Monocyte cell adhesion induced by a human aminoacyl-tRNA synthetase-associated factor, p43: Identification of the related adhesion molecules and signal pathways

Heonyong Park, Sang Gyu Park, Joong Won Lee, Taeho Kim, Gyuyoup Kim, Young Gyu Ko, Sunghoon Kim

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48 Citations (Scopus)


An aminoacyl-tRNA synthetase-associated factor, p43, was recently shown to be secreted to induce a proinflammatory response. Because a proinflammatory response involves the cell-cell adhesion between endothelial and immune cells, we first examined the mechanism of p43-induced cell-cell adhesion of myelomonocytic leukemia cells. Intercellular adhesion molecule-1 (ICAM-1) was up-regulated by p43 and mediated p43-induced cell-cell adhesion via the interaction with LFA-1 or Mac-1. We also investigated p43-stimulated signaling pathways involved in the homotypic THP-1 cell adhesion. Because the specific inhibitors for PI3-K (phosphatidylinositol 3-kinase), ERK (extracellular signal-regulating kinase), and p38 MAPK (mitogen-activated protein kinase) blocked p43-stimulated ICAM-1 expression and homotypic THP-1 cell adhesion, these kinases were responsible for p43-induced cell-cell adhesion. p43-Dependent activation of ERK was inhibited by PI3-K inhibitors, and the activation of p38 MAPK was not. Thus, the results of this work suggest that p43 should induce cell-cell adhesion via the PI3-K/ ERK- and p38 MAPK-dependent up-regulation of ICAM-1.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalJournal of Leukocyte Biology
Issue number2
Publication statusPublished - 2002 Feb 1
Externally publishedYes



  • Cell-cell adhesion
  • Integrin β
  • Intercellular adhesion molecule-1
  • Mitogen-activated protein kinase

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Cell Biology

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