Silencing of Fas-associated Death Domain Protects Mice from Septic Lung Inflammation and Apoptosis
| Autor: | Naoyuki Matsuda, Yusuke Kurobe, Shun-ichiro Kageyama, Yuichi Hattori, Yasunori Yoshihara, Ken-ichi Takano, Yasuo Takano, Seiji Yamamoto |
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| Rok vydání: | 2009 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine Small interfering RNA Fas-Associated Death Domain Protein Acute Lung Injury Nitric Oxide Synthase Type II Apoptosis Inflammation Lung injury Critical Care and Intensive Care Medicine Sepsis Mice Intensive care In Situ Nick-End Labeling medicine Animals Gene Silencing FADD RNA Small Interfering Lung Death domain Caspase 8 Mice Inbred BALB C biology Tumor Necrosis Factor-alpha business.industry Hydrogen-Ion Concentration bacterial infections and mycoses medicine.disease TNF Receptor-Associated Death Domain Protein Up-Regulation Receptors TNF-Related Apoptosis-Inducing Ligand Immunology biology.protein medicine.symptom business Spleen |
| Zdroj: | American Journal of Respiratory and Critical Care Medicine. 179:806-815 |
| ISSN: | 1535-4970 1073-449X |
| DOI: | 10.1164/rccm.200804-534oc |
| Popis: | A better understanding of the molecular mechanisms involved in the pathogenesis of sepsis and its resultant organ failure and new therapeutic approaches and targets are urgently needed. Accumulating evidence suggests that apoptosis plays an important role in the pathophysiology of sepsis and that apoptosis may be detrimental in septic acute lung injury (ALI).We tested the hypothesis that systemic administration of small interfering RNA (siRNA) targeting Fas-associated death domain (FADD), which recruits procaspase-8 into the death-inducing signaling complex, may be protective in septic ALI and mortality.Polymicrobial sepsis was induced by cecal ligation and puncture (CLP) in BALB/c mice. In vivo delivery of siRNA was performed by using a transfection reagent at 10 hours after CLP. As a negative control, animals received nonsense (scrambled) siRNA.In CLP-induced septic mice, surface expression of death receptors was up-regulated, and FADD was highly expressed. DNA fragmentation ladder and transferase-mediated dUTP nick end labeling assays showed that treatment with FADD siRNA suppressed apoptosis induction in septic lungs. This siRNA treatment prevented the ALI development in CLP mice, as indicated by the findings that blood-gas derangements, histologic lung damage, and increased pulmonary inflammatory cells were greatly improved. Finally, FADD siRNA administration dramatically improved the survival of CLP mice.These results indicate the pathophysiologic significance of the death receptor apoptotic pathway, including FADD, in septic ALI and the potential usefulness of FADD siRNA for gene therapy of the septic syndrome. |
| Databáze: | OpenAIRE |
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