Autonomous growth of a human neuroblastoma cell line is mediated by insulin-like growth factor II

O. M. El-Badry, J. A. Romanus, L. J. Helman, M. J. Cooper, M. M. Rechler, M. A. Israel

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Abstract

Insulin-like growth factor II (IGF-II) mRNA was increased in two of eight neuroblastomas and in eight of eight pheochromocytomas, tumors of the adrenal medulla that occur in childhood and adulthood, respectively. RNA encoding the type I IGF receptor, the receptor thought to mediate the mitogenic effects of IGF-I and IGF-II, also was uniformly expressed in these cells. To assess the role of IGF-II in the growth of these tumor cells, we have used the SK-N-AS cultured neuroblastoma cell line, which can be continuously propagated in mitogen-free medium, as a model system. Our results strongly suggest that IGF-II, synthesized by SK-N-AS cells and acting through type I IGF receptors, contributes to the autonomous growth of this tumor cell line. (a) SK-N-AS cells synthesized large amounts of IGF-II RNA and secreted > 50 ng/ml of IGF-II (as determined by specific radioimmuno- and radioreceptor assays). Little, if any, IGF-I RNA or immunoreactive IGF-I were detected. (b) SK-N-AS cells possess type I IGF receptors. (c) Exogenous IGF-I and IGF-II stimulated DNA synthesis in SK-N-AS cells, and this stimulation was abolished by a blocking antibody to the type I IGF receptor. (d) This anti-receptor antibdy also abolished the multiplication of SK-N-AS cells in the absence of added mitogens. We conclude that IGF-II is an autocrine growth factor for SK-N-AS cells and suggest that this mechanism may contribute to the growth of some adrenal medullary tumors.

Original languageEnglish (US)
Pages (from-to)829-839
Number of pages11
JournalJournal of Clinical Investigation
Volume84
Issue number3
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • Medicine(all)

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    El-Badry, O. M., Romanus, J. A., Helman, L. J., Cooper, M. J., Rechler, M. M., & Israel, M. A. (1989). Autonomous growth of a human neuroblastoma cell line is mediated by insulin-like growth factor II. Journal of Clinical Investigation, 84(3), 829-839. https://doi.org/10.1172/JCI114243