Expression of insulin-like growth factor (IGF)-II and IGF-I receptor during proliferation and differentiation of CaCo-2 human colon carcinoma cells

R. Zarrilli, S. Pignata, M. Romano, A. Gravina, S. Casola, C. B. Bruni, A. M. Acquaviva

Research output: Contribution to journalArticle

Abstract

We have studied the expression of insulin-like growth factor type II (IGF- II) and its autocrine role during the proliferation and differentiation of the CaCo-2 colon carcinoma cell line. IGF-II RNA levels were high in proliferating cells and decreased by more than 10-fold when cells ceased to proliferate and differentiated. Immunoreactive IGF-II protein was high in the conditioned media of proliferating cells and decreased 20-fold in the media of differentiated cells. Reduced IGF-II expression was associated with a decrease in IGF-I receptor number that was high in proliferating cells (approximately 80,000 binding sites/cell) and reduced by 4-fold in differentiated cells. Exogenously added IGF-II was able to stimulate proliferation of serum-deprived cells in a dose-dependent fashion. IGF-II acted through the IGF-I receptor, since both basal and IGF-II-stimulated cell proliferation was inhibited by the monoclonal antibody α-IR3, which blocks the binding sites of the IGF-I receptor. The inhibition of CaCo-2 basal cell growth by the α-IR3 antibody suggests that IGF-II may act as an autocrine growth factor for these cells.

Original languageEnglish
Pages (from-to)1085-1091
Number of pages7
JournalCell Growth and Differentiation
Volume5
Issue number10
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

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