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2015 ; 10
(3
): e0121720
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Sustained endothelial expression of HoxA5 in vivo impairs pathological
angiogenesis and tumor progression
#MMPMID25821967
Cuevas I
; Layman H
; Coussens L
; Boudreau N
PLoS One
2015[]; 10
(3
): e0121720
PMID25821967
show ga
HoxA5 is expressed in quiescent endothelial cells (EC), but absent in activated
angiogenic EC. To examine the efficacy of targeting HoxA5 therapeutically to
quell pathologic or tumor angiogenesis, we generated an inducible, transgenic
mouse model of sustained HoxA5 expression in ECs. During pathologic angiogenesis,
sustained HoxA5 regulates expression several angiogenic effector molecules,
notably increased expression of TSP-2 and reduced expression of VEGF, thus
leading to inhibition of pathological angiogenesis in tissues. To evaluate if
this impressive reduction of vascularization could also impact tumor
angiogenesis, HoxA5 mice were bred with a mouse model of de novo squamous
carcinogenesis, e.g., K14-HPV16 mice. Activation of EC-HoxA5 significantly
reduced infiltration by mast cells into neoplastic skin, an early hallmark of
progression to dysplasia, reduced angiogenic vasculature, and blunted
characteristics of tumor progression. To evaluate HoxA5 as a therapeutic, topical
application of a HoxA5 transgene onto early neoplastic skin of K14-HPV16 mice
similarly resulted in a significant impairment of angiogenic vasculature and
progression to dysplasia to a similar extent as observed with genetic delivery of
HoxA5. Together these data indicate that HoxA5 represents a novel molecule for
restricting pathological and tumorigenic angiogenesis.