title: Characterization of insulin-like growth factor I receptors on Madin-Darby canine kidney (MDCK) cell line.
abstract: Specific insulin-like growth factor I (IGF-I) receptors on the Madin-Darby canine kidney (MDCK) cell line were identified and characterized. [125I]IGF-I specifically bound to the cells, but [125I]insulin bindings to the cells was minimal. Unlabeled IGF-I displaced both the IGF-I and insulin bindings with potencies that were 100 and 10 times as great as insulin. By an affinity labeling technique, IGF type I receptors were present in the MDCK cells. IGF-I stimulated DNA synthesis and cell proliferation at physiological concentrations. On the other hand, insulin had a little effect on DNA synthesis. These data suggest that IGF type I receptors as demonstrated in MDCK cells are involved in DNA synthesis and cell proliferation.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D002460:Cell Line; D004247:DNA / Q000096:biosynthesis; D004285:Dogs; D007328:Insulin / Q000378:metabolism; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D007668:Kidney / Q000378:metabolism*; D008938:Mitosis; D011972:Receptor, Insulin / Q000302:isolation & purification*; D017451:Receptors, Somatomedin; D013002:Somatomedins / Q000378:metabolism*
chemical_list: D007328:Insulin; D017451:Receptors, Somatomedin; D013002:Somatomedins; D007334:Insulin-Like Growth Factor I; D004247:DNA; D011972:Receptor, Insulin