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Effect of Heat Shock Protein 70 on Inducible Nitric Oxide Synthase during Sepsis in Rats  

Lee, Yong Keun (Department of Oral and Maxillofacial Surgery, School of Dentistry, Chonbuk National University)
Shin, Hyo-Keun (Department of Oral and Maxillofacial Surgery, School of Dentistry, Chonbuk National University)
Kwon, Woon Yong (Department of Emergency Medicine, Seoul National University College of Medicine)
Suh, Gil Joon (Department of Emergency Medicine, Seoul National University College of Medicine)
Youn, Yeo Kyu (Department of Surgery, Seoul National University College of Medicine)
Publication Information
Journal of Trauma and Injury / v.21, no.1, 2008 , pp. 59-65 More about this Journal
Abstract
Purpose: The aim of this study was to evaluate the effect of overexpression of heat shock protein 70 (HSP70) on the expression of inducible nitric oxide synthase and on the concentration of nitric oxide and to determine the mechanism for the relationship between HSP70 and inducible nitric oxide synthase (iNOS) in sepsis. Methods: Experiments were performed on male Sprague-Dawley rats, and sepsis was induced by using cecal ligation and puncture (CLP). Glutamine (GLN) or saline was administered 1 h after initiation of sepsis. We acquired serum and lung tissues from the rats 12 h or 24 h after initiation of sepsis. We analyzed the concentration of nitric oxide, the expression of HSP70 in the lung, and the gene expression of iNOS in the lung. Results: In CLP+GLN, glutamine given after initiation of sepsis enhanced the expression of HSP70 in the lung at 12 h (CLP+GLN vs. CLP:: $47.19{\pm}10.04$ vs. $33.22{\pm}8.28$, p = 0.025) and 24 h (CLP+GLN vs. CLP: $47.06{\pm}10.60$ vs. $31.90{\pm}4.83$, p = 0.004). In CLP+GLN, glutamine attenuated the expression of iNOS mRNA in the lung at 12 h (CLP+GLN vs. CLP: $4167.17{\pm}951.59$ vs. $5513.73{\pm}1051.60$, p = 0.025) and 24 h (CLP+GLN vs. CLP: $9,437.65{\pm}2,521.07$ vs. $18,740.27{\pm}8,241.20$, p = 0.016) and reduced the concentration of nitric oxide in serum at 12 h (CLP+GLN vs. CLP: $0.86{\pm}0.48$ vs. $3.82{\pm}2.53{\mu}mol/L$, p = 0.016) and 24 h (CLP+GLN vs. CLP: $0.39{\pm}0.25$ vs. $1.85{\pm}1.70{\mu}mol/L$, p = 0.025). Conclusion: The overexpression of HSP70 induced by the administration of glutamine in sepsis attenuated the gene expression of iNOS and reduced the concentration of nitric oxide.
Keywords
Heat shock protein 70; Inducible nitric oxide synthase; Nitric oxide; Sepsis;
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Times Cited By KSCI : 2  (Citation Analysis)
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