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2015 ; 21
(9
): 1028-1037
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Nogo-B regulates endothelial sphingolipid homeostasis to control vascular
function and blood pressure
#MMPMID26301690
Cantalupo A
; Zhang Y
; Kothiya M
; Galvani S
; Obinata H
; Bucci M
; Giordano FJ
; Jiang XC
; Hla T
; Di Lorenzo A
Nat Med
2015[Sep]; 21
(9
): 1028-1037
PMID26301690
show ga
Endothelial dysfunction is a critical factor in many cardiovascular diseases,
including hypertension. Although lipid signaling has been implicated in
endothelial dysfunction and cardiovascular disease, specific molecular mechanisms
are poorly understood. Here we report that Nogo-B, a membrane protein of the
endoplasmic reticulum, regulates endothelial sphingolipid biosynthesis with
direct effects on vascular function and blood pressure. Nogo-B inhibits serine
palmitoyltransferase, the rate-limiting enzyme of the de novo sphingolipid
biosynthetic pathway, thereby controlling production of endothelial sphingosine
1-phosphate and autocrine, G protein-coupled receptor-dependent signaling by this
metabolite. Mice lacking Nogo-B either systemically or specifically in
endothelial cells are hypotensive, resistant to angiotensin II-induced
hypertension and have preserved endothelial function and nitric oxide release. In
mice that lack Nogo-B, pharmacological inhibition of serine palmitoyltransferase
with myriocin reinstates endothelial dysfunction and angiotensin II-induced
hypertension. Our study identifies Nogo-B as a key inhibitor of local
sphingolipid synthesis and shows that autocrine sphingolipid signaling within the
endothelium is critical for vascular function and blood pressure homeostasis.