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2015 ; 7
(5
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Intranasal Delivery of Apelin-13 Is Neuroprotective and Promotes Angiogenesis
After Ischemic Stroke in Mice
#MMPMID26391329
Chen D
; Lee J
; Gu X
; Wei L
; Yu SP
ASN Neuro
2015[Sep]; 7
(5
): ä PMID26391329
show ga
Apelin is a peptide originally isolated from bovine stomach tissue extracts and
identified as an endogenous ligand of the APJ receptor; recent work showed that
apelin ameliorates the ischemic injury in the heart and the brain. Being an
analogue to the angiotensin II receptor, the apelin/APJ signaling may mediate
angiogenesis process. We explored the noninvasive intranasal brain delivery
method and investigated therapeutic effects of apelin-13 in a focal ischemic
stroke model of mice. Intranasal administration of apelin-13 (4?mg/kg) was given
30?min after the onset of stroke and repeated once daily. Three days after
stroke, mice received apelin-13 had significantly reduced infarct volume and less
neuronal death in the penumbra. Western blot analyses showed upregulated levels
of apelin, apelin receptor APLNR, and Bcl-2 and decreased caspase-3 activation in
the apelin-13-treated brain. The proinflammatory cytokines tumor necrosis
factor-alpha, interleukin-1?, and chemokine monocyte chemoattractant protein-1
mRNA increased in the ischemic brain, which were significantly attenuated by
apelin-13. Apelin-13 remarkably reduced microglia recruitment and activation in
the penumbra according to morphological features of Iba-1-positive cells 3 days
after ischemia. Apelin-13 significantly increased the expression of angiogenic
factor vascular endothelial growth factor and matrix metalloproteinase-9 14 days
after stroke. Angiogenesis illustrated by collagen
IV?+?/5-bromo-2'-deoxyuridin?+?colabeled cells was significantly increased by the
apelin-13 treatment 21 days after stroke. Finally, apelin-13 promoted the local
cerebral blood flow restoration and long-term functional recovery. This study
demonstrates a noninvasive intranasal delivery of apelin-13 after stroke,
suggesting that the reduced inflammatory activities, decreased cell death, and
increased angiogenesis contribute to the therapeutic benefits of apelin-13.