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Syndecan-4 regulates platelet-derived growth factor-mediated MAP kinase activation by altering intracellular reactive

Jungyean Kim1, Jung-hyun Lee, Hey Sun Park

  • 1Department of Life Sciences, Division of Life and Pharmaceutical Sciences and the Center for Cell Signaling and Drug Discovery Research, Ewha Womans University, Daehyun-dong, Seodaemoon-Gu, Seoul 120-750, Republic of Korea.

FEBS Letters
|July 16, 2008
PubMed

Insights

Syndecan-4 increases reactive oxygen species (ROS) by regulating the NADH oxidase component Nox1. This mechanism mediates platelet-derived growth factor-induced MAP kinase activation in cells.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Syndecan-4 is a cell adhesion receptor involved in cellular interactions.
  • Cell adhesion is increasingly linked to the generation of reactive oxygen species (ROS).

Purpose of the Study:

  • To investigate the role of syndecan-4 in regulating growth factor-induced ROS generation.
  • To understand the molecular mechanisms by which syndecan-4 influences ROS production and downstream signaling.

Main Methods:

  • Overexpression of syndecan-4 in rat embryo fibroblasts (REFs).
  • Knockdown of Nox1 expression using small inhibitory RNAs.
  • Measurement of ROS levels.
  • Assessment of MAP kinase activity.

Main Results:

  • Syndecan-4 overexpression led to increased ROS levels in REFs.
  • Nox1 expression was upregulated in syndecan-4-overexpressing cells.
  • Knockdown of Nox1 diminished syndecan-4-mediated ROS generation.
  • Syndecan-4 enhanced platelet-derived growth factor (PDGF)-induced MAP kinase activity, correlating with ROS generation.

Conclusions:

  • Syndecan-4 plays a key role in regulating ROS generation.
  • Syndecan-4-mediated ROS production involves the NADH oxidase component Nox1.
  • Syndecan-4 regulates PDGF-induced MAP kinase activation through modulation of ROS generation.

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