Molecular basis for selective eosinophil trafficking in asthma: A multistep paradigm.
Asthma is characterized by a 50- to 100-fold increase in the number of eosinophils relative to neutrophils in the bronchial mucosa. This increase is not the result of a single molecular event but of the cumulative and sequential effects of several approximately 4-fold increases in selective eosinophil versus neutrophil migration, occurring at a number of stages in the life cycle of the eosinophil. These steps include (1) effects on the bone marrow, mediated principally by IL-5, which result in a 4-fold increase in circulating eosinophils, (2) selective tethering of eosinophils to venular endothelium through the combined effects of P-selectin/P-selectin glycoprotein ligand 1 and very late activation antigen-4/vascular cell adhesion molecule-1, which has the potential for an up to 10-fold increase in eosinophil versus neutrophil adhesion, (3) selective chemotaxis under the influence of CC chemokines, and (4) prolonged survival, again mediated by IL-5. These events are integrated and directed by allergen-specific T(H)2 lymphocytes through the generation of IL-5, IL-4, and IL-13. The implications of this multistep process are that antagonists of IL-5, very late activation antigen-4, P-selectin glycoprotein ligand 1, and CCR3 as well as IL-4 and IL-13 each have the potential to markedly inhibit eosinophil recruitment in asthma.
Wardlaw
A J
AJ
Division of Respiratory Medicine, Leicester University Medical School, Leicester, United Kingdom.
D000818:Animals; D001249:Asthma / Q000276:immunology*; D002448:Cell Adhesion; D002465:Cell Movement / Q000276:immunology*; D002470:Cell Survival; D002630:Chemotactic Factors; D004804:Eosinophils / Q000276:immunology* / Q000502:physiology; D006410:Hematopoiesis; D006801:Humans; D015848:Interleukin-5 / Q000276:immunology
D002630:Chemotactic Factors; D015848:Interleukin-5