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2016 ; 6
(ä): 33495
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Lack of adrenomedullin in mouse endothelial cells results in defective
angiogenesis, enhanced vascular permeability, less metastasis, and more brain
damage
#MMPMID27640364
Ochoa-Callejero L
; Pozo-Rodrigálvarez A
; Martínez-Murillo R
; Martínez A
Sci Rep
2016[Sep]; 6
(ä): 33495
PMID27640364
show ga
Adrenomedullin (AM) is a vasodilating peptide involved in the regulation of
circulatory homeostasis and in the pathophysiology of certain cardiovascular
diseases. AM plays critical roles in blood vessels, including regulation of
vascular stability and permeability. To elucidate the autocrine/paracrine
function of AM in endothelial cells (EC) in vivo, a conditional knockout of AM in
EC (AM(EC-KO)) was used. The amount of vascularization of the matrigel implants
was lower in AM(EC-KO) mice indicating a defective angiogenesis. Moreover,
ablation of AM in EC revealed increased vascular permeability in comparison with
wild type (WT) littermates. In addition, AM(EC-KO) lungs exhibited significantly
less tumor growth than littermate WT mice using a syngeneic model of metastasis.
Furthermore, following middle cerebral artery permanent occlusion, there was a
significant infarct size decrease in animals lacking endothelial AM when compared
to their WT counterparts. AM is an important regulator of EC function,
angiogenesis, tumorigenesis, and brain response to ischemia. Studies of AM should
bring novel approaches to the treatment of vascular diseases.