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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; Zhi, W B; Kumar, S; Doulias, P T; Rafikova, O; Pillich, H; Chakraborty, T; Lucas, R; Verin, A D; Catravas, J D; She, J X; Black, S M; Fulton, D J R.
Afiliación
  • Chen F; Department of Forensic Medicine, Nanjing Medical University, Nanjing, Jiangsu, China; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA. Electronic address: fchen@njmu.edu.cn.
  • Wang Y; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Rafikov R; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Haigh S; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Zhi WB; Center for Biotechnology and Genomic Medicine, Augusta University, Augusta, Georgia 30912, USA.
  • Kumar S; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Doulias PT; Department of Pediatrics, Children's Hospital of Philadelphia Research Institute, Philadelphia, PA 19104, USA.
  • Rafikova O; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Pillich H; Institute for Medical Microbiology, Justus Liebig University, Germany.
  • Chakraborty T; Institute for Medical Microbiology, Justus Liebig University, Germany.
  • Lucas R; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA; Department of Pharmacology, Augusta University, Augusta, Georgia 30912, USA.
  • Verin AD; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Catravas JD; Old Dominion University, Norfolk, VA, USA.
  • She JX; Center for Biotechnology and Genomic Medicine, Augusta University, Augusta, Georgia 30912, USA.
  • Black SM; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA.
  • Fulton DJR; Vascular Biology Center, Augusta University, Augusta, Georgia 30912, USA; Department of Pharmacology, Augusta University, Augusta, Georgia 30912, USA. Electronic address: dfulton@augusta.edu.
Biochem Pharmacol ; 127: 34-45, 2017 03 01.
Article en En | MEDLINE | ID: mdl-28017778
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Toxinas Bacterianas / Endotelio Vascular / Proteína de Unión al GTP rhoA / Proteínas de Choque Térmico / Proteínas Hemolisinas / Compuestos Nitrosos Límite: Animals / Humans Idioma: En Revista: Biochem Pharmacol Año: 2017 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Toxinas Bacterianas / Endotelio Vascular / Proteína de Unión al GTP rhoA / Proteínas de Choque Térmico / Proteínas Hemolisinas / Compuestos Nitrosos Límite: Animals / Humans Idioma: En Revista: Biochem Pharmacol Año: 2017 Tipo del documento: Article Pais de publicación: Reino Unido