title: [Radioreceptor assay for determination of the anti-progestogen, RU-486 and its active metabolites in the blood].
abstract: RU-486 is an antiprogesterone 19-norsteroid with high binding affinity for the progesterone receptor. It can be used with success for termination of early human pregnancy. Since the metabolites of RU-486 are often biologically active, their concentrations in blood can also have clinical significance. We have developed a rapid sensitive radio receptor assay for determination of RU-486 and its active metabolites. Human myometrium progesterone receptor was used as binding protein. The assay is based on the competitive replacement of 3H-ORG-2058 by the active molecular fraction of RU-486 present in the serum. The analytical parameters of this assay are the followings: intraassay percent of coefficient of variation (CV%) is ranged between 7.6 and 10.4%. The interassay CV% was from 7.1 to 16.3. The sensitivity of the receptor assay was 8.7 pmol/tube and the acceptable range was between 10 and 120 pmol/tube. The recovery ranged between 95 and 122% (r = 0.983). These parameters are suitable for the requirement of radioligand binding techniques based on the immunoassays.
authors: I
authors: I
authors: Földesi
authors: G
authors: G
authors: Falkay
authors: L
authors: L
authors: Kovács
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008875:Middle Aged; D015735:Mifepristone / Q000097:blood*; D011869:Radioligand Assay; D011980:Receptors, Progesterone / Q000378:metabolism; D012680:Sensitivity and Specificity
chemical_list: D011980:Receptors, Progesterone; D015735:Mifepristone
vernacular_title: Radioreceptor analitikai módszer az antiprogesztogén RU-486 és aktív metabolitjainak vérböl történö meghatározására.