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Multiple signal transduction pathways regulate clusterin (gp 80) gene expression in MDCK cells

C Gutacker1, R Flach, P Diel

  • 1Institut für Biochemie, Johannes Gutenberg-Universität Mainz, Germany.

Journal of Molecular Endocrinology
|October 1, 1996
PubMed
Summary

This study reveals how clusterin gene expression is regulated in kidney cells. Glucocorticoids, progesterone, and epidermal growth factor repress it, while protein kinase C activation induces it.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Clusterin (apolipoprotein J) is a multifunctional glycoprotein involved in lipid transport, complement inhibition, and cell interactions.
  • Clusterin gene expression increases during tissue injury, remodeling, and hormone-withdrawal-induced apoptosis.

Purpose of the Study:

  • To investigate the regulation of clusterin gene expression in the MDCK kidney epithelial cell line.
  • To identify specific signaling pathways that modulate clusterin mRNA levels.

Main Methods:

  • Treatment of MDCK cells with glucocorticoids, progesterone, epidermal growth factor, and phorbol ester (TPA).
  • Use of chelerythrine, a protein kinase C (PKC) inhibitor.
  • Quantification of clusterin mRNA levels.

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Main Results:

  • Glucocorticoids, progesterone, and epidermal growth factor repressed clusterin mRNA expression in MDCK cells.
  • 12-O-tetradecanoyl-phorbol-13-acetate (TPA), a PKC activator, induced clusterin mRNA.
  • Chelerythrine, a PKC inhibitor, repressed clusterin gene expression, indicating a role for PKC signaling.

Conclusions:

  • The clusterin gene is subject to complex regulation by multiple signal transduction pathways in kidney epithelial cells.
  • These findings provide a model for studying the interplay between different signaling cascades controlling clusterin expression.
  • Further characterization of these interactions can elucidate the role of clusterin in cellular processes.