Premium
Protective effect of heme oxygenase‐1 on hepatic ischemia‐reperfusion injury through inhibition of platelet adhesion to the sinusoids
Author(s) -
Tamura Takafumi,
Kondo Tadashi,
Ogawa Koichi,
Fukunaga Kiyoshi,
Ohkohchi Nobuhiro
Publication year - 2013
Publication title -
journal of gastroenterology and hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.214
H-Index - 130
eISSN - 1440-1746
pISSN - 0815-9319
DOI - 10.1111/jgh.12075
Subject(s) - copp , reperfusion injury , heme oxygenase , platelet , medicine , heme , biliverdin , ischemia , pharmacology , endocrinology , biochemistry , chemistry , enzyme
Background and Aim Heme oxygenase‐1 ( HO ‐1) acts as a protector against hepatic inflammatory injury. HO ‐1 catalyzes the conversion of heme protein to biliverdin, free iron, and carbon monoxide. Pro‐inflammatory responses play critical roles in hepatic ischemia‐reperfusion ( I / R ) injury, and carbon monoxide effectively downregulates I / R injury. The aim of this study was to evaluate the mechanism by which HO ‐1 reduces warm I / R injury. Methods S prague– D awley rats were divided into two groups: the 20‐min ischemia group (control group; n = 6) and the 20‐min ischemia with cobalt protoporphyrin ( CoPP group; n = 6). CoPP is an inducer of HO ‐1 in the sinusoids. K upffer cells were labeled using the liposome entrapment method , and platelets were labeled with rhodamine‐6 G . The adherent platelets were observed for up to 120 min after reperfusion by intravital microscopy. Results In the control group, the number of adherent platelets significantly increased than in the CoPP group. Terminal deoxynucleotidyl transferase‐mediated dUTP nick end labeling‐positive cells were observed after 120 min of reperfusion in the control group. They were not observed in the CoPP group. In the CoPP group, serum alanine transaminase and interleukin‐6 levels reduced after reperfusion. Moreover, the flow velocity of platelets in the hepatic sinusoid markedly increased. Conclusions This study suggests that HO ‐1 inhibits platelet adhesion to sinusoids. Such inhibition leads to the prevention of hepatic I / R injury.