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Blood Modulates the Kinetics of Reactive Oxygen Release in Pancreatic Ischemia-Reperfusion Injury.
MedLine Citation:
PMID:  22617706     Owner:  NLM     Status:  Publisher    
OBJECTIVES: Reason for the unsuccessful use of antioxidants in transplantation might be the unknown kinetics of reactive oxygen species (ROS) release. In this study, we compared the kinetics of ROS release from rat pancreata in the presence and absence of blood. METHODS: In vivo, ischemia-reperfusion injury (IRI) was induced in pancreata of male Wistar rats by occlusion of the arterial blood supply for 1 or 2 hours. In vitro, isolated pancreata were single-pass perfused with Krebs-Henseleit bicarbonate solution. Reactive oxygen species were quantified by electron spin resonance spectroscopy using CMH (1-hydroxy-3-methoxycarbonyl-2,2,5,5-tetramethylpyrrolidine) as spin label. Thiols (glutathione), nicotinamide adenine dinucleotide phosphate-oxidase activity, myeloperoxidase activity, and adenosine triphosphate content were measured. RESULTS: During reperfusion, an increase in IRI-induced ROS in arterial blood was noted after 2 hours of warm ischemia. In sharp contrast, ROS release was immediate and short lived in blood-free perfused organs. The degree of tissue damage correlated with nicotinamide adenine dinucleotide phosphate-oxidase activity and adenosine triphosphate content. Antioxidative capacity of tissues was reduced. CONCLUSIONS: Electron spin resonance spectroscopy in conjunction with spin labels allows for the detection of ROS kinetics in pancreatic IRI. Reactive oxygen species kinetics are dependent on the length of the ischemic period and the presence or absence of blood.
Hannes P Neeff; Olaf Sommer; Sebastian Meyer; Anja Tinelli; Moritz Scholtes; Ulrich T Hopt; Oliver Drognitz; Ernst von Dobschuetz
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-21
Journal Detail:
Title:  Pancreas     Volume:  -     ISSN:  1536-4828     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8608542     Medline TA:  Pancreas     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
From the *Department of Surgery, Albert-Ludwigs-University Freiburg; and †Schön Klinik Hamburg Eilbek, Clinic for Endocrine Surgery, Hamburg, Germany.
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