title: Human chorionic gonadotropin (hCG) as inhibitior of E-selectin-mediated cell adhesion.
abstract: OBJECTIVE
  Human chorionic gonadotropin (hCG) is a placental glycoprotein hormone of clinical importance. It is secreted into maternal circulation, amniotic fluid, urine and is also found in the serum and urine of patients with malignant trophoblastic diseases. Depending on the source, we detected a remarkable expression of sialyl Lewisx on this protein. Sialyl Lewis' is known as a minimal ligand recognized by selectins, which are involved in cell adhesion processes in inflammatory and metastatic diseases. In this context, the purpose of the study was to explore the ability of hCG to serve as a selectin antagonist.
  
  
  METHODS
  We purified hCG from human amniotic fluid, serum and urine of pregnant women and from supernatants of the trophoblastic tumour cell lines Jeg3 and BeWo by immunoadsorption chromatography. The proteins were functionally tested for a specific blockade of the E-selectin-mediated cell adhesion in vitro. The efficiencies of hCG from different origins were compared.
  
  
  RESULTS
  We found that hCG isolated from serum, amniotic fluid and supernatant of the cell line Jeg3 were strong inhibitors with at least 10(3)-fold higher potency compared to the monovalent tetrasaccharide sialyl Lewisx. As expected from the carbohydrate expression, hCG isolated from the urine of pregnant women, but even from the supernatant of BeWo cells, showed no inhibitory effect.
  
  
  CONCLUSIONS
  hCG is an effective selectin antagonist. This fact suggests that hCG may play a role in preventing leukocyte adhesion on the foetal syncytiotrophoblast or the metastatic activity of trophoblastic tumour cells.
authors: Glyootope GmbH, Berlin, Germany.
authors: Renate
authors: R
authors: Stahn
authors: Steffen
authors: S
authors: Goletz
authors: Rainer
authors: R
authors: Stahn
authors: Robert
authors: R
authors: Wilmanowski
authors: Xiaoyu
authors: X
authors: Wang
authors: Volker
authors: V
authors: Briese
authors: Klaus
authors: K
authors: Friese
authors: Udo
authors: U
authors: Jeschke
mesh_terms: D002448:Cell Adhesion / Q000502:physiology*; D006063:Chorionic Gonadotropin / Q000502:physiology*; D002853:Chromatography, Liquid; D019040:E-Selectin / Q000502:physiology*; D005260:Female; D006801:Humans; D011247:Pregnancy
chemical_list: D006063:Chorionic Gonadotropin; D019040:E-Selectin