title: Blockade of PSGL-1 attenuates CD14+ monocytic cell recruitment in intestinal mucosa and ameliorates ileitis in SAMP1/Yit mice.
abstract: The pathogenesis of Crohn's disease (CD) is not known. However, monocytes and macrophages are thought to play important roles in the development of mucosal inflammation. Therefore, in this study, we examined the role of monocyte-endothelial cell interactions in senescence-accelerated mouse P1 (SAMP1)/Yit mice, a murine model of spontaneous ileitis. Fluorescence-labeled CD14+ monocytic cells isolated from the spleen and mesenteric lymph nodes of AKR/J (control) mice were injected into the tail veins of recipient (AKR/J and SAMP1/Yit) mice, and migration in the postcapillary venules (PCV) of Peyer's patches, submucosal venules, and villus microvessels of the terminal ileum was monitored by using an intravital microscope. Rolling and adhesion of CD14+ monocytic cells in the PCV of Peyer's patches and microvessels of the terminal ileum were increased in SAMP1/Yit mice. An immunohistochemical study showed increased expression of P-selectin glycoprotein-1 (PSGL-1), P-selectin, and vascular cell adhesion molecule-1 in the terminal ileum of SAMP1/Yit mice. Antibodies against these three adhesion molecules significantly inhibited adhesion of CD14+ monocytic cells to the PCV of Peyer's patches and microvessels of the terminal ileum, treatment with an anti-PSGL-1 monoclonal antibody (mAb) showing the strongest suppressive effect. Anti-PSGL-1 mAb also attenuated T cell adhesion in microvessels of intestinal mucosa. In addition, periodical administration of an anti-PSGL-1 mAb for 7 weeks significantly ameliorated ileitis of SAMP1/Yit mice. The results suggest that PSGL-1-P-selectin interaction plays an important role in monocyte-endothelial cell interactions and the development of ileitis in a murine model of CD and that the blockade of this adhesion molecule may be a novel strategy for treating CD.
authors.affiliation: National Defense Medical College, 2-3 Namiki, Tokorozawa, Saitama 359-8513, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Inoue
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tsuzuki
authors.forename: Koji
authors.initials: K
authors.lastname: Matsuzaki
authors.forename: Hisayuki
authors.initials: H
authors.lastname: Matsunaga
authors.forename: Junichi
authors.initials: J
authors.lastname: Miyazaki
authors.forename: Ryota
authors.initials: R
authors.lastname: Hokari
authors.forename: Yoshikiyo
authors.initials: Y
authors.lastname: Okada
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kawaguchi
authors.forename: Shigeaki
authors.initials: S
authors.lastname: Nagao
authors.forename: Kazuro
authors.initials: K
authors.lastname: Itoh
authors.forename: Satoshi
authors.initials: S
authors.lastname: Matsumoto
authors.forename: Soichiro
authors.initials: S
authors.lastname: Miura
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage* / Q000276:immunology; D015703:Antigens, CD / Q000187:drug effects / Q000276:immunology; D015214:Antigens, Differentiation, Myelomonocytic / Q000187:drug effects / Q000276:immunology; D002448:Cell Adhesion / Q000502:physiology; D042783:Endothelial Cells / Q000276:immunology / Q000502:physiology; D007079:Ileitis / Q000188:drug therapy / Q000276:immunology* / Q000503:physiopathology; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D007413:Intestinal Mucosa / Q000276:immunology*; D018950:Lipopolysaccharide Receptors / Q000276:immunology*; D008297:Male; D008562:Membrane Glycoproteins / Q000037:antagonists & inhibitors* / Q000276:immunology; D051379:Mice; D008806:Mice, Inbred AKR; D016513:Mice, SCID; D009000:Monocytes / Q000276:immunology / Q000502:physiology*; D019007:P-Selectin / Q000187:drug effects / Q000276:immunology; D019010:Vascular Cell Adhesion Molecule-1 / Q000187:drug effects / Q000276:immunology; D000097382:CD68 Molecule
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D018950:Lipopolysaccharide Receptors; D008562:Membrane Glycoproteins; D019007:P-Selectin; D019010:Vascular Cell Adhesion Molecule-1; C067980:CD68 antigen, human; D000097382:CD68 Molecule; C084882:P-selectin ligand protein