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2015 ; 12
(11
): 1902-14
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TNF Counterbalances the Emergence of M2 Tumor Macrophages
#MMPMID26365184
Kratochvill F
; Neale G
; Haverkamp JM
; Van de Velde LA
; Smith AM
; Kawauchi D
; McEvoy J
; Roussel MF
; Dyer MA
; Qualls JE
; Murray PJ
Cell Rep
2015[Sep]; 12
(11
): 1902-14
PMID26365184
show ga
Cancer can involve non-resolving, persistent inflammation where varying numbers
of tumor-associated macrophages (TAMs) infiltrate and adopt different activation
states between anti-tumor M1 and pro-tumor M2 phenotypes. Here, we resolve a
cascade causing differential macrophage phenotypes in the tumor microenvironment.
Reduction in TNF mRNA production or loss of type I TNF receptor signaling
resulted in a striking pattern of enhanced M2 mRNA expression. M2 gene expression
was driven in part by IL-13 from eosinophils co-recruited with inflammatory
monocytes, a pathway that was suppressed by TNF. Our data define regulatory nodes
within the tumor microenvironment that balance M1 and M2 populations. Our results
show macrophage polarization in cancer is dynamic and dependent on the balance
between TNF and IL-13, thus providing a strategy for manipulating TAMs.