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2016 ; 16
(ä): 343
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L-Arginine supplementation inhibits the growth of breast cancer by enhancing
innate and adaptive immune responses mediated by suppression of MDSCs in vivo
#MMPMID27246354
Cao Y
; Feng Y
; Zhang Y
; Zhu X
; Jin F
BMC Cancer
2016[Jun]; 16
(ä): 343
PMID27246354
show ga
BACKGROUND: L-Arg is involved in many biological activities, including the
activation of T cells. In breast cancer patients, L-Arg is depleted by nitric
oxide synthase 2 (NOS2) and arginase 1 (ARG-1) produced by myeloid-derived
suppressor cells (MDSCs). Our aim was to test whether L-Arg supplementation could
enhance antitumor immune response and improve survivorship in a rodent model of
mammary tumor. METHODS: Tumor volumes in control and L-Arg treated 4 T1 tumor
bearing (TB) BALB/c mice were measured and survival rates were recorded. The
percentages of MDSCs, dendritic cells (DCs), regulatory T cells (Tregs),
macrophages, CD4(+) T cells, and CD8(+) T cells were examined by flow cytometry.
Additionally, levels of IL-10, TNF-?, and IFN-? were measured by enzyme-linked
immunosorbent assay (ELISA) and nitric oxide (NO) levels were measured by the
Griess reaction. IFN-?, T-bet, Granzyme B, ARG-1 and iNOS mRNA levels were
examined by real-time RT-PCR. RESULTS: L-Arg treatment inhibited tumor growth and
prolonged the survival time of 4 T1 TB mice. The frequency of MDSCs was
significantly suppressed in L-Arg treated TB mice. In contrast, the numbers and
function of macrophages, CD4(+) T cells, and CD8(+) T cells were significantly
enhanced. The IFN-?, TNF-?, NO levels in splenocytes supernatant, as well as
iNOS, IFN-?, Granzyme B mRNA levels in splenocytes and tumor blocks were
significantly increased. The ARG-1 mRNA level in tumor blocks, the frequency of
Tregs, and IL-10 level were not affected. CONCLUSION: L-Arg supplementation
significantly inhibited tumor growth and prolonged the survival time of 4 T1 TB
mice, which was associated with the reduction of MDSCs, and enhanced innate and
adaptive immune responses.