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Myeloid ERK5 deficiency suppresses tumor growth by blocking protumor macrophage polarization via STAT3 inhibition #MMPMID29507229
Giurisato E; Xu Q; Lonardi S; Telfer B; Russo I; Pearson A; Finegan KG; Wang W; Wang J; Gray NS; Vermi W; Xia Z; Tournier C
Proc Natl Acad Sci U S A 2018[Mar]; 115 (12): E2801-10 PMID29507229show ga
Macrophages can be functionally reprogrammed by the tumor microenvironment to further tumor growth and malignancy. In this study, we have discovered that this pathological process is dependent on the ERK5 MAPK. Accordingly, we demonstrated that inactivation of ERK5 in macrophages blocked the phosphorylation of STAT3, a transcription factor crucial for determining macrophage polarity, and impaired the growth of melanoma and carcinoma grafts. These results raise the possibility that targeting protumor macrophages via anti-ERK5 therapy constitutes a very attractive strategy for cancer treatment. This is important given that the detection of large numbers of macrophages in human tumors often correlates with poor prognosis, but also with a poor response of the tumor to anticancer agents.