Loss of Anti-Tumor Efficacy by Polyamine Blocking Therapy in GCN2 Null Mice.
Loss of Anti-Tumor Efficacy by Polyamine Blocking Therapy in GCN2 Null Mice.
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DOI:
10.3390/biomedicines11102703
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发表时间:
2023-10-05
期刊:
影响因子:
4.7
通讯作者:
中科院分区:
文献类型:
--
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GCN2 is one of the main sensors of amino acid starvation stress, and its activation in the stressful tumor microenvironment plays a crucial role in tumor survival and progression. We hypothesized that elevated polyamine biosynthesis and subsequent depletion of precursor arginine activates GCN2, thus rewiring metabolism to support tumor cell survival and drive myeloid immunosuppressive function. We sought to determine if the anti-tumor efficacy of a polyamine blocking therapy (PBT) may be mediated by its effect on GCN2. Unlike wild-type mice, PBT treatment in GCN2 knockout mice bearing syngeneic B16.F10 or EG7 tumors resulted in no tumor growth inhibition and no changes in the profile of infiltrating tumor immune cells. Studies with murine bone marrow cell cultures showed that increased polyamine metabolism and subsequent arginine depletion and GCN2 activation played an essential role in the generation and cytoprotective autophagy of myeloid derived suppressor cells (MDSCs) as well as the M2 polarization and survival of macrophages, all of which were inhibited by PBT. In all, our data suggest that polyamine-dependent GCN2 signaling in stromal cells promotes tumor growth and the development of the immunosuppressive tumor microenvironment, and that the PBT anti-tumor effect is mediated, at least in part, by targeting GCN2.
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影响因子:
--
作者:
Alexander ET;Minton A;Peters MC;Phanstiel O 4th;Gilmour SK
通讯作者:
Gilmour SK
DOI:
10.1016/s0006-291x(88)80042-1
发表时间:
1988-11-30
影响因子:
3.1
作者:
CHANG, BK;LIBBY, PR;PORTER, CW
通讯作者:
PORTER, CW
影响因子:
24.8
作者:
Halaby, Marie Jo;Hezaveh, Kebria;McGaha, Tracy L.
通讯作者:
McGaha, Tracy L.
影响因子:
5.6
作者:
Ngabire D;Kim GD
通讯作者:
Kim GD
DOI:
10.1038/s41568-018-0050-3
发表时间:
2018-11
期刊:
Nature reviews. Cancer
影响因子:
--
作者:
Casero RA Jr;Murray Stewart T;Pegg AE
通讯作者:
Pegg AE