Abstract:
:One of the obstacles for cancer immunotherapy is the inefficiency of CD8(+) T-cell recruitment to tumors. STAT3 has been shown to suppress CD8(+) T-cell antitumor functions in various cancer models, in part by restricting accumulation of CD8(+) T cells. However, the underlying molecular mechanism by which STAT3 in CD8(+) T cells inhibits their accumulation in tumors remains to be defined. Here, we show that STAT3 signaling in CD8(+) T cells inhibits chemokine CXCL10 production by tumor-associated myeloid cells by reducing IFNγ expression by T cells. We further demonstrate that ablating STAT3 in T cells allows expression of CXCR3, the receptor of CXCL10, on CD8(+) T cells, resulting in efficient accumulation of CD8(+) T cells at tumor sites. Blocking IFNγ or CXCR3 impairs the accumulation of STAT3-deficient CD8(+) T cells in tumor and their antitumor effects. Together, our study reveals a negative regulation by STAT3 signaling in T cells on cross-talk between myeloid cells and T cells through IFNγ/CXCR3/CXCL10, which is important for CD8(+) T cells homing to tumors. Our results thus provide new insights applicable to cancer immunotherapy and adoptive T-cell strategies.
journal_name
Cancer Immunol Resjournal_title
Cancer immunology researchauthors
Yue C,Shen S,Deng J,Priceman SJ,Li W,Huang A,Yu Hdoi
10.1158/2326-6066.CIR-15-0014subject
Has Abstractpub_date
2015-08-01 00:00:00pages
864-870issue
8eissn
2326-6066issn
2326-6074journal_volume
3pub_type
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