title: Isolation of luteinizing hormone receptor binding inhibitor from ovine corpora lutea.
abstract: Procedures for the isolation of luteinizing hormone receptor binding inhibitor (LHRBI) from crude extracts of ovine corpora lutea are described. Microsomal pellets recovered by differential centrifugation of homogenates of fresh corpora lutea were stored at -20 degrees C for 3 weeks and then extracted with Tris-HCl buffer (pH 7.4). On sequential filtration of the extract on Amicon UM-20, PM-10 and UM-2R filters, the corresponding retentates (UM-20R, PM-10R and UM-2R) demonstrated inhibition of radio-labeled human chorionic gonadotrophin (hCG) to ovine luteal cells. The retentate of UM-2 filter (UM-2R) was further fractionated by reverse phase high pressure liquid chromatography. The active fractions- III, IX, X and XIII, thus obtained, calculated by their ability to inhibit 125I-hCG binding in dose dependent manner, were purified 150 to 1000-fold.
authors.affiliation: Department of Reproductive Biomedicine, National Institute of Health and Family Welfare, Munirka, New Delhi 110067.
authors.forename: N
authors.initials: N
authors.lastname: Kumar
authors.forename: G L
authors.initials: GL
authors.lastname: Kumari
authors.forename: R N
authors.initials: RN
authors.lastname: Dhir
authors.forename: S
authors.initials: S
authors.lastname: Duraiswami
mesh_terms: D000818:Animals; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003338:Corpus Luteum / Q000032:analysis* / Q000166:cytology; D003902:Detergents; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism; D005615:Freezing; D066298:In Vitro Techniques; D036341:Intercellular Signaling Peptides and Proteins; D007986:Luteinizing Hormone / Q000378:metabolism; D008861:Microsomes / Q000032:analysis; D017830:Octoxynol; D010455:Peptides / Q000302:isolation & purification*; D011092:Polyethylene Glycols; D011388:Prolactin / Q000378:metabolism; D011863:Radioimmunoassay; D011974:Receptors, LH / Q000378:metabolism*; D012756:Sheep; D014462:Ultrafiltration
chemical_list: D003902:Detergents; D036341:Intercellular Signaling Peptides and Proteins; C011898:LH receptor binding inhibitor; D010455:Peptides; D011974:Receptors, LH; D011092:Polyethylene Glycols; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D017830:Octoxynol