title: Protection of atherogenesis in thromboxane A2 receptor-deficient mice is not associated with thromboxane A2 receptor in bone marrow-derived cells.
abstract: In the previous study, we generated mice lacking thromboxane A2 receptor (TP) and apolipoprotein E, apoE(-/-)TP(-/-) mice, and reported that the double knockout mice developed markedly smaller atherosclerotic lesions than those in apoE(-/-) mice. To investigate the mechanism responsible for reduced atherosclerosis in apoE(-/-)TP(-/-) mice, we examined the role of TP in bone marrow (BM)-derived cells in the development of the atherosclerotic lesions. When we compared the function of macrophages in apoE(-/-) and in apoE(-/-)TP(-/-) mouse in vitro, there was no difference in the expression levels of cytokines and chemokines after stimulation with lipopolysaccharide. We then transplanted the BM from either apoE(-/-) or apoE(-/-)TP(-/-) mice to either apoE(-/-) or apoE(-/-)TP(-/-) mice after sublethal irradiation. After 12 weeks with high fat diet, we analyzed the atherosclerotic lesion of aortic sinus. When the BM from apoE(-/-) or apoE(-/-)TP(-/-) mice was transplanted to apoE(-/-) mice, the lesion size was almost the same as that of apoE(-/-) mice without BM transplantation. In contrast, when the BM from apoE(-/-) or apoE(-/-)TP(-/-) mice was transplanted to apoE(-/-)TP(-/-) mice, the lesion size was markedly reduced. These results indicate that the protection of atherogenesis in TP(-/-) mice is not associated with TP in BM-derived cells.
authors.affiliation: Department of Clinical Innovative Medicine, Kyoto University Graduate School of Medicine, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhuge
authors.forename: Hidenori
authors.initials: H
authors.lastname: Arai
authors.forename: Yang
authors.initials: Y
authors.lastname: Xu
authors.forename: Toshinori
authors.initials: T
authors.lastname: Murayama
authors.forename: Takuya
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Shuh
authors.initials: S
authors.lastname: Narumiya
authors.forename: Toru
authors.initials: T
authors.lastname: Kita
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yokode
mesh_terms: D000818:Animals; D001057:Apolipoproteins E / Q000235:genetics; D050197:Atherosclerosis / Q000235:genetics* / Q000473:pathology / Q000517:prevention & control*; D001854:Bone Marrow Cells / Q000378:metabolism*; D016026:Bone Marrow Transplantation; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000494:pharmacology; D018925:Chemokines / Q000378:metabolism; D016207:Cytokines / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D010766:Phosphorylation; D044244:Receptors, Thromboxane A2, Prostaglandin H2 / Q000235:genetics*; D013928:Thromboxane A2 / Q000096:biosynthesis*
chemical_list: D001057:Apolipoproteins E; D019086:Bridged Bicyclo Compounds, Heterocyclic; D018925:Chemokines; D016207:Cytokines; D005231:Fatty Acids, Unsaturated; D008070:Lipopolysaccharides; D044244:Receptors, Thromboxane A2, Prostaglandin H2; C061750:7-(3-(3-hydroxy-4-(4'-iodophenoxy)-1-butenyl)-7-oxabicyclo(2.2.1)heptan-2-yl)-5-heptenoic acid; D013928:Thromboxane A2; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3