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Gene and protein expression of proteinase-activated
receptor-1, 2 in a murine model of acute graft host disease |
| Quan LI MD 1, Weiming LI MD 1, Ping ZOU MD 1, Jian ZHANG BM 2, |
| 1.Institute of Hematology,
Tongji Medical College, Huazhong University of Science and Technology,
Wuhan 430022, China; 2.Department of General
Surgery, Xiangfan Central Hospital, Xiangfan 441021, China; |
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Abstract Proteinase-activated receptors (PARs) are a novel subclass of seven transmembrane-spanning, G protein-coupled receptors. PAR-1 and PAR-2 are widely expressed in a variety of cells and are found to be involved in many physiological and pathological processes including inflammation and immune response. However, little is known about the function of PAR-1, 2 in acute graft vs host disease (GVHD). In the present study, we first detected the expression of PAR-1, 2 protein and mRNA in a murine model of acute GVHD using the methods of immunohistochemistry, Western blot and quantitative real-time polymerase chain reaction (PCR). Syngeneic hematopoietic stem cell transplantation (HSCT) mice served as controls. The relative gene expression level of PAR-1 was significantly increased in the skin, liver, small intestine of allogeneic HSCT mice (in skin: 0.039±0.013 vs 0.008±0.002 of controls, P=0.009; in liver: 0.165±0.006 vs 0.017±0.006 of controls, P=0.004; in small intestine: 0.215±0.009 vs 0.016±0.002 of controls, P=0.003), but not in the stomach, lung and kidney of allogeneic HSCT mice (P>0.05). PAR-2 mRNA expression in the liver and small intestine of allogeneic HSCT mice (in liver: 0.010±0.002 vs 0.003±0.001 of controls, P=0.008; in small intestine: 0.006±0.001 vs 0.003±0.001 of controls, P=0.024) was increased significantly, but PAR-2 mRNA expression in the other organs (P>0.05) was not found to be significantly elevated. PAR-1, 2 protein expression was in accordance with the mRNA expression, as shown by Western blot. Using immunohistochemistry the present study demonstrated that there was strong PAR-1, 2 immunoreactivity in the epithelial cell and vascular endothelial cell of target organs of acute GVHD. Our findings of markedly increased expression of PAR-1, 2 in target organs of acute GVHD suggest that PAR-1 and PAR-2 may play an important role in the pathogenesis of acute GVHD.
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| Keywords
graft vs host disease
proteinase-activated receptor
murine model
hematopoietic stem cell transplantation
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Issue Date: 05 September 2009
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