Concluding remarks
The presence of NPY receptors on both endothelial and vascular smooth muscle cells indicates that blood-borne NPY as well as NPY stemming from surrounding nerves can affect contractile responses of cerebral vessels. In addition, endothelial cells may themselves be a source of NPY as well as a site of NPY metabolism. Understanding the roles of NPY in cerebrovascular regulation is complicated by multiple receptor subtypes, signalling pathways and cellular responses. Vasodilatory effects and vascular remodeling actions underscore the fact that NPY cannot just be classified as a potent vasoconstrictor. NPY is an important sympathetic transmitter, but it clearly acts via intracerebral nerves as well to regulate local CBF.
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Edvinsson, L. (2006). Neuropeptide Y and the cerebral circulation. In: Zukowska, Z., Feuerstein, G.Z. (eds) NPY Family of Peptides in Neurobiology, Cardiovascular and Metabolic Disorders: from Genes to Therapeutics. Experientia Supplementum, vol 95. Birkhäuser Basel. https://doi.org/10.1007/3-7643-7417-9_7
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