Interferon regulatory factor-8 modulates the development of tumour-induced CD11b +Gr-1 + myeloid cells

Trina J. Stewart, Kristy M. Greeneltch, Julia E. Reid, David J. Liewehr, Seth M. Steinberg, Kebin Liu, Scott I. Abrams

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Tumour-induced myeloid-derived suppressor cells (MDSC) promote immune suppression and mediate tumour progression. However, the molecular basis for the generation of MDSC, which in mice co-express the CD11b + and Gr-1 + cell surface markers remains unclear. Because CD11b +Gr-1 + cells expand during progressive tumour growth, this suggests that tumour-induced events alter signalling pathways that affect normal myeloid cell development. Interferon regulatory factor-8 (IRF-8), a member of the IFN-γ regulatory factor family, is essential for normal myelopoiesis. We therefore examined whether IRF-8 modulated tumour-induced CD11b +Gr-1 + cell development or accumulation using both implantable (4T1) and transgenic (MMTV-PyMT) mouse models of mammary tumour growth. In the 4T1 model, both splenic and bone marrow-derived CD11b +Gr-1 + cells of tumour-bearing mice displayed a marked reduction in IRF-8 expression compared to control populations. A causal link between IRF-8 expression and the emergence of tumour-induced CD11b +Gr-1 + cells was explored in vivo using a double transgenic (dTg) mouse model designed to express transgenes for both IRF-8 and mammary carcinoma development. Despite the fact that tumour growth was unaffected, splenomegaly, as well as the frequencies and absolute numbers of CD11b +Gr-1 + cells were significantly lower in dTg mice when compared with single transgenic tumour-bearing mice. Overall, these data reveal that IRF-8 plays an important role in tumour-induced development and/or accumulation of CD11b +Gr-1 + cells, and establishes a molecular basis for the potential manipulation of these myeloid populations for cancer therapy. No claim to original US Government work Journal compilation

Original languageEnglish (US)
Pages (from-to)3939-3950
Number of pages12
JournalJournal of Cellular and Molecular Medicine
Volume13
Issue number9 B
DOIs
StatePublished - Sep 1 2009

Fingerprint

Myeloid Cells
Neoplasms
Transgenic Mice
interferon regulatory factor-8
Growth
Myelopoiesis
Breast Neoplasms
Splenomegaly
Transgenes
Population
Bone Marrow

Keywords

  • Haematopoiesis
  • IRF-8
  • Myeloid-derived suppressor cells
  • Tumour progression

ASJC Scopus subject areas

  • Molecular Medicine
  • Cell Biology

Cite this

Interferon regulatory factor-8 modulates the development of tumour-induced CD11b +Gr-1 + myeloid cells. / Stewart, Trina J.; Greeneltch, Kristy M.; Reid, Julia E.; Liewehr, David J.; Steinberg, Seth M.; Liu, Kebin; Abrams, Scott I.

In: Journal of Cellular and Molecular Medicine, Vol. 13, No. 9 B, 01.09.2009, p. 3939-3950.

Research output: Contribution to journalArticle

Stewart, Trina J. ; Greeneltch, Kristy M. ; Reid, Julia E. ; Liewehr, David J. ; Steinberg, Seth M. ; Liu, Kebin ; Abrams, Scott I. / Interferon regulatory factor-8 modulates the development of tumour-induced CD11b +Gr-1 + myeloid cells. In: Journal of Cellular and Molecular Medicine. 2009 ; Vol. 13, No. 9 B. pp. 3939-3950.
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