BACKGROUND The 1st WHO International Reference Reagents (IRRs) for 6 human chorionic gonadotropin (hCG)-related molecular variants, highly purified and calibrated in substance concentrations by the IFCC Working Group for hCG, permit experimental elucidation of what commercially available hCG methods measure in molar terms and enable assessment of their fitness for clinical purposes. METHODS P...

BACKGROUND During pregnancy, when human chorionic gonadotropin (hCG) concentrations are highest, there is a transient suppression of serum thyrotropin (TSH). In normal pregnancy, TSH concentrations generally remain within nonpregnant reference intervals; however, in some patients TSH is suppressed. Here we sought to extend previous studies to examine the relationship between very high serum con...

Immunological methods are being used to determine human chorionic gonadotropin (HCG) in urine and serum during pregnancy (1-4) and also to localize it in tissues and tumors (5). The antisera used in these studies (1-5) were produced by immunizing rabbits with HCG preparations of widely varying specific activities. The HCG-HCG antisera characterization studies that were performed primarily with ...

A novel amperometric immunosensor for determination of human serum chorionic gonadotrophin (HCG) was constructed by immobilization of HCG with titania sol-gel on a glassy carbon electrode and the direct electrochemistry of horseradish peroxidase (HRP) labeled to HCG antibody (HRP-anti-HCG). The morphologies of the HCG membrane were characterized to be chemically clean, porous and homogeneous. H...

Angiogenesis and vascular remodeling are crucial processes in tumor invasion and metastasis as well as in embryo implantation and normal development of the placenta. We have previously shown that hCG expressed in trophoblast and various malignant tumors promotes cellular motility and that uterine endothelium expresses hCG/LH receptor in vivo. In this study hCG was proposed to promote angiogenes...

El objetivo del trabajo fue determinar el contenido de energía metabolizable y digestibilidad íleal aparente aminoácidos en harina calmar gigante (Dosidicus gigas) (HCG) como fuente proteína dieta para pollo engorda. Experimento 1: 96 pollos (1 a 21 días edad, iniciación, crecimiento finalización), alimentados con dietas testigo, 8 16% (HCG), analizando composición química, perfil HCG, variable...

Purpose: Trophoblastic cancers (Choriocarcinoma, testicular and ovarian germ cell malignancies) secrete hyperglycosylated hCG and non-trophoblastic cancers secrete hyperglycosylated hCG free βsubunit.Both are structural variants of hCG independent to the hormone hCG. They are autocrines acting on a transforming growth factor β-II (TGF-β-II), receptor not acting on the hormone receptor. Here the...

Using pseudopregnant rat ovaries, the possibility was examined whether hCG-induced early desensitization of the LH/hCG receptor was accompanied by changes in the physical state of membranes. Thirty min after a single s.c. injection of 75 IU hCG, the hCG-responsive adenylylcyclase activity was reduced, whereas hCG binding to ovarian membranes was still normal. Membrane lipid rigidity, as determi...

Human chorionic gonadotropin (hCG), a heterodimeric hormone consisting of an alpha (a) and a beta (β) subunit, is used as a marker for the diagnosis of pregnancy, congenital defects, and choriocarcinoma. After excluding the common causes of elevated serum hCG, laboratory identification of false-positive or true results assists in guiding clinical management. Options include testing urine for hC...