title: Preparation and binding of radioactively labeled porcine transforming growth factor type beta.
abstract: This report describes the labeling of porcine transforming growth factor type beta (TGF-beta) with 125-iodine. Its binding to NRK cells and three other cell lines has been examined. The data indicate that NRK cells exhibit approximately 10,000 receptors for porcine TGF-beta per cell, with an apparent dissociation constant of 45 pM. The binding of porcine 125I-TGF-beta can be blocked by porcine, murine and human TGF-beta but not by several well characterized growth factors. In all respects examined, the binding observed with porcine 125I-TGF-beta appears to be the same as that observed with human TGF-beta. The findings reported here argue that porcine 125I-TGF-beta can be used to quantitate TGF-beta receptors on a wide range of mammalian cells.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D001792:Blood Platelets / Q000378:metabolism; D002460:Cell Line; D006801:Humans; D007457:Iodine Radioisotopes; D007668:Kidney; D007700:Kinetics; D010455:Peptides / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D011956:Receptors, Cell Surface / Q000378:metabolism*; D018125:Receptors, Transforming Growth Factor beta; D013552:Swine; D015291:Transforming Growth Factors
chemical_list: D007457:Iodine Radioisotopes; D010455:Peptides; D011956:Receptors, Cell Surface; D018125:Receptors, Transforming Growth Factor beta; D015291:Transforming Growth Factors