Effects of leukocyte and platelet depletion on ischemia--reperfusion injury to dog pancreas.
OBJECTIVE
Ischemia-reperfusion injury has been studied in various organs. Effects of leukocyte and platelet depletion on ischemia-reperfusion injury were evaluated using the isolated, perfused dog pancreas in vivo.


METHODS
Pancreatic exocrine and endocrine functions were stimulated by an intra-arterial injection of cholecystokinin (10(-12) mol) and intravenous injection of glucose and arginine (1 g/kg body wt), respectively. The functions before and after 60 minutes of ischemia were evaluated in the no treatment and in the leukocyte and platelet depletion groups.


RESULTS
Cholecystokinin increased prostaglandin I2 and thromboxane A2 production and stimulated exocrine pancreatic secretion. Glucose and arginine stimulated insulin and glucagon release from the pancreas. Sixty minutes of ischemia followed by 60 minutes of reperfusion damaged the pancreatic acinar and ductular cells. Ischemia of 60 minutes followed by 90 minutes of reperfusion damaged beta cells. Removal of leukocytes (97.6%) and platelets (99.4%) by using a filter throughout the experiment prevented the ischemia-reperfusion injury, reduced plasma lipid peroxide and thromboxane A2, and increased prostaglandin I2 levels.


CONCLUSIONS
Leukocytes and platelets seem to damage the pancreas during ischemia-reperfusion by increasing the peroxidation of structurally important cell membrane lipids and reduced the thromboxane A2 prostaglandin I2 ratio, a predictor of cellular injury.
Kuroda
T
T
Department of Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
Shiohara
E
E
Homma
T
T
Furukawa
Y
Y
Chiba
S
S
D015121:6-Ketoprostaglandin F1 alpha / Q000097:blood; D000681:Amylases / Q000097:blood; D000818:Animals; D001792:Blood Platelets / Q000502:physiology*; D004285:Dogs; D005260:Female; D066298:In Vitro Techniques; D007511:Ischemia / Q000473:pathology*; D007958:Leukocyte Count; D007962:Leukocytes / Q000502:physiology*; D008054:Lipid Peroxides / Q000097:blood; D008297:Male; D010179:Pancreas / Q000098:blood supply* / Q000378:metabolism / Q000473:pathology*; D010187:Pancreatic Hormones / Q000097:blood; D010976:Platelet Count; D015427:Reperfusion Injury / Q000473:pathology*; D013929:Thromboxane B2 / Q000097:blood; D014680:Veins
D008054:Lipid Peroxides; D010187:Pancreatic Hormones; D013929:Thromboxane B2; D015121:6-Ketoprostaglandin F1 alpha; D000681:Amylases