Biometals

, Volume 18, Issue 2, pp 179–190 | Cite as

Heavy metal interference with growth hormone signalling in trout hepatoma cells RTH-149

  • Barbara Marchi
  • Bruno Burlando
  • Isabella Panfoli
  • Francesco Dondero
  • Aldo Viarengo
  • Gabriella Gallo
Article

Abstract

We have studied the effects of heavy metals (Hg2+, Cu2+, Cd2+) on growth hormone (GH) activation of tyrosine kinase and Ca2+ signaling in the trout (Oncorhynchusmykiss) hepatoma cell line RTH-149. Molecular cloning techniques using primer designed on Oncorhynchus spp. growth hormone receptor (GHR) genes allowed to isolate a highly homologous cDNA fragment from RTH-149 mRNA. Thereafter, cells were analysed by Western blotting or, alternatively, with Ca2+ imaging using fura-2/AM. Exposure of cells to ovine GH alone produced a stimulation of the JAK2/STAT5 pathway and intracellular free Ca2+ variations similar to what has been observed in mammalian models. Cell pre-exposure to Cu2+, Hg2+ or Cd2+ affected cell response to GH by enhancing (Cu2+) or inhibiting (Cd2+) the phosphorylation of JAK2 and STAT5. Heavy metals induced the activation of the MAP kinase p38, and pre-exposure to Hg2+ or Cu2+ followed by GH enhanced the effect of metal alone. Image analysis of fura2-loaded cells indicated that pre-treatment with Hg2+ prior to GH produced a considerable increase of the [Ca2+]i variation produced by either element, while using Cu2+ or Cd2+ the result was similar but much weaker. Data suggest that heavy metals interfere with GH as follows: Hg2+ is nearly ineffective on JAK/STAT and strongly synergistic on Ca2+ signaling; Cu2+ is activatory on JAK/STAT and slightly activatory on Ca2+; Cd2+ is strongly inhibitory on JAK/STAT and slightly activatory on Ca2+; heavy metals could partially activate STAT via p38 independently from GH interaction.

Keywords

cell calcium JAK2 p38 STAT5 trout GH receptor 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Barbara Marchi
    • 1
  • Bruno Burlando
    • 2
  • Isabella Panfoli
    • 1
  • Francesco Dondero
    • 2
  • Aldo Viarengo
    • 2
  • Gabriella Gallo
    • 1
  1. 1.Dipartimento di BiologiaUniversità di GenovaGenovaItaly
  2. 2.DISAVUniversità del Piemonte OrientaleAlessandriaItaly

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