods:
- Urinary hCG levels were measured in 127 pregnancies on the day of implantation.
- Pregnancies were categorized into normal term (81), spontaneous abortion (18), and biochemical (28) groups.
- Concentrations and percentages of hyperglycosylated hCG were compared across the different pregnancy outcome groups.
Main Results:
- Normal term pregnancies exhibited significantly higher mean concentrations and percentages of hyperglycosylated hCG compared to failed pregnancies.
- All normal term pregnancies had >51% hyperglycosylated hCG, while a minority of spontaneous abortion and biochemical pregnancies met this threshold.
- Significantly lower mean hyperglycosylated hCG concentrations and percentages were observed in spontaneous abortion and biochemical pregnancies.
Conclusions:
- Low concentrations of hyperglycosylated hCG on the day of implantation are associated with increased risk of early pregnancy failure.
- Hyperglycosylated hCG may serve as a potential biomarker for predicting pregnancy viability.
- Further research is needed to ascertain whether low hyperglycosylated hCG is a cause or merely a marker of pregnancy failure.
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