title: Eosinophil transendothelial migration induced by the bronchoalveolar lavage fluid of acute eosinophilic pneumonia.
abstract: Acute eosinophilic pneumonia (AEP) is characterized by a massive pulmonary infiltration of eosinophils. Mechanisms regulating the selective accumulation of eosinophils in AEP have not been fully established. The objective of this study was to evaluate the mechanisms of eosinophil accumulation in alveolar spaces through examination of bronchoalveolar lavage fluid (BALF) from AEP patients (AEP-BALF).
  
  
  
  Eosinophils were isolated from the blood of healthy subjects and were placed on a human pulmonary microvascular endothelial cell monolayer cultured on Transwell filters (Coster, Cambridge, MA, USA). A saline control solution or BALF from patients with AEP, sarcoidosis or hypersensitivity pneumonitis was applied to the lower compartment, and the transendothelial migration of the eosinophils was evaluated. The concentrations of cytokines and chemokines in BALF were also measured.
  
  
  
  Transmigration of eosinophils across endothelial cells was only induced by the AEP-BALF. This transmigration was blocked by anti-β2integrin mAb. The concentrations of eotaxin-2 and monocyte chemotactic protein (MCP)-4, which are CC chemokine receptor (CCR) 3 ligands, were elevated in the AEP-BALF, and anti-CCR3 mAb or anti-MCP-4 mAb inhibited the AEP-BALF-induced transmigration of eosinophils. Furthermore, the concentration of leukotriene (LT) B4was increased in the AEP-BALF, and an LTB4receptor antagonist partially suppressed the AEP-BALF-induced transmigration of eosinophils.
  
  
  
  These findings suggest that CCR3 ligands including eotaxin-2 and MCP-4, and LTB4play a role in the accumulation of eosinophils in AEP.
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.|Allergy Center, Saitama Medical University, Saitama, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Nakagome
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.
authors.forename: Hisakazu
authors.initials: H
authors.lastname: Shoda
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.
authors.forename: Tetsu
authors.initials: T
authors.lastname: Shirai
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.|Allergy Center, Saitama Medical University, Saitama, Japan.
authors.forename: Fuyumi
authors.initials: F
authors.lastname: Nishihara
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.|Allergy Center, Saitama Medical University, Saitama, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Soma
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.|Allergy Center, Saitama Medical University, Saitama, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Uchida
authors.affiliation: Department of Internal Medicine, Fureai Yokohama Hospital, Yokohama, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Sakamoto
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Saitama, Japan.|Allergy Center, Saitama Medical University, Saitama, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Nagata
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000542:Alveolitis, Extrinsic Allergic / Q000276:immunology; D001992:Bronchoalveolar Lavage Fluid; D016022:Case-Control Studies; D054423:Chemokine CCL24 / Q000276:immunology; D018925:Chemokines / Q000276:immunology; D016207:Cytokines / Q000276:immunology*; D004804:Eosinophils / Q000276:immunology*; D005260:Female; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D018945:Monocyte Chemoattractant Proteins / Q000276:immunology; D011657:Pulmonary Eosinophilia / Q000276:immunology*; D054397:Receptors, CCR3 / Q000276:immunology; D017565:Sarcoidosis, Pulmonary / Q000276:immunology; D057705:Transendothelial and Transepithelial Migration / Q000276:immunology*; D055815:Young Adult
chemical_list: C099677:CCL13 protein, human; C515484:CCL24 protein, human; C515350:CCR3 protein, human; D054423:Chemokine CCL24; D018925:Chemokines; D016207:Cytokines; D018945:Monocyte Chemoattractant Proteins; D054397:Receptors, CCR3
keywords: allergy; cytokine; eosinophil; interstitial lung disease; sarcoidosis