Central involvement of Rho family GTPases in TNF-α-mediated bovine pulmonary endothelial cell apoptosis

Irina Petrache, Michael T. Crow, Michael Neuss, Joe G.N. Garcia

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

In our recent studies, we defined a critical role for increased levels of myosin light chain (MLC) phosphorylation, a regulatory event in the interaction between actin and myosin in TNF-α-induced pulmonary endothelial cell actomyosin rearrangement and apoptosis. The Rho GTPase effector, Rho kinase is an important signaling effector governing levels of MLC phosphorylation which contributes to plasma membrane blebbing in several models of apoptosis. In this study, we directly assessed the role of Rho kinase in TNF-α-induced endothelial cell microfilament rearrangement and apoptosis. Inhibition of RhoA GTPase activity by the overexpression of dominant negative RhoA attenuates TNF-α-triggered stress fiber formation, consistent with Rho activation as a key event in TNF-α-induced cytoskeletal rearrangement. Furthermore, pharmacologic inhibition of Rho kinase as well as dominant negative RhoA overexpression dramatically reduced TNF-α-induced bovine endothelial apoptosis reflected by nucleosomal fragmentation as well as caspase 7, 3, and 8 activation. These results indicate that Rho kinase-dependent cytoskeletal rearrangement is critical for early apoptotic events, possibly in the assembly of the death-inducing signaling complex leading to initiator and effector caspase activation, and suggest a novel role for Rho GTPases in endothelial cell apoptosis.

Original languageEnglish (US)
Pages (from-to)244-249
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume306
Issue number1
DOIs
StatePublished - Jun 20 2003
Externally publishedYes

Keywords

  • Acute lung injury
  • Cytoskeleton
  • DISC
  • Protease
  • RhoA
  • TNFR1

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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