Insulin-like growth factor-II in nonislet cell tumors associated with hypoglycemia: Increased levels of messenger ribonucleic acid

William L. Lowe, Charles T. Roberts, Derek Leroith, Maria T. Rojeski, Thomas J. Merimee, Serge Teng Fui, Harry Keen, Dagmar Arnold, James Mersey, Sheldon Gluzman, Daniel Spratt, Richard C. Eastman, Jesse Roth

    Research output: Contribution to journalArticle

    51 Scopus citations

    Abstract

    The role of insulin-like growth factor-II (IGFII) in the hypoglycemia associated with nonislet cell tumors is controversial. In this study we have addressed this question by measuring the IGF-II mRNA levels in extracts of these tumors. Hybridization of a 32P-labeled IGF-II cDNA to a Northern blot of RNA from three nonislet cell tumors associated with hypoglycemia (a hemangiopericytoma, fibrosarcoma, and malignant mesenchymal tumor) demonstrated six hybridizing bands, 6.8, 5.6, 4.7, 3.6, 2.6, and 2.1 kilobases in length. These bands were similar to those described by others in a range of tumors and normal tissues. Tissue IGF-II mRNA levels were quantitated using a solution hybridization/RNase protection assay. IGF-IImRNA levels in the tumors were similar to the level present in one line of human hepatoblastoma-derived Hep G2 cells, 5- to 6-fold higher than that in another line of Hep G2 cells, and 2- to 3-fold higher than that in term placenta. In contrast, little or no IGF-II mRNA was detected in a nonfunctioning islet cell adenoma or normal spleen. There was no evidence for amplification of the IGF-II gene in the one tumor in which it was sought. These data suggest that nonislet cell tumors associated with hypoglycemia produce large amounts of IGF-II mRNA and that this IGF-II mRNA appears to be the product of an IGF-II gene, which is apparently normal in the region encoding mature IGF-II peptide.

    Original languageEnglish (US)
    Pages (from-to)1153-1159
    Number of pages7
    JournalJournal of Clinical Endocrinology and Metabolism
    Volume69
    Issue number6
    DOIs
    StatePublished - Dec 1989

    ASJC Scopus subject areas

    • Endocrinology, Diabetes and Metabolism
    • Biochemistry
    • Endocrinology
    • Clinical Biochemistry
    • Biochemistry, medical

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    Lowe, W. L., Roberts, C. T., Leroith, D., Rojeski, M. T., Merimee, T. J., Fui, S. T., Keen, H., Arnold, D., Mersey, J., Gluzman, S., Spratt, D., Eastman, R. C., & Roth, J. (1989). Insulin-like growth factor-II in nonislet cell tumors associated with hypoglycemia: Increased levels of messenger ribonucleic acid. Journal of Clinical Endocrinology and Metabolism, 69(6), 1153-1159. https://doi.org/10.1210/jcem-69-6-1153