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2015 ; 282
(8
): 1458-1467
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Simultaneous in vivo imaging of blood and lymphatic vessel growth in
Prox1-GFP/Flk1::myr-mCherry mice
#MMPMID25688651
Zhu J
; Dugas-Ford J
; Chang M
; Purta P
; Han KY
; Hong YK
; Dickinson ME
; Rosenblatt MI
; Chang JH
; Azar DT
FEBS J
2015[Apr]; 282
(8
): 1458-1467
PMID25688651
show ga
The ability to visually observe angiogenesis and lymphangiogenesis simultaneously
and repeatedly in living animals would greatly enhance our understanding of the
inter-dependence of these processes. To generate a mouse model that allows such
visualization via in vivo fluorescence imaging, we crossed Prox1-GFP mice with
Flk1::myr-mCherry mice to generate Prox1-GFP/Flk1::myr-mCherry mice, in which
lymphatic vessels emit green fluorescence and blood vessels emit red
fluorescence. Corneal neovascularization was induced in these mice using three
injury models: implantation of a vascular endothelial growth factor (VEGF)
pellet, implantation of a basic fibroblast growth factor (bFGF) pellet, and
alkali burn injury. Vessel growth was observed in vivo by stereomicroscopy on
days 0, 3, 7 and 10 after pellet implantation or alkali injury as well as in
flat-mounted corneas via confocal microscopy after the final in vivo imaging time
point. We observed blood and lymphatic vessel growth in all three models, with
the most significant growth occurring from days 0-7. Upon VEGF stimulation, the
growth kinetics of blood and lymphatic vessels were similar. Blood vessels
exhibited similar growth patterns in VEGF- and bFGF-stimulated corneas. Alkali
burn injury induced robust angiogenesis and lymphangiogenesis. The intrinsic
fluorescence of blood and lymphatic endothelial cells in
Prox1-GFP/Flk1::myr-mCherry mice permitted simultaneous in vivo imaging of
angiogenesis and lymphangiogenesis. This allowed us to differentiate the
processes as well as observe their inter-dependence, and will be valuable in
development of therapies targeting angiogenesis and/or lymphangiogenesis.