Cyclic stretch activates ERK1/2 via G proteins and EGFR in alveolar epithelial cells

Eduardo Correa-Meyer, Liuska Pesce, Carmen Guerrero, Jacob I. Sznajder*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

MechanicaI stimuli are transduced into intracellular signals in lung alveolar epithelial cells (AEC). We studied whether mitogen-activated protein kinase (MAPK) pathways are activated during cyclic stretch of AEC. Cyclic stretch induced a rapid (within 5 min) increase in extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation in AEC. The inhibition of Na+, L-type Ca2+ and stretch-activated ion channels with amiloride, nifedipine, and gadolinium did not prevent the stretch-induced ERK1/2 activation. The inhibition of Grb2-SOS interaction with an SH3 binding sequence peptide, Ras with a farnesyl transferase inhibitor, and Raf-1 with forskolin did not affect the stretch-induced ERK1/2 phosphorylation. Moreover, cyclic stretch did not increase Ras activity, suggesting that stretch-induced ERK1/2 activation is independent of the classical receptor tyrosine kinase-MAPK pathway. Pertussis toxin and two specific epidermal growth factor receptor (EGFR) inhibitors (AG-1478 and PD-153035) prevented the stretch-induced ERK1/2 activation. Accordingly, in primary AEC, cyclic stretch activates ERK1/2 via G proteins and EGFR, in Na+ and Ca2+ influxes and Grb2-SOS-, Ras-, and Raf-1-independent pathways.

Original languageEnglish (US)
Pages (from-to)L883-L891
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume282
Issue number5 26-5
DOIs
StatePublished - 2002

Keywords

  • Epidermal growth factor receptor
  • Lung injury
  • Mechanical stress
  • Mechanotransduction
  • Mitogen-activated protein kinase

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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