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Effects of cadmium on MAPK signalling pathways and HSP70 expression in a human trophoblast cell line

P Valbonesi1, L Ricci, S Franzellitti

  • 1Interdepartmental Centre for Environmental Science Research, University of Bologna, via S. Alberto 163, 48100 Ravenna, Italy.

Placenta
|June 24, 2008
PubMed

Insights

Cadmium (Cd) exposure activates mitogen-activated protein kinase (MAPK) pathways and heat shock protein 70 (HSP70) in placental cells, indicating potential disruption of reproductive tissue function during pregnancy.

Area of Science:

  • Reproductive Biology
  • Toxicology
  • Cell Signaling

Background:

  • Cadmium (Cd) is a recognized placental toxin.
  • Signal transduction and stress responses are critical in reproductive tissues.
  • Mitogen-activated protein kinases (MAPKs) and heat shock proteins (HSPs) are key players in cellular stress responses.

Purpose of the Study:

  • To investigate the effects of Cadmium (Cd) on signal transduction and stress-related pathways in reproductive tissues.
  • To examine the influence of Cd on MAPK (ERK1/2, JNK1/2, p38MAPK) activation in HTR-8/SVneo trophoblast cells.
  • To assess the HSP70 response in Cd-exposed cells and compare it with hydrogen peroxide (H2O2) effects.

Main Methods:

  • Utilized the HTR-8/SVneo extravillous trophoblast cell line as an experimental model.
  • Exposed cells to varying doses and durations of Cadmium (Cd) and hydrogen peroxide (H2O2).
  • Measured the activation of MAPK pathways (ERK1/2, JNK1/2, p38MAPK) and expression of HSP70 and related genes.

Main Results:

  • Cadmium (Cd) induced dose- and time-dependent activation of ERK1/2, JNK1/2, and p38MAPK.
  • Significant phosphorylation of ERK1/2 and JNK1/2 occurred after 1-hour exposure to 30 μM Cd; p38MAPK activation took 8 hours.
  • Cadmium (Cd) potently stimulated HSP70 and related gene expression, unlike H2O2 which had limited effects on HSP70 expression.

Conclusions:

  • Cadmium (Cd) triggers distinct stress responses in trophoblast cells, involving HSP70 and stress-activated protein kinases (SAPKs).
  • Cd exposure enhances ERK1/2 phosphorylation, suggesting a role in cellular stress mechanisms.
  • Non-physiological MAPK pathway activation by Cd may impair normal trophoblast cell functions crucial for pregnancy.

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