title: [Type-I and -II estradiol binding sites in the endometrium during blastocyst implantation].
abstract: The properties of type I and occupied and unoccupied type II cytosolic estrogen binding sites in the rat endometrium were analyzed on day five of pregnancy; the samples studied correspond to blastocyst receptive endometrium (implantation sites), nonreceptive endometrium and ovariectomized uterine horn endometrium, from the same pregnancy rats. The occupied binding site type II was analyzed by exchange assays. Dissociation constant obtained from experiments carried out at 4 or 25 degrees C are similar for each one of the binding site at the three different endometrium samples; the binding capacity (femtomoles/mg protein) from the sites type I and type II and the ratio between occupied (by endogenous estradiol) and unoccupied site type II, seems to be characteristic for each one of the three analyzed endometrium.
authors.forename: A
authors.initials: A
authors.lastname: Bernal
authors.forename: L
authors.initials: L
authors.lastname: Calzada
authors.forename: J J
authors.initials: JJ
authors.lastname: Hicks
authors.forename: A
authors.initials: A
authors.lastname: Velázquez
mesh_terms: D000818:Animals; D001665:Binding Sites / Q000502:physiology; D003600:Cytosol / Q000737:chemistry / Q000378:metabolism; D010064:Embryo Implantation / Q000502:physiology*; D004717:Endometrium / Q000737:chemistry / Q000378:metabolism*; D005260:Female; D011247:Pregnancy; D011869:Radioligand Assay / Q000379:methods; D051381:Rats; D011959:Receptors, Estradiol / Q000032:analysis / Q000378:metabolism*
chemical_list: D011959:Receptors, Estradiol
vernacular_title: Sitios de unión tipo I y II a estradiol en endometrio durante la implantación del blastocisto.