Published ahead of print on June 9, 2005, doi:10.1165/rcmb.2005-0145OC
American Journal of Respiratory Cell and Molecular Biology. Vol. 33, pp. 254-261, 2005
© 2005 American Thoracic Society DOI: 10.1165/rcmb.2005-0145OC
Allergic ChallengeElicited Lipid Bodies Compartmentalize In Vivo Leukotriene C4 Synthesis within Eosinophils
Adriana Vieira-de-Abreu,
Edson F. Assis,
Gleice S. Gomes,
Hugo C. Castro-Faria-Neto,
Peter F. Weller,
Christianne Bandeira-Melo and
Patrícia T. Bozza
Laboratório de Imunofarmacologia, Departamento de Fisiologia e Farmacodinâmica, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil; and Department of Medicine, Harvard Medical School, Boston, Massachusetts
Correspondence and requests for reprints should be addressed to Patrícia Torres Bozza, Laboratorio de Imunofarmacologia, Departamento de Fisiologia e Farmacodinâmica, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz; Av. Brasil 4365, Manguinhos 21045-900 Rio de Janeiro, RJ Brazil. E-mail: pbozza{at}ioc.fiocruz.br
Eosinophils are an important source of leukotriene (LT)C4, which can be synthesized within lipid bodiescytoplasmic organelles where eicosanoid formation may take place. Allergy-driven lipid body formation and function have never been investigated. Here, we studied the in vivo induction and role of lipid bodies within eosinophils recruited to sites of allergic inflammation. Using two murine models of allergic inflammation (asthma and pleurisy), we verified that parallel to the eosinophil influx, allergic challenge also induced lipid body formation within recruited eosinophils. Neutralizing antibodies to eotaxin/CCL11, RANTES/CCL5, or CCR3 partially inhibited lipid body formation within recruited eosinophils in the allergic pleurisy model. Likewise, intrapleural administration of RANTES or eotaxin also induced significant influx of eosinophils loaded with lipid bodies. By immunolabeling, we detected the presence of a key enzyme involved in the leukotriene metabolism5-lipoxygenasewithin eosinophil lipid bodies formed in vivo after allergen challenge. Furthermore, specific immunolocalization of newly formed LTC4 demonstrated that lipid bodies were the sites of formation of this eicosanoid within infiltrating eosinophils. Therefore, allergic inflammation triggers in vivo formation of new lipid bodies within infiltrating eosinophils, a phenomenon largely mediated by eotaxin/RANTES acting via CCR3 receptors. Such in vivo allergen-driven lipid bodies function as intracellular compartments of LTC4 synthesis.
Key Words: allergy CCR3 eosinophils lipid bodies LTC4
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