title: Renin substrate in human amniotic fluid.
abstract: Purified human amniotic fluid renin substrate (RS) was compared to purified plasma RS. RS in plasma and amniotic fluid were similar in molecular weight, isoelectric point and immunological properties. Immunoreactivity of radio-iodinated amniotic fluid RS was lower than that of plasma RS. Measured by direct radioimmunoassay, RS-levels were only 10-22% of those obtained with indirect assay in 22 amniotic fluid samples. This difference suggests that amniotic fluid RS is less immunoreactive than plasma RS, possibly due to biochemical alteration or complex formation. No such difference in immunoreactivity was noticed in RS of decidual and placental cytosolic fraction.
authors.affiliation: Minerva Institute for Medical Research, Helsinki University Central Hospital, Finland.
authors.forename: K
authors.initials: K
authors.lastname: Metsärinne
authors.forename: F
authors.initials: F
authors.lastname: Fyhrquist
authors.forename: K
authors.initials: K
authors.lastname: Rosenlöf
authors.forename: M
authors.initials: M
authors.lastname: Autero
authors.forename: F
authors.initials: F
authors.lastname: Pekonen
authors.forename: E M
authors.initials: EM
authors.lastname: Rutanen
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D000808:Angiotensinogen / Q000032:analysis* / Q000097:blood / Q000302:isolation & purification; D015153:Blotting, Western; D002850:Chromatography, Gel; D003600:Cytosol / Q000032:analysis; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D007525:Isoelectric Focusing; D010920:Placenta / Q000032:analysis; D011247:Pregnancy
chemical_list: D000808:Angiotensinogen