Whole-Blood Flow-Cytometric Analysis of Eosinophil EG2 Expression as a Marker of the Pathological Conditions of Asthma

Using a simple technique detecting the eosinophil fraction in whole-blood flow cytometry, we measured intracellular antigen EG2 (a monoclonal antibody to eosinophil cationic protein) in 56 asthmatic patients (26 during an attack and 30 during an asymptomatic period) and 22 healthy subjects to determ...

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Veröffentlicht in:International archives of allergy and immunology 1998-01, Vol.117 (Suppl 1), p.77-80
Hauptverfasser: Kuwasaki, Tomoe, Chihara, Junichi, Kayaba, Hiroyuki, Kamata, Yumiko, Oyamada, Hazime, Saito, Norihiro, Shioya, Takanobu, Sasaki, Masahiro, Kagaya, Manabu, Tsuda, Akira
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container_end_page 80
container_issue Suppl 1
container_start_page 77
container_title International archives of allergy and immunology
container_volume 117
creator Kuwasaki, Tomoe
Chihara, Junichi
Kayaba, Hiroyuki
Kamata, Yumiko
Oyamada, Hazime
Saito, Norihiro
Shioya, Takanobu
Sasaki, Masahiro
Kagaya, Manabu
Tsuda, Akira
description Using a simple technique detecting the eosinophil fraction in whole-blood flow cytometry, we measured intracellular antigen EG2 (a monoclonal antibody to eosinophil cationic protein) in 56 asthmatic patients (26 during an attack and 30 during an asymptomatic period) and 22 healthy subjects to determine whether EG2 reflects the pathological stages of allergy. Methods: In brief, preparations of the sample included the following procedures: (1) hemolyzation of heparinized or EDTA-mixed whole blood; (2) fixation of white blood cells with 0.4% parabenzoquinone (PBQ) or paraformaldehyde (PFA); (3) permeabilizing the cell membrane with n-octyl-β-D-glucopyranoside, and (4) staining of intracellular EG2 antigen with monoclonal EG2 antibody and FITC-labeled secondary antibody. Results: In PBQ-fixed samples, there was a clearer boundary of the eosinophil fraction with a higher yield and purity than in those fixed with PFA. The number of EG2-positive eosinophils was significantly greater in subjects during attacks than in asymptomatic patients. In addition, when compared with normal controls, asthmatic subjects had significantly greater numbers of EG2-positive eosinophils regardless of their current condition. Conclusion: Eosinophil intracellular EG2 may indicate the pathological stage of asthma. This simple technique for analysing the properties of eosinophils using whole-blood flow cytometry would save time and labor in laboratories.
doi_str_mv 10.1159/000053578
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Methods: In brief, preparations of the sample included the following procedures: (1) hemolyzation of heparinized or EDTA-mixed whole blood; (2) fixation of white blood cells with 0.4% parabenzoquinone (PBQ) or paraformaldehyde (PFA); (3) permeabilizing the cell membrane with n-octyl-β-D-glucopyranoside, and (4) staining of intracellular EG2 antigen with monoclonal EG2 antibody and FITC-labeled secondary antibody. Results: In PBQ-fixed samples, there was a clearer boundary of the eosinophil fraction with a higher yield and purity than in those fixed with PFA. The number of EG2-positive eosinophils was significantly greater in subjects during attacks than in asymptomatic patients. In addition, when compared with normal controls, asthmatic subjects had significantly greater numbers of EG2-positive eosinophils regardless of their current condition. Conclusion: Eosinophil intracellular EG2 may indicate the pathological stage of asthma. This simple technique for analysing the properties of eosinophils using whole-blood flow cytometry would save time and labor in laboratories.</abstract><cop>Basel, Switzerland</cop><pub>Karger</pub><pmid>9758904</pmid><doi>10.1159/000053578</doi><tpages>4</tpages></addata></record>
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identifier ISSN: 1018-2438
ispartof International archives of allergy and immunology, 1998-01, Vol.117 (Suppl 1), p.77-80
issn 1018-2438
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source MEDLINE; Karger Journals; Alma/SFX Local Collection
subjects Adult
Allergic diseases
Asthma - blood
Asthma - immunology
Benzoquinones
Biological and medical sciences
Biomarkers - blood
Blood Proteins - analysis
Case-Control Studies
Cell Membrane Permeability
Eosinophil Granule Proteins
Eosinophils - immunology
Female
Fixatives
Flow Cytometry - methods
Formaldehyde
Glucosides
Humans
Immunopathology
Inflammation Mediators - blood
Male
Medical sciences
Middle Aged
Polymers
Respiratory and ent allergic diseases
Ribonucleases
title Whole-Blood Flow-Cytometric Analysis of Eosinophil EG2 Expression as a Marker of the Pathological Conditions of Asthma
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