title: Embryonic adhesion is not affected by endometrial leptin receptor gene silencing.
abstract: OBJECTIVE
  In rodents, evidence suggests that the leptin system is mandatory for embryonic implantation. We aimed to investigate the functional relevance of the endometrial leptin receptor (OB-R) in the adhesion phase of human implantation.
  
  
  METHODS
  We used an in vitro model for embryonic adhesion, composed of a human endometrial cell line (HEC1-A) and B6C3F1 mouse embryos. The OB-R gene was silenced in a stable manner by RNA interference, and embryonic adhesion rates were analyzed.
  
  
  METHODS
  Research laboratory at a university-affiliated center.
  
  
  METHODS
  RNA interference.
  
  
  METHODS
  Embryonic adhesion in cells treated with OB-R RNAi.
  
  
  RESULTS
  The OB-R shRNA-transfected cells exhibited up to 80% lower OB-R mRNA levels than those of cells nontransfected or transfected with scrambled shRNA. The OB-R protein was also highly diminished in the stable OB-R shRNA-transfected HEC1A cells, whereas OAS1 expression was similar in both nontransfected and transfected cells. Embryonic adhesion rate was similar in nontransfected (94%) and HEC1-A transfected cells with a scrambled sequence (94%) or with OB-R silencing sequence (92%).
  
  
  CONCLUSIONS
  Knocking down the OB-R gene in a human endometrial cell line has no effect on the embryonic adhesion rate. Nevertheless, the functional relevance of this system can not be excluded in other phases of embryonic implantation, such as the invasion phase. Moreover, we describe a new approach to the functional analysis of candidate molecules implicated in blastocyst adhesion.
authors.affiliation: Fundación IVI, Instituto Universitario IVI, Universidad de Valencia, Valencia, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Cervero
authors.forename: Francisco
authors.initials: F
authors.lastname: Domínguez
authors.forename: Jose Antonio
authors.initials: JA
authors.lastname: Horcajadas
authors.forename: Alicia
authors.initials: A
authors.lastname: Quiñonero
authors.forename: Antonio
authors.initials: A
authors.lastname: Pellicer
authors.forename: Carlos
authors.initials: C
authors.lastname: Simón
mesh_terms: D000818:Animals; D002448:Cell Adhesion / Q000235:genetics; D002460:Cell Line; D002478:Cells, Cultured; D010064:Embryo Implantation / Q000235:genetics; D004622:Embryo, Mammalian / Q000166:cytology / Q000502:physiology*; D004717:Endometrium / Q000166:cytology / Q000196:embryology* / Q000378:metabolism*; D005260:Female; D020868:Gene Silencing / Q000502:physiology*; D006801:Humans; D051379:Mice; D011247:Pregnancy; D011956:Receptors, Cell Surface / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000235:genetics*; D054411:Receptors, Leptin
chemical_list: C515448:LEPR protein, human; D011956:Receptors, Cell Surface; D054411:Receptors, Leptin; C515447:leptin receptor, mouse