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Data from Breast Cancer Cell Uptake of the Inflammatory Mediator Neutrophil Elastase Triggers an Anticancer Adaptive Immune Response

Posted on 2023-03-30 - 21:02
Abstract

There is little understanding of the impact of tumor-associated neutrophils (TAN) on adaptive immunity to tumors. In this study, we report the results of an investigation of the pathobiologic basis for the prognostic significance of neutrophil elastase, a serine protease found in neutrophil granules, in a model of cyclin E (CCNE)–overexpressing breast cancer. We established that neutrophil elastase was expressed by TAN within breast cancer tissues but not by breast cancer cells. Neutrophil elastase modulated killing of breast cancer cells by CTLs specific for CCNE-derived HLA-A2–restricted peptide (ILLDWLMEV). Breast cancer cells exhibited striking antigen-specific uptake of neutrophil elastase from the microenvironment that was independent of neutrophil elastase enzymatic activity. Furthermore, neutrophil elastase uptake increased expression of low molecular weight forms of CCNE and enhanced susceptibility to peptide-specific CTL lysis, suggesting that CCNE peptides are naturally presented on breast cancer cells. Taken together, our findings reveal a previously unknown mechanism of antitumor adaptive immunity that links cancer cell uptake of an inflammatory mediator to an effective cytolytic response against an important breast cancer antigen. Cancer Res; 72(13); 3153–62. ©2012 AACR.

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Cancer Research

AUTHORS (13)

  • Elizabeth A. Mittendorf
    Gheath Alatrash
    Na Qiao
    Yun Wu
    Pariya Sukhumalchandra
    Lisa S. St. John
    Anne V. Philips
    Haile Xiao
    Mao Zhang
    Kathryn Ruisaard
    Karen Clise-Dwyer
    Sijie Lu
    Jeffrey J. Molldrem
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