Selective regulation of expression of surface adhesion molecules Mac-1, L-selectin, and VLA-4 on human eosinophils and neutrophils.
We studied the differential expression of cellular adhesion molecules on the surface of purified human eosinophils and neutrophils caused by ex vivo activation with platelet-activating factor (PAF), formylmethionylleucylphenylalanine (FMLP), or recombinant human interleukin-5 (IL-5). PAF (10(-7) M) caused a 42.8 +/- 5.7% (mean +/- SEM) increase in Mac-1 expression in eosinophils (P < 0.01) and a 34.6 +/- 9.2% increase in Mac-1 expression in neutrophils (P < 0.05). PAF also caused a decrease in L-selectin expression in eosinophils (-37.0 +/- 8.1%, P < 0.001) and neutrophils (-14.1 +/- 3.2%, P < 0.05). FMLP (10(-6) M) caused a similar increase in Mac-1 expression in both eosinophils (P < 0.001 versus controls) and neutrophils (P < 0.01) and a comparable decrease in L-selectin expression in both eosinophils and neutrophils (P < 0.01). In contrast to the effects of PAF and FMLP, IL-5 affected selectively the surface expression of adhesion molecules in eosinophils but not neutrophils. Expression of Mac-1 increased by 44.3 +/- 7.5% in eosinophils (P < 0.001 versus controls) and by 0.7 +/- 1.2% in neutrophils (P = NS versus controls) after exposure to 10(-9) M IL-5. IL-5 also caused a 49.5 +/- 4.2% decrease in eosinophil L-selectin expression (P < 0.001) but had no effect on L-selectin expression in neutrophils. Eosinophil VLA-4 expression was not altered by any stimulus.(ABSTRACT TRUNCATED AT 250 WORDS)
Neeley
S P
SP
Department of Medicine, University of Chicago, IL 60637.
Hamann
K J
KJ
White
S R
SR
Baranowski
S L
SL
Burch
R A
RA
Leff
A R
AR
D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D004804:Eosinophils / Q000378:metabolism*; D006801:Humans; D015848:Interleukin-5 / Q000502:physiology; D019041:L-Selectin; D016177:Macrophage-1 Antigen / Q000096:biosynthesis*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000378:metabolism*; D010972:Platelet Activating Factor / Q000502:physiology; D016029:Receptors, Very Late Antigen / Q000096:biosynthesis*
D015815:Cell Adhesion Molecules; D015848:Interleukin-5; D016177:Macrophage-1 Antigen; D010972:Platelet Activating Factor; D016029:Receptors, Very Late Antigen; D019041:L-Selectin; D009240:N-Formylmethionine Leucyl-Phenylalanine