Document Detail

Glycosylation changes in human chorionic gonadotropin and free alpha subunit as gestation progresses.
MedLine Citation:
PMID:  1377707     Owner:  NLM     Status:  MEDLINE    
Carbohydrate is important to the structure, function, and circulatory survival of the glycoprotein hormones. Human CG (hCG) and the related free alpha-molecule of pregnancy contain four and two asparagine-linked oligosaccharides, respectively. The present study analyzes changes in the glycosylation patterns of hCG and free alpha in early vs. late gestation. Five volunteers provided 24-h urine samples, weekly, throughout their pregnancies. Extracts of early pregnancy (weeks 7-12) and late pregnancy (weeks 28-32) urines were pooled. Early and late samples from each patient were subjected to gel filtration to separate hCG and free alpha, and the populations thus obtained were analyzed by lectin affinity chromatography on Concanavalin A-Sepharose (Con A) and Lens culinaris-agarose (Lch). Using Con A, free alpha and hCG were separated into an unbound fraction (eluted with Con A buffer), a weakly bound fraction (eluted with 10 mmol alpha-methyl-D-glucoside) and a tightly bound fraction (eluted with 500 mmol alpha-methyl-D-mannoside). For free alpha-molecule, a significant decrease in tightly bound Con A forms, was noted from early to late pregnancy with a mean difference of 17.0 +/- 2.4% (P less than 0.01). Concomitantly, in late pregnancy, an increase in Con A unbound forms of free alpha was noted with mean difference of 12.5 +/- 1.7% (P less than 0.01). These changes indicate the presence of more highly branched oligosaccharides on free alpha as gestation advances. No changes were noted in the Con A binding of intact hCG; nearly all hCG bound in both early and late pregnancy. Using Lch, free alpha and hCG were separated into an unbound fraction (eluted with Lch buffer) and a bound fraction (eluted with 500 mmol alpha-methyl-D-mannose). Both free alpha and intact hCG in late pregnancy exhibited increased binding to Lch, with mean differences from early to late pregnancy of 30.2 +/- 4.8% (P less than 0.01) and 11.4 +/- 4.5% (P less than 0.05), respectively. These data indicate increased incorporation of fucose into the carbohydrate moieties in late pregnancy. Taken together, these data derived by analysis using lectin specificity imply the presence of more highly branched, fucosylated oligosaccharides as gestation progresses.
M C Skarulis; R E Wehmann; B C Nisula; D L Blithe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of clinical endocrinology and metabolism     Volume:  75     ISSN:  0021-972X     ISO Abbreviation:  J. Clin. Endocrinol. Metab.     Publication Date:  1992 Jul 
Date Detail:
Created Date:  1992-07-31     Completed Date:  1992-07-31     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0375362     Medline TA:  J Clin Endocrinol Metab     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  91-6     Citation Subset:  AIM; IM    
Developmental Endocrinology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
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MeSH Terms
Chorionic Gonadotropin / metabolism,  urine*
Chromatography, Affinity
Concanavalin A
Gestational Age
Glycoprotein Hormones, alpha Subunit / metabolism,  urine*
Pregnancy / urine*
Pregnancy Trimester, First
Pregnancy Trimester, Third
Reg. No./Substance:
0/Chorionic Gonadotropin; 0/Glycoprotein Hormones, alpha Subunit; 0/Lectins; 11028-71-0/Concanavalin A; 9004-54-0/Dextrans; 9012-36-6/Sepharose; 9014-76-0/sephadex

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