Switch from αvβ5 to αvβ6 integrin is required for CD9-regulated keratinocyte migration and MMP-9 activation

FEBS Lett. 2014 Nov 3;588(21):4044-52. doi: 10.1016/j.febslet.2014.09.027. Epub 2014 Oct 1.

Abstract

Our previous research found that tetraspanin CD9 is downregulated in migrating epidermis during wound healing, and CD9 downregulation contributes to keratinocyte migration via matrix metalloproteinase-9 (MMP-9) activation. However, little is known about the mechanisms involved in CD9-regulated keratinocyte migration and MMP-9 activation. In this study, we revealed that the expressions of integrin subunits β5 and β6 were regulated by CD9. Furthermore, CD9 silencing triggered the switch from αvβ5 to αvβ6 integrin in HaCaT keratinocytes and CD9 overexpression reversed the switch. Importantly, integrin αvβ6 functional blocking antibody 10D5 significantly inhibited CD9 silencing-induced keratinocyte migration and MMP-9 activation, suggesting that the switch from αvβ5 to αvβ6 integrin plays a key role in CD9-regulated cell migration and MMP-9 activation in keratinocytes.

Keywords: CD9; Integrin; Keratinocyte; Matrix metalloproteinase-9; Migration.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies / immunology
  • Antigens, Neoplasm / immunology
  • Antigens, Neoplasm / metabolism*
  • Cell Line
  • Cell Movement*
  • Down-Regulation
  • Enzyme Activation
  • Gene Silencing
  • Humans
  • Integrins / immunology
  • Integrins / metabolism*
  • Keratinocytes / cytology*
  • Matrix Metalloproteinase 9 / metabolism*
  • Receptors, Vitronectin / metabolism*
  • Tetraspanin 29 / deficiency
  • Tetraspanin 29 / genetics
  • Tetraspanin 29 / metabolism*

Substances

  • Antibodies
  • Antigens, Neoplasm
  • Integrins
  • Receptors, Vitronectin
  • Tetraspanin 29
  • integrin alphaVbeta5
  • integrin alphavbeta6
  • Matrix Metalloproteinase 9