RhoA S-nitrosylation as a regulatory mechanism influencing endothelial barrier function in response to G+-bacterial toxins

F. Chen, Y. Wang, R. Rafikov, S. Haigh, Sanjiv Kumar, O. Rafikova, Rudolf Lucas, Alexander Dmitriyevich Verin, Stephen Matthew Black, David J Fulton

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Disruption of the endothelial barrier in response to Gram positive (G+) bacterial toxins is a major complication of acute lung injury (ALI) and can be further aggravated by antibiotics which stimulate toxin release. The integrity of the pulmonary endothelial barrier is mediated by the balance of disruptive forces such as the small GTPase RhoA, and protective forces including endothelium-derived nitric oxide (NO). How NO protects against the barrier dysfunction is incompletely understood and our goal was to determine whether NO and S-nitrosylation can modulate RhoA activity and whether this mechanism is important for G+ toxin-induced microvascular permeability. We found that the G+ toxin listeriolysin-O (LLO) increased RhoA activity and that NO and S-NO donors inhibit RhoA activity. RhoA was robustly S-nitrosylated as determined by biotin-switch and mercury column analysis. MS revealed that three primary cysteine residues are S-nitrosylated including cys16, cys20 and cys159. Mutation of these residues to serine diminished S-nitrosylation to endogenous NO and mutant RhoA was less sensitive to inhibition by S-NO. G+-toxins stimulated the denitrosylation of RhoA which was not mediated by S-nitrosoglutathione reductase (GSNOR), thioredoxin (TRX) or thiol-dependent enzyme activity but was instead stimulated directly by elevated calcium levels. Calcium-promoted the direct denitrosylation of WT but not mutant RhoA and mutant RhoA adenovirus was more effective than WT in disrupting the barrier integrity of human lung microvascular endothelial cells. In conclusion, we reveal a novel mechanism by which NO and S-nitrosylation reduces RhoA activity which may be of significance in the management of pulmonary endothelial permeability induced by G+-toxins.

Original languageEnglish (US)
Pages (from-to)34-45
Number of pages12
JournalBiochemical Pharmacology
Volume127
DOIs
StatePublished - Mar 1 2017

Fingerprint

Bacterial Toxins
Nitric Oxide
glutathione-independent formaldehyde dehydrogenase
Lung
Calcium
Thioredoxins
Monomeric GTP-Binding Proteins
Nitric Oxide Donors
Acute Lung Injury
Endothelial cells
Capillary Permeability
Enzyme activity
Biotin
Mercury
Sulfhydryl Compounds
Adenoviridae
Serine
Cysteine
Permeability
Endothelial Cells

Keywords

  • Endothelial
  • G-toxins
  • Nitric oxide
  • Permeability
  • RhoA
  • S-nitrosylation

ASJC Scopus subject areas

  • Biochemistry
  • Pharmacology

Cite this

RhoA S-nitrosylation as a regulatory mechanism influencing endothelial barrier function in response to G+-bacterial toxins. / Chen, F.; Wang, Y.; Rafikov, R.; Haigh, S.; Kumar, Sanjiv; Rafikova, O.; Lucas, Rudolf; Verin, Alexander Dmitriyevich; Black, Stephen Matthew; Fulton, David J.

In: Biochemical Pharmacology, Vol. 127, 01.03.2017, p. 34-45.

Research output: Contribution to journalArticle

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AU - Chen, F.

AU - Wang, Y.

AU - Rafikov, R.

AU - Haigh, S.

AU - Kumar, Sanjiv

AU - Rafikova, O.

AU - Lucas, Rudolf

AU - Verin, Alexander Dmitriyevich

AU - Black, Stephen Matthew

AU - Fulton, David J

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