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*Pleural Disorders
The Journal of Immunology, 2000, 164: 4271-4276.
Copyright © 2000 by The American Association of Immunologists

Stem Cell Factor Plays a Major Role in the Recruitment of Eosinophils in Allergic Pleurisy in Mice Via the Production of Leukotriene B41

Andre Klein*, Andre Talvani*, Denise C. Cara{dagger}, Kenia L. Gomes*, Nicholas W. Lukacs{ddagger} and Mauro M. Teixeira2,*

* Immunopharmacology Laboratory, Departamento de Farmacologia and {dagger} Departmento de Patologia, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil; and {ddagger} Department of Pathology, University of Michigan, Ann Arbor, MI 48109

The understanding of the mechanisms underlying eosinophil migration into tissue is an essential step in the development of novel therapies aimed at treating allergic diseases where eosinophil recruitment and activation are thought to play an essential role. In this study, we have examined the effects of the in vivo administration of stem cell factor (SCF) on eosinophil recruitment and tested whether endogenous SCF was involved in mediating eosinophil recruitment in response to Ag challenge in sensitized mice. The intrapleural injection of SCF induced a time- and concentration-dependent recruitment of eosinophils in mice. In allergic mice, SCF message was expressed early after Ag challenge and returned to baseline levels after 8 h. In agreement with the ability of SCF to induce eosinophil recruitment and its expression in the allergic reaction, an anti-SCF polyclonal Ab abrogated eosinophil recruitment when given before Ag challenge. SCF increased the levels of leukotriene B4 (LTB4) in the pleural cavity of mice and an LTB4 receptor antagonist, CP105,696, abrogated the effects of SCF on eosinophil recruitment. Similarly, recruitment of eosinophils in the allergic reaction was virtually abolished by CP105,696. Together, our data favor the hypothesis that the local release of SCF following Ag challenge may activate and/or prime mast cells for IgE-mediated release of inflammatory mediators, especially LTB4. The mediators released in turn drive the recruitment of eosinophils. Inhibition of the function of SCF in vivo may reduce the migration of eosinophils to sites of allergic inflammation and may, thus, be a relevant principle in the treatment of allergic diseases.




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