IFN-γ producing T cells contribute to the increase of myeloid derived suppressor cells in tumor-bearing mice after cyclophosphamide treatment.

Abstract:

:It has been reported that treatment with cyclophosphamide (CTX) as a chemotherapeutic drug in cancer patients or tumor-bearing mice can result in an increase in the proportion of myeloid derived suppressor cells (MDSCs) in blood and lymphoid organs. Here we sought to clarify the possible mechanism of this unwanted increase in proportion of MDSCs in tumor-bearing mice after CTX treatment. We found that both CD4(+) T cells and CD8(+) T cells underwent an expansion and activation before the increase of MDSCs in the early period of CTX treatment in 4T1 breast tumor-bearing mice. The proportion of MDSCs in nude mice lacking T cells after CTX therapy was comparable to that in nude mice without CTX treatment. T cell transfer to 4T1-bearing nude mice enhanced the proportion of MDSCs in tumor-bearing mice after CTX therapy. The co-culture of MDSCs and T cells in vitro also showed that CD4(+) T cells and CD8(+) T cells could facilitate the expansion and survival of MDSCs, and this effect was mediated by IFN-γ released by T cells. These results gave an explanation of the unwanted consequence resulted from CTX treatment in tumor-bearing mice. It also provided some insights into the strategies for eliminating the bad side of CTX treatment and to make it more effective in cancer therapy.

journal_name

Int Immunopharmacol

authors

Guo Q,Lv Z,Fu Q,Jiang C,Liu Y,Lai L,Chen Q,Shen J,Wang Q

doi

10.1016/j.intimp.2011.12.016

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

425-32

issue

2

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(11)00478-4

journal_volume

12

pub_type

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