title: Murine macrophages cultured with IL-4 acquire a phenotype similar to that of epithelioid cells from granulomatous inflammation.
abstract: Epithelioid cells (ECs) found in granulomas are thought to derive from mononuclear phagocytes. Although GM-CSF and/or IL-4 are known to promote cell differentiation their role in the development of ECs has never been demonstrated. Here we showed that mouse macrophages treated exclusively with recombinant IL-4 (rIL-4) differentiate into epithelioid-like cells. Macrophages cultivated with rIL-4 presented a fried-egg shape, and ultrastructural studies revealed membrane interdigitations, cytoplasmic vesicles, prominent Golgi complex, and rough endoplasmic reticulum. Compared with controls, rIL-4 treated cells displayed increased expression of MHC class II molecules and of Migration Inhibitory Factor-Related Protein-14. Whereas mannose receptor-mediated phagocytosis was increased, Fcgamma-receptor mediated phagocytosis and the production of nitric oxide were decreased in treated cultures. All these features overlap those reported for ECs from granulomatous lesions. In conclusion, treatment of mouse peritoneal macrophages with rIL-4 drives their in vitro differentiation to an epithelioid phenotype and provides a tool to investigate the biology of ECs.
authors.affiliation: Department of Microbiology, Immunology and Parasitology, Federal University of São Paulo, São Paulo, Brazil.
authors.forename: Ivone Martins
authors.initials: IM
authors.lastname: Cipriano
authors.forename: Mario
authors.initials: M
authors.lastname: Mariano
authors.forename: Edna
authors.initials: E
authors.lastname: Freymüller
authors.forename: Celia Regina Whitaker
authors.initials: CR
authors.lastname: Carneiro
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D015622:Epithelioid Cells / Q000276:immunology* / Q000378:metabolism / Q000473:pathology / Q000648:ultrastructure; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D015745:Granuloma, Foreign-Body / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D016130:Immunophenotyping; D015847:Interleukin-4 / Q000494:pharmacology*; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism / Q000473:pathology / Q000648:ultrastructure; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010587:Phagocytosis / Q000276:immunology; D011994:Recombinant Proteins / Q000494:pharmacology
chemical_list: D011994:Recombinant Proteins; D015847:Interleukin-4; D016178:Granulocyte-Macrophage Colony-Stimulating Factor