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2016 ; 7
(44
): 71594-71607
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In vivo phage display screening for tumor vascular targets in glioblastoma
identifies a llama nanobody against dynactin-1-p150Glued
#MMPMID27689404
van Lith SA
; Roodink I
; Verhoeff JJ
; Mäkinen PI
; Lappalainen JP
; Ylä-Herttuala S
; Raats J
; van Wijk E
; Roepman R
; Letteboer SJ
; Verrijp K
; Leenders WP
Oncotarget
2016[Nov]; 7
(44
): 71594-71607
PMID27689404
show ga
Diffuse gliomas are primary brain cancers that are characterised by infiltrative
growth. Whereas high-grade glioma characteristically presents with perinecrotic
neovascularisation, large tumor areas thrive on pre-existent vasculature as well.
Clinical studies have revealed that pharmacological inhibition of the angiogenic
process does not improve survival of glioblastoma patients. Direct targeting of
tumor vessels may however still be an interesting therapeutic approach as it
allows pinching off the blood supply to tumor cells. Such tumor vessel targeting
requires the identification of tumor-specific vascular targeting agents
(TVTAs).Here we describe a novel TVTA, C-C7, which we identified via in vivo
biopanning of a llama nanobody phage display library in an orthotopic mouse model
of diffuse glioma. We show that C-C7 recognizes a subpopulation of tumor blood
vessels in glioma xenografts and clinical glioma samples. Additionally, C-C7
recognizes macrophages and activated endothelial cells in atherosclerotic
lesions. By using C-C7 as bait in yeast-2-hybrid (Y2H) screens we identified
dynactin-1-p150Glued as its binding partner. The interaction was confirmed by
co-immunostainings with C-C7 and a commercial anti-dynactin-1-p150Glued antibody,
and via co-immunoprecipitation/western blot studies. Normal brain vessels do not
express dynactin-1-p150Glued and its expression is reduced under anti-VEGF
therapy, suggesting that dynactin-1-p150Glued is a marker for activated
endothelial cells.In conclusion, we show that in vivo phage display combined with
Y2H screenings provides a powerful approach to identify tumor-targeting
nanobodies and their binding partners. Using this combination of methods we
identify dynactin-1-p150Glued as a novel targetable protein on activated
endothelial cells and macrophages.