Abstract:
:Myeloid derived suppressor cells (MDSC) are a heterogeneous group of immature cells that accumulate in the peripheral blood and tumor microenvironment and are barriers to cancer therapy. MDSCs serve as prognostic biomarkers and are targets for therapy. On the basis of surface markers, three subsets of MDSCs have been defined in humans: granulocytic, monocytic, and early stage (e-MDSC). The markers attributed to e-MDSCs overlap with those of basophils, which are rare circulating myeloid cells with unrecognized roles in cancer. Thus, we asked whether e-MDSCs in circulation and the tumor microenvironment include basophils. On average, 58% of cells with e-MDSC surface markers in blood and 36% in ascites from patients with ovarian cancer were basophils based on CD123high expression and cytology, whereas cells with immature features were rare. Circulating and ascites basophils did not suppress proliferation of stimulated T cells, a key feature of MDSCs. Increased accumulation of basophils and basogranulin, a marker of basophil degranulation, were observed in ascites compared to serum in patients with newly diagnosed ovarian cancer. Basophils recruited to the tumor microenvironment may exacerbate fluid accumulation by their release of proinflammatory granular constituents that promote vascular leakage. No significant correlation was observed between peripheral basophil counts and survival in patients with ovarian cancer. Our results suggest that studies in which e-MDSCs were defined solely by surface markers should be reevaluated to exclude basophils. Both immaturity and suppression are criteria to define e-MDSCs in future studies.
journal_name
Cancer Immunol Resjournal_title
Cancer immunology researchauthors
Khan ANH,Emmons TR,Wong JT,Alqassim E,Singel KL,Mark J,Smith BE,Tario JD,Eng KH,Moysich KB,Odunsi K,Abrams SI,Segal BHdoi
10.1158/2326-6066.CIR-19-0556subject
Has Abstractpub_date
2020-06-01 00:00:00pages
819-828issue
6eissn
2326-6066issn
2326-6074pii
2326-6066.CIR-19-0556journal_volume
8pub_type
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journal_title:Cancer immunology research
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journal_title:Cancer immunology research
pub_type: 杂志文章
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