トキタ ダイスケ   TOKITA Daisuke
  時田 大輔
   所属   医学部 医学科(東京女子医科大学病院)
   職種   教授
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Inhibition of Kupffer cell-mediated early proinflammatory response with carbon monoxide in transplant-induced hepatic ischemia/reperfusion injury in rats.
掲載誌名 正式名:Hepatology (Baltimore, Md.)
略  称:Hepatology
ISSNコード:15273350/02709139
掲載区分国外
巻・号・頁 48(5),pp.1608-20
著者・共著者 Tomiyama Koji, Ikeda Atsushi, Ueki Shinya, Nakao Atsunori, Stolz Donna B, Koike Yasushi, Afrazi Amin, Gandhi Chandrashekhar, Tokita Daisuke, Geller David A, Murase Noriko
発行年月 2008/11
概要 UNLABELLED:Proinflammatory responses play critical roles in hepatic ischemia/reperfusion (I/R) injury associating with liver transplantation (LTx), and carbon monoxide (CO) can effectively down-regulate them. Using wild-type (WT) to enhanced green fluorescent protein (EGFP)-transgenic rat LTx with 18-hour cold preservation in University of Wisconsin solution, this study analyzed the relative contribution of donor and host cells during early posttransplantation period and elucidated the mechanism of hepatic protection by CO. CO inhibited hepatic I/R injury and reduced peak alanine aminotransferase levels at 24 hours and hepatic necrosis at 48 hours. Abundant EGFP(+) host cells were found in untreated WT liver grafts at 1 hour and included nucleated CD45(+) leukocytes (myeloid, T, B, and natural killer cells) and EGFP(+) platelet-like depositions in the sinusoids. However, reverse transcription polymerase chain reaction (RT-PCR) analysis of isolated graft nonparenchymal cells (NPCs) revealed that I/R injury-induced proinflammatory mediators [for example, tumor necrosis factor alpha (TNF-alpha), interleukin-6 (IL-6), and inducible nitric oxide synthase (iNOS)] were not up-regulated in purified CD45(+) cells of donor or host origin. Instead, TNF-alpha and IL-6 messenger RNA (mRNA) elevation was exclusively seen in isolated CD68(+) cells, whereas iNOS mRNA up-regulation was seen in hepatocytes. Nearly all CD68(+) cells at 1 hour after LTx were EGFP(-) donor Kupffer cells, and CO efficiently inhibited TNF-alpha and IL-6 up-regulation in the CD68(+) Kupffer cell fraction. When graft Kupffer cells were inactivated with gadolinium chloride, activation of inflammatory mediators in liver grafts was significantly inhibited. Furthermore, in vitro rat primary Kupffer cell culture also showed significant down-regulation of lipopolysaccharide (LPS)-induced inflammatory responses by CO.CONCLUSION:These results indicate that CO ameliorates hepatic I/R injury by down-regulating graft
DOI 10.1002/hep.22482
PMID 18972563