Accessory cell function of human eosinophils. HLA-DR-dependent, MHC-restricted antigen-presentation and IL-1 alpha expression.

Although peripheral blood eosinophils express little of the class II MHC protein, HLA-DR, eosinophils could be induced to express HLA-DR by exposures to cytokines, including granulocyte-macrophage-CSF, IL-4, and IFN-gamma, with granulocyte-macrophage-CSF eliciting the greatest level of HLA-DR expression as assessed by flow cytometry. The capacity of HLA-DR+ eosinophils to function as APC was evaluated with blood eosinophils isolated free of mononuclear cells, cultured with granulocyte-macrophage-CSF to induce HLA-DR expression and then exposed to the Ag tetanus toxoid. HLA-DR+ eosinophils fixed with paraformaldehyde after Ag exposure stimulated T cell proliferation, whereas HLA-DR+ eosinophils fixed with paraformaldehyde before Ag exposure failed to stimulate lymphocyte proliferation. The lymphocyte proliferative responses elicited by Ag-pulsed HLA-DR+ eosinophils were inhibited by anti-HLA-DR mAb and were restricted to HLA-DR compatible lymphocytes. Moreover, eosinophils from a hypereosinophilic donor, both before and more prominently after stimulation with PMA, contained transcripts for IL-1-alpha mRNA detectable by Northern blot hybridization and in situ hybridization and expressed IL-1-alpha protein detectable by immunohistochemistry. These findings indicate that human eosinophils can process Ag, express the costimulatory cytokine IL-1-alpha, and after cytokine-elicited induction of HLA-DR expression can function as HLA-DR-dependent, MHC-restricted APC in stimulating T lymphocyte responses.

• Publication year

  1993

• Venue

  Journal of Immunology

• Publication date

  1993-03-15

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.4049/jimmunol.150.6.2554PMID 8450230
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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