Acute Increase in O-GlcNAc Improves Survival in Mice With LPS-Induced Systemic Inflammatory Response Syndrome

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Silva, Josiane Fernandes ^[1] ; Olivon, Vania C. ^[2] ; Mestriner, Fabiola Leslie A. C. ^[3] ; Zanotto, Camila Ziliotto ^[1] ; Ferreira, Raphael Gomes ^[1] ; Ferreira, Nathanne Santos ^[1] ; Silva, Carlos Alberto Aguiar ^[4] ; Luiz, Joao Paulo Mesquita ^[1] ; Alves, Juliano Vilela ^[1] ; Fazan, Rubens ^[4] ; Cunha, Fernando Queiroz ^[1] ; Alves-Filho, Jose Carlos ^[1] ; Tostes, Rita C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Pharmacol, Ribeirao Preto - Brazil

^[2] Univ Anhanguera UNIDERP, Campo Grande, MS - Brazil

^[3] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Surg & Anat, Ribeirao Preto - Brazil

^[4] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Physiol, Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN PHYSIOLOGY; v. 10, JAN 21 2020.
• Citações Web of Science: 0

Resumo

Sepsis is a systemic inflammatory response syndrome (SIRS) resulting from a severe infection that is characterized by immune dysregulation, cardiovascular derangements, and end-organ dysfunction. The modification of proteins by O-linked N-acetylglucosamine (O-GlcNAcylation) influences many of the key processes that are altered during sepsis, including the production of inflammatory mediators and vascular contractility. Here, we investigated whether O-GlcNAc affects the inflammatory response and cardiovascular dysfunction associated with sepsis. Mice received an intraperitoneal injection of lipopolysaccharide (LPS, 20 mg/Kg) to induce endotoxic shock and systemic inflammation, resembling sepsis-induced SIRS. The effects of an acute increase in O-GlcNAcylation, by treatment of mice with glucosamine (GlcN, 300 mg/Kg, i.v.) or thiamet-G (ThG, 150 mu g/Kg, i.v.), on LPS-associated mortality, production and release of cytokines by macrophages and vascular cells, vascular responsiveness to constrictors and blood pressure were then determined. Mice under LPS-induced SIRS exhibited a systemic and local inflammatory response with increased levels of interleukin-1 beta (IL-1 beta), interleukin-6 (IL-6) and tumor necrosis factor (TNF-alpha), as well as severe hypotension and vascular hyporesponsiveness, characterized by reduced vasoconstriction to phenylephrine. In addition, LPS increased neutrophil infiltration in lungs and produced significant lethality. Treatment with GlcN and ThG reduced systemic inflammation and attenuated hypotension and the vascular refractoriness to phenylephrine, improving survival. GlcN and ThG also decreased LPS-induced production of inflammatory cytokines by bone marrow-derived macrophages and nuclear transcription factor-kappa B (NF-kappa B) activation in RAW 264.7 NF-kappa B promoter macrophages. Treatment of mice with ThG increased O-glycosylation of NF-kappa B p65 subunit in mesenteric arteries, which was associated with reduced Ser(536) phosphorylation of NF-kappa B p65. Finally, GlcN also increased survival rates in mice submitted to cecal ligation and puncture (CLP), a sepsis model. In conclusion, increased O-GlcNAc reduces systemic inflammation and cardiovascular disfunction in experimental sepsis models, pointing this pathway as a potential target for therapeutic intervention. (AU)

• Processo FAPESP: 13/08216-2 - CPDI - Centro de Pesquisa em Doenças Inflamatórias
• Beneficiário: Fernando de Queiroz Cunha
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 16/16207-1 - Centro de Pesquisa em Doenças Inflamatórias - CRID
• Beneficiário: Josiane Fernandes da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado