Study data from Chang Gung Memorial Hospital update knowledge of pediatric gastroenterology
2007 NOV 22 -- According to recent research from Kaohsiung, Taiwan, "Oxidative stress is known to be involved in the pathogenesis of biliary atresia (BA), but the mechanism has yet to be elucidated. We studied 8-hydroxydeoxyguanosine (8-OHdG) and mitochondrial copy number as potential markers for oxidative stress in BA Hepatic immunoreactive 8-OHdG expression was investigated during the early stage of BA when the patients received Kasai portoenterostomy (KP), during the late stage when the patients received liver transplantation (LT), in patients with choledochal cyst as disease control, and in patients with histologically normal liver as normal control." "Apoptosis of liver cells was examined by terminal deoxynucleotidyl transferase-mediated 2'-deoxyuridine 5-triphosphate-biotin nick end-labeling stain. The mitochondrial DNA copy number was measured by real-time polymerase chain reaction The number of hepatocytes positive for inummoreactive 8-OHdG was significantly increased in KP (65% +/- 18%) compared with LT (30% +/- 32%; P = 0.029) and choledochal cyst (25% +/- 20%; P = 0.037). The 8-OHdG labeling index was significantly correlated with the grade of chronic hepatitis activity (Spearman r=0.495; P=0.037). The hepatocyte terminal deoxynucleotidyl transferase-mediated 2'-deoxyuridine 5'triphosphate-biotin nick end-labeling index in KP (15% +/- 4%) was significantly higher than that in LT (5% +/- 2%; P = 0.018) and in choledochal cyst (3% +/- 2%; P=0.010)," wrote M.M. Tiao and colleagues, Chang Gung Memorial Hospital. The researchers concluded: "Mitochondrial copy number was significantly less in KP than in LT (7.33 +/- 0.75 vs 8.91 +/- 1.32; P = 0.045) and in normal control (7.33 +/- 0.75 vs 9.20 +/- 1.20; P = 0.02 1) The early stage of BA is associated with stronger inflammatory reaction, augmented oxidative DNA, and mitochondrial DNA damage as manifested by higher immunoreactive 8-OHdG and apoptotic activities and by a decrease in mitochondrial copy number." Tiao and colleagues published their study in the Journal of Pediatric Gastroenterology and Nutrition (Early stage of biliary atresia is associated with significant changes in 8-hydroxydeoxyguanosine and mitochondrial copy number. Journal of Pediatric Gastroenterology and Nutrition, 2007;45(3):329-334). For additional information, contact J.H. Chuang, Chang Gung Memorial Hospital, Dept. of Pediatrics Surgery, Kaohsiung, Taiwan. Publisher contact information for the Journal of Pediatric Gastroenterology and Nutrition is: Lippincott Williams & Wilkins, 530 Walnut St., Philadelphia, PA 19106-3621, USA. Keywords: Taiwan, Kaohsiung, Pediatric Gastroenterology, Chang Gung Memorial Hospital. This article was prepared by Hospital Law Week editors from staff and other reports. Copyright 2007, Hospital Law Week via NewsRx.com.
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