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Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration
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Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration

Published on: May 19, 2016

Platelet-derived growth factor-BB and lysophosphatidic acid distinctly regulate hepatic myofibroblast migration

Pisit Tangkijvanich1, Andrew C Melton, Taned Chitapanarux

  • 1Department of Medicine, School of Medicine, University of California at Los Angeles, Los Angeles, California 90095, USA.

Experimental Cell Research
|November 21, 2002
PubMed

Insights

Lysophosphatidic acid (LPA) and platelet-derived growth factor-BB (PDGF) coordinate hepatic myofibroblast (HMF) migration. PDGF amplifies or attenuates LPA signaling, influencing HMF accumulation in liver injury.

Area of Science:

  • Cell Biology
  • Hepatology
  • Biochemistry

Background:

  • Hepatic myofibroblast (HMF) migration is crucial for liver fibrosis development.
  • The precise molecular mechanisms regulating HMF migration remain incompletely understood.

Purpose of the Study:

  • To investigate the effects of lysophosphatidic acid (LPA) and platelet-derived growth factor-BB (PDGF) on HMF migration.
  • To elucidate the roles of actin polymerization and FAK tyrosine phosphorylation in mediating these cellular responses.

Main Methods:

  • Cultured human HMFs were treated with varying concentrations of LPA and PDGF.
  • Measurements included actin polymerization, stress fiber assembly, FAK tyrosine phosphorylation, and cell migration.
  • Inhibition studies using cytochalasin D were performed.

Main Results:

  • LPA stimulated HMF migration, FAK phosphorylation, and stress fiber assembly in a sigmoidal dose-dependent manner.
  • PDGF exhibited a bell-shaped dose-response for HMF migration, FAK phosphorylation, and actin polymerization, with optimal effects at 10-25 ng/ml.
  • Cytochalasin D blocked LPA- and PDGF-induced migration by inhibiting FAK phosphorylation.
  • Low PDGF concentrations (1-10 ng/ml) synergized with LPA to enhance FAK phosphorylation and migration.
  • High PDGF concentrations (100-250 ng/ml) inhibited LPA-induced FAK phosphorylation and migration.

Conclusions:

  • PDGF and LPA differentially regulate FAK signaling to control HMF migration.
  • PDGF acts as both an amplifier and attenuator of LPA-induced signaling.
  • This coordinated regulation facilitates HMF accumulation in injured liver regions, contributing to fibrosis.

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