Expression and regulation of L-selectin on eosinophils from human adults and neonates
L-Selectin, previously known as LEC.CAM-1, LECAM-1, LAM1, and as the MEL-14, Leu-8, TQ1, and DREG-56 antigens, is a leukocyte membrane protein that participates in adhesion to endothelium. We studied its expression on eosinophils using flow cytometry and the MAb Dreg-56 and Leu-8. Unstimulated peripheral blood eosinophils from healthy adults expressed about one third the level of L-selectin as neutrophils (mean +/- SD specific fluorescence: 20.9 +/- 3.2 versus 54.5 +/- 8.4, p = 0.0001, n = 18). After stimulation with A23187, L-selectin expression on eosinophils was rapidly lost. This was temporally correlated with increased expression of Mac-1 (CD11b/CD18); the kinetics on eosinophils and neutrophils were similar. Eosinophil expression of L-selectin decreased modestly after stimulation with platelet activating factor, but was minimally affected by N-formyl-methionyl-leucyl-phenylalanine, leukotriene B4, or C5a compared with their effects on neutrophils. Eosinophils from cord blood of healthy neonates born at term expressed less L-selectin than adult eosinophils (10.4 +/- 3.8 versus 19.4 +/- 2.7, p = 0.0001, n = 9); the relative reduction was the same as on cord blood neutrophils (36.4 +/- 8.2 versus 55.5 +/- 4.8, p = 0.0001, n = 9). Relative to baseline expression, the responses of neonatal and adult cells to stimulation did not differ. We conclude that neonatal eosinophils have abnormalities in L-selectin expression similar to neonatal neutrophils and suggest that decreased expression of L-selectin and a diminished responsiveness to direct stimulation with chemotactic factors are possible mechanisms that may limit the exudation of eosinophils.
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
1992 |
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| Erschienen: |
1992 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:32 |
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| Enthalten in: |
Pediatric research - 32(1992), 4 vom: 22. Okt., Seite 465-71 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Smith, J B [VerfasserIn] |
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| Themen: |
126880-86-2 |
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| Anmerkungen: |
Date Completed 07.12.1992 Date Revised 20.11.2014 published: Print Citation Status MEDLINE |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM012595799 |
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| 245 | 1 | 0 | |a Expression and regulation of L-selectin on eosinophils from human adults and neonates |
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| 500 | |a Date Completed 07.12.1992 | ||
| 500 | |a Date Revised 20.11.2014 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a L-Selectin, previously known as LEC.CAM-1, LECAM-1, LAM1, and as the MEL-14, Leu-8, TQ1, and DREG-56 antigens, is a leukocyte membrane protein that participates in adhesion to endothelium. We studied its expression on eosinophils using flow cytometry and the MAb Dreg-56 and Leu-8. Unstimulated peripheral blood eosinophils from healthy adults expressed about one third the level of L-selectin as neutrophils (mean +/- SD specific fluorescence: 20.9 +/- 3.2 versus 54.5 +/- 8.4, p = 0.0001, n = 18). After stimulation with A23187, L-selectin expression on eosinophils was rapidly lost. This was temporally correlated with increased expression of Mac-1 (CD11b/CD18); the kinetics on eosinophils and neutrophils were similar. Eosinophil expression of L-selectin decreased modestly after stimulation with platelet activating factor, but was minimally affected by N-formyl-methionyl-leucyl-phenylalanine, leukotriene B4, or C5a compared with their effects on neutrophils. Eosinophils from cord blood of healthy neonates born at term expressed less L-selectin than adult eosinophils (10.4 +/- 3.8 versus 19.4 +/- 2.7, p = 0.0001, n = 9); the relative reduction was the same as on cord blood neutrophils (36.4 +/- 8.2 versus 55.5 +/- 4.8, p = 0.0001, n = 9). Relative to baseline expression, the responses of neonatal and adult cells to stimulation did not differ. We conclude that neonatal eosinophils have abnormalities in L-selectin expression similar to neonatal neutrophils and suggest that decreased expression of L-selectin and a diminished responsiveness to direct stimulation with chemotactic factors are possible mechanisms that may limit the exudation of eosinophils | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Research Support, U.S. Gov't, P.H.S. | |
| 650 | 7 | |a Cell Adhesion Molecules |2 NLM | |
| 650 | 7 | |a Chemotactic Factors |2 NLM | |
| 650 | 7 | |a Membrane Glycoproteins |2 NLM | |
| 650 | 7 | |a L-Selectin |2 NLM | |
| 650 | 7 | |a 126880-86-2 |2 NLM | |
| 700 | 1 | |a Kunjummen, R D |e verfasserin |4 aut | |
| 700 | 1 | |a Kishimoto, T K |e verfasserin |4 aut | |
| 700 | 1 | |a Anderson, D C |e verfasserin |4 aut | |
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