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• W1999281703 abstract "The presence and distribution of peptide-containing nerve fibres and axon terminals have been studied in the proximal part of the superior mesenteric artery (SMA) (i.e. conductance vessel) and in the finer ramifications of the SMA close to the intestine (outer diameter 200 μm, i.e. resistance vessel). Light microscopic immunocytochemistry revealed that the proximal part of the SMA possessed a rich supply of neuropeptide Y (NPY)- and tyrosine hydroxylase (TH)-immunoreactive nerve fibres, forming a loose perivascular network which increased in density distally. The vasoactive intestinal peptide (VIP) immunoreactivity was moderate in the proximal artery and only a few VIP fibres could be identified in the distal portion of the SMA. Calcitonin gene-related peptide (CGRP)-, neurokinin (NK)- and substance P (SP)-immunoreactive fibres had an intermediate density in both arterial regions, but their distribution pattern varied. Electron microscopic immunocytochemistry showed that NPY-immunoreactive nerve terminals were close to the smooth muscle cells of the medial layer in both parts of the SMA, indicative of a vasomotor role. Although the VIP-immunoreactive terminals had a similar localization they were seen less frequently. CGRP-, NK- and SP-immunoreactive axons had an identical distribution in the two vascular regions. Interestingly, they were usually seen more distant from the medial layer, localized in the adventitia. Examination of vasomotor responses to perivascular peptides revealed significant regional differences: NPY produced only weak contractions (13 ± 3%) of proximal vessel segment of the conductance type, while strong concentration-dependent contractions were seen in distal parts of the SMA (resistance vessel). In neither region was any interaction with noradrenaline demonstrated. Proximal segments of the SMA revealed a stronger and more potent response to VIP and peptide histidine isoleucine than did distal segments, while on the other hand acetylcholine was more potent and elicited stronger effects in distal segments. CGRP, NKA and SP relaxed precontracted arteries by 50–75% and there was no significant difference in responsiveness to these peptides in the two regions of the SMA." @default.
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• W1999281703 date "1989-11-01" @default.
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• W1999281703 title "Comparison of peptidergic mechanisms in different parts of the guinea pig superior mesenteric artery: immunocytochemistry at the light and ultrastructural levels and responses in vitro of large and small arteries" @default.
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• W1999281703 doi "https://doi.org/10.1016/0165-1838(89)90087-8" @default.
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