Flow cytometric basophil activation tests: Staining of exteriorized basophil granule matrix by fluorescent avidin versus appearance of CD63.
CD203c
CD63
avidin
basophil activation test
basophils
Journal
Cytometry. Part B, Clinical cytometry
ISSN: 1552-4957
Titre abrégé: Cytometry B Clin Cytom
Pays: United States
ID NLM: 101235690
Informations de publication
Date de publication:
11 2020
11 2020
Historique:
received:
09
12
2019
revised:
06
01
2020
accepted:
10
01
2020
pubmed:
6
2
2020
medline:
20
8
2021
entrez:
4
2
2020
Statut:
ppublish
Résumé
Staining of exteriorized basophil granule matrix by fluorescent avidin might be a reliable technique to monitor basophil degranulation. This study compares the avidin-based technique with the upregulation of CD203c and appearance of CD63 in response to various stimuli. Fourteen individuals responsive to anti-IgE, nine healthy controls, and five birch pollen-allergic patients, and five nonresponders were studied. Activation experiments included anti-IgE, fMLP, interleukin-(IL)-3, and birch pollen allergen. Basophil activation/degranulation was analyzed by flow cytometry and microscopy using anti-CD63, anti-CD203c, and avidin. Stimulation with anti-IgE, fMLP, and relevant allergen results in upregulation of CD203c, CD63 appearance, and an increase in avidin binding. In response to anti-IgE and allergen, upregulation of CD203c peaks within 10 min, CD63 and avidin binding reach a plateau after 10-20 min. CD63 staining leads to a bimodal distribution, avidin staining causes a unimodal shift with a less clear discrimination between degranulating and nondegranulating cells. In response to fMLP, upregulation of CD203c and CD63 and avidin binding are maximal after 2.5 min. Following incubation with anti-IgE and fMLP, percentages of CD203c+ cells are higher than those of CD63+ and avidin+ cells, pointing to a dissociation between activation and degranulation. Percentages of CD63+ cells are systemically higher than those of avidin+ cells. Incubated with IL-3 only upregulates CD203c, while no CD63 or avidin binding is observed. Staining of exteriorized proteoglycans by avidin is a reliable technique to quantify basophil degranulation but offers no added value when compared to traditional assays that use CD63 as a readout.
Sections du résumé
BACKGROUND
Staining of exteriorized basophil granule matrix by fluorescent avidin might be a reliable technique to monitor basophil degranulation. This study compares the avidin-based technique with the upregulation of CD203c and appearance of CD63 in response to various stimuli.
METHODS
Fourteen individuals responsive to anti-IgE, nine healthy controls, and five birch pollen-allergic patients, and five nonresponders were studied. Activation experiments included anti-IgE, fMLP, interleukin-(IL)-3, and birch pollen allergen. Basophil activation/degranulation was analyzed by flow cytometry and microscopy using anti-CD63, anti-CD203c, and avidin.
RESULTS
Stimulation with anti-IgE, fMLP, and relevant allergen results in upregulation of CD203c, CD63 appearance, and an increase in avidin binding. In response to anti-IgE and allergen, upregulation of CD203c peaks within 10 min, CD63 and avidin binding reach a plateau after 10-20 min. CD63 staining leads to a bimodal distribution, avidin staining causes a unimodal shift with a less clear discrimination between degranulating and nondegranulating cells. In response to fMLP, upregulation of CD203c and CD63 and avidin binding are maximal after 2.5 min. Following incubation with anti-IgE and fMLP, percentages of CD203c+ cells are higher than those of CD63+ and avidin+ cells, pointing to a dissociation between activation and degranulation. Percentages of CD63+ cells are systemically higher than those of avidin+ cells. Incubated with IL-3 only upregulates CD203c, while no CD63 or avidin binding is observed.
CONCLUSIONS
Staining of exteriorized proteoglycans by avidin is a reliable technique to quantify basophil degranulation but offers no added value when compared to traditional assays that use CD63 as a readout.
Identifiants
pubmed: 32012452
doi: 10.1002/cyto.b.21868
doi:
Substances chimiques
Tetraspanin 30
0
Avidin
1405-69-2
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
483-490Informations de copyright
© 2020 International Clinical Cytometry Society.
Références
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