Vascular endothelial growth factors (VEGFs) are
known as key regulators of permeability and binding to
their receptors trigger an increase in vascular permeability
[16]. Upregulation and downregulation of VEGF expression
contributes to abnormal angiogenesis indirectly
leading to vascular hyperpermeability [17]. Furthermore,
overproduction of VEGF also contributes to progression
to other diseases such as coronary disease [18] and
cancer [19]. Ghosh and colleagues [20] demonstrated
that histamine enhanced the production of VEGF during
acute inflammation. VEGF release and its abovementioned
effects on vascular permeability and cellular
infiltration could contribute to edema formation. Thus,
it is very important to regulate VEGF production in cells
either by suppression when it is overproduced or vice
versa. Our results showed that the oral administration of
AEBO in rats decreased the histamine-induced VEGF
production, indicating that AEBO may have the potential
to regulate vascular permeability by monitoring the
expression of VEGF.