title: Decrease in IGF-I binding sites on human promyelocytic leukemia cell line (HL-60) with differentiation.
abstract: Specific insulin-like growth factor I (IGF-I) receptors on human promyelocytic leukemia cell line (HL-60) were identified and characterized. [125I]IGF-I specifically bound to the cells, and [125I]IGF-I binding to the cells was displaced by unlabeled IGF-I in a dose dependent manner. [125I]IGF-I binding to the cells were displaced by multiplication stimulating activity (MSA) and porcine insulin, with potencies that were 10 and 100 times less than that of IGF-I, respectively. By an affinity labeling technique, IGF type I receptors were found to be present on the HL-60 cells. After the cells were differentiated to the macrophage-like cells by 12-o-tetra-decanoyl-phorbol-13-acetate (TPA) and 1,25-dihydroxy-vitamin D3 (1,25(OH)2D3), [125I]IGF-I binding to the cells decreased significantly. By Scatchard analysis, it was found to be due to a decrease in the number of IGF-I receptors. Thus, the differentiation of HL-60 cells to the macrophage-like cells was accompanied by a decrease in IGF-I receptors.
mesh_terms: D000345:Affinity Labels; D002454:Cell Differentiation; D002460:Cell Line; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D015470:Leukemia, Myeloid, Acute / Q000378:metabolism* / Q000473:pathology; D008264:Macrophages / Q000473:pathology; D011972:Receptor, Insulin / Q000032:analysis* / Q000187:drug effects; D017451:Receptors, Somatomedin; D013002:Somatomedins / Q000378:metabolism*
chemical_list: D000345:Affinity Labels; D017451:Receptors, Somatomedin; D013002:Somatomedins; D007334:Insulin-Like Growth Factor I; D011972:Receptor, Insulin