4.8 Article

Protein C receptor is a therapeutic stem cell target in a distinct group of breast cancers

期刊

CELL RESEARCH
卷 29, 期 10, 页码 832-845

出版社

NATURE PUBLISHING GROUP
DOI: 10.1038/s41422-019-0225-9

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资金

  1. National Natural Science Foundation of China [31830056, 31861163006, 31625020, 31530045, 31661143043, 81874113, 81672601, 81872137]
  2. Chinese Academy of Sciences [XDA12020378, XDB19000000]
  3. Shanghai Municipal Science and Technology Commission [17XD1404000]
  4. National Ten Thousand Talents Program

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Breast cancer is a heterogeneous disease. In particular, triple-negative breast cancer (TNBC) comprises various molecular subgroups with unclear identities and currently has few targeted treatment options. Our previous study identified protein C receptor (Procr) as a surface marker on mammary stem cells (MaSCs) located in the basal layer of the normal mammary gland. Given the possible connection of TNBC with basal layer stem cells, we conducted comparative analyses of Procr in breast cancers of mouse and human origin. In mouse mammary tumors, we showed that Procr(+) cells are enriched for cancer stem cells (CSCs) in Wntl basal-like tumors, but not in Brcal basal-like tumors or PyVT luminal tumors. In human cancers, PROCR was robustly expressed in half of TNBC cases. Experiments with patient-derived xenografts (PDXs) revealed that PROCR marks CSCs in this discrete subgroup (referred to as PROCR+ TNBC). Interfering with the function of PROCR using an inhibitory nanobody reduced the CSC numbers, arrested tumor growth and prevented rapid tumor recurrence. Our data suggest a key role of MaSC in breast tumorigenesis. Moreover, our work indicates that PROCR can be used as a biomarker to stratify TNBC into clinically relevant subgroups and may provide a novel targeted treatment strategy for this clinically important tumor subtype.

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