title: [A study on the immunoreactive luteinizing hormone-releasing hormone in villi by radioimmunoassay in the first trimester (author's transl)].
abstract: We extracted the immunoreactive luteinizing hormone-releasing hormone (IR-LHRH) from villous and plasma in the first trimester of pregnancy with 0.2N acetic acid and the florisil absorbtion method. Recovery rate was 40.0 +/- 4.08% in the former and 62.5 +/- 9.5% in the latter, respectively. These IR-LHRH were measured by radioimmunoassay, which showed sensitivity from 5 to 500 pg/ml. The villous IR-LHRH was compared with synthetic LH-RH by a dilution curve in different concentrations and the column gel filtration of sephadex-G25. The dilution curve of synthetic LH-RH and sample material showed a significant correlation, and the elution time of villous IR-LHRH on the column was something faster than that of synthetic LH-RH. The concentration of villous IR-LHRH showed 20--100 pg/0.1g dry weight in the first trimester of pregnancy, and the peak was at 9 weeks of normal pregnancy and at 8 weeks of inevitable abortion respectively, but these IR-LHRH levels were not changed between pre- and post-dilation and curettage. From this evidence, we considered that IR-LHRH show activity of the local hormone in villous tissue similar to somatostation.
mesh_terms: D002824:Chorionic Villi / Q000032:analysis*; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000032:analysis* / Q000097:blood / Q000276:immunology; D006801:Humans; D010920:Placenta / Q000032:analysis*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011863:Radioimmunoassay
chemical_list: D007987:Gonadotropin-Releasing Hormone