Identification of a Receptor for Somatomedin-Like Polypeptides in Human Fibroblasts*

作者：Matthew M. Rechler, S. Peter Nissley, Judith M. Podskalny, Alan Charles Moses, Linda Fryklund · 发表于：The Journal of Clinical Endocrinology & Metabolism · 年份：1977 · DOI：10.1210/jcem-44-5-820 · 被引用次数：107 · 研究领域：Biochemical and Molecular Research、Monoclonal and Polyclonal Antibodies Research、Peptidase Inhibition and Analysis

We have demonstrated a specific receptor for somatomedin-like growth polypeptides in human fibroblasts in culture using the closely related polypeptide, multiplication stimulating activity (MSA), as the radioligand. Polypeptides purified from human plasma, somatomedin A and acid soluble nonsuppressible insulin-like activity (NSILA-s), competed potently for 125I-MSA binding, as did unlabeled MSA. Although insulin and proinsulin also strongly inhibited MSA binding, the properties of the growth peptide receptor differed from those of the human fibroblasts insulin receptor. Somatomedin A, NSILA-s, MSA, insulin and proinsulin all stimulated the incorporation of [3H]thymidine into DNA in human fibroblasts. We propose that these polypeptides induce DNA synthesis through their interaction with the growth peptide receptor.