Autotaxin and lysophosphatidic acid stimulate intestinal cell motility by redistribution of the actin modifying protein villin to the developing lamellipodia

Exp Cell Res. 2008 Feb 1;314(3):530-42. doi: 10.1016/j.yexcr.2007.10.028. Epub 2007 Nov 12.

Abstract

Autotaxin (ATX) is a potent tumor cell motogen that can produce lysophosphatidic acid (LPA) from lysophosphatidylcholine. LPA is a lipid mediator that has also been shown to modulate tumor cell invasion. Autotaxin mRNA is expressed at significant levels in the intestine. Likewise, LPA2 receptor levels have been shown to be elevated in colon cancers. The molecular mechanism of ATX/LPA-induced increase in intestinal cell migration however, remains poorly understood. Villin is an intestinal and renal epithelial cell specific actin regulatory protein that modifies epithelial cell migration. In this study we demonstrate that both Caco-2 (endogenous villin) and MDCK (exogenous villin) cells, which express primarily LPA2 receptors, show enhanced cell migration in response to ATX/LPA. ATX and LPA treatment results in the rapid formation of lamellipodia and redistribution of villin to these cell surface structures, suggesting a role for villin in regulating this initial event of cell locomotion. The LPA-induced increase in cell migration required activation of c-src kinase and downstream tyrosine phosphorylation of villin by c-src kinase. LPA stimulated cell motility was determined to be insensitive to pertussis toxin, but was regulated by activation of PLC-gamma 1. Together, our results show that in epithelial cells ATX and LPA act as strong stimulators of cell migration by recruiting PLC-gamma 1 and villin, both of which participate in the initiation of protrusion.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Actins / metabolism
  • Animals
  • Caco-2 Cells
  • Carcinoma / metabolism
  • Cell Line
  • Cell Movement / drug effects
  • Cell Movement / physiology*
  • Dogs
  • Humans
  • Intestinal Mucosa / cytology
  • Intestinal Mucosa / drug effects
  • Intestinal Mucosa / metabolism*
  • Intestinal Neoplasms / metabolism
  • Lysophospholipids / pharmacology
  • Lysophospholipids / physiology*
  • Microfilament Proteins / drug effects
  • Microfilament Proteins / metabolism*
  • Microfilament Proteins / pharmacology
  • Multienzyme Complexes / pharmacology
  • Multienzyme Complexes / physiology*
  • Phosphodiesterase I / pharmacology
  • Phosphodiesterase I / physiology*
  • Phospholipase C gamma / drug effects
  • Phospholipase C gamma / metabolism
  • Phosphoric Diester Hydrolases
  • Phosphorylation / drug effects
  • Protein Transport / drug effects
  • Protein Transport / physiology
  • Pseudopodia / drug effects
  • Pseudopodia / metabolism*
  • Pseudopodia / ultrastructure
  • Pyrophosphatases / pharmacology
  • Pyrophosphatases / physiology*
  • Receptors, Lysophosphatidic Acid / drug effects
  • Receptors, Lysophosphatidic Acid / metabolism
  • src-Family Kinases / drug effects
  • src-Family Kinases / metabolism

Substances

  • Actins
  • Lysophospholipids
  • Microfilament Proteins
  • Multienzyme Complexes
  • Receptors, Lysophosphatidic Acid
  • villin
  • src-Family Kinases
  • Phosphoric Diester Hydrolases
  • Phosphodiesterase I
  • Phospholipase C gamma
  • alkylglycerophosphoethanolamine phosphodiesterase
  • Pyrophosphatases
  • lysophosphatidic acid