Adhesion molecule LFA-1/ICAM-1 influences on LPS-induced megakaryocytic emperipolesis in the rat bone marrow.
To investigate the effect of adhesion molecules on the occurrence of megakaryocytic emperipolesis of neutrophils, we examined the expression of lymphocyte function-associated antigen 1 (LFA-1) and intercellular adhesion molecule 1 (ICAM-1) in the bone marrow of lipopolysaccharide (LPS)-treated rats (experiment I) and the occurrence of megakaryocytic emperipolesis in anti-LFA-1 antibody-treated rats (experiment II). In experiment I, rats were injected with LPS intravenously at a daily dose of 0.5 mg/kg for 3 days. ICAM-1 was intensely stained on megakaryocytes in LPS treated rats, as detected by flow cytometric analysis. ICAM-1 was immunostained in the megakaryocytes showing emperipolesis. LFA-1 was immunostained in the neutrophils engulfed by megakaryocytes. In experiment II, rats received anti-LFA-1 antibody intravenously at a single dose of 3 mg/kg. One hour after treatment, rats were given LPS intravenously as a single dose of 0.5 mg/kg. The incidence of megakaryocytic emperipolesis was markedly lower in the anti-LFA-1 antibody + LPS group than in the LPS alone group. These findings suggest that the occurrence of megakaryocytic emperipolesis is partly dependent on adhesion molecules via LFA-1/ICAM-1.
Tanaka
M
M
Department of Toxicologic Pathology, Fukui Institute for Safety Research, Ono Pharmaceutical Co., Japan.
Aze
Y
Y
Fujita
T
T
D000818:Animals; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry / Q000379:methods / Q000662:veterinary; D007150:Immunohistochemistry; D018799:Intercellular Adhesion Molecule-1 / Q000032:analysis / Q000502:physiology*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000032:analysis / Q000502:physiology*; D008297:Male; D008533:Megakaryocytes / Q000737:chemistry / Q000166:cytology* / Q000187:drug effects*; D008854:Microscopy, Electron / Q000379:methods / Q000662:veterinary; D009504:Neutrophils / Q000737:chemistry / Q000166:cytology / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors
D008070:Lipopolysaccharides; D016169:Lymphocyte Function-Associated Antigen-1; D018799:Intercellular Adhesion Molecule-1