Effect of the α3β1 integrin on the IL-1 stimulated activation of c-Jun N-terminal kinase (JNK) in CACO-2 cells

Academic Article

Abstract

  • Intestinal epithelial cells (IEC) are capable of responding to IL-1 stimulation by producing a variety of pro-inflammatory cytokines. Recently, we have found that binding of the α3β1 integrin may have a regulatory effect on IL-1 responses and intracellular signaling by suppressing cytokine secretion, mRNA expression and the downstream intracellular signaling events from IKK to NF-κB activation. In this study, we extend these findings by showing that treatment of the Caco-2 epithelial cells with a cross-linking anti-α3 integrin antibody resulted in a suppression in the levels of IL-1 induced AP-1 binding activity in nuclear extracts. Furthermore, suppressed levels of IL-1 induced c-Jun N-terminal kinase (JNK) phosphorylation and kinase activity were seen with the antibody treated cells. Cells cultured on purified laminin-5, the ligand for the α3β1 integrin, did not show significantly elevated levels of JNK phosphorylation after IL-1 stimulation while cells cultured on fibronectin yielded significantly elevated levels of IL-1 induced JNK phosphorylation. These results indicate that binding of the α3β1 integrin results in a suppression in the activation of the IL-1 induced intracellular signaling pathway from JNK to AP-1. This novel regulatory effect may be a potentially important mechanism to regulate IL-1 mediated responses by IEC. © 2007.
  • Authors

    Published In

  • Cytokine  Journal
  • Digital Object Identifier (doi)

    Author List

  • Stulic M; Lubin FD; O'Donnell PM; Tammariello SP; McGee DW
  • Start Page

  • 163
  • End Page

  • 170
  • Volume

  • 37
  • Issue

  • 2