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Primary tumor-induced immunity eradicates disseminated tumor cells in syngeneic mouse model
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Journal Article
Primary tumor-induced immunity eradicates disseminated tumor cells in syngeneic mouse model
2019
Overview
Although clinically apparent metastasis is associated with late stages of cancer development, micro-metastatic dissemination may be an early event. However, the fate of these early disseminated tumor cells (DTC) remains elusive. We show that despite their capacity to disseminate into secondary organs, 4T1 tumor models develop overt metastasis while EMT6-tumor bearing mice clear DTCs shed from primary tumors as well as those introduced by intravenous (IV) injection. Following the surgical resection of primary EMT6 tumors, mice do not develop detectable metastasis and reject IV-injected tumor cells. In contrast, these cells readily grow and metastasize in immuno-deficient athymic or Rag2
−/−
mice, an effect mimicked by CD8
+
T-cell depletion in immunocompetent mice. Furthermore, recombinant G-CSF or adoptive transfer of granulocytic-MDSCs isolated from 4T1 tumor-bearing mice, induce metastasis by suppressing CD8
+
T-cells in EMT6-primed mice. Our studies support the concept of immune surveillance providing molecular insights into the immune mechanisms during tumor progression.
Dissemination of tumor cells from the primary site is an early event. Here, the authors show that the early disseminated tumor cells are actively cleared by the host cytotoxic T lymphocytes induced by the primary tumor and that infiltration of granulocytic myeloid-derived suppressor cells counteracts such immune protection and allow metastasis development.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 13/2
/ 13/31
/ 13/51
/ 14
/ 14/5
/ 14/63
/ 45/61
/ 59
/ 64
/ Animals
/ Bearing
/ Cancer
/ CD8-Positive T-Lymphocytes - immunology
/ Granulocyte colony-stimulating factor
/ Humanities and Social Sciences
/ Humans
/ Immunity
/ Lymphocyte Subsets - immunology
/ Mice
/ Organs
/ Science
/ Triple Negative Breast Neoplasms - genetics
/ Triple Negative Breast Neoplasms - immunology
/ Triple Negative Breast Neoplasms - surgery
/ Tumors
