Estrogens and Insulin-Like Growth Factor 1 Modulate Neoplastic Cell Growth in Human Cholangiocarcinoma

Am J Pathol. 2006 Sep;169(3):877-88. doi: 10.2353/ajpath.2006.050464.

Abstract

We investigated the expression of estrogen receptors (ERs), insulin-like growth factor 1 (IGF-1), and IGF-1R (receptor) in human cholangiocarcinoma and cholangiocarcinoma cell lines (HuH-28, TFK-1, Mz-ChA-1), evaluating the role of estrogens and IGF-1 in the modulation of neoplastic cell growth. ER-alpha, ER-beta, IGF-1, and IGF-1R were expressed (immunohistochemistry) in all biopsies (18 of 18) of intrahepatic cholangiocarcinoma. ER-alpha was expressed (Western blot) only by the HuH-28 cell line (intrahepatic cholangiocarcinoma), whereas ER-beta, IGF-1, and IGF-1R were expressed in the three cell lines examined. In serum-deprived HuH-28 cells, serum readmission induced stimulation of cell proliferation that was inhibited by ER and IGF-1R antagonists. 17beta-Estradiol and IGF-1 stimulated proliferation of HuH-28 cells to a similar extent to that of MCF7 (breast cancer) but greater than that of TFK-1 and Mz-ChA-1, inhibiting apoptosis and exerting additive effects. These effects of 17beta-estradiol and IGF-1 were associated with enhanced protein expression of ER-alpha, phosphorylated (p)-ERK1/2 and pAKT but with decreased expression of ER-beta. Finally, transfection of IGF-1R anti-sense oligonucleotides in HuH-28 cells markedly decreased cell proliferation. In conclusion, human intrahepatic cholangiocarcinomas express receptors for estrogens and IGF-1, which cooperate in the modulation of cell growth and apoptosis. Modulation of ER and IGF-1R could represent a strategy for the management of cholangiocarcinoma.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Apoptosis / drug effects
  • Breast Neoplasms / metabolism
  • Breast Neoplasms / pathology
  • Cell Line, Tumor
  • Cell Proliferation / drug effects*
  • Cholangiocarcinoma / metabolism*
  • Cholangiocarcinoma / pathology
  • Estradiol / metabolism
  • Estradiol / pharmacology*
  • Estrogen Receptor alpha / biosynthesis
  • Estrogen Receptor beta / biosynthesis
  • Female
  • Gene Expression Regulation, Neoplastic / drug effects
  • Humans
  • Insulin-Like Growth Factor I / metabolism
  • Insulin-Like Growth Factor I / pharmacology*
  • Liver Neoplasms / metabolism*
  • Liver Neoplasms / pathology
  • Mitogen-Activated Protein Kinase 1 / metabolism
  • Mitogen-Activated Protein Kinase 3 / metabolism
  • Oligonucleotides, Antisense / pharmacology
  • Oncogene Protein v-akt / metabolism
  • Protein Biosynthesis / drug effects
  • Protein Processing, Post-Translational / drug effects
  • Receptor, IGF Type 1 / antagonists & inhibitors
  • Receptor, IGF Type 1 / metabolism
  • Transfection

Substances

  • Estrogen Receptor alpha
  • Estrogen Receptor beta
  • Oligonucleotides, Antisense
  • Estradiol
  • Insulin-Like Growth Factor I
  • Receptor, IGF Type 1
  • Oncogene Protein v-akt
  • Mitogen-Activated Protein Kinase 1
  • Mitogen-Activated Protein Kinase 3