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2018 ; 10
(432
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Obesity promotes resistance to anti-VEGF therapy in breast cancer by
up-regulating IL-6 and potentially FGF-2
#MMPMID29540614
Incio J
; Ligibel JA
; McManus DT
; Suboj P
; Jung K
; Kawaguchi K
; Pinter M
; Babykutty S
; Chin SM
; Vardam TD
; Huang Y
; Rahbari NN
; Roberge S
; Wang D
; Gomes-Santos IL
; Puchner SB
; Schlett CL
; Hoffmman U
; Ancukiewicz M
; Tolaney SM
; Krop IE
; Duda DG
; Boucher Y
; Fukumura D
; Jain RK
Sci Transl Med
2018[Mar]; 10
(432
): ä PMID29540614
show ga
Anti-vascular endothelial growth factor (VEGF) therapy has failed to improve
survival in patients with breast cancer (BC). Potential mechanisms of resistance
to anti-VEGF therapy include the up-regulation of alternative angiogenic and
proinflammatory factors. Obesity is associated with hypoxic adipose tissues,
including those in the breast, resulting in increased production of some of the
aforementioned factors. Hence, we hypothesized that obesity could contribute to
anti-VEGF therapy's lack of efficacy. We found that BC patients with obesity
harbored increased systemic concentrations of interleukin-6 (IL-6) and/or
fibroblast growth factor 2 (FGF-2), and their tumor vasculature was less
sensitive to anti-VEGF treatment. Mouse models revealed that obesity impairs the
effects of anti-VEGF on angiogenesis, tumor growth, and metastasis. In one murine
BC model, obesity was associated with increased IL-6 production from adipocytes
and myeloid cells within tumors. IL-6 blockade abrogated the obesity-induced
resistance to anti-VEGF therapy in primary and metastatic sites by directly
affecting tumor cell proliferation, normalizing tumor vasculature, alleviating
hypoxia, and reducing immunosuppression. Similarly, in a second mouse model,
where obesity was associated with increased FGF-2, normalization of FGF-2
expression by metformin or specific FGF receptor inhibition decreased vessel
density and restored tumor sensitivity to anti-VEGF therapy in obese mice.
Collectively, our data indicate that obesity fuels BC resistance to anti-VEGF
therapy via the production of inflammatory and angiogenic factors.