alpha 2 integrin subunit cytoplasmic domain-dependent cellular migration requires p38 MAPK

J Biol Chem. 2001 Mar 23;276(12):9503-11. doi: 10.1074/jbc.M006286200. Epub 2000 Dec 19.


The alpha(2) integrin subunit cytoplasmic domain uniquely supported epidermal growth factor (EGF)-stimulated migration on type I collagen. p38 MAP kinase- and phosphatidylinositol 3-kinase-specific inhibitors, but not a MEK-specific inhibitor, eliminated EGF-stimulated and unstimulated alpha(2)-cytoplasmic domain-dependent migration. Following adhesion to collagenous matrices, cells expressing the full-length alpha(2) integrin subunit, but not cells expressing a chimeric alpha(2) integrin subunit in which the alpha(2)-cytoplasmic domain was replaced by the cytoplasmic domain of the alpha(1)-subunit, exhibited sustained and robust phosphorylation of p38 MAP kinase. Expression of dominant negative p38 MAP kinase inhibited alpha(2)-cytoplasmic domain-dependent, EGF-stimulated migration as well as unstimulated migration on collagen. Expression of constitutively active Rac1(Val-12) augmented p38 MAP kinase activation and alpha(2)-cytoplasmic domain-dependent migration. It also rescued the ability of cells expressing the alpha(1)-cytoplasmic domain to activate p38 MAPK and to migrate. These results suggest that the alpha(2) integrin cytoplasmic domain uniquely stimulates the p38 MAP kinase pathway that is required for unstimulated and EGF-stimulated migration on type I collagen.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Antigens, CD / chemistry
  • Antigens, CD / metabolism*
  • Cell Line
  • Cell Movement*
  • Cytoplasm / metabolism*
  • Integrin alpha2
  • Mice
  • Mitogen-Activated Protein Kinases / metabolism*
  • Phosphorylation
  • p38 Mitogen-Activated Protein Kinases


  • Antigens, CD
  • Integrin alpha2
  • Mitogen-Activated Protein Kinases
  • p38 Mitogen-Activated Protein Kinases