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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunother+Cancer
2015 ; 3
(ä): 53
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Tasquinimod triggers an early change in the polarization of tumor associated
macrophages in the tumor microenvironment
#MMPMID26673090
Olsson A
; Nakhlé J
; Sundstedt A
; Plas P
; Bauchet AL
; Pierron V
; Bruetschy L
; Deronic A
; Törngren M
; Liberg D
; Schmidlin F
; Leanderson T
J Immunother Cancer
2015[]; 3
(ä): 53
PMID26673090
show ga
BACKGROUND: Tasquinimod (a quinoline-3-carboxyamide) is a small molecule
immunotherapy with demonstrated effects on the tumor microenvironment (TME)
involving immunomodulation, anti-angiogenesis and inhibition of metastasis. A
target molecule of tasquinimod is the inflammatory protein S100A9 which has been
shown to affect the accumulation and function of suppressive myeloid cell subsets
in tumors. Given the major impact of myeloid cells to the tumor microenvironment,
manipulation of this cell compartment is a desirable goal in cancer therapeutics.
METHODS: To understand the consequences of tasquinimod treatment on the TME, we
evaluated early treatment effects in tumor infiltrating myeloid cells. Cellular
phenotypes were studied by flow cytometry while gene expression both in tumor
tissue and in isolated CD11b(+) cells or tumor cells were measured by real
time-PCR. Effects on angiogenesis were monitored by changes in CD31 levels and by
gene expression in tumor tissue. Effects on cytokine levels in tumor tissue and
serum were determined by multiplex analysis. RESULTS: The MC38-C215 colon
carcinoma tumors showed a substantial infiltration of primarily myeloid cells
that were dominated by Ly6C(low)F4/80(+)CD206(+) M2-polarized tumor associated
macrophages (TAMs), an immuno-suppressive and pro-angiogenic cell population.
Here, we show that tasquinimod treatment induces an anti-tumor effect which is
subsequent to a reduction in tumor infiltrating CD206(+) M2 macrophages and a
simultaneous increase in M1 macrophages expressing MHC class II and CD86. The
tasquinimod-induced changes in TAM polarization were evident within 24 h of
exposure, emphasizing the ability of tasquinimod to rapidly reprogram the tumor
microenvironment. This change in the tumor associated myeloid compartment
preceded an increased IL12-production within the tumor and a decrease in tumor
neovascularization. The switch in TAM polarization by tasquinimod was confirmed
in the 4T1 breast cancer model where tasquinimod also reduce lung metastasis
development. CONCLUSION: Our data show that tasquinimod affects tumor
infiltrating myeloid cells early after exposure, leading to a change in phenotype
from pro-angiogenic and immunosuppressive M2-like TAMs to pro-inflammatory
M1-like macrophages. These changes are consistent with the effects of tasquinimod
seen on tumor vascularization, immune suppression and metastasis giving further
insights to the anti-tumor mechanism of action of tasquinimod.